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PROCEEDINGS

OF THE

ROYAL SOCIETY OF LONDON.

From November 19, 1885, to December 17, 1885.

VOL. XXXIX.

OF CO;
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LONDON:

HARRISON AND SONS, ST. MARTIN’S LANE,
Printers in Ordinary to Her Wajesty.
MDCCCLXKXXVI.

LONDON ;
HARRISON AND SONS, PRINTERS IN ORDINARY TO HER MAJESTY,
ST. MARTIN’S LANE.

CON TE NPS.

VOL. XXXIX.

No. 239.
; ; Page
On the Atomic Weight of Glucinum (Beryllium). Second Paper. By T.
S. Humpidge, Ph.D., B.Sc., Professor of Chemistr y in the University

College of Wales, Aberystwith ... SACRA Ao: Ln RCS Ain BNR Ne saatne Hg) |
On Certain Definite Integrals. No. 13. By W. H. L. Russell, A.B.,

BAN ra eR ee SNe i ascot acto des cto guecaveccnnsuissed be SubeER de Soest Weeds ob LUG dcdaeh dads 20
On Certain Definite Integrals. No. 14. By W. H. L. Russell, A.B.,

Ie a ee asta ad de sean of Sughd sated nse cen cbuneseasebn eat 22

The Vortex Ring Theory of Gases. On the Law of the Distribution of
Energy among the Molecules. By J. J. Thomson, M.A, F.RS.,
Fellow of Trinity College, Cavendish Professor of Experimental Physics

Memnmeemmavarstiy Of Cam brid SC.......ccciecscstcacssceSoucsascacccesonseea-dasceperdersecsteobione 23
The History of the Kew Observatory. By Robert Henry Scott, M.A.,
F-.R.S., Secretary to the Meteorological Council 00.0... oes ecsseeesesceeceeeeens 37

On the Microscopic Characters of some Specimens of Devitrified Glass ;
with Notes on certain analogous Structures in Rocks. By Douglas
PEP sreetn at at Oh VE eu PUR PUL LLE «22.5 boca cccdoca ge sccsoneehe dius caetia soceestepQacteimadh’y“ansSeanshes 87

Tue BaAxeriaAn Leoture—On the Corona of the Sun. By William
ree re Nae Be a ceo cece ca cncete Bos ce set Recent cageé seed adeeseb nse nasee pace neces 108

Results of the Harmonic Analysis of Tidal Observations. By A. W.
Baird, Major R.E., and G. H. Darwin, F.R.S., Fellow of Trinity College
and Plumian Professor in the University of Cambridge ..........cceceeceee 135

No. 240.—November 19, 1885.

On the Total Solar Eclipse of September 9, 1885 (in a Letter to Professor
Stokes, Sec. R.S.). By James Hector, M.D., F.R.S., Director of the
Ce COMOOTEA EVEN GING AIC QUATRE 5) 2a. cee “sscsess cunsceciyecohcesadiledie sate sesqucvb saccades 208 -

On the Total Solar Eclipse of September 9, 1885 (in a Letter to J. N.
iroglevers BEG Sis bays Ag Se AMG OM es ide seas ceeds hvevececnnade endeupanceseboss 211

IV
Page
Report on a Series of Specimens of the Deposits of the Nile Delta,
obtained by the recent Boring Operations. By J. W. J udd, F.R.S.,
Sec. G.S., Professor of Geology in the Normal School of Mines. Com-
municated by desire of the Delta Committee ......... ...scccescseceenceeesstecneneees 213

On Evaporation and Dissociation. Part I. By Professor William
Ramsay, Ph.D., and Sydney Young, D.Sc., Lecturer and Demonstrator
of Chemistry 1 in University College, Br istol 6s a avant acest eee 228

On the Phenomena accompanying Stimulation of the Gland-Cells in the
Tentacles of Drosera dichotoma. By William Gardiner, M.A., Fellow
of Clare College, Cambridge, Demonstrator of Botany in the Uni-
ICUSILY: vs socct ace chaccvscesnarthassscepbtesevs ss’ sas osnSereleas apeelsic alse nes OiGerinc' sateen aan 229

On Variations in the Amount and Distribution of Fat in the Liver-Cells
of the Frog. By J. N. Langley, M.A., F.R.S., Lecturer on Histology
im the University of Cambridge .:........c cise ticsecsossossesnseonsnenst eed eee 234

November 26, 1885.

On the Fertilised Ovum and Formation of the Layers of the South
African Peripatus. By Adam Sedgwick, M.A., Fellow of Trinity
Wollege, Cam bridge’ 225.58 isiive.ce-se Bec dgescenentt sn eathcnyiseactee ec, «sp eee 239

On the Formation of the Mesoblast, and the Persistence of the Blasto-
pore in the Lamprey. By Arthur E. Shipley, B.A. .......csceeeeeee 244

Researches on Myohzematin and the MHistohematins. By C. A.
Mae inn, MLAs, VED 8. scdsissebacsscdecioenensnabecdedeennenen trae aee eee arr 248

On the Geometrical Construction of the Cell of the Honey Bee. By
Henry Hennessy, F.R.S., Professor of Mathematics in the Royal
College of Science, 253

Results deduced from the Measures of Terrestrial Magnetic Force in the
Horizontal Plane at the Royal Observatory, Greenwich, from 1841 to
1876. By Sir G. B. Airy, K.C.B., F.R.S., late Astronomer Royal ........ 25D

Studies of Disinfectants by New Methods. By A. Wynter Blyth,

Miedical’ Officer of Health) ...s.iclodiccsoles enctesoidie eecteecesass ce 259
November 30, 1885.
ANNIVERSARY MEETING.
HLEPOLE OL AWGILOLS iiss. cse.meeecowas degssctorsacshicsnantiy eaeteeisiolossssich 277
List of Fellows deceased since last Anniversary .........cccccssssssssscecesescscsecececere 277
ClECHEM EL e dei hnceote Masten mindhons de ee 278
INGOTESSIOL the EVEStdeMib. 5. cscccicsissecctendbo ee ce 278
Presentation of the Medals io. cccccc)scssececvdedeccsesssaliatedisterdiien toca 299-
Riection-of Council and Officers... j.. ihe. iebveiessoscseoisdicdelicchicseuncuc 301

Table showing Progress and ey State of Society with regard to
RUS THONVS aren susshscsee-neseaaneyotsivese-roereadisthestegs teversskebsenss leBevks Suds ateceon ee 301

AY

; Page
SME TENINENE MSNA TE TIMER U wis, seesctuceteac ce ieahaecd ooo ececdoluadcbuiae Resiecbeoutsasscaceeres a te 302——-305
OR aries BN ee ee Mobs ct abcess esa cundsqseiacoaehtvaldaricnlensoiavtiboebeksessfedayenesen +400. 306—309

Account of the Appropriation of the sum of £4,000 (the Government
Grant) annually voted by Parliament to the Royal Society, to be

employed in aiding the Advancement Of Science... cece sence eeeeeeee cane 310
Aeeoume ol Grants trom the Donation Fund oo... c.sccseceenteoee sosceeeeeeacoeneeee 313
Fre OMRON CC OUMIMNTELEE O.5)5:.n0 cece are.esacere(cscnseseoesoueeseeen jecnasessenaiveotvas seshiness 314
Tobsts, Git, IPSS TGS. cat bade das eee ai a De cs ep EPO 339
Contributions to the Chemistry of Chlorophyll. By Edward Schunck,

JERS cneie eon sos 12 6 no geB DUR PREL REES MI MRE ACG EE SHE i IRB creme MSU iat 348

No. 241.—December 10, 1885.

Preliminary Results of a Comparison of certain simultaneous Fluctuations .
of the Declination at Kew and at Stonyhurst during the Years 1883 and
1884, as recorded by the Magnetographs at these Observatories. By
the Rev. Stephen Joseph Perry, F.R.S., Director of the Stonyhurst
Observatory, and Balfour Stewart, LL.D., ER. S., Professor of Physics
at the Owens College, Wiamchectene he ee se 362

On the Magnetisation of Steel, Cast Iron, and Soft Iron (being the
Investigation for which the Watt Prize of 1884 was awarded by the
Senate of the University of Glasgow). By John W. Gemmell ............ 374

On the Limited Hydration of Ammonium Carbamate. By H. J. H.
Fenton, M.A., F.C.S., F.1.C., Demonstrator in Chemistry in the
University of Cambridge Sere itn Oe erie tae URL Meer Ge gee gu Mere ele 386

On the Relation of the Reptiliferous Sandstone of Elgin to the ves
Old Red Sandstone. By Professor John W. Judd, ER. S., Sec. G.S..... 394

Experimental Researches in Cerebral Physiology. II. On the Muscular
Contractions which are evoked by Excitation of the Motor Tract. By
V. A. Horsley, M.B., B.S., Professor Superintendent of the Brown
Institution and Assistant Professor of Pathology in University College,
London, and EH. A. Schafer, F.R.S., Jodrell Professor of Physiology in
“ead seer IBS (CONN sais 10) SAO ee ve a PA Oa Ra 404

December 17, 1885.

An Experimental Investigation into the Form of the Wave Surface of
PiiaeaaeeneiammesvO: NicConmel) Bea oie ec sscscccssesdccsleceesllbsseeosoee 409

Becond Report on the Evidence of Fossil Plants regarding the Age
of the Tertiary Basalts of the North-East Atlantic. By “J. Starkie
7 EAL a 28 cacy ogee oe AA GORDIE GH A CO ETO Pap i 412

hddition to a former Paper on Trichophyton tonsurans (‘‘ Proc. Roy.
Biewe VO: co. pn 2et a by Georme: Voit, MD cu vib elses deccesecces sats 415

Mm New Form of Spectroscope. By J. Norman Lockyer, F.R.S............... 416

vi
Page
On the Formation of Vortex Rings by Drops Falling into Liquids, and
some allied Phenomena. By J. J. Thomson, M.A., F.R.S., Fellow of
Trinity College, Cavendish Professor of Experimental Physics, Cam-
bridge, and H. F. Newall, M.A., Trinity College, Cambridge ................ 417

A Preliminary Account of a Research into the Nature of the Venom of
the Indian Cobra (Waja tripudians). By R. Norris Wolfenden, M.D.
Cantab. (from the Physiological Laboratory, University College,
MRO INGON Fos. 25. huss can ces tan ei yoeas de de Deis llecioesattenatnelals suapetegee 5.0 et. 436

ies aN BOSOUS 0. pte cet cies cease ezeove isos: eiek posean niaee. tor ease anya ee .. 436
The Influence of Bodily Labour upon the Discharge of Nitrogen. By
We! North! B. As, WiC 38 ie) secs. spear nai sabes steve <to8 voas onsets 443
The Influence of Stress and Strain on the Physical Properties of Matter.
Part II. Electrical Conductivity (continued). The Alteration of the
Electrical Conductivity of Cobalt, Magnesium, Steel, and Platinum-
iridium by Longitudinal Traction. By Herbert Tomlinson, B.A. ........ 503

Tamia ye ess oven os olive bueeest ews dere oema chiouslouedbenbnal auoeceeee ts casi 1a 533 .

Title and Contents.

Obituary’ Notices :—
fenry Charles Pleemins’ Jenkwi* 2 i eA na eee iho etapa 1
BG. Ce ones casa eee gnnn gees ccpgsesennalanbiices cles seiscon: ei oru (ope

“Thomas Davidscn.......... yajia sued ss-vnain sobswenacens sldcsepuneie tet sacle ea Vill

ete EO aD PO Ie See

OBITUARY NOTICES OF FELLOWS DECEASED.

Amongst the men who have laboured earnestly and successfully to
place on a sound scientific basis the practice of engineering, the late
accomplished occupant of the Chair of Engineering at the University
of Edinburgh, Henry Cuarites FLEeminc JENKIN, will hold a dis-
tinguished place. Born in Kent on the 25th March, 1833, the only
son of Captain Charles Jenkin, R.N., he was sent to school in
Scotland at the early age of seven years, where, under Dr. Burnett, of
Jedburgh, for three years, and after that for three years in the Edin-
burgh Academy, the first six years of his school lfe were spent. In
1846 he was placed at a school in Frankfort; in 1847 he was for a
time in Paris; and, finally, in 1850, he Saauated as a Master of Arts
at the Meerarsity of Genoa.

He began his training as an engineer in a locomotive Vartabes at
Genoa, under Philip Raglan of Marseilles, where he remained for
about a year. He returned to England in 1851, and served a three
years’ apprenticeship in the works of the Fairbairns, of Manchester.
After a varied experience of practical work, Mr. Jenkin, in 1857,
entered the service of Messrs. Newall, in their submarine cable
factory at Birkenhead, where they were then engaged in the manufac-
ture of a part of the first Atlantic cable, and afterwards of cables for
the Mediterranean and the Red Sea. His energy and talents very
soon obtained for him the position of chief of the engineering and
electrical staff. In this connexion Jenkin was brought into close
relation with the able engineers and electricians who were then work-
ing out to a practical result the great problem of submarine tele-
graphy. These circumstances determined the direction in which his
energies were more especially to be applied, and he became early
known as an electrical engineer of high standing.

At the beginning of 1859 he became known to Sir William
Thomson, and entered into constant correspondence with him in con-
nexion with the testing of conduetivity and insulation of submarine
cables, and the speed of signalling through them. After Faraday’s
discovery of the existence of specific mductive capacity, and his now
celebrated, though then ignored, determinations of it for flint glass,
shell-lac, and ee the first correct determination of the specific
inductive capacity of any substance was made by Jenkin by means
of observations arranged for the purpose on some of the submarine
cables in the factory at Birkenhead.

b

25
li

In 1861 Mr. Jenkin joined Mr. H. C. Ford as partner, and with
him for seven years he carried on an extensive practice in telegraphic
and general engineering. During the last two years of this partner-
ship Jenkin held the post of Professor of Engineering at University
College, London, and in 1868 the partnership was dissolved on account
of his appointment to fill the Chair of Engineering in the University
of Edinburgh, which he occupied till his death, teaching with much
SUCCESS.

In 1859 he began to write upon scientific subjects, encouraged
to do so, as he has himself remarked, by Sir William Thomson. His
published papers are in all about forty in number. Of these a large
proportion deal with questions arising from the science and practice
of submarine electrical engineering, and were published within the
ten years 1859 to 1869—a period of the greatest progress in submarine
telegraphy.

Professor Fleeming Jenkin took a very important part in the work
of the British Association Committee on LHiectrical Standards,
appointed on the suggestion of Sir William Thomson at the Man-
chester meeting of 1861, for the purpose of promoting the practical

-use of Gauss and Weber’s system of absolute measurement, by which
lasting benefit has been conferred on electric and magnetic science.
Jenkin was made Secretary of this Committee; and, in conjunction
with Professor Clerk Maxwell, carried out the most important of the
experiments instituted by the Committee.

Through having been so intimately concerned in the beginnings of
ocean telegraphy, Jenkin became associated with Sir William Thomson
and Mr. C. F. Varley in the development of the instruments by which
the transmission of messages over long submarine cables was for the
first time made practicable. During later years he and Sir William
Thomson acted as joint engineers for various cable companies, their
latest work in that capacity being the Atlantic and other cables of the
Commercial Cable Company.

For the last two years he was much occupied with a new mode of
electric locomotion, a very remarkable invention of his own, to which
he gave the name of ‘“Telpherage.” He persevered with endless
ingenuity in carrying out the numerous and difficult mechanical
arrangements essential to the project, up to the very last days of his
work in life. He had completed almost every detail of the realisa-
tion of the system which was recently opened for practical working
at Glynde, in Sussex, four months after his death.

His book on ‘“ Magnetism and Electricity,” published as one of
Longman’s elementary series in 1873, marked a new departure in the
exposition of electricity, as the first text-book containing a systematic
application of the quantitative methods inaugurated by the British
Association Committee on Electrical Standards. In 1883 the seventh

1

edition was published, after there had already appeared two foreign
editions, one in Italian and the other in German.

His papers on purely engineering subjects, though not numerous,
are interesting and valuable. Amongst these may be mentioned the
article “ Bridges,” written by him for the ninth edition of the “ Hn-
cyclopedia Britannica,’ and afterwards republished as a separate
treatise in 1876; and a paper ‘‘On the Practical Application of
Reciprocal Figures to the Calculation of Strains in Framework,” read
before the Royal Society of Edinburgh, and published in the “ Trans-
actions” of that Society in 1869. But perhaps the most important of all
is his paper “On the Application of Graphic Methods to the Determi-
nation of the Efficiency of Machinery,” read before the Royal Society
of Edinburgh, and published in the ‘“‘ Transactions,” vol. xxviii (1876-
78), for which he was awarded the Keith Gold Medal. This paper
was a continuation of the subject treated in “ Reulaux’s Mechanism,”
and, recognising the value of that work, supplied the elements re-
quired to constitute from Reulaux’s kinematic system a full machine
receiving energy and doing work, |

Professor Jenkin’s activity was not, however, confined to purely
scientific pursuits. The very important practical subject of healthy
houses largely engaged his attention during the last eight or ten years
of his life, and he succeeded so well in impressing its importance on
public opinion, that he obtained the establishment in many large
towns of Sanitary Protection Associations, He also took great interest
in technical education, and was always ready in word and deed to
aid in its promotion. His literary abilities were of no mean order,
and as a critic he made several marked successes, among which his
reviews of Darwin’s ‘‘ Origin of Species ”’ and of Munro’s “ Lucretius”’
(the atomic theory) may be referred to as of high scientific merit.

He was elected a Fellow of this Society in 1865; he was also a
Vice-President of the Royal Society of Edinburgh, a Member of the
Institution of Civil Engineers, and of the Institution of Mechanical
Engineers, and in 1883 he received the honorary degree of LL.D from
the University of Glasgow. He died on the 12th of June, 1885, after
a few days’ illness, due to a slight surgical operation, Week:

F. G. J. Henuz. Of the great anatomists and physiologists whose
discoveries made the middle of the present century a never-to-be-
forgotten epoch in the history of biology, one of the greatest died
on the 13th of last May at Gottingen. Frederick Gustavus Jacob
Henle was, in the earlier years of his career, the most distinguished
of living pathologists, and, indeed, founded the Science of Pathology
as we now understand it. The ‘Manual of Rational Pathology,”
published in 1846, was the first important work in which the observed
clinical and anatomical facts of disease were classified and brought

1V

together into a system, based on their physiological relations. He had
already prepared the way for his reform of Pathology by his larger
work on General Anatomy, in which he, for the first time, distin-
guished the tissues which make up the framework of the body from
each other, according to their chemical and anatomical characters,
availing himself, as regards the latter, of the new light which the
discoveries of Schwann had thrown upon the nature of animal and
plant organisation, and of the methods of investigation rendered pos-
sible by the sudden advance which had taken place in the construc-
tion of the microscope.

As a pathologist, Henle soon relinquished the lead he had at first
taken to Virchow, who, by his personal work or by that of his
pupils, has since retained it. As years went on, Henle became more
and more a descriptive anatomist and histologist. The publication of
the greatest work of his incredibly laborious life, the ‘“ Handbuch der
Systematischen Anatomie des Menschen,” began in 1855. In it the
student was furnished with an anatomical description of the human
body, which, at the time, surpassed all others—not even excepting
Dr. Sharpey’s edition of Quain’s Anatomy—in the quantity of infor-
mation, new and old, it contained, in the abundance and excellence of
the illustrations; and it was not less remarkable for the clearness of
the author’s style, and the power which he possessed of so presenting
the forms and anatomical relations of the organs or parts described,
as to leave behind a vivid picture in the imagination of the reader—
for Henle’s descriptions are so real and true to nature, that in reading
them one seems to have seen what is described.

Any one of the three great works which have been mentioned would -

have been sufficient to entitle its author to a permanent position
among the founders of modern medical science. Taken together they
afford good ground for assigning to Henle a place scarcely inferior to
that of his master, Johannes Miller, or of his contemporary, Theodore
Schwann.

Henle began his career as an anatomical investigator by spending
the year which intervened between his examination for the doctorate
and the taking of his degree in the preparation of his thesis on the
Anatomy of the Hye, and in other anatomical researches, of which
the fruits appeared later, and which he undertook, under the direc-
tion and with the co-operation of J. Miller, who was still at Bonn.
When Miller, a year later, was called to the University of Berlin,
Henle became his Prosector. He held this office for six years, during
which he was associated with Miller in his multifarious professorial
duties; these comprising, according to the custom of the time, not
only the teaching of anatomy and physiology, but also pathology and
pathological anatomy. It was for Henle a time of extraordinary
activity. During his tenure of this Prosectorship he published three

Vv

anatomical monographs on previously undescribed species of animals
(Narcine, Bronchiobdella, Hnchytroeus), one or two contributions to
descriptive human anatomy, and (in addition to the Latin dissertation
already referred to) four of those investigations into the minute struc-
ture of the animal body, which afford the best justification for
placing him, as we have done, side by side with Theodore Schwann,
as one of the founders of the Science of Histology—namely, the Essay
on the Structure of the Lacteal System, which served for his ‘“ Habi-
litation”’ Thesis, and three other papers on the Distribution of the
Hpithelium in the Human Body, on the Formation of Mucus and Pus,
and on the Structure and Development of Human Hair.

In 1840, when Henle was thirty years old, he received a call to the
Chair of Anatomy at Ztirich, where he remained until, in 1844, he
became the colleague of Tiedemann, at Heidelberg. The year after ©
his Ztirich appointment he published his “‘ General Anatomy,” already
referred to; and about the same time, in co-operation with Professor
J. Miiller, he published a zoological work on Sharks and Rays, for
which the collection of the British Museum afforded part, at all
events, of the material.

In Heidelberg, Henle, like Miller, taught both anatomy and physi-
ology, as well as pathology. Almost immediately after his settlement
in that university, he began with Pfeiffer, who had accompanied him
from Zurich, the “ Zeitschrift ftir rationelle Medicin,” which, after
sharing the first place with “ Virchow’s Archiv” in medical periodical
literature for a quarter of a century, gave place to the new order in
1872. During the last sixteen years of its existence the Journal was
enriched by the publication in it of Henle’s own annual account of
the progress of anatomical and physiological science—a fact which,
irrespectively of its other contents, will give its fifty-four volumes a
permanent place in medical literature. As all who were then engaged
in the study of biology know, Henle’s ‘‘ Berichte” had no analogy to
the half reliable and unappreciative abstracts which the enormous
growth of periodical literature have now made a necessary evil. They
consisted rather of records by a master hand of all that was worthy
of being remembered, and critical reviews of all that was worthy of
being discussed in its bearing on the development of the branches of
science to which they related. So that whoever undertakes the Her-
culean task of writing the history of that time of rapid progress in
biology which began about the time of Henle’s removal from Berlin to
Zurich, will find the chief events of those thirty years continuously
chronicled (first in ‘ Miller’s Archiv,’ then in “ Canstalt’s Jahres-
berichte,” and finally, as above stated, in the “ Zeitschrift”) by one
who himself took a prominent part in them.

In 1852 Henle was called from Heidelberg to Gottingen, and it was
here that the chief work of his life, the preparation of the Descriptive

V1

Anatomy, was accomplished. It resembles the contemporary edition
of Quair and Sharpey in including both general and special anatomy,
and in vue way in which the illustrations are interwoven with the
text; but exceeded it in their number and quantity. To the most
dificult part of descriptive anatomy, that which relates to the central
organs of the nervous system and to the viscera, Henle devoted many
years of labour, and produced a result which had never before been
approached, The magnum opus was brought to a conclusion in 1873,
but inasmuch as by the time the first editiou was completed, the third
was already in progress, it continued to the end to be an increasing
occupation, the labour of which was further enhanced by the obliga-
tion to which the requirements of medical education forced upon him,
of publishing a text-book and copious atlas for students—a com-
pendium of the larger work.

The “ Handbook” did not of course profess to contain a record of
researches. It was in its end and construction a system. But during
the whole course of its publication, the author was continuously
engaged in the work of investigation. The research on the anatomy
of the kidneys, in connexion with which subject his name is most
familiar to English students of medicine, appeared in 1862 in the
Transactions of the Gottingen Academy; those on the histology of
the central nervous system in 1867-68. More recently he published
two important researches on his old subject, the minute anatomy of
the eye (1878 and 1882); and finally in November, 1884, his last
anatomical research, ‘‘ Das Wachsthum des Menschlichen Nagel und
des Pferdehufes.”’

To judge of Henle as a pathologist, reference must be made to his
systematic work on that subject already mentioned, the fundamental
idea of which is, that disease consists essentially in the reaction of
the living material against “abnormal external action,” and that the —
nature of this reaction differs in no respect, excepting the circum-
stances under which it is evoked or induced, from those which exhibit
themselves in the healthy body in its relation to its normal enyiron-
ment, so that, as Henle expressed it, “ physiology and pathology are
branches of the same science.” The notion expressed in these words,
incontrovertible as it may appear now, was opposed to the teaching
of the time, which in physiology preferred to inquire into the purpose
rather than the cause of vital phenomena, and resented as a desecra-
tion every attempt to refer them to chemical or physical actions; and
in pathology spoke of diseases as if they were mischievous personalities
whose intentions it was the business of the physician to aid the
‘““Schiitzender Geist” in discovering and frustrating. Against all
such notions Henle made uncompromising war, by showing even
with the imperfect knowledge and means possessed in 1840, that it
was possible to discover the causes of many diseases, not in intestine

Vil

strivings hetween rival destructive and preservative tendencies sup-
posed to be resident in the hody itself, but in the existena in its
environment of elements injurious to its welfare. ™

At an earlier period, the absence of physical and chemical know-
ledge would have rendered the success of any such attempt impossible.
As it was it was imperfect, and was recognised as such by its author ;
but it was so unquestionably the beginning of that rapid development,
by which, under the influence of Virchow and his pupils, what we
now recognise as the science of pathology has come into existence,
that of this science Henle must be regarded as the founder.

In certain directions, indeed, Henle was in advance of his successors.
If, for example, we take the opening chapter of the “ Untersuchungen,”’
which deals with the etiology. of contagious diseases, we find in it a
most remarkable anticipation of the discoveries in this field of inquiry
of the last fifteen years. He sets forth in the clearest language that
the material of contagium must necessarily be not only organic but
living and organised, and that it must consist of “ parasitical beings
which are certainly among the Jowliest, smallest, but at the same
time most productive which are known.”

The consideration of the reasoning which led Henle to this con-
clusion, affords a striking illustration of the way in which discoveries
made in other departments of natural science influence medicine.
Henle’s grounds were* (1) the evidence of experiments that contagion
acts in infinitesimal quantities, and must therefore be self-multiplying ,
(2) the proof then shortly before given by Schwann that the analogous
processes of fermentation and putretaction are dependent on minute
organisms; (3) the proof recently given by Bassett Audouin that the
muscardin of silkworms, a disease communicable through the air,
was due to a contagium vivum ; and finally (4), the consideration that
the development of contagious diseases could be best explained by
attributing them to a living cause.

That Henle did not himself follow these indications may probably
be attributed to his being engrossed by other researches. It seems at
first sight difficult to account for the fact that the seed sown by him
did not fructify in the minds of some of his readers; for when in
1868 the investigations of Chauveau again brought the subject of
contagium vivum to the front, it was approached from an entirely
different point of view.

A sketch must be given, in conclusion, of the views which Henle
entertained and taught as to the psychological side of biology.
Mention has already been made of his having lectured at Heidelberg
on anthropology. These lectures were given to a mixed academical

* See his “Pathologische Untersuchungen,” Berlin, 1840, pp. 17—20, and
36—41. The publication of this work was preparatory to that of the “ Rationelle

Pathologie.”
C

Vill

audience in 1847-52, and published thirty years afterwards under
the title of “Anthropologische Vortrage.’ That they dealt with
subjects very far apart from what we now understand by anthro-
pology may be gathered from the titles—Faith and Materialism ;
Taste and Conscience; The Physiology of Emotion; The Will;
Teleology and Darwinism; Medical and Religious Dualism; &c.
Among the most interesting are the two last enumerated. Like
many other biologists of the former generation, Henle, while cordially
accepting the doctrine of descent, strenuously opposed the monistic
view, which in the minds of most persons is associated with it, and
which refuses to find anything in the phenomena of life which cannot
be accounted for as resulting from the play of the molecular forces of
the chemical elements which take part in them. He regarded the
organism, whether plant or animal, not as the inevitable product of
the conditions under which it originated and was developed, but as
having independent powers of its own, which the environment is
capable of modifying or even controlling, but not of originating. The
_ constancy as well as the variability of organic structure, he said, are
alike manifestations of the existence of an agent attached to matter,
but not material, and endowed with the function of “ presiding over
the metabolism of the body capable of reproducing the typical form,
and of endless partition without diminution of intensity,” in a way
which has no counterpart in the inorganic world. It is this infinity
of the faculty which the organism possesses of ‘‘ making the material
which composes it its own, and impressing upon it its stamp,” which
separates it from the recognised forces of inorganic nature. Every
kind of organism has its ‘‘réumliches” as well as its “ zeitliches
Ziel,’’** which serves as the law of its existence, and the fulfilment of |
which in no way interferes with its taking its legitimate part in the
order of nature. | J. Bes:

THomas Davipson, LL.D., whose death took place at his residence
in Brighton on Wednesday, October 14th, was born in Edinburgh,
May 17th, 1817; his ancestral home being at Muir House, near
Edinburgh. Mr. Davidson’s family possessed considerable landed
property in the county of Midlothian.

At the early age of six years he was taken to the Continent and
entirely educated in France, Italy, and Switzerland under the tuition
of French and Italian masters. Even at eleven years of age he
exhibited a marked predilection for natural history, as well as the
fine arts, especially painting, and every facility was afforded him to
secure the great advantage which Paris then offered to the artistic
and scientific student.

* “Teleologie und Darwinismus,” p. 92.

1X

Young Mr. Davidson attended the courses of lectures delivered at the
Sorbonne, Jardin des Plants, Ecole des Mines, and Collége de France.
These courses were given by Cordier, Hlie de Beaumont, Constant
Prevost, Dufrenoy, Geoffroy Saint Hilaire, Dumeril, Valenceinnes,
de Blainville, Milne Edwards, Audouin, Brongniart, Pouillet, &c.

In 1832 Sir Charles Lyell’s “Principles of Geology,” and his
intimacy with Constant Prevost, led him to give much attention to
geology and paleontology, and at fifteen years of age he had already,
under the guidance of Prevost, explored the greater part of the Paris
basin, securing a good collection of its rocks and typical fossils.

In 1835 he matriculated at the University of Edinburgh, studied
mineralogy under Professor Jamieson, chemistry under Dr. Reid, and
assisted Mr. R. Cunningham in his geological survey of the Lothians.

In 1836 he returned to the Continent and explored a considerable
portion of France, Belgium, Switzerland, Germany, and Italy; his
acquaintance in 1837 with the distinguished Prussian geologist, Von
Buch, led to his undertaking the special study of the then little
understood recent and fossil Brachiopoda, the elaboration of which
or any other group of Mollusca has never been surpassed ; the elucida-
* tion of their characters, classification, and history, as well as of their
geological and geographical distribution, being now complete through
his labours. From that year up to a short period prior to his death,
Mr. Davidson unceasingly laboured to advance this special branch of
Paleontology.

For some years Mr. Davidson was an attentive and distinguished
pupil of Paul Delaroche, and studied under Horace Vernet and other
French Academicians at the Ecole des Beaux Arts. He spent the
winter of 1841 in Rome, devoting himself to the art of painting, but
his love for scientific research predominated, and he subsequently
brought his artistic knowledge to bear upon his favourite scientific
branch of study.

In 1846-47 Mr. Davidson made a careful examination of the
Silurian districts for the purpose of his paleontological researches,
and in 1850 he commenced that grand series of memoirs in the
“* Palzesontographical Society’s Transactions,’ which mainly terminated
in 1871 (extensive supplements following). This distinguished natu-
ralist has published or written for the Paleontographical Society five
large quarto volumes, containing nearly 3000 pages of text, and 250
plates, all the figures of which have been executed by himself and pre-
sented to the Society free of all expense, and this on one subject only.*

* The monographs extend from the year 1851 to the present time, the final
portion of the fifth volume being now in the press, and completing his great and
laborious life-work. His posthumous papers will shortly be published in the
“Transactions of the Linnean Society,” his last contribution being a complete and
finely illustrated monograph upon the “ Recent Brachiopoda,”’ in three parts.

ce

x

Mr. Davidson prepared the article Brachiopoda for the “‘ Encyclopedia
Britannica,” and has monographed the entire series of Brachiopoda
collected during the exploration of H.M. ship “ Challenger.”

Thirty years have passed since the publication of his general intro-
duction to the first volume of his extensive monographs, and well
may it be said that seldom has fortune more completely equipped a
student for his life-work than in the present case, in which more than
ordinary artistic talent, liberal education, and independent means
were joined to unsurpassed devotion in the pursuit of knowledge,
with just impartiality in the recognition of the labours of others in
the same field of research. Mr. Davidson was one of the most
unselfish of men, ready to aid all who worked and sought his advice
and opinion upon the intricacies of the intimate structure of the
Brachiopoda. Few more enthusiastic students ever enriched the
pages of scientific literature, or probably committed fewer errors in
the description and delineation of the voluminous mass of species
that enrich the 3000 pages and 250 plates left as a lasting memorial
of industry and learning. Unhappily Mr. Davidson has not lived to
see the proofs of his final monograph on the recent species of Bra-
chiopoda about to be issued by the Linnean Society.*

Beyond the monographs in the paleontographical volumes, most of
Mr. Davidson’s investigations have been published in the “ Quarterly
Journal of the Geological Society,” the “Bulletin de la Société
Géologique de France,” the “Annals and Magazine of Natural His-
tory,” the ‘‘ Geological Magazine,” “ Proceedings” of the Linnean
Society of Normandy and of the Zoological Society of London,
“Transactions ’’ of the Geological Society of Glasgow and of the
Royal Society of Liege.

In 1880 Mr. Davidson was deputed by the President and Council of
the Geological Society of London to represent the Society at the
celebration of the fiftieth Anniversary of the foundation of the French
Geological Society ; he was received in Paris with great distinction.
The Councils of the Royal Society of London, the Linnean Society,
the Zoological Society, the Royal Society of Hdinburgh, the Geological
Society of Edinburgh, the Geological Society of Glasgow, the Royal
Academy of Ireland, the Royal Geological ‘Society of Ireland, and
the Paleontological Society of London all commissioned Mr. Davidson

* Less than one-third of the known species (1000) of Brachiopoda were unknown
when Mr. Davidson published the introduction to his great work in 1850. To this
volume the late Dr. W. B. Carpenter appended an elaborate description of the
“Intimate Structure of the Shells of Brachiopoda,”’ and Sir Richard Owen a learned
contribution on the ‘‘ Anatomy of Terebratula.”” The number of British species,
which in 1850 comprised 13 genera and 450 species, have now expanded to 74
genera and 1000 species and varieties, these results being almost entirely due to the
researches of Mr. Davidson.

XI

to felicitate the Council of the Geological Society of France on its
prosperous condition on attaining its fiftieth Anniversary.

Mr. Davidson was member or honorary member of most of the dis-
tinguished societies of Hurope and America. He was elected Fellow
of the Royal Society in 1857, was Fellow of the Linnean Society,
the Geological Societies of London, France, Edinburgh, and Glasgow,
Vice-President of the Paleontographical Society, Member Etranger
de l’Institute des Provinces, France, and Linnean Society of Nor-
mandy, the Imperial Society of Naturalists of Moscow, Imperial
Mineralogical Society of St. Petersburgh, Member of the Royal
Academies of Belgium and Bavaria, Société Royale Hollandaise des
Sciences, Haarlem, Royal Society of Liége, Academy of St. Louis,
the American Philosophical Society, Philadelphia, Paleontological
Societies of Belgium and Switzerland, the Zoological Society of
Vienna, and many of the local societies of Britain.

In December, 1870, he was awarded one of the Royal medals in
recognition of his valuable contributions to paleontology.

In July, 1865, he received from the Council of the Geological
Society the Wollaston medal, its highest award for distinguished
merit.

~In 1882 the University of St. Andrews conferred on him the
honorary degree of LL.D. .

The Free Library and Museum at Brighton chiefly owed its founda-
tion and success to Mr. Davidson’s energy and perseverance. He
was permanent chairman of the Museum Committee at the time of
his death. Mr. Davidson has generously bequeathed to the nation
his magnificent and unique collection of recent and fossil Brachiopoda
largely enriched with types, together with his fine collection of books
and original drawings. These will all be preserved in the Depart-
ment of Paleontology in the British Museum of Natural History,
Cromwell Road, South Kensington. R. HE.

PROCEEDINGS OF
THE ROYAL SOCIETY,

VOL. XXXIX.

No. 239.

CONTENTS. o

te,

On the Atomic Weight of Glucinum (Beryllium).

PAGE
Second Paper.

BY
T. §. Humprtpen, Ph.D., B.Sc., Professor of Chemistry in the co
College of Wales, Ae sueych

On Certain Definite Integrals.

No.138. By W.H. L. Russeur, A.B., F.R.S
The Vortex Ring Theory of Gases

. On the Law of the Distribution of
Energy among the Molecules.

By J. J. THomson, M.A., F.R.S., Fellow
of Trinity College, Cavendish Professor of Hxperimental Physics in the
University of Cambridge

t | Let ee:
The History of the Kew Observatory. By Roprert Henry Scort, M.A.,
F.R.S., Secretary to the Meteorological Council

On the Microscopic Characters ‘of some Specimens of Devitrified Glass, with
Notes on certain analogous Structures in Rocks

By Doveias HERMAN
and FRANK RuTLEY (Plates 1-4)

‘fae Baxerian Lectore.—On the Corona of the Sun By Witr1aM
Hveains, D.C.L., LL.D., F.R.S "

108
Results of the’ Harmonic Analysis of Tidal Observations

ions. By A. W. Barrp,
Major R.H., and G. H. Darwin, F.R.S., Fellow of Trinity College and
Plumian Professor in the University of Cambridge

: He cine ‘ ai ges
Obituary Notices :—

Henry Cuaries FLErMiInG JENKIN
F. G. J. Hentz

Price Seven Shillings and Siapence.

~~

PHILOSOPHICAL TRANSACTIONS.

Part II, 1884.

CoNTENTS.
XIII. On the Dynamics of a Rigid Body in Eliiptic Space. By R.S. Hearn, B.A.

XIV. Researches on Spectrum Photography in relation to New Methods of
Quantitative Chemical Analysis. Part I]. By W. N. HArrtey,
E.R.S.E., &e.

XV. On the Transfer of Energy in the Electromagnetic Field. By J. H.
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XVI. On the Motion of Fluid, part of which is moving Rotationally and part
Irrotationally. By M. J. M. Hiuz, M.A.

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motive Force of Clark Cells. By Lord Rayurieu, D.C.L., and Mrs. H.
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XVIII. Influence of Change of Condition from the Liquid to the Solid State on

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and GERALD F. Yo, M.D., F.R.C:S.

XX. On the Comparative Morphology of the Leaf in the Vascular Cryptogams
and Gymnosperms. By F. O. Bower, M.A., F.L.S.

XXI. Conditions of Chemical Change in Gases: Hydrogen, Carbonic Oxide, and
Oxygen. By Haron B. Dixon, M.A.

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OF

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PDD WAANNANAAAAN

«On the Atomic Weight of Glucinum (Beryllium).” Second
Paper. By T. 8. Humprpe@r, Ph.D., B.Sc., Professor of
Chemistry in the University College of Wales, Aberyst-
wyth. Communicated by E. FRANKLAND, F.R.S. Received
February 27,1885. Read March 5.

In a former communication which I had the honour of making to
the Royal Society,* I described a method of preparing metallic
glucinum and of determining its specific heat. From my experiments
I deduced the result that the atomic weight of the metal must be
13°6 (circé) in order to agree with Dulong and Petit’s rule.

It is well known that the position assigned to glucinum in the
periodic arrangement of the elements requires an atomic weight of
two-thirds the above number, or approximately 9, and that with the
larger atomic weight it falls between carbon and nitrogen, and is
entirely out of place.

Various criticisms were offered to explain thisapparently anomalous
result. To the suggestion of Professor J. H. Reynolds} that
the pure metal would have a specific heat 50 per cent. greater than
that of a sample containing 6 per cent. of impurities, I have already
replied.{ Another explanation was offered by Brauner,§ who
thought it possible that the specific heat of the metal might increase
with the temperature and thus agree with Dulong and Petit’s rule, at
some higher temperature-interval than 0O—100°. Brauner’s sugges-
tion was based upon the position which glucinum should occupy in
the periodic arrangement and which would be similar to that of boron
and carbon. Some determinations of the specific heat of the metal up

* “ Phil. Trans.,”’ 1883, Part II, p. 601.
fT “ Proc. Roy. Soc.,” vol. 35, p. 248.
£ “ Proc. Roy. Soc.,”’ vol. 35, p. 358.
§ “ Berlin Ber.,” xi, 872.
VOL. XXXIX, B

2 Prof. T. 8. Humpidge.

to 300° made by Nilson and Petterson* confirmed this prediction to a
certain extent, but as thisimportant question could not be considered
as definitely decided, the following investigations were undertaken.
Owing to the small amount of time at my disposal the experiments
have absorbed the greater part of my leisure for the past fourteen
months, and in the mean time my results have been partly forestalled
by other investigators, but the importance of the subject justifies me
in publishing what is little more than a confirmation of the work of
others.

My experiments may be divided into two groups, (1) those on the
specific heat of pure glucinum at varying temperatures, and (11) those
on the vapour-density of volatile glucinum compounds.f

I. Specific Heat of Metallic Glucinum at varying Temperatures.

For the determinations of the specific heat of glucinum at varying
temperatures a fresh quantity of the metal was prepared from the
pure chloride by the method which I have previously described
(loc. cit.). The chloride was obtained from oxide which had been
carefully purified with ammonium carbonate. Hxperiments in which
impure glucina was fused with acid potassium fluoride, and the fused
mass extracted with water containing hydrofluoric acid, proved that if
iron is present much of it goes into solution with the glucinum. The
usual.method with ammonium carbonate gives better results, especi-
ally if the process is several times repeated, and if at last an insufficient
quantity of the solvent is used, so that some of the glucina remains
undissolved with the last traces of the alumina. The concentrated '
solution of the double carbonatet can then be easily decomposed by
leading steam into it through a wide tube. The dangerous bumping
which always happens when the concentrated solution is boiled is thus
completely avoided. In this way, after three or four purifications, it
is easy to obtain a sample of glucina which when fused with acid
potassium fluoride dissolves in water containing hydrofluoric acid
without leaving the slightest trace. A very convenient form of
charcoal for mixing with the oxide to prepare the chloride is a kind of
lamp-black known in trade as gas-black. When burnt it leaves a
much smaller quantity of ash than the best sugar charcoal, and can be
mixed with the oxide much more easily and intimately than the latter.

Most of the metallic glucinum prepared from this pure chloride was
in the form of thin, lustrous, highly crystalline lamine. The purer
portions were selected and compressed in a steel mortar to a compact,
lustrous cylinder 11 mm. long and 8 mm. in diameter.

* “ Berlin Ber.,” xiii, 1456.

+ The latter experiments were done before the former.
1 See Appendix A.

On the Atomic Weight of Glucinum. 3

An analysis of a portion of this metal after the specific heat deter-
minations had been done was conducted as follows. Since aluminium
was absent in the oxide and could not have been introduced during
the preparation of the metal, the only impurities to be looked for were
silicon, iron, and glucinum oxide. On solution of the metal in a
dilute acid, the silicon would mostly remain behind in the free state,
but a part would be liberated as silicon hydride.* The oxide would
also remain undissolved as the metal had been heated up to 450°
in the specific heat determinations. The iron would, of course,
dissolve.

29°4 merms. of the metal was dissolved in dilute sulphuric acid, and
left a minute, 1mponderable residue, which was estimated at 0'2 mgrm.
It remained floating in the liquid for some time, was light coloured,
and was probably glucina mixed with some ferric oxide. The iron in
solution was estimated by the depth of colour produced by ammonium
sulphocyanate, just as by the operation known as “ Nesslerising ”
minute quantities of ammonia are estimated. I believe this method
gives more accurate results for the estimation of very small quantities
of iron than the usual process with potassium permanganate. In
using a dilute solution of this reagent a considerable excess must be
added before the pink colour becomes visible, and the end point or
amount of excess is very difficult to determine; whereas with
ammonium sulphocyanate and working under similar conditions it is
very easy to match the two colours and to determine accurately a
minute quantity of iron. The iron in the above solution of glucinum
sulphate was oxidised by a drop of weak bromine-water, the excess of
bromine boiled off, and a given volume of ammonium sulphocyanate
added in a Nessler cylinder. To another similar cylinder, containing
the same quantity of free acid and ammonium sulphocyanate and
made up to the same volume, was added a solution of ferric sulphate
containing 0°l mgrm. iron per c.c. Of this solution 0°3 ¢.c. was
required, corresponding to 0°03 mgrm. iron. The composition of the
metal was therefore :—

GGIMMMS sc. ki see Le Ce CAG)
GRRE 1A msans sone oes Coe 0:70
| Sed ges on ele ae eee os 0-10

100-00

in other words, it was almost pure. Its purity was also shown by the
difficulty with which it dissolved in dilute acids. A -small piece
which had been left in dilute sulphuric acid (1 : 10) over night was
only partly dissolved in the morning, but solution took place rapidly
on warming.

* The silicon in commercial magnesium behaves in this manner.
Bie

4 3 Prof. T. 8. Humpidge.

Several attempts were made to determine the density of this block
of metal. They were all unsuccessful, owing to the difficulty of com-
pletely removing the enclosed air.

Another sample was therefore used in the loose form as extracted
from the iron boats. The following results were obtained :—

daze = 1:88 G), 1°90 Gi); mean = 1°89.

The composition of this metal was—

3 ara tian sega pte 99-00
GlOe. Lakers 0°43
Bet vet aeueke . 0°57

100°00

and making allowance for these impurities the true density of gluci-
num becomes d22=1°'85.

a

SSS

eee

il
i
I

=~

SS

————

I

Owing to the smail amount of substance used (about 59 merms.),
the result is only accurate to the second decimal place.

On the Atomie Weight of Glucinum. D

The calorimeter employed was an improved form of the instrument
described in my former paper (loc. cit.). The opening and closing of
the two sliders, and the movement of the catch to release the substance, _
were, however, made automatic by suitable electrical connexions. It
was thus only necessary to run the calorimeter under the heater and
back again in order to transfer the substance from the latter to the
former. The calorimeter (M, fig. 1), with its brass casing, and the bent
thermometer (t,), were the same as those used before ; the agitator (P)
was worked by a small electromotor (T). Two new heaters were used,
one for temperatures up to 150°, and one for temperatures from 150°

es, As

to 300°. The former (fig. 2) consists of a double brass vessel with
a thick jacket of slag-wool. The vapour of the boiling liquid passes
from:the boiler to the heater by one tube, and leaves by another, is
condensed and flows back to the boiler. The liquids used in this
heater were methyl alcohol, water, and xylol, but the results obtained
with the first-named liquid were inaccurate owing to the small rise
(0'6°) in the temperature of the calorimeter. In this apparatus it is
possible to obtain a temperature constant to 75° for any length of time.*

The heater for high temperatures (A, fig. 1) was made on the
pattern described by Lothar Meyer}, the construction of which will
be evident from the figure. C is an outer non-conducting casing,
L is a ring burner, from which the heated gases pass up through
the heater and escape through perforations in the double lid (V).
This heater is mounted on a thick slab of asbestos (D), by means of
which it stands on two brass plates (EH), which are separated from
one another by a coil of thin lead tubing, through which a current

* This is only true for a liquid with a constant boiling point; the xylol used had
to be fractionated several times before a constant temperature could be obtained.
+ “ Berlin Ber.,’’ xvi, 1087.

6 Prof. T. 8S. Humpidge.

of cold water flows. In this way the chamber (B) into which the
calorimeter has to be run is kept quite cool. A double tin screen
(not shown in the figure) serves also to prevent the calorimeter
from receiving extraneous heat. The whole operation of trans-
ferrmg the substance from the heater to the calorimeter can be
performed in less than two seconds, and the gain of heat by the
calorimeter during this period cannot be measured. In a series of
blank experiments it was found that when the calorimeter remained
under the heater (at 300°) for 15 seconds, the thermometer ¢, rose
itz. The temperature of the substance in the heater was measured
by three delicate thermometers from Geissler. Their fixed points
were determined in ice, water, naphthalene, and benzophenone, but
they were not calibrated. ‘The gas supply for this heater was reeu-
lated by three regulators made by Giroud, of Paris, burning 60, 80,
and 110 litres of gas per hour, and giving temperatures of 200°, 240°,
and 310° respectively. With these regulators the temperature could
be kept constant to about $°, provided there were no great fluctua-
tions in the gas pressure. I have sadly felt the need of a good regu-
lator for high temperatures.* The suspension of the substance (S) in
the heater was by a small pair of tongs, made so that the jaws open
when the arms are closed. The tongs with the substance are sup-
ported by a thin platinum wire which is attached, outside the heater,
to a thread passing over pulleys and fastened to a catch (K). When
this catch is released the tongs fall by their own weight until they
reach the rmg X; this brings the arms closer together, and the sub-
stance drops into the calorimeter. The connexions are so arrauged
that when the calorimeter is run under the heater, the lid of the
calorimeter casing is first opened, then the slider under the heater,
and finally the catch is released, and the substance falls. As the
calorimeter returns the two sliders are again closed.

The liquid used in the calorimeter was purified turpentine, of
which the specific was determined as follows :—

G.) By the method of mixtures, using metallic magnesium, of
which the specific had been found to be ¢j,=0°2442. This gave for
the turpentine /,)=0°4146.+

(11.) By Andrews’ calorifiert the mean of two series of experiments
gave kjy=0°4103.

(i1.) By Pfaundler’s apparatus§ (Joule’s principle), in which equal
weights of water and turpentine contained in two similar calorimeters
are heated by two platinum wires of equal resistance, through which

* IT am much indebted to Professor L. Meyer for advice and assistance in the
construction of these two heaters.

t+ For details of these and the following experiments, see Appendix C.

t “ Ann. Chim. et Phys.” [3], xiv, 92.

§ “ Wien. Akad. Ber.,”’ lix.

On the Atomic Weight of Glucinum. 7

the same current passes. Three experiments gave the mean result,
Fj 9=9°4085.

The general mean of these experiments is k,)=0°4112.

The specific heat of water was taken as 1-0000 at 0°, and the cor-
rection for temperature used was that obtained by Miinchhausen and
Willner, and by Baumgartner and Pfaundler, viz., k;=1+0-0003¢.
Regnault’s expression for the change in the specific heat of tur-
pentine was employed, 2.e., k;=hy+0°00124¢, omitting the third
term, which only inappreciably affects the results in the small range
through which the liquid was heated.

The following table contains the results of the specific heat deter-
minations of glucinum* made with this apparatus. Column I gives
the results actually obtained ; Column II these results corrected for
the impurities contained in the metal :—

if BE:
Hxperiments land 2 .... Ci = 0°4267 0°4286
7 SP aay Aten sacs Crs O:4iD OQ) 0°4515
- Dit ee Oe ody Cag = OAOFO 0°4.696
= Gee ON atest t Gry 0 4806 0°4885
bs 9 10 ..:. G2 = 05087 0°5105

These numbers show a rapid and continuous increase in the specific
heat as the temperature rises. In order to find whether this increase
continued above 300°, two experiments were made at higher tempera-
tures with a double calorimeter. This calorimeter consisted of two
thin brass vessels, placed close together with suitable thermometers
and agitators. One of these received the glucinum, and the other a
platinum cylinder of known weight. These two substances were
placed in two similar glass tubes, packed side by side in a wide iron
tube with slag-wool, and the whole heated in the furnace which was
used for the vapour-density determinations.— After the heating had
been continued for about three hours, the iron tube was withdrawn,
and the substances quickly tipped into the calorimeters. In calcu-
lating the temperature, Violle’s results of the specific heat of platinum
at varying temperatures were used. These two experiments gave th
following results :—

im EK.
Peperimenti lh oicwsd asin Gy = 05178 075199
#3 1a eer ee Ge = 05384 075403

which show that although the specific heat continues to increase, i
does so more slowly than at lower temperatures.

* The metal was enclosed in a platinum capsule, soldered air-tight with pure gold.
t See Sequel.

8 Prot se Humpidge.

The quantity of heat (Q;) required to raise 1] gram of a substance
from 0° to ¢° can be expressed by the equation—

Q: = ki + af? + Be,

where & is the true specific heat at 0°, and « and #6 are constants.
From this equation the mean specific heat between any two tempera-
tures (¢' and ¢) is

=k+a(t+?#)4+ 64 tv’ + 2%),

The numerical alin obtained for the three unknowns from the
experimental values of cj are

k = 0°3756; «a = 0:00058; B = —0-00000038.

A comparison of the value for the mean specific heats calculated from
the above expression with those obtained by direct experiment shows
that the two agree within the experimental errors, and that this
expression correctly represents the change in the specific heat of
glucinum.

ee oe found. oe calculated.
Tes 1067 0°4286 0:4302
134445 0°4515 0°4505
HL. -- ¥93 0°4696 0°4687
15 : 240 0°4885 0°4875
TA re.ohe 0°5105 0°5097
11. 360 0°5199 Oa 2a Ls)
7 Ady 0°5403 0°5425

The three constants being known, the true specific heat at any
temperature (k;) is found by making ¢’=?, and the above equation
becomes

ly =k + Qat + 382,
or with numerical values,

k~ = 0°3756 + 0:00106¢ — 0-0000011422,

whence the following values for k; may be calculated—

it, = 03750
kyo = 0°4702
krogq = 0°54:20
(ern — a Oes S0
Kany = O'6172

liso) = 0°6206

On the. Atomic Wetght of Glucinun. a]

Curve showing specific heat of glucinum at varying temperatures.

A curve showing the true specific heat at varying temperatures is
given in fig. 38. According to the above expression the specific heat
reaches a maximum at about 470°, and then falls. But it is doubtful
whether this expression would correctly represent the specific heat at
temperatures above 500°. Weber’s experiments with diamond and
graphite tend to confirm this doubt. His results between —79° and
+ 280° show a rapid increase in the specific heat, and give a para-
bolic curve similar to that obtained for glucinum. But in the other
experiments which he made between 600° and 1000° the increase in
the specific heat is much less rapid, and the curve takes another
form. However this may be, my results show that the specific heat
of glucinum rapidly increases up to about 400°, and that between
400° and 500° it remains practically constant at the approximate
value of 0°62. If this number is muitiplied by the atomic weight
taken as 9:1, the atomic heat becomes 5°64. It is therefore clear that
this number represents the true atomic weight, and not 13°6, as was
previously deduced from the specific heat between 100° and 10°.
Glucinum is thus to be classed with those elements of which’ the
specific heat increases rapidly with the temperature, and, like most
elements with low atomic weights, its atomic heat is considerably
below the average.

The expression for the true specific heat of the metal given by
Nilson’s results is similar to that obtained from mine. His values
for the constants, as calculated by me, are: k,=0°3710, «=0°00058,
and B=—0'00000044, which closely agree with those derived from
my experiments.

10 7 Prof. T. S. Humpidge.

II. Vapour-density of Volatile Glucinum Compounds.

The compounds of glucinum which can be volatilised unchanged
are those which it forms with organic radicals and with the halogens.
Of the former class Cahours states* that he has prepared the ethide
and propide, and gives their boiling-points, but all my efforts to
prepare either of these compounds in asufficiently pure state to deter-
mine its vapour-density were fruitless. I operated, as Cahours
recommends, on an excess of metallic glucinum with mercuric ethide
or propide in sealed tubes; but either the tubes exploded violently,
always when a temperature of 135° was exceeded, or if the change
was successfully accomplished, as shown by the separation of metallic
mercury, the compound decomposed again on distilling. Mercurie
ethide acts on glucinum chloride, slowly at 100°, more rapidly at 130°,
and a considerable quantity of mercury ethyl chloride is produced,
which partly remains dissolved in the excess of mercuric ethide, and
partly separates out in the usual pearly scales. A similar reaction
takes place between mercuric ethide and glucinum bromide, but from
neither of these reactions couid a volatile compound of glucinum be
obtained. I hope to be able to examine these interesting reactions
at a later date.

As the organic compounds of glucinum were not available for
vapour-density determinations, my attention was directed to the halo-
gen compounds. The bromide, chloride, and iodide of glucinum are
all volatile, and their volatility is in the order named. ‘The first two
volatilise without decomposition if water and air are absent; the
last-named decomposes on heating. In the presence of a trace of air,
both the chloride and bromide decompose when heated, the latter
more easily than the former ; in both cases the haloid element is set
free. And since both these compounds corrode glass and porcelain
when vaporised in vessels of these substances, the determination of
their vapour-density is a matter of some difficulty.

I first made some determinations in glass tubes with the chloride,
using Schwarz’s modificationt of V. Meyer’s displacement method.
The glass was corroded, and the results were not concordant. Porce-
lain was also attacked. The tubes nearly always contained free chlo-
rine, although the experiments were done in pure dry nitrogen. It
was then decided to try platinum for the determination, and after it
had been found that glucinum chloride could be sublimed unchanged

* “ Compt. rend.,” Ixxvi.

+ ‘ Berlin Ber.,” xvi, 1051.

The obvious errors in this modification have been pointed out by V. Meyer
(‘‘ Berlin Ber.,” xvu, 1334). They are chiefly that a portion of the wide tube is
irregularly heated, and that the large boat which carries the substance takes air
with it in its fall into the tube.

On the Atomic Weight of Glucinum. Bi

in a platinum tube in a stream of nitrogen, a platinum vessel was ob-
tained from Messrs. Johnson, Matthey, and Co. This platinum vessel
was of the usual size and dimensions of those employed for vapour-
density determinations by displaced air, except that the narrow tube
was about one-half the ordinary length. The open end of this tube
was firmly attached to the upper part of the usual glass apparatus by
well-wired caoutchouc tubing.* The substance was introduced, and
the displaced air measured by the method used by Meier and Crafts+
in their researches on the vapour-density of iodine. Asa graduated
vessel for the reception of the displaced air, an ordinary calibrated
burette was used, the lower end being connected with a tube of the
same width by strong caoutchouc tubing. These two tubes were held
in common retort-stand clips, and could be easily adjusted, so that the
mercury was at the same level in each. They were connected with
the vessel in the furnace by a narrow glass tube (1 mm. bore), and
the one containing the air was immersed in a vessel of water. As a
furnace, two of Fletcher’s draft furnaces were used, placed one above
the other, with a wide clay cylinder between them. This gave a
chamber 30 cm. high and 12°5 cm. in diameter, which could be heated
up to any temperature from about 400° to 800°. The temperature
could be kept sufficiently constant for these experiments with a good
gas tap.

The platinum vessel was freely suspended in two clay crucibles,
placed mouth to mouth, and with a hole knocked in the bottom of the
upper. This served to protect the vessel from the direct action of
the furnace gases. The temperature was measured by a Siemens’
pyrometer, the porcelain tube of which was connected with platinum
wires to the platinum vessel.t

With this apparatus the vapour-densities of glucinum chloride and
bromide were determined. Glucinum chloride was prepared in several
ways, but the best method was found to be that recommended by
Nilson, which consists in heating a few merms. of the metal in a
stream of dry hydrochloric acid in a narrow platinum tube. The
chloride is sublimed as near the end of the tube as possible, the con-
nexions removed, and a small cap fitted on the open end. The tube is
then cut off with a pair of scissors, so as to form a small capsule in-
closing the chloride. This is introduced into a well-corked glass tube
and weighed. While the preparation of the chloride was going on, the

* During the progress of this part of my work, I received the account of Nilson
and Pettersson’s experiments on the vapour-density of glucinum chloride (‘ Berlin
Ber.,” xvii, 987). It will be observed from the sequel that I have adopted some
details from them, notably the use of carbonic acid for displacement.

7“ Berlin Ber:,/7 xii Shik.

~ For a description of the construction and graduation of this instrument, see
Appendix B.

12 Prof. T. 8. Humpidge.

apparatus was gently heated, and:dry carbonic acid passed through it
by a glass tube going to the bottom of the platinum vessel, until the
issuing gas was completely. absorbed by caustic potash.* The glass
tube was then gradually withdrawn, and the temperature raised. As
soon as the temperature had become constant, which was easily seen
by the mercury remaining stationary in both tubes and the resistance
of the pyrometer being constant, the cork at the top of the vessel was
removed for an instant, the small platinum tube with the substance
dropped in, and the cork immediately replaced. The equilibrium
was thus hardly disturbed, and afew minutes afterwards the substance
was allowed to fall into the heated vessel. :

In the two following determinations (the only ones which were
made) evaporation commenced at once, and was complete in about
twenty seconds. The followimg are the data of these two experi-
ments :—

Exp. Substance. Displaced CO,. — t. d.
Ly josgiteke eet 26°4 merms, CA? c.c. 635° 2°733
2s goukh eae 20 (Son 785 2°714:
Wiese < creer 2° 724:

After each experiment the platinum vessel was washed out with a
mixture of potassium iodide and starch, but no trace of free chlorine
was found. The small platinum tube was then washed with water,
dried, and weighed; this gave the weight of the substance used.

The vapour-density of glucinum bromide was next determined in
the same apparatus. This substance can be obtained hke the chloride,
by heating the metal in dry hydrobromic acid, but, owing to the diffi-
culty of obtaining a regular stream of the dry gas, it is here prepared
by burning the metal in gaseous bromine. Combination between the
two elements takes place at a low red heat, with brilliant incan-
descence. The crude bromide is afterwards purified by resubliming it
in a current of hydrogen or carbonic acid. Like the chloride, it can
be sublimed unchanged in carbonic acid. Glucinum bromide sublimes
at a lower temperature than the chloride, and, unlike the latter com-
pound, vaporises before it melts. It begins to volatilise at about 450°.
When carefully sublimed at a low temperature, it forms beautiful
snow-white silky needles, and does not attack glass if air and moisture
are perfectly absent. If heated in the presence of air, free bromine is
at once produced.

A quantity of the crude substance was prepared by heating a few

* There was always a minute bubble of air left unabsorbed by the potash, even
when the gas was passed through the apparatus for 20 hours. It was probably
due to diffusion through the caoutchouc connexions, and did not appear to in-
fiuence the results.

On the Atomic Weight of Glucinum. 13

centigrams of metallic glucinum in bromine vapour. This was purified
by sublimation in dry hydrogen, and was finally sublimed into several
narrow gilass tubes, each of which was sealed up. When a determina-
tion was to be made, the two ends of one of these tubes were cut off,
and the solid lump of the bromide quickly rammed into a small plati-
num tube closed at one end. A cap was fitted on this tube, and it
was weighed in the same manner as the chloride.

The vapour-density was determined like that of the chloride, and
the following are the data of the four experiments made :—

Expt. Substance. Volume of CO,. t. d.
1 we ae AA(? ! evaporation very
Tha slow.
Ze 35°9 mgrms. 4°28 c.c. 608 6487
a a Gin, Loo 630 6:276
4A... 20:0) 4 EP oe 606 6245

Mean 2...) 62336

In these experiments there was always a trace of free bromine pro-
duced. In experiment 4, where it was largest, the iodine, set free
on the addition of potassium iodide, was estimated by centinormal
potassium arsenite, of which 0:2 c.c. was required. This corresponds
to 0'16 mgrm. bromine, or less than 1 per cent. of the quantity present.
The decomposition which had taken place could not, therefore, affect
the result to any appreciable extent, and that the substance had com-
pletely evaporated was proved by the fact that the small platinum
tube weighed the same before and after the experiment within one
or two tenths of a milligram.

The possible densities for glucinum chloride and bromide are—

ori Cls.... 1 2 2:76 Hor GIGI... .. 4-14, and
PC Bry 6... 5:84 Gl Bre 8 896

The values found were—
Hore Glos ecco. Deer, chat, stor (GdUexey yale ene 6°34.

It is therefore evident that the molecules of these two sub-
stances in the gaseous state are represented by the formule GICl,
and GIlBr, respectively, in which the metal is a dyad, and has the
atomic weight 9:1. Thus from Avogadro’s law, to which there are no
known exceptions, the conclusion is confirmed which was obtained
from the specific heat of the element at high temperatures.

The long disputed question of the atomic weight of glucinum is
thus definitely and finally decided in favour of that number which
satisfies the requirements of the periodic law, and another element is
added to the long list of those whose atomic weights have been cor-

14 Prof. T. 8. Humpidge.

rected by this important generalisation. In all future determinations
of the atomic weight of an element, the position which the element
should occupy in the periodic arrangement must receive due import-
ance, and had I fully recognised this two years ago, I should perhaps
have stated my conclusions and criticisms less positively than I did.

APPENDIX A.

On the Composition of the Double Carbonate of Glucinum and
Ammonium.

An analysis of this important compound has been published by
Debray,* but the formula he obtained being somewhat complex, I
have prepared and analysed the pure substance. A strong solution of
ammonium carbonate was digested with moist glucinum carbonate at
a gentle heat until saturated. The clear solution was then heated
until it became cloudy, and any excess of ammonium carbonate decom-
posed, then again filtered and mixed with its own bulk of strong
alcohol. The crystals, which only separated slowly and adhered
firmly to the walls of the containing vessel, were drained, washed
with alcohol, and dried between filter-paper.

The analyses of two separate specimens gave the following
results :—

if. if & Mean. Calculated.
DEO ne eases 1S 77 19°22 19-00 18°40
COs ws tien 4 42°13 43°16 42°65 43°00
CNEL) O-- 26:39 26°25 20 oF 25°41
HO AGin.) 2. L270 37 12°04 13:19
100°00 100:00 100-00 100-00

which correspond to the formula 2(G1CO,,Am,CO;),G1l(OH),+ 2H,0.
This resembles the formula obtained by Debray, viz.,

3(G1CO,,Am,CO;),G1(OH),,

but contains more water. Both of my specimens were dry crystalline
powders, without a trace of adhering alcohol, and with a faint odour
of ammonia. Specimen II had been kept for several weeks in a
stoppered. bottle.

* “ Ann. d. Chim.” [8], xliv, 5.

On the Atomic Weight of Glucinum. 15

APPENDIX B.
Note on Stemens’ Pyrometer.

The following are the details of construction and graduation of the
pyrometer employed in the vapour-density determinations. About
100 em. of thin platinum wire (0°13 mm. diameter) was coiled round
a thick piece of ordinary clay tohacco-pipe, and three thicker
platinum wires were soldered with gold to the two ends. To these
thicker wires were soldered three copper wires, which went to the
bridge where the resistance was measured. The whole was enclosed
in a porcelain tube, one end of which had been closed by a plug of
clay, and the wires were so arranged that the junctions between the
copper and platinum came at the same height, just within the tube.
By suitably arranging the three wires and a known resistance in the
arms of the bridge, measurements could be made of the resistance of
the thin coil without that of the leads, so that any change in resist-
ance was due to the altered resistance of the coil alone. The wire of
which the coil was made had previously been heated several times to
redness.

In order to graduate the instrument it was immersed in melting ice,
boiling water, aniline, diphenylamine, sulphur, selenium, and zinc.
For boiling these substances (with the exception of water) iron tubes
welded together at one end, of 5 cm. diameter and 46 cm. length,
were used. The upper portion of the tube for about 8 cm. was sur-
rounded with a coil of thin lead tubing, through which a stream of
cold water was allowed to flow. This acted as a very efficient con-
denser, and kept the upper part of the tube cool enough to handle
easily. The results obtained are expressed in the following table, in
which the first column gives the substance, the second its melting
or boiling point, and the third the actual resistance found. In the
fourth column the resistances are reduced to that at 0°=1, and in the
fifth are given the corresponding resistances, calculated from the
empirical formula—

re = 1 + 0:0027¢ — 0°000000192?.

Substance. t. Ts, r, = 1. Calculated.
COL Rete eis 0° 13°42 1-000 1-600
Water eat ais es 100 17:02 1°268 1:268
Amiilimiery Ces ae as. 184 20°08 1496 1°493
Diphenylamine.. 310 24°43 ISTg i Stow ey)
Sulphur........ A448 99-14 2171 172
Selenium: % s). ch 665 36°08 2°688 2°712

PING: 0.0 aropetens 6 940 45°38 3°38] 3370

16°). Prof. T. 8. Humpidge.

The agreement between the calculated and observed results is good,
except in the last two instances. The selenium probably contained
some sulphur, which would lower its boiling point, and only one
experiment was made with zinc, as this temperature could only be
reached in the furnace used under an exceptionally favourable gas
pressure.

The change in the resistance of commercial platinum has been
investigated by the late Sir W. Siemens, M. Benoit, and others.

Siemens expressed his results in the form—

r = r(AT! + BT —C),

and this can be thrown into a general expression similar to that
which I have used, viz. :—

vg = 7o(1 + at — Be).

Benoit’s results* can also be expressed by a similar formula.

But although there is a general agreement between these different
results, the values of the coefficients vary considerably, and it is
therefore always necessary in using this pyrometer to calibrate it for
every wire. I have even found that the change of resistance of two
pieces of wire from the same bobbin varied considerably.

M. Benoit has kindly furnished me with the following synopsis of
various results, which, although they differ much from one another,
can all be expressed by the general formula given above :—

Siemens.
— SSS

i. iby it, III. Benoit. Erhardt.f Humpidge.

OF 6 00. 1:00 1:00 1:00 1:00 1:00
HOON aeZo 1°25 134 1°23 1:23 1 2Z
200i al elead 150) 1°62 1:46 1:46 }5e
400... 1°84 1:98 D2 1:91 1:90 2°05
GOW san) 26 2°48 2°81 2°34 2°31 2°95
S00rs! 12°43 2°97 oon 2°75 2°69 3°04,

* Compt. rend., lxxvi, 342. The formula is incorrectly given in Wiedemann’s
“ Hlectricitit,’’ the sign of second coefficient being positive instead of negative.
One of the temperatures used in this research was that of boiling cadmium, which
was taken from the earlier and incorrect determinations (with an iodine thermo-
meter) of Deville and Troost as 860° instead of circdé 770°. M. Benoit has,
hewever, informed me, in a private communication, that on introducing this cor-
rection the general form of the equation remains the same.

+ “ Wied. Ann.” xxiv, 215.

On the Atomic Weight of Glucinum. Li

AppENDIXx C.
Details of Specific Heat Determinations.
I. Specific Heat of Turpentine.
G.) By Method of Mixture with Magnesium.
(a.) Specific Heat of Magnesium.

w=weight of substance, w’=weight of platinum wire as support,
W=weight of water; water-equivalent of calorimeter, agitator, and
thermometer=2'84, T=temperature of substance, t=initial tempera-
ture of liquid, 0=final temperature of mixture, c=calculated specific
heat. {Specific heat of water at ’=1+0-00032. |

Mpapueilea. 2 — 40/39. a = O 156, W =) 85:21,
a9 Ol 40" =I of Ga TAT

may == O;2474.

Bape ie Wi 807220") (== 99°-96, A) =, LI 38) ¢ = 107-21
he Gy == OSH a

ae NV Oo 22, I — 987-80, 8. = 127-79) ¢ = 11-65
2 Cg = 0:24.28.

Bespina. © Wizz Sor22. = 98778, 6 = 137-78, 2 = 12°66
Gy == O' 2412.

Mean: cif? = 0°2442.

(b.) Specific Heat of Turpentine.
wand w’ as before. W=weight of turpentine, equivalent of calori-
meter, &c.=2'83.
Breage ls Vie ocUn h 3 987200 == WAS af fl 7,
Cy = 0-41 11.

ieapt, 2a, Wa 75°17, == 99°"o4. 2
*, 6, = 04274,

Epis oe ae VWVi=170 12,0 == 98°20) 6 == A760) ¢

15°27, ¢ = 12°47,

= 11°-74,
7. 3 = 04206.

Expt.4.. W= 75:43, T = 97°95, 6 = 12°97, ¢ = 10°03,
.°. Cy = 0°4140.

Expt.5.. We= 75:02, T = 97°-98, 0 = 13°58, ¢ = 10°64,
5 = 0°4131.

VOL. XXXIX. C

18 Prof. T. 8. Humpidge.
Expt.6.. W= 75-09, T = 99°26, 6 = 14°50, ¢ = 11°-62,

7. Ce == O4A 7
Hxpt. 7... W= 76:24, T = 99°50; 6 = 15°00, ee
i. 1; = 04210)

Mean 5 Dae = Kiio-7 = 0°4179,
and yy = 04146.
(ii.) By bwernenes’ Calorifer.

Hquivalent of calorimeter and thermometer=10°33, weight of
water=262°34. The mean of five experiments gave 0=8°°436,
p= HOloe

whence equivalent of calorifer=

= 27267 <x 142 =38719 = 1:0028

In two series of experiments, using turpentine instead of water, the
following results were obtained :—

Series 1.— Weight of turpentine=229°26,
@ = 12°-298, ¢ = 8°:594 (5 experiments)
. Kyo.5 = 04107.

Series 17.—W eight of turpentine=229°26,

6 = 12°:480, ¢ = 8°°790 (4 experiments)
Siege acs = 0°4115,
whence pe Oe Bh Oa

(au.) By Electrical Method.

Mean of three experiments gave

kyg.2 = 0°4180, compared with water at 14°-2,
whence Ep = aso,

The general mean of the three sets of determinations is
key = 0°4112,
which was adopted, with a correction for the temperature, in calcu-
lating the specific heat of glucinum in the following experiments :—
Il. Specific Heat of Glucinum.
(i.) In Turpentine. |

Weight of substance=0°745, weight of platinum casing=1°527,
water equivalent of calorimeter, &e.=2°83.

Expt. 1..

Expt. 2..

and

Expt. 3..

Expt. 4..

and

Expt. 5.

‘Bhept. 6...

and

oa

Expt. 8..

and

Bxpts 9. .

Expt. 10..

and

On the Atomic Weight of Glucinum.

Wl eG = 994 a EE 29,
eG = 04272.
Wi 1459S) DiS 997-36, 6 —-11°-08;
eee, Ge |O'4.262-
eg2 = 0°4267.
Wi 7097.8 Se 1452) 6 11°95,
2. ¢; = 04481.
We (4:97, T= F450:2. 0 = TA"63,
ene ts == 04018:
Gace = 04500:
Wi 74:87. TP = 1907. 6 = 10°08;
.. ¢; = 0°4668.
Wa c4 575 = 19682, @ == LL 18,
o”. Co = 04684,
nee = 04676:
Wi 7497, TS PAL 9, OS 14"58,
ao —— 0°4875. .
WW = 74-97). P= 236-2; & = 163-28:
76: = 04856,

clit = 0-4866.

We 749 T= 309° 9). 6 = 1472,
ép = 05093:

We 74-700 T= 313-56 = T4~6l,
- Cg = 05080,
Gay = 05087

(1.) In Double Calorimeter.

19

i = 1083S
ga AE Oise EZ
¢ = 10°-44,
= 1515,
t — 7°95,

Aono:

= FE om
1 Se st
& =. 107:99:
&. = 102-83:

Weight of platinum cylinder=24°346, W=weight of water and
equivalent of calorimeter, &c. I (for platinum), W’=weight of water
and equivalent of calorimeter II (for glucinum). ,

Expt. 11.

whence
and
Expt. 12.

whence

and

We ==:05°15,.0 =" 12°52) ¢ ==> 9°53,
= 359-3".
We = 93-46. Oh - L720. ¢ = 10°: LI,
Ge Oren ee:
We 96719) 8 = fj BS e0y a) =: 14°88;
Ts 447°:1.
Wiarton (46 Oe == 15°50
Gg == 9364.

20 Mr. W. H. L. Russell.

“On Certain Definite Integrals. No. 13.” By W. H. L.
RussEL, A.B., F.R.S. Received June 18, 1885.

In a paper which will be found in the “‘ Proceedings of the Royal
Society ” for June, 1865, I gave methods for expressing the sum of
certain series by definite integrals, or in other words, of expressing
¥'(#) by the form /PQ*d@. As shown in my last paper, this method
is immediately connected with the solution of those partial differential
equations which have constant coefficients by definite integrals, a
circumstance which never crossed my mind til] lately. In the present
communication I hope to make further extensions in both these direc-
tions.

Case I. It was proved in the paper cited that the function

| So(n)+ Vx)

could be expressed in the form /PQ’d0, whereas ¢(n) and x(n) are
rational (misprinted identical) functions of (m7). In the same way we
may obtain A O(n) + 7 GaEe/ aan For it was proved in that
paper that “/(gn+ %/xn) can be expressed in the above form if

1 8
eX") (y(m)) 2 can be thus expressed, and therefore

Von V (x(n) +4/ ln)
can be thus expressed in the form /PQ’d@ if

1
| Eon) + Yaa)

can be expressed in this form, which can be done by repeating the
process,

This investigation assumes, however, that y() + /w(n) is less than
unity.

Case II. Suppose it were required to reduce eX, where N =
Vb(2) + x(n) + /w(n) to form fPQ"dé.

Then Sse) (sin 6)(1 —N®) and since the denominator can

aw), 1L—2Ncosé+N?

be rationalised, we fall back on Case I. N must of course be less
than unity.

Case III. When p is greater than 1

Le pet Mee
p 7 Jol—2pcosd+p?

and p?—1l=p?—2pcosd+1+2(p—cos@) cos 0Q—2sin*d.

?

On certain Definite Integrals. 21

Hence
_ th ee eis] ae aA camel cosé
1—2pcos0+ p? (p—cos@)? + sin?6”
‘ae 2sin20
(p—cos@)?+ sin20

© .2(p—c088) : . © -x(p—cosé) . ‘ ;
=142 cos | < cos z sin 6d@—2 sin of é€ sinz sin 6dé.

0 0

By this means #(=) can be expressed as double integral. So can
p

F(p), but then p must be less than unity.
We will now apply these considerations to the solution of linear

partial differential equations.
Let GE a ae or as we shall write it, F (« ay yo us 0
dx ~ dy

then e.. as before a specimen term Axv”y”, m and » must be con-
nected by the relations F(m, »)=0. Suppose from this we find

Then, as will be seen by the reasoning employed in my former paper,
the equation can be solved if

MEL O(n) + V x(a) + Von) +
can be expressed in the form fPQ”d0, which brings us to Case II.
The same process may in certain cases be applied to. partial differen-
tial equations with three independent variables. Consider the series
A+ Bae+ B'y+C2?+Cay+C"y?+, . . . when A, B, B’
are arbitrary constants. ‘This may be written on Poisson’s principles

Hi@)+ Boe. gt he@) ye ww

when Fj, F,, Fs, . . . are arbitrary functions, and this again
F(z, y) when F is an arbitrary function of the two variables.
du d*u

Now consider the partial differential equation ey ee 7 OG asl

dédy

shite d d ad .

shall write it (4, u=2( «— )( y— \u, and let Aw”y”z" be a specimen
dz du]\~ dy

term of the solution, as in previous cases, then r=2mn, and our

object must be to reduce w”y”2” to the form /PQ,”Q,”; this may be

easily done by remembering that 2mnu=(m+n)?—m?—n?, for

oo ~—(u—a)? ont
| € ‘i du= /7

22 On certain Definite Integrals.

fo 0) 2 be
Hence | e2au—u* dy e® J 1
—oo
Lee)
and therefore ee = 1 dlmtn)u-12 9
Tj)-a2 ‘
=n cM Ga = Ae &
also é =F e-P cos 2mpdp, and so for «” ,
9%] "00

These transformations give the required form.
If we have two partial differential equations—

d dz d
Ei eS, 9 a 0,
(27, “dy “)

d oda d
B(ot, y4, 2% )u=0
'G- “dy 27.) ;
then substitute as before Axv”y"z" for u; then we have the equations
FB (m, 2, r)=0, F,(m, n, r)=0,

whence m=@(r), n=x(r), and we fall back on the first case.

“On Certain Definite Integrals.” No. 14. By W. H. L.
RussEuu, A.B., F.R.S. Received June 18, 1885.

It follows from the expansion of cos"@ in terms of the cosines of the
multiples of 6, that

nm—l n—2 norTtd ae
9. Cre. | r 7

. cos n0 cos (n—2r)ede@,
0

and consequently this theorem can be used in the summation of series

involving binomial coefficients. I propose to give a few examples of
this.
- From the binomial theorem, when the index is even, we have

™ 3900s” 8 sin (n—1)0 cosng_ 7 21-1?) .. (n+l)
0 sin 0 22n 1.2...(m—1)

and when the index is odd,

2nt+1
[ao cos @ sin n0 COs no __ 3 if
0 sin 0

Since (1+2)*'=(1+2)"(1l—zv+2?—a3+ . . . . ), therefore
equating the coefficients of a", we have

The Vortex Ring Theory of Cases. 23

1—n+n. oat il ; ante . (r+1) terms

Hence i cos”—'6dé@ ‘ cos (n+1)0+(—1*" cos (n—2r+1)@) \
0

“The Vortex Ring Theory of Gases. On the Law of the
Distribution of Energy among the Molecules.” By J. J.
Tomson, M.A., F.R.S., Fellow of Trinity College, Caven-
dish Professor of Experimental Physics in the University of
Cambridge. Received June 4, 1885.

In any kinetic theory of gases the statistical method of investiga-
tion must be used, and since the separate molecules of the gas
are supposed to possess some properties to very different extents, it
is necessary to know how many molecules there are which have the
measure of any given property between certain limits. Thus the
question of the distribution of configuration and velocity amongst
the molecules is one of the most important problems in any theory of
gases. ,

This problem has been solved for the ordinary solid particle theory
by Maxwell and Boltzmann, and their researches are the more valu-
able as the results do not depend on any assumption about the law of
force between the molecules.

In this paper I shall attempt to solve the same problem for the
vortex atom theory of gases. In this case the question is a little
more complicated, as the radii of the vortex rings can vary as well as
their velocities. This is one of the most striking differences between
the two theories ; according to the ordinary theory all the molecules
of a gas are of the same size, according to the vortex atom theory the
molecules of the same gas vary in size. If this be true, a porous plate
of the requisite degree of fineness might play in this theory the
part which Maxwell’s demons play in the ordinary theory. For let
us suppose that we have two chambers, A and B, separated by a
porous plate, and that A is filled with gas initially while B is empty,
then if the pores in the porous plate are so fine that only the smaller
molecules can get through from A to B, then, though some of the
molecules will recross the plate, some gas will remain in B, and the

24 Prof. J. J. Thomson.

molecules in B will, on the whole, be moving faster than those in A,
and so may be supposed to be at a higher temperature, since the
smaller the radius of a vortex ring the greater its velocity. Thus B
and A might be the hot and cold chambers respectively of a heat engine,
and in this way work might be derived from the gas which was origi-
nally at a uniform temperature, so that this arrangement would not
obey the second law of thermodynamics. |

If the molecule on the vortex atom theory of matter consisted of a
single ring its velocity of translation would be a function only of its
radius. It is, however, for several reasons advisable to take a more
general case, and to suppose that the molecule consists of several -
rings linked through each other, the rings being nearly equal in
radius, and also nearly coincident in position; or what is perhaps
better, we may suppose that the vortex core forms an endless chain,
but that instead of being a single loop like the simple ring, it is
looped into a great many coils nearly equal in radius and nearly co-
incident in position. We may realise this way of arranging the
vortex core if we take a cylindrical rod whose length is great com-
pared with its radius, and describe on its surface a screw with n
threads so that the threads make m/n turns in the iength of the rod,
where m is an integer not divisible by ». Then bend the rod into a
circle and join the ends, the threads of the screw will form an endless
chain with » loops, and we may suppose that this represents the way
in which the vortex rings are arranged; it is shewn, however, in my
“Treatise on the Motion of Vortex Rings ”’ that this way of arranging
the vortex core is unstable if » be greater than six. When the vortex
core is arranged in the way just described, the velocity of translation is
no longer a function of the size of the ring alone ; at the same time when
a vortex ring of this kind moves about in a finid where the velocity is
not uniform, the change in the velocity of the ring will be due chiefly
‘to the change in its radius. For the velocity at a small distance d
from the circular axis of a vortex ring whose radius is a and strength
m is—

so that as 8a/d is very large, a change 6a in the radius of the ring
produces a change in the velocity approximately equal to—

while a change éd in the distance of the point from the circular axis
of the ring produces a change in the velocity equal to—

_ od m
d | 2ra

The Vortex Ring Theory of Gases. 25

Thus for the same relative changes of a and d the changes in the
velocities are in the ratio of log 8a/d to 1, and as log 8a/d is very
great, we may neglect the change in the velocity of the ring produced
by the alteration in the distance between the loops in comparison
with that produced by the alteration in the size of the ring.

The kinetic energy of a quantity of fluid containing vortex rings of
this kind may conveniently be divided into several parts. The first
part consists of the kinetic energy of the irrotationally moving fluid
surrounding the ring, the second part of the kinetic energy of ‘the
rotationally moving fluid; this again may conveniently be divided
into two parts, one part being the kinetic energy due to the rotation
in the core, and the other that due to the translational velocity of the
vortex core.

The kinetic energy of the irrotationally moving liquid surrounding
the ring may be expressed in several ways; itis equal to the strength
of the ring multiplied by the rate of flow of the fluid through it; the
most convenient expression for our purpose, however, is

Ava’,

where v is the velocity of translation of the vortex ring resolved
along the normal to its plane, a is the radius of the ring and Aa
constant.

(See p. 12 of my “ Treatise on the Motion of Vortex Rings.”’)

The energy due to the rotation of the vortex core is

5n7pm-a,

where 7 is the number of loops in the ring, p the density of the fluid,
and m the strength of the ring.
The kinetic energy due to the translational velocity of the ring is

EM (uw? +02 + uw),

where M is the mass of fluid in the ring and u?+v?+w? the square of
the velocity of the ring.
Thus if T be the whole kinetic energy due to the ring—

T=Ava? +4naz’*pm?at+dM(u?+v?+w?).

Let us consider a vortex ring placed in a fluid where there is a
velocity potential O independent of that due to the vortex ring itself,
the value of © is supposed to be known at every point of the fluid.

We have to fix the position, size, and motion of the ring. We can
do this if we know the coordinates (a, y, z) of its centre, its radius
(a), the direction cosines (J, m, n) of its plane, and V that part of the
velocity at the ring which is due to the ring itself. V is not neces-
sarily the actual velocity of the ring, for this latter quantity is the

26 Prof. J. J. Thomson.

resultant of V, and the velocity whose components are dQ/dz, dQ/dy,
dQ /dz.
Let t=la?, 4=mat, C—na?, o= Ve

Then we shall prove that it is possible to determine p and q so that
the number of molecules which have the values of g, y, 2, &, 9, €, @,
between 2, y, 2, & 4, [, w, and a+dz, y+dy, z+dz, E+dé, 4+dy,
€+df, w+dw, and for which the kinetic energy of the molecule and
the surrounding fluid is T, is when the gas is in a uniform and steady
state—

Ce" dadydzdédyndfdw,

where C is some constant determined by the number of molecules in
the gas.

We shall first prove that this represents a possible distribution
among the molecules of the quantities denoted by £, 7,¢,, when the
vortex rings are moving in a fluid whose velocity varies from point to
point ; we disregard for the present the effects of any collisions which
may take place among the vortex rings themselves. In this case the
rings are supposed to be so far apart that they do not influence each
other, so that the velocity of any ring is the same as if the others did
not exist. ‘T represents the kinetic energy due to the ring and the
distribution of velocity potential Q on this supposition.

We have to prove that if the distribution be represented by this
expression at any time, it will continue to be represented by it. This
will be the case if the expression

Ce" dadydzdédyndfdw,
remains constant as the molecules move about. Now T, the kinetic
energy, remains constant, so that we have to prove that
' dadydzdédydfdw |

also remains constant.

Since Q is the part of the velocity potential which is not due to
the rings themselves, by the equations on pages 65 and 66 of my
“Treatise on the Motion of Vortex Rings,’”’ we have—

igs
dt 2 anes
dl BQ a

dt dh? dhdx
in. <a
dt" dh? ~ dhdy’
dn_, FO _@O
dt dh?” dhdz’

The Vortex Ring Theory of Gases. ih

d d d d
h a ee fel 2
moe ie a ae aa
so that if éa, 61, 6m, dn be the changes in J, m, n respectively in the
small time t then—

d?Q
SS

ca= 20 a7,

Q Q
ae (Ae Oud oy, ,

dh? dhdz

aQ ada?a )

OE | (0 |
( adh? dhdy

a?Q a7 )
oe ee
( adh? dhdz

and if 6x, dy, 6z are the changes in 2, y, z in the time 7,

oL=UT,
oy=7,
oz =wr,

where uw, v, w are the component velocities of the centre of the
vortex ring.

Let 2’, y’, 2’, w', &, 7, ¢ be the values of 2, y, z, w, & 4, € respec-
tively after the time 7, then—

te UT,
y=y +7,
a=2+w7,
w' = w+ dw,
but since w= VY,
dw=qV2-16eV.

Now the change in V will be due to the change in the shape and
size of the ring, and as we saw before that this is due almost entirely
to the change in the radius, thus the change in V will be —Véa/a, or
substituting for 6a its valuae—

ed 4
i svi" a

ae
th =

28 Prof. J. J. Thomson.
Sot sans
=F+ pa? léa+aPel.
Substituting for 6a and ol, their values, we get

a : PQ, BO ,. Po
o=b— 3 Pt ie tite (tae tr te oe)
Sunilarly,
a PO PQ, BO. Po
14 Pr maa (fey? age * ae
PO, dO PO. BO, Po
ka ae GS a

If we neglect the squares of 6x, dy, 6z, dw, d&, dy, 8,

du dw =)

de!dy! dz’ dw'de'dy' de = dadydedudt dnd i ie — a
Y Z

dow , dag e dee

om de dies dt
dz dy dz
And by the equations written above
d.bw 4 dQ,
dw? ane”
and ac dof _
dé dy “Pde
d \d?Q
ala my (E+
| ( ae BPE Fe 1a +e) ae
a PQ. @2Q dO \ \
da® * dy® dy arr ;
PO PQA doa
But aes Euan
4 da® © dy? Tae d
and since
ES Ave WE
(Fiptep at Pry Pare). i iP + Oh a

we see that _ is a homogeneous function of &, 7, € of zero dimen-

sions, and therefore by Huler’s theorem
ft, yhoo

The Vortex Ring Theory of Gases. 29
hence da! dy’ dz'dw'dé’ dy’ dc’

2
= dedydzdwdédndé (2 Ge ooo CUD) a

so that if
qg=3(p—2)
dildy! di dw'dt! dr! dC —dedydedwdedn dt,
and therefore the distribution represented by the expression
Ce“ dedydzdwdédndé,

will be permanent if there are no collisions between the molecules,

We shall now go on to shew that this expression will represent the
distribution of coordinates and momenta among the molecules even
when collisions take place, at any rate if the collisions are not very
violent.

Let us call the group of molecules which have the quantities a, y, z,
£,7, 6, » between 2, y, 2, &, 7,6, w, and x+dz, y+dy, zt+dz, &+dé,
n+dy, €+dé, w+dw the group A. The number of molecules in this
group 1s

Ce" da dydzdwdédy dé,

all the symbols having the same meaning as before.

Let us consider another group of molecules which have their co-
ordinates between 2, Yj, 2, &> M1) Sp #1, and 2, +dx,, yy +dy,, 2,+d2,
& +dé,, 9, +44), G+dg, #,+dw,. We shall call this group B. The
number of molecules in this group is

De" da, dy,dz,dé,, dy dg, dw,.

We shall suppose that the molecules of the A group come into
collision with those of the B group, and that the values of the co-ordi-
nates after the collision are denoted by putting dashes to the letters
which denoted the corresponding coordinates before the collision.

In my “‘ Treatise on the Motion of Vortex Rings ”’ it is proved that
the effects of a collision depend on, in addition to the quantities
already specified, the angle which the line joining the centres of the
rings when they are nearest together makes with the shortest distance
between the directions of motion of the rings; let us call this angle ¢.
@ is positive for the ring which first passes through the shortest
distance between the directions of motion of the ring, negative for the
other ring, and it may have any value between —7/2 and 7/2.

We may suppose that a collision takes place when the shortest
distance between the centres of the two rings is less than some
assigned value ; it is not, however, necessary to limit ourselves to any
particular way of defining a collision.

30 Prof. J. J. Thomson.

Let yd@ be the fraction of the number of pairs of molecules which
come into collision in the unit of time and contain one molecule from
the group A and another from the group B, and for which ¢ is
between ¢ and ¢d+d¢. Then if the states in which the A and B
molecules are in after the collision be called A’ and B’ respectively,
the number of pairs of molecules which in the unit of time leave the
state {AB} and enter the state {A'B’} is—

cp|" Ape" T*T)) ydadydzd&dydgdwdz,dy,dz,dé\dy,df,dw,}.

2

Now the distribution will be steady if this equals the number of
molecules which leave the state {A’B’} in the unit of time, but this
number is—

7

cp| Api eT ME tT) dz! dy'dz'dé'dy'dg'dw'dz' dy'dz' dé’ \dy',de';dw'y}.

2

We can see that if the gas does not exhibit vector properties +
must equal y'. For since the motion is reversible, if any two molecules
whose coordinates are & 7, €, w; &, 9), €, #,, come into collision, then
the molecules whose coordinates are —£&, —y, —€, w; —&, —m,
—€,, w,, will also collide. let these latter molecules be said to be in
the states (—A'), (—B') respectively. Thus the percentage of collision
for the states (AB), that is for collisions between two molecules in the
states A and B, respectively is the same as for the state (—A’', —B’).
But since as many molecules are moving in any direction as in the
opposite, the number of molecules in the state —A!’ will equal the
number in the state A’, and similarly the number of molecules in the
state —B’ is the same as the number in the state B’, and since the
gas exhibits no vector properties, the mean path between the collisions
between the molecules in the states A’ and B’ must equal the mean
path between the collisions between the molecules in the states —A’
and —B’; and thus the percentage of collisions must be the same.
So that the percentage for the state (A’B’) equals the percentage for
the state (—A', —B’), but this, as we saw, equals the percentage for
the state AB; and, therefore, the percentage for the state AB
equals the percentage for the state (A’B’); or y=y’. Since the
collision may be fixed with regard to either molecule, and since ¢ is
positive for one molecule, negative for the other, we see that y cannot
change sign with ¢, so that if y is a function of ¢ it must be one of
the form—

1A=Vot 11 COSP+y_ cos 2ZP+....

The Vortex Ring Theory of Gases. 31
Again, dadydz=da'dy'dz'
dx, dy,dz,=da',dy’,dz',

and none of the quantities are functions of ¢.

We have also since the total kinetic energy is not changed by the
collision T+ T,=T’ + T,’, and neither of these quantities is a function
of ¢. Since this is so, we see that the expressions we have assumed
will represent a steady distribution if—

T us

iz ydp{ dédndgdwdk,dydgjduy } =|| = ydp(de'dy'dg dw dE dy’ dg dw’).
wus Ee

2

Let us suppose that the collisions are not violent enough to make
the vortex rings deviate greatly from their circular forms, and let us
consider the effect produced on an A molecule by collision with a B
molecule. Let Q' be the potential due to the B molecule, then just
as before we have—

osetten| aa

+0 20 ( [+o q@2O +0 2Q +0 d?2Q
= 1—4 —— dt— dt weed —— 4
é E+( wel dh2 fe axe 1 | dxdy & a ar

with similar expressions for 7’ and ¢’. Here hf is drawn along the
normal to the A molecule, and the coordinates are supposed to be
changed by the collision by only a small fraction of their values.
Now the only thing that makes any difference between this case
+ /J2
and the former one is that now | aa is a function of v, and

therefore of w. If therefore we assume that 3(p—2)=q, we have

o 2
dé’ dy'dé'dw' =dédydedw{1 + qu" GS \
dw} —o dh

—« dh
by § 29 of my “Treatise on Vortex Motion” is of the form f sin 34,
where f 1s a function of w but not of , thus :—

oo 2
Now i Ce is proportional to the change in w, and therefore,

dE dn dcdw! =dedndtdw{1 > igual sin 36}.
Ww

Similarly

1 if / d ! °
dé" dy’ dE"\dw'j=dé&,dy,dg,dw,{1+ qu, ol sin 3¢},
a

39 Prof. J. J. Thomson.

so that neglecting the squares of small quantities

d'dn' dd’ de yay’ = dn dG dud Ay dE de {1+ 3quL sin 39
w&
7
pig Sh sin 3p},
dw

and therefore

2 2
Since we see from the form of y that—

zr

| 7 sin Soydg—_0.

Thus the condition for a steady distribution is satisfied, and we
therefore conclude that a possible distribution of the values of the
coordinates among the molecules of the gas is represented by the
expression—

Ce dédyndfdwdadydz,
where E=la?, y=ma?, C=na?, w=02
and 3(p—2)=¢.

Let us consider the case when there is no external disturbance in
the fluid containing the vortex rings; the distribution will be uniform
in all parts of the fluid, so that the number of molecules which have
the quantities £, y, ¢, w, between & y, ¢, w and &+dé, y+dy, €¢+dé,
w+dw is independent of #, y, z, and so by the above formula will be
proportional to— ,

e—"Tdedndfdw,

or if the normals to the planes of the vortex rings point uniformly in
all directions the number of molecules which have a between a and
a+da, v between v and v+ dv is proportional to—

e *T g3p—lyi—-ldadv,
or substituting for g the value 3(p—2)
e—*T g3r- 18 Tdadv.

Though in the kind of molecule we are considering, a and v may
be treated as independent variables, still the limits of v depend upon
the value of a. For suppose the molecule to consist of n rings

The Vortex Ring Theory of Gases. 8a

linked together, then for a given value of a the velocity of the
molecule will be least when the links are so far apart that they do not
greatly affect each other’s velocity ; in this case v will equal—

m Sa
logy;
27a e

the velocity of the molecule will be greatest when the m rings are
close together ; in this case v will equal—
nm 8a
se og,
27a e
So that if we integrate first with respect to » we must do so between
these limits.
Since, however—

T=Aa?v+4nm?r?pat4Mr?,
we cannot perform the integration except between the limits zero and

infinity for both a and v; if, however, n be large, or the molecule
complicated, the results got by integration between the limits—

m log - and — lows 8a

27a TO
for v and zero and infinity for a will not differ much from those got by
integrating between zero and infinity for both a and v.

The second term in the expression for the kinetic energy is very
small compared with the first, so that it may be neglected without
causing sensible error. We shall find it convenient to take as new
variables the two remaining terms in the expression for the kinetic
energy; we shall call these new variables « and f respectively, where
x denotes the energy in the fluid surrounding the ring, 6 the energy
due to the translational velocity of the ring, so that—

Aadvu= a
IMv’=86,

and therefore
i
dad We d
v Wk 2d,
so that

3n—16

Cen °0-1430-Tdadu= C’e-Ha+B)x se? B 4 dadp,

where C’ is a new constant.

Thus the number of molecules which have the energy in the fluid
surrounding them between a and «+62, and also the energy due to
the translational velocity of the ring between £ and B+ 68 is—

VOL. XXXIX. D

34 Prof. J. J. Thomson.

3p—2 3p—16
C'e*etB)a 2 B 4 dadB,

and if the molecule is so complex that a and 8 may be regarded as
independent, then the limits of « and f are zero and infinity.

The quantity p is at present undetermined.

Let us apply this result to find the pressure of a gas on the
sides of the vessel which contains it. To do this we must consider
what takes place at the sides of the vessel. The general
nature of this action was described by Sir William Thomson
(‘‘ Nature,” vol. xxiv, p. 47). As the vortex rings move up to the
sides of the vessel they swell out and move slowly up the bounding
surface, where they form a layer of swollen vortices sticking to the
sides of the vessel. A vortex ring coming up to the surface tends
to wash off the vortex rings attached to the surface on either side of
it, so that when things have got into a state of equilibrium there is a
vortex ring washed off for each one that comes up. Thus the
pressure on the surface of the vessel will be the same as if the vortex
ring struck against the surface and was reflected away again with
its velocity reversed, if we assume, as seems natural, that the average
velocity of the.rings leaving the surface is the same as of those
approaching it. Thus each ring that comes up may be looked upon
as communicating twice its momentum to the surface, and we can
explain the pressure of a gas, just as in the ordinary theory. We
have to remark here, however, that the phrase momentum of the
vortex ring is ambiguous, as there are two different momenta con-
nected with the ring; there is (1) the momentum of the ring and the
fluid surrounding it; and (2) the momentum of the fluid forming the
ring alone ; this is proportional to the velocity of the ring, while (1)
is not only not proportional to the velocity, but in the single ring
decreases as the velocity of the ring increases ; in a very complex ring
it does not necessarily do this, but even in this case it is not propor-
tional to the velocity.

Now, when a vortex ring gets stopped by a surface the question
arises whether the momentum communicated to the surface is the
momentum (1) or (2). The answer to this question depends on what
we consider the nature of the surface to be. If the surface stops the
fluid as well as the ring, then no doubt (1) is the momentum which is
communicated to the surface. If, however, the surface stops the ring
but allows the greater part of the fluid to flow on, then the momen-
tum communicated to the surface is evidently approximately equal to
(2). If we consider that the surface is formed of vortex rings the
latter supposition seems the more probable, as the fluid in which the
rings move can hardly be supposed to be stopped by such a porous
surface. We may illustrate this by a mechanical analogy. Let us
suppose that we have a number of anchor rings with circulation

The Vortex Ring Theory of Gases. 35

established round them moving about in water, and striking against
a grating immersed in it. The momentum of the anchor ring will
consist of two parts, one due to the circulation, the other due to the
translational velocity of the ring. If the grating is so fine that the
Openings are only a small fraction of the whole area, then the
momentum communicated to the grating will be the whole momen-
tum ; if, however, the grating is a coarse one, so that the openings
form the larger portion of the area, then the momentum communi-
cated to the grating will only be the momentum of the ring itself.
And this seems to correspond to the case of vortex motion.

Thus if @ be the velocity of the gas resolved along the normal to
the boundary surface, the pressure on the surface per unit of area or
the momentum communicated to it per unit of time is—

using the same notation as before.
Now, the number of molecules which have the quantities 2 and §
between 2, @ and 2+dz, 8+d£ is proportional to—

—Ka+f) 3p—2 3p—16

é€ a2 6 4 dad,

so that if N be the number of molecules—

where ['(m) is written for

« :
| e Tf, ‘gt dz
0 ’

and the molecule is supposed to be so complex that we may, without
sensible error, suppose the limits of « and # to be zero and infinity.
We may take 1jh as proportional to the temperature 9 of the gas,
since it is the same for each of two gases which are in contact
with each other, and is also proportional to the mean kinetic energy
of the rings themselves.
Substituting the above value for ef, we see that the pressure equals

(p <5,

and thus varies as N@.

36 The Vortex Ring Theory of Gases.

Thus Boyle and Gay-Lussac’s laws follow from the vortex atom
theory.

At present the quantity p is quite undetermined. It could be
determined by comparing the coefficients of viscosity and the conduc-
tivity for heat of the gas, since these depend on the mean values of
different powers of #8, and the ratio of such quantities evidently
depends on p. In this paper I shall not consider the theory of the
conduction of heat. If it were the same on the vortex atom theory
of gases as on the ordinary theory, then the distribution of velocities
would follow Maxwell’s law, as the values of the ratio of the coeffi-
cient of viscosity to the conductivity deduced from this law agree
fairly well with experiment. For this to be the case—

or p—6,

and the number of molecules which have the quantities 2 and #
between a2 and a+éa, B and B+6f8 would be proportional to—

eat) SO'dadB.

History of the Kew Observatory. 37

“The History of the Kew Observatory.” By RoBERT HENRY
Scort, M.A., F.R.S., Secretary to the Meteorological Council.
Received and read June 18, 18385.*

TxEr building, known by a misnomer of at least half a century’s
date as the Kew Observatory, while it is really situated at Richmond,
is erected on, or close to, a part of the foundations of a much earlier
structure, the old Carthusian Priory of Jesus of Bethlehem.

We learn from Crisp’s “Richmond” that “the ancient hamlet of
West Sheen occupied that portion of land now knownas the Richmond
Gardens, or Old Deer Park, and for the site of which hamlet or village
we may perhaps take with tolerable correctness the present Observa-
tory as the centre.”

The Observatory is situated upon a low mound, which is apparently
artificial. The central part of the building stands upon vaulting con-
structed of bricks, differmg in character from modern ‘‘stock” bricks,
being soft, red, thinner and narrower. Similar bricks are to be found
in the walls of Richmond Palace (Crisp, p. 123), and such have been
mainly used in the construction of the basement of the Observatory,
up to the stone course.

The basement is surrounded by three successive square rings of
vaulting, of which the innermost is 5 feet wide by 8 feet high, the
second 8 feet by 6 feet high, and the third and last 6 feet 6 inches by
5 feet high. This vaulting is constructed of bricks similar to those
used in the upper part of the building, which resemble the bricks of
the present day.

Crisp’s statement, given above, is not absolutely exact, for the tono-
graphical history of the plot of land bounded on the one side by
the bend of the river, and on the other by the present high road from
Richmond to Kew, the old “‘ Kew Lane” (see Fig. 3, p..46), is rather
complicated. Three separate domains can, however, be recognised—

1. Kew Gardens.
2. Richmond Gardens.
3. The Old Deer Park.

Of the three domains Nos. 1 and 2 were separated by a bridle path
called ‘‘ Love Lane,” which started from West Sheen Lane near
Richmond Green, and ran in a north and south direction to the Horse

* T am indebted to the kindness of several friends for much assistance in the
preparation of this history, particularly to Dr. E. W. Bond, of the British Museum,
Mr. W. Thiselton Dyer, F.R.S., and to the members of the staff of the Observatory.
—R. isle Ss.

38 | Mr. R. H. Scott.

Ferry at Brentford. Nos. 2 and 3 were quite distinct, though con-
tiguous to each other, whereas the above quotation from Crisp would
convey the idea that the two names, Richmond Gardens and the Old
Deer Park, were applied indiscriminately to the same area.

1. Kew Gardens lay to the east of Love Lane, they were the
gardens of Kew House, of which Frederick Prince of Wales (son of
George II) took a long lease from Mr. 8. Molyneux, his secretary, to
whom it had passed by his marriage with Lady Elizabeth, grand-niece
of Lord Capel.

Mr. Samuel Molyneux, F.R.S., had erected an observatory in a
wing of the house, in which he in the year 1725 made, with a
telescope of his own construction, in conjunction with Bradley, the
famous observations which, after his death, were continued by Bradley
and proved the Aberration of Light. This was the original and real
Kew Observatory.

Kew House was taken down in 1803, and the present sundial on
iis site erected by William IV, in 1832. The inscription on that
dial* hardly gives sufficient credit to Molyneux, to whom, however,
Bradley does full justice in Phil. Trans., Vol. XX XV, No. 406, p. 637.

2. Richmond Gardens were the gardens of Richmond Lodge,
formerly Ormonde House; of this area 37 acres, including 12 taken
from the Old Deer Park, are still in the occupation of the Royal
Family.

As Dr. Evans, in his ‘‘ Richmond and its Vicinity” (2nd Ed., 1825),
says (p. 12), ‘‘ Richmond Gardens existed and were in the zenith of their
popularity before Kew Gardens emerged into distinction.”

3. The Old Deer Park was the park of the same house, which stood
between it and the gardens.

As to the origin of Richmond Lodge, we have to go further back.
Richmond Palace (or the Palace of Sheen, as it was called before
Henry VII gave the village the name of Richmond) was the Sheen
Manor House. It was situated on the south-west side of Richmond
Green, near the river, and of it little remains save an archway with
the Tudor Arms and parts of the outer walls. Hdward I made ita
_ palace, and it continued so until the time of Charles I. Edward III,
Henry VII, and Elizabeth all died there. Under the Commonwealth
in 1650 it was sold, and after the Restoration was again in the hands
of the Crown, and it had been mostly pulled down in the seventeenth

* The inscription upon the dial is as follows :—‘“‘ On this spot, in 1725, the Rey.
James Bradley made the first observations which led to his two great discoveries—
the Aberration of Light and the Nutation of the Earth’s Axis. The telescope which
he used had been erected by Samuel Molyneux, Esq., in a house which afterwards
became a Royal residence, and was taken down in 1803. To perpetuate the memory
of so important a station, this dial was placed on it in 1832, by command of His
Most Gracious Majesty King William the Fourth.”

_ Mistory of the Kew Observatory. 39

century. Ona part of the site the Duke of Queensberry’s house was
built.

Richmond Lodge, which inits turn became the Palace of Richmond,
was apparently originally the Lodge of the Palace Park, the Old Deer
Park. It was situated near the present Observatory. The gardens
were in front of it, the park at the back.

As regards the position of the Priory, I have learnt from Dr. Bond,
of the British Museum, that all the recognised authorities agree in
_ placing the Carthusian Monastery to the north or the north-west of the
old Palace of Sheen. Crisp gives an engraving of the Monastery
before its demolition, and in an engraving of a panoramic view of
Richmond by Anthony van de Wyngaerde, dated 1562, a building
resembling Crisp’s view is shown in the site of the Priory indicated in
the subjoined map.

s Library, British Museu.

Cente of WSooF ect,

f)

oO
oS

SBN

6a og

a
gerd?

ape?

Sgp

ha
Nem
|e

AS 995

Fig. 1.—S1tE oF THE CARTHUSIAN Priory, Wrst SnereEn, crrcA 1730.

From a Portfolio marked K, 46, 16 h, in the Kin

40 Mr. R. H. Scott.

We now come to the original buildings on the actual site of ti.
Observatory, and we find in Crisp the following statement :-—

“It was in the year 1414 that Henry V, to expiate, as it has been
said, the crime by which his family had attained to the crown of
England, namely, the dethronement and murder of the unfortunate
Richard IJ, founded here a ‘ famous’ religious house for forty monks
of the Carthusian order, under the name of ‘ The House of Jesus of
Bethlehem at Sheen,’ by which name it was incorporated, and one
John Wydrington constituted the first prior.

‘‘ At the same time that Henry founded this noble priory, he like-
wise built and endowed another one at ‘Syon’ on the opposite bank
of the river, where the present Syon House now stands; this he
dedicated to St. Bridget, for sixty nuns of that order.”

Crisp says, ‘‘ There is in the British Museum an old work, in which
mention is made of these two ‘relygious houses,’ and that ‘it is there
stated they were founded for the reason that a constant succession of
holy exercises should be kept up night and day to the end of time, so
that when the devotions at one convent had been concluded, at the
other they should instantly begin.

‘Shakespeare had learned from the works of old chroniclers and
historians -the reasons given for the institution of these two (houses),
as in his ‘Henry V’ he makes the mang prior to the battle of
Agincourt, utter the following words :—

*“¢ Not to-day, O Lord,
O, not to-day think thou upon the fault
My father made in compassing the crown!
I Richard’s body have interred anew,
And on it have bestowed more contrite tears
Than from it issued forced drops of blood.
Five hundred poor I have in yearly pay,
Who twice a day their withered hands hold up
Toward Heaven, to pardon blood ; and I have built
Two chantries, where the sad and solemn priests
Still sing for Richard’s soul.’

“These buildings of Sheen and Syon were both of them stately
edifices, and were as nobly endowed.”
In 1541 the monastery, along with others, was suppressed.*

* Extract from Archeologia Soc. Antiq., Lond., vol. xx, App. pp. 575, 576 :—

“June 8, 1820. William Bray, Esq., Treasurer, exhibited to the Society an
impression from the seal of the Carthusian Priory, which formerly existed at Shene,
near Richmond, in Surrey ; appended to an indenture between John Bokyngham,
prior of that house, on the one hand, and John and Joan Rede, of Lewisham, in
Kent, on the other, respecting a garden or toft in East Greenwich, dated in the
22nd year of Henry the Sixth.

“The impression of the seal is small, of an oval shape, and has a representation of
the Adoration of the Shepherds in the area. At bottom are the arms of France and

History of the Kew Observatory. Al

Crisp says further: “It was in the year 1770* that the village or
hamlet of West Sheen with the ancient gateway forming the entrance
to, or rather part of, the priory, and eighteen houses with large pieces
of ground attached, were pulled down, and the entire site converted
into park or pasture land, as we now see it; but the antiquary to
whom the records of such institutions as this ‘ House of Jesus of
Bethlehem’ are so dear, while pondering over the changes which have
taken place in Richmond, and observing how little we now retain
of so much which has once existed here as the work of our Norman,
Plantagenet, and Tudor kings, can but cherish a feeling of the deepest
reeret at the total annihilation of the ancient priory buildings of
Henry V at Sheen.”

Richmond Lodge, or House (once occupied by Cardinal Wolsey),
which stood at no great distance from the present Observatory, had
been granted in 1707 by Queen Anne to the Duke of Ormonde, and
partly rebuilt by him, in the year 1708-9, on the site of an old
building which had hkewise borne the name of the Lodge for a long
period of years. On the impeachment of the duke in 1715, he hastily
left the country, and resided at Paris. Ormonde House was ap-
parently unfinished at the time. The Harl of Arran, his brother, who
purchased the property, then leased for the term of about ninety
years, sold the lease to the Prince of Wales, afterwards George II,
of whom, both before and after his succession to the throne, it was
a favourite place of residence, and even more particularly so of his
queen (Caroline). From this cause a numerous circle gathered in
and about the village and neighbourhood of Richmond, forming here
the court of the reigning monarch.

Here, in the garden appertaining to this lodge, took place the
interview between Queen Caroline and Jeannie Deans, after her
journey on foot from Hdinburgh to plead for the life of her sister
Effie, which has been so graphically and so touchingly described by
Sir Walter Scott in his “ Heart of Midlothian.”

There is one passage in the dialogue which has a connection with
the site of the Observatory, and that is Jeannie’s reply to the Queen
when addressed in the following words :—

“Stand up, young woman, and tell me what sort of a barbarous
people your countryfolk are, where child murder is become so common
as to require the restraint of laws like yours.”

‘Tf your Leddyship pleases, there are many places besides Scotland
where mithers are unkind to their ain flesh and blood.”

For as Crisp says, “It cannot be denied that the behaviour of
Caroline had been unnatural towards her son; she seems to have

England quarterly. The inscription round, when read at length, is—Sigillum Domus
Shesu Christi de Bethlem Ordinis Cartusiensis de Shene.”
* 1769, Evans.

4? Mr. R. H. Scott.

hated him thoroughly and intensely—slighted his young and amiable
wife—sided with his father, who upon all occasions behaved towards
him with harshness and severity; and when on her deathbed the
prince importuned to be allowed to see her, and sent her a most
affectionate message, refused to have him admitted to her presence.”
And therefore “of this famous Richmond Lodge, its magnificent
gardens, the statuary and the numerous and singular buildings with
which the Queen of George II had at such an extraordinary outlay
enriched the place, the remains of the ancient monastery of Sheen,
the large and embattled Gothic entrance, and the numerous houses
still appertaining to the hamlet—we have now not a vestige left.”
For ‘‘a few years after the accession of George III, the public, more
especially of Richmond and Kew, were surprised to learn that it was
His Majesty’s intention to pull down the whole of the buildings and
convert the estate into a large pasturage for cattle, which intention
was duly carried out.”

“It was at the time asserted, and in that assertion there is no
doubt much truth, that the young King so detested the memory of
his grandmother, Queen Caroline, so cherished a recollection of the
unnatural behaviour which she had always shown towards his late
father, Frederick, Prince of Wales, that he took an earnest pleasure
in destroying all that she had erected, or on which her taste and
resources had been expended.”

To return to the topographical description of the property. The
Brentford Horse Ferry was superseded by the erection of the first
Kew Bridge in 1759.

In 1765 ‘cee III obtained an Act (6 George III) io the shutting
up of Love Lane, undertaking in return to maintain Kew Lane, the
present high road from eaeeeenel to Kew Bridge. This Act was
apparently ineffective, for a further one was passed in 1784 (25 George
WUD

The Palace at Kew was the residence of Augusta Princess of Wales,
mother of George III, and the Observatory attached to it fell
into disuse. Accordingly, when the Transit of Venus occurred in
1769, facilities for observing it at the old Kew Observatory did
not exist. This was pointed out to King George III (apparently
by Dr. Demainbray), and he gave orders for the erection of an
Observatory in the Old Deer Park, the architect being Sir William
Chambers. This was known as the “ King’s Observatory,” and in a
paper* by the late Major-General Gibbes Rigaud, it is further styled
“the King’s Observatory at Kew.”’ Dr. Evans, however, calls it “The
Royal Observatory,’ and speaks of it as being at Richmond.

* “Dr. Demainbray and the King’s Observatory at Kew.’’—‘‘ The Observatory,”
October 2nd, 1882. .

History of the Kew Observatory. 45

The first Superintendent of the Observatory was Dr. Stephen
Charles Triboudet Demainbray, descended from parents who had fled
to London from France on the Revocation of the Edict of Nantes.
This gentleman, after a varied career as a lecturer on science in various
uniyersities and institutionsin these islands and in France, had settled
in London as instructor in science to the King before his accession,
and subsequently to Queen Charlotte. One point in his career
shows the estimation in which he was held in France. I gather
from General Rigaud’s paper, “In France (although not of the
religion of the country) he was received as an ‘ Associé Ordinaire ’
and member of the Royal Academy; the only instance of a declared
Protestant not being placed on the list termed ‘la Liste Etrangére.’ ”

Al_b

ria

Fie. 2.—THre KrEw OBSERVATORY FROM THE SOUTH-WEST.

Latitude 51° 28’ 6” N.
Longitude 0° 18’ 47” W.

When the new Observatory was finished, Dr. Demainbray adjusted
the instruments there in time to make the Transit observation, and
was its Superintendent until his death in 1782.

George III frequently attended at the Observatory, and procured
the best clocks and watches that could be made and placed them
in the Observatory, so that by daily observations of the sun when
passing the meridian, the time was regulated, and for many years
the accurate time for the regulation of the clocks in both Houses of
Parliament, at the Horse Guards, St. James’s, and elsewhere, was taken
from the King’s Observatory, before the accommodation was so well
and publicly afforded as it is at present from the Royal Observatory
at Greenwich. The clock which was the principal timekeeper at the

4A Mr. R. H. Scott.

Observatory is now at the Patent Museum, South Kensington (No.
14.26), and is going well. It bears the following inscription :-—

“This clock was made by Benjamin Vulliamy, Clock-Maker to
the King, for his Majesty George III, by whom it was used in his
private observatory at Kew. It was successively the property of
their Majesties George IV and William IV, of H.R.H. The duke of
Sussex, and of their Majesties Ernest, King of Hanover, and George,
King of Hanover, by whom it was given to Frances Moulton, widow of
Benjamin Lewis Vulliamy, eldest son of the maker, April 18th, 1854.”

His Majesty King George III, with the assistance of Dr. Demain-
bray, and his son the Rev. Stephen Demainbray (who held and
superintended the Observatory, as the astronomer, for upwards of
fifty-eight years after his father’s death) procured a large collection
of instruments, models, &c., besides a large apparatus for experiments
in all branches of natural philosophy, as also a very valuable natural
history collection. In addition to these, there was a collection of
minerals from the Hartz mines; but these were afterwards given by
King George IV to the British Museum.

The Observatory was for many years an object of great interest to
King George III, and the Rev. S. Demainbray was for a length of
time the teacher of the younger members of the King’s family, who
attended at the Observatory for his lectures on astronomy, electricity,
&c. King William IV also took great interest in the Observatory, and
frequently visited it. —

At the time of the transfer of the Observatory to the British
Association, Mr. 8. Demainbray retired on a pension, and he died in
July, 1854, at the age of ninety-five years.

During the latter part of the fifty-eight years in which he super-
intended the Observatory he was assisted by his nephew, Stephen Peter
Rigaud, Hsq., Savilian Professor of Astronomy at Oxford, and Radcliffe
Observer. This gentleman took charge of the Observatory during
the Oxford vacations, and thus enabled his uncle to reside during
those periods on his living in Wiltshire. The King’s Observatory
lasted, therefore, for seventy-one years, 7.e., from 1769 to 1840.

The Observatory itself was at one time in charge of a curator
named John Little, who was hanged in 1795 for the murder of two
old people in Richmond to whom he owed money, and who was
strongly suspected of having murdered a carpenter named Stroud,
who was discovered in the principal or octagon room of the Observa-
tory, the body lying under an iron vice. The St. James’s: Chronicle,
in August, 1795, in giving an account of Little’s execution, says, “‘ from
his civil deportment he was in general the only attendant on His
Majesty when he walked in the gardens.” The inquest on Stroud
at a previous date had resulted in a verdict of accidental death.

We find in a French book, Simond’s ‘‘ Voyage en Angleterre,” 8vo,

History of the Kew Observatory. 45

Paris, 1817, the account of an amusing episode in the astronomical
studies of George III during the later years of his life.

EXTRACT FROM SIMOND’s “‘ VoYAGE EN ANGLETERRE.” Paris, 8vo, 1817.

“Le roi aime l’astronomie, et a un Observatoire dans un petit pare
a Richmond, appelé ‘‘The King’s Paddock.” Ily aun grand télescope
de Herschel; un instrument des passages (transit) de huit pieds de
long, a travers lequel nous observames passant le meridien; un
instrument vertical de douze pieds, pour les observations au zenith:
un mural de huit pieds de rayon; un télescope equatorial, et plusieurs
autres instrumens moins considerables ; quelques modeéles de machines,
entre autres, une pour déterminer la pression latérale des votes;
une collection de mineraux, et un cabinet d’instrumens de physique.

“Sa Majesté étant venue a l’Observatoire, il y a quelques années,
pour observer une occultation de planétes, un daim poursuivi de
Windsor, traversa la riviére, franchit les palissades, suivi de toute la
meute, et vint se laisser prendre au pied de Observatoire, précisément
au moment de |’observation.

“‘Je demandai si l’attention de Sa Majesté s’était montrée supe-
rieure a cette interruption. On me répondit qu’un nuage, malheureuse-
ment survenu précisément au méme instant, avait rendu l’observation
impossible, et qu’autrement rien n’aurait pu l’en distraire.”’

The following would appear to be a correct account of the incident
somewhat romantically treated in the above, as it was narrated by the
late Sir James South to Dr. Balfour Stewart :—

One day Sir James was at the Observatory with the King (George
IIT) when they saw the stag hunt from Windsor approaching, and
ascended to the roof to watch it. Concealed by the parapet His Majesty
pointed out to Sir James the different gentlemen following the hounds,
and at the royal dinner in the evening the King created considerable
amusement by assigning to the guests the relative places they each
occupied in the hunt, as they were unable to imagine what position of
vantage His Majesty had occupied during the proceedings.

With this the record of tlie first period of the Observatory comes to
a close, and the building passed into the management of the British
Association for the Advancement of Science, for the space of thirty
years, till August 1871. The negotiations, which were carried out in
connection with the establishment by H.M.’s Commissioners of
Woods and Forests, in the first instance with the Royal Society, and
in the second with the British Association, cannot be better described
than in the following Memorandum drawn up in 1871 by Sir Charles
Wheatstone, who himself, with Sir Edward Sabine and Mr. J. P.
Gassiot, was among the original subscribers to the undertaking in
1842. The same three gentlemen, as Members of the Committee,

46 SMe BBL eee.

continued their active superintendence of the Observatory during the
whole period of its connection with the British Association.

Tt will be seen that throughout this memorandum it is termed the
Kew Observatory in all official documents.

THE ROYAL GARDENS

(ARBORETUM) -

Fig. 3.—THE Krw OBSERVATORY AND VICINITY, 1885.

1. The Observatory and Garden. 7. St. John’s Church.

2. Syon House. 8. Richmond Station (Old).
3. The Queen’s Cottage. 9. i Pa (New).
4. The Pagoda. 10. Richmond Green.

5. The Lion Gate. 11. Richmond Palace (Site of).
6. The Entrance to the Observatory | 12. Richmond Bridge.

(Fuller's Gate).

History of the Kew Observatory. AT

HISTORICAL REMARKS BY SIR CHARLES WHEATSTONE.

In 1841 the Government came to the determination of no longer
keeping up the Observatory and Museum established by His Majesty
George the Third in the Old Deer Park at Richmond. In consequence.
of this resolution, the Curator and the Reader in Natural Philosophy,
who had for many years been attached to the building, were pensioned
off, and the valuable contents were distributed to the Armagh Obser-
vatory, the British Museum, King’s College, london, the College of
Surgeons, and some members of the Royal Family. The building
being thus dismantled and vacant, was applied for by the Council of
the Royal Society, on the recommendation of the Committee of
Physics and Meteorology, as appears from the following Minutes of
June 24, 1841 :—

‘Mr. Daniell reported, on the part of the Committee of Physics,
that they had passed the following resolution, viz.:—

“<The Committee, understanding that the building formerly
occupied as the Observatory at Kew is disposable, and may be had if
applied for, and having frequently experienced the want of such a
pbuilding for various scientific purposes, recommend to the Council
that an application be made to secure it for the Royal Society.’

“‘ Resolved,—That this recommendation be adopted; and that the
President be requested to make apeaiion to the proper quar ler for
the possession of the building in question.” ;

An application was accordingly made, and the possession granted
to the Royal Society; consequent on which the following resolution
was recorded on November the 11th of the same year :—

‘“Resolved,—That it be referred to the Committee of Physics to
consider and report to the Council to what specific scientific purposes
it would be desirable to appropriate the building formerly occupied by
the Observatory at Kew, in case of a grant of that building being
made to the Society by the Government; and what would be the
probable annual expense of applying it to such purposes.”’

On January the 10th, 1842, a communication was received by the
Secretary from the Office of Woods and Forests, requesting to be
informed when the Society would be prepared to take possession of
the building, as it had long since been cleared and ready to be
delivered up when required. The following resolution was thereon
recorded :—

‘‘ That the Secretary inform Mr. Milne, in answer to his letter, that
the Council having referred the matter in question to the considera-
tion of a Committee, beg to defer their answer till they receive the
report of that Committee, which they expect will soon be prepared.”

A8 Mr. R. H. Scott.

The report called for was read on February 10, 1842, and was as
follows :—

‘‘ The Sub-Committee report that, from the peculiar restrictions as
to access and inhabitancy, and other circumstances affecting the pro-
posed grant of the Kew Observatory to the Royal Society, they do not
consider that any regular and systematic course of physical observa-
tions at present devisable could be therein advantageously made by
the Society, or by any observer under their immediate appointment
and direction; but that nevertheless they consider that such a build-
ing so held might, if oceupied for safe custody by a proper person, be
highly available for many useful scientific purposes, which have long
been desiderata as part of the establishment at Somerset House; such
as, among others, the following :—

“1. Asa depository of instruments and other property of the Royal
Society, either not in use, or for which, for general or special reasons,
Somerset House may not be regarded by the Council as an advan-
tageuus place of deposit.

“2. As a station for occasional observation and comparison of
- pendulums, either returned from abroad, or about to proceed on
voyages, as also for affording foreigners wishing to compare pendulums
an opportunity of so doing.

“3. As a station for trial and comparison of magnetical apparatus,
and affording to observers desirous of acquiring a knowledge of the
nature and use of such apparatus, an opportunity for conveniently
doing so, and of obtaining a practical knowledge of the system of
maenetical observation recommended by the Society.

“4. As a station in which many occasional phenomena might be
advantageously observed by Fellows of the Society, or others, on
permission obtained from the President and Council, such as, for
example, concerted observations of shooting-stars, &c., or in which the
phenomena of what has been called ‘magnetic storms,’ or unusual mag-
netic disturbances might be witnessed, and their particulars attended
to by observers desirous of so doing, without interfering with obser-
vations regularly in progress at official stations, or with a view to
other circumstances in their phenomena than what may be ordinarily
observed at such stations; it being considered that such ‘storms’ are
sometimes of considerable duration, and may become known to exist
by direct communication from Greenwich or other regular observing
station.

“5. As a proper place for the trial of physical apparatus and
occasional physical experiments, for which no convenience exists at
Somerset House; such as may either be proposed by scientific
committees, or be undertaken by individuals, on permission duly
obtained from the President and Council.

‘6, As a proper place for the comparison of standards of every

History of the Kew Observatory. AQ

description in which general steadiness of temperature and stracture,
light, retirement, and security may be especially needed.

‘“As regards the probable cost of such an establishment to the
Society, it appears to include essentially :—Ist, the wages of a man
who should reside in the house, and take care of it; 2nd, such repairs
as may from time to time be required, should Government not take
on itself the charge of maintenance of the structure; 3rd, the interest
of money expended in fitting it for the purposes in view; and 4th, the
taxes and rates which may be incident on its occupation.

“ As to the first of these items, the Sub-Committee consider. that
an amount of 10s. 6d. per week, 27/1. 6s. per annum, would suffice
with fuel. |

“The building has been represented to them.as being in excellent
repair, and not to have cost 5/. annually for some time in its main-
tenance in that state; nor are they without reason to hope that
such an understanding might be had with the proper authorities as
would strike out this item in future.

“Tt has also been stated to them, that among the fixtures of the
buildings are included an ample provision of glass cases and other
receptacles well adapted for the preservation of instruments and books,
and which have heretofore served for the preservation of the very
valuable collections lately presented by Her Majesty to King’s
Uollege, London, and which would materially alleviate the charges
incidental on this head. )

“J. F. W. Herscuet.
“C. WHEATSTONE.
‘“‘ HDWARD SABINS.”

On the 10th of March, however, the Council of the Royal Society
rejected the gift they had previously solicited, in the following
resolution :— 2

‘“‘Resolved,—That, on full consideration of the report of the
Committee of Physics, including Meteorology, presented at the last
meeting of the Council, it does not appear to the Council to be
expedient for the Society to occupy the Observatory at Kew; and
that the Treasurer be requested to make known this decision to the
Commissioners of the Woods and Forests, expressing at the same
time their thanks for the courtesy and attention paid to the suggestion
of the Council on the subject.”

The building having thus become again unappropriated, a number
of Fellows of the Royal Society and Members of the British Associa-
tion, desirous that it should be retained for the purposes of science,
recommended that an application should be made for it in the name
of the British Association, and entered into a subscription for the
purpose of promoting the objects stated in the following prospectus.

YOL. XXXIX. E

50 ” Mee’ RAED eoee

The subscription was headed by donations of 15J. each from the
Marquis of Northampton and Lord Francis Egerton as Presidents
respectively of the Royal Society and the British Association ; and the
following gentlemen entered their names for sums varying from 5/.
to 101. each :—

Sir John Herschel, Sir John Lubbock, Sir’Charles Lemon, Sir
H. de la Beche, Sir John Rennie, Lieut.-Col. Sabine, Capt. Chapman,
The Rev. Dr. Buckland, Dr. Arnott, Dr. Fitton, Prof. Daniell, Prof.
Graham, Prof. M‘Cullagh, T.C.D., Prof. Wheatstone, R. I. Murchison,
Esq., J. Davies Gilbert, Esq., H. F. Talbot, Esq., J. Taylor, Esq.,
G. Rennie, Esq., J. Evans, Esq., J. P. Gassiot, Hsq., and R. Napier, Esq.

The views of these gentlemen were expressed as follows :—

‘“‘ Tt has frequently been the subject of regret that there does not
exist in this country any of those facilities for the encouragement and
advancement of physical science which have been so liberally afforded
by the Governments of other nations.

“‘ The Continental philosopher, when he for the first time visits our
shores, finds to his great surprise that in the metropolis of this great
empire there is not one collection of physical instruments which can
afford the slightest idea of the present advanced state of scientific
investigation. A few of our establishments for public instruction,
indeed, are provided with apparatus for exhibiting the most usual
results of experimental philosophy to classes of learners at public
lectures, and there are two or three public exhibitions at which
some of the most popular and practical results are shown, but the
most valuable mstruments of scientific researches, particularly those
by means of which alone accurate quantitative results can be obtained,
are nowhere to be found. It is to be hoped that ere many years have
passed a National Physical Museum worthy of the name may be
established in London, but as this is an object which we cannot expect
to see reilized by the private co-operation of individuals, it is proposed
to carry into present effect a plan of a more limited nature, which will
supply some of the most obvious and urgent existing wants otherwise
unprovided for, and which does not seem beyond our means of
accomplishing.

“Tt is proposed to establish, in connexion with the British Associa-
tion, a Physical Observatory. The useful purposes to which it is
intended to apply the Building at Kew, to be placed at the disposal of
the British Association, are, among others, the following :—

‘J. It will be a repository for, and place for occasional observation
and comparison of the various instruments which the recent discoveries
in physical science have suggested for improving our knowledge of
meteorology, &c., in order that their relative advantages and defects
may be ascertained.

“A creat number of very ingenious instruments have been invented

History of the Kew Observatory. 51

on the Continent within the last twenty years, which are practically
unknown in this country, but which, if properly understood, verified,
and brought into use, would lead to valuable results.

“At the present moment a most important and widely extended
series of simultaneous observations in different parts of the world is
being carried out, and to this object the British Government and Hast
India Company have munificently contributed. With the exception
of the magnetical instruments, none are at present employed for these
observations but those which have been long kuown and verified ; this
has arisen from want of proper knowledge of the means of coustruct-
ing, using, and interpreting the results of the new instruments. Did
we possess this knowledge, the harvest to be gained from the system
of combined observations, now in operation, might be more than
doubled, with scarcely any increase of expense.

“2. A repository and station for trial of new instruments, having
the same objects as the above in view, which may be proposed in this
country. Among instruments which have been proposed, and which
will probably not be constructed and brought into use without the
assistance which an Institution like this alone can afford, may be men-
tioned: a universal meteorograph, which will accurately record half-
hourly indications of various meteorological instruments, dispensing
entirely with the attendance of an observer; an apparatus for record-
ing the direction and intensity of the wind simultaneously at various
heights above the earth’s surface; an apparatus for telegraphing the
indications of meteorological instruments carried up in balloons or by
kites, to an observer at the earth’s surface.

“3. As a station to which persons, willing to become coadjutors in
the system of consentaneous observations, may bring their instruments
for the purpose of comparison with the standard instruments there
deposited. Attention need not be called to the increased value of
observations made with instruments thus properly compared. -

“4. As the depository of a complete set of the magnetic instru-
ments at present in use in the various magnetic observatories, in order
that any person desirous of so doing may understand their construc-
tion and acquire their use. The only magnetic observatory in Hngland
is ab Greenwich, and the instruments, being in constant use, cannot be
employed for the purposes here mentioned.

‘““5. A complete series of apparatus for experiments on atmospheric
electricity. For such investigation the locality is peculiarly adapted.
Nothing of the kind at present exists in England, and yet there is no
subject in meteorological science for which so much remains to be done.

“6. One of the rooms to be fitted up as an optical chamber with a
Heliostat, Fraunhofer’s prismatic telescope, photometers, d&c., prin-
cipally for the purposes of optical astronomy, a subject at present

totally neglected.
E 2

“on
i)

Mr. R. H. Scott.

“7. As complete a collection as can be gathered together of the .
measuring instruments employed in the various branches of physical
science, for the purpose of obtaining accurate quantitative results.

“The facilities which such a collection would give to original
investigation do not at present exist in this country.

“Tt is not at present recommended that any expenditure of the
funds should be made for apparatus intended merely to exhibit the
necessary consequences of established laws.”’

A successful application was then made by the authorities of the
British Association for the possession of the building; and at the
Meeting at Manchester in June, 1842, the President of the year, Lord
Francis Egerton, thus alluded to this gift of the Government in his
opening address :—

‘““T have been speaking of matters for some time past in progress
and notorious to all who have taken an interest in your proceedings.
They are gratifying as proofs that the impulse of this Society has
been communicated and felt in high quarters. It is surely desirable
that under any form of Government, the collective science of a country
should be on the most amicable footing with the depositories of
its power; free indeed from undue control and interference, not
dangling in antechambers, nor wiping the dust from the palace stair-
cases, uncontaminated by the passions and influences with which
statesmen have to deal, but. enjoying its good will and favour,
receiving and requiting with usury its assistance on fitting occasions,
and organized in such a manner as to afford reference and advice
on topics with respect to which they may be required. *** The
most recent instance [ cannot omit—I mean the important accession
to the means of this Society of a fixed position, a place for deposit,
regulation, and comparison of instruments, and for many more
purposes than I could name, perbaps even more than are yet contem-
plated, in the Observatory at Kew. This building was standing useless.
The Council of the Association approached the throne with a petition
that they might occupy it, and I am happy to say that the sceptre
was gracefully held towards them; and I think this transaction a
fair instance of that species of connexion between science and govern-
ment which I hope may always be cultivated in this country. I am
informed that the purposes to which this building is readily and
immediately applicable, are of an importance which none but men
advanced in science can appreciate. You will hear further of them in
the Committee Recommendations.” CoOWE

. History of the Kew Observatory. 53

KEW OBSERVATORY UNDER THE BRITISH
ASSOCIATION.

This period naturally divides itself into two intervals, the first of
ten years, 1842 to 1851, when Mr. (afterwards Sir Francis) Ronalds,
F.R.S., acted as Honorary Superintendent. In 1852, the second
period of twenty years commenced, and the Kew Committee first
appeared as actually taking control of the establishment, with Mr.
John Welsh, F.R.S., as Superintendent. The Committee had been
formally constituted in 1849, as shown by the following extract :—

Kextract from the First Minute Book of the Kew Committee of the
British Association.

“ At a Meeting of the Council of the British Association, held at
6, Queen Street Place, London, October 25, 1849—

‘* Present :

Sir Charles Malcolm, K.C.B., in the Chair, succeeded by Robert
Hutton, Esq. ;

W. J. Hamilton, Esq.; | Dr. Forbes Royle;
Robert Hutton, Hsq. ; Lieut.-Colonel Sabine ;
Francis Ronalds, Esq. ; John Taylor, Esq. ;

It was resolved that the following gentlemen be named as a Com-
mittee for visiting and exercising a general superintendence over
the experiments and observations to be made at Kew; and that the
Council are persuaded that the Members of the Committee will render
a good service to science, and will entitle themselves to the cordial
thanks of the British Association, if they will regard themselves as
Members of a real working Committee :—

Sir J. W. Herschel, Bart. ;

J. P. Gassiot, Esq. ;

Colonel Reid, Royal Engineers;

Colonel Sykes ;

Charles Wheatstone, Esq. ;
in addition to the President, Trustees, and Officers of the Association.”

The first Report of the Committee, signed by Mr. Gassiot as

Chairman, was that for 1853. In 1859 Mr. Welsh died, and was
succeeded by Mr. Balfour Stewart, F.R.S., who held office for twelve
years, up to August, 1871, when the connection of the Observatory
with the Association was terminated, as will be explained sub-
sequently.

The first notice we find in the Reports of the Association as to

54 Mr. R. H. Scott.

the administration of the Observatory was the following resolution
adopted at the Manchester Meeting in June, 1842 :—

‘‘That Professor Wheatstone, Professor Daniell, and Mr. Snow
Harris be-a Committee for constructing a self-recording
meteorological apparatus to be employed in the building at
Kew, recently placed by Her Majesty the Queen at the dis-
posal of the British Association, with the sum of 501. at their
disposal for the purpose.

‘‘ Also that the sum of 2001. be placed at the disposal of the
Council for upholding the establishment in the Kew Observa-
tory.”

In the volume for the next year, 1843, we have the Report of a
Committee, consisting of Professor Wheatstone, Mr. Hutton, the
General Secretary (Colonel Sabine), and Treasurer (Mr. John Taylor),
appointed by the Council to superintend the establishment of meteoro-
logical observations at the Kew Observatory. And at the close of
the first year the Council report the establishment of the following
registries, V1Z. :—

‘‘], An ordinary meteorological record with standard instruments
made by Mr. Galloway under the superintendence of Professor
W heatstone.

“2. A meteorological record with self-registering instruments on
a new construction by Professor Wheatstone.

“3. A record of the electrical state of the atmosphere.

‘“Mr. Ronalds’ name now appears in connexion with the electrical
records, and for the next nine years he acted as Hon. Superintendent.

It is evident that the action of the Council in taking charge of the
Observatory was criticised at an early date, for from the Report of
the Meeting at Southampton, 1846, we learn that the expediency of
discontinuing Kew had been referred to the Council at the previous
Meeting, as will be seen by the following extract of a Report from
the Council presented to the general Committee, September 9, 1846.

The General Committee at Cambridge having passed a resolution—

“That it be referred to the Council to take into consideration
before the next Meeting of the Association the expediency of
discontinuing the Kew Observatory,”

the Council appointed a Committee, consisting of the President (Sir
John Herschel), the Dean of Ely, the Astronomer Royal, Professors
Graham and Wheatstone, and Lieut.-Colonel Sabine, to collect infor-
mation on the scientific purposes which the Kew Observatory has
served, and on its general usefulness to science and to the Association,
from whom they received the following Report :—

“ Kew Observatory, May 7, 1846. Present, Sir J. F. W. Herschel,

History of the Kew Observatory. ays)

Bart., the Astronomer Royal, Professors Graham and Wheatstone, and
Lieut.-Col. Sabine.

“ After an attentive examination of the present state of the estab-
lishment and of other matters connected therewith, the following
resolutions were unanimously adopted, viz. :—

“That it be reeommended to the General Committee that the estab-
lishment at Kew, the occupancy of which has been granted by Her
Majesty to the British Association, be maintained in its present state
of efficiency.

“1. Because it affords, at a very inconsiderable expense, a local
habitation to the Association, and a convenient depository for its
books, manuscripts, and apparatus.

“2. Because it has afforded to Members of the Association the means
of prosecuting many physical inquiries which otherwise would not have
been entered upon.

“3. Because the establishment has already become a point of interest
to scientific foreigners, several of whom have visited it.

“4. Because the grant of the occupancy of the building by Her
Majesty, at the earnest request of the British Association, is an instance
of Her Majesty’s interest in and approval of the objects of the
Association.

‘5. Because if the Association at the present time relinquish the
establishment it will probably never again be available for the
purposes of science.

“6. Because it appears, both from the publications of the British
Association and from the records in progress at the establishment, that
a great amount of electrical and meteorological observation has been
and continues to be made, and that a systematic inquiry into the
intricate subject of atmospheric electricity has been carried out by
Mr. Ronalds, which has been productive of very material improvements
in that subject, and has in effect furnished the model of the processes
conducted at the Royal Observatory ; and because these inquiries are
still in progress under local circumstances extremely favourable.

‘7. Because other inquiries into the working of self-registering
apparatus, both meteorological and magnetical, are in actual progress
at the establishment, and there is a distinct prospect of the facilities
it affords being speedily much more largely profited by.

“8. Because the access to the Observatory from London to Members
of the Association will shortly be greatly improved by railroads, and
because the local facilities and conveniences of the establishment have
been very greatly enhanced by alterations in its relations to the
Commissioners of Woods and Forests.

Signed. “J. F. W. Herschel, Chairman.”

In presenting this Report to the General Committee the Council

56 Mr. R. H. Scott.

requests that it may be understood to convey also the opinion of the
Council.

At this early period much of Mr. Ronalds’ attention was directed
to the subject of atmospheric electricity, and in this investigation he
was assisted by Mr. W. Radcliff Birt. At the same time the Hon.
Superintendent was far from neglectful of other branches of physical
research, and: he devoted much of his rare mechanical energy to the
invention and perfecting of the photographic processes for the registra-
tion of meteorology and terrestrial magnetism, with which the name
of the Kew Observatory has been permanently associated.

In the course of the year 1850 magnetic observations were com-
menced with instruments provided by Lieut.-Colonel Sabine, and Mr.
John Welsh was appointed by the Committee as Assistant, Mr. Birt
having left the Observatory; and in the following year we notice the
first commencement of the Verification Department, which has
subsequently become such an important feature of the Kew opera-
tions—the purchase of a standard thermometer by Regnault, with the
intention of employing the latter instrument in the verification of
thermometers made by artists in this country—and the procuring of
M. Regnault’s apparatus for calibrating and graduating thermometer
tubes.

In 1852 the verification work had fairly started, as well as the
making of standard thermometers. Mr. Welsh also had made two
ascents in a balloon, for the determination of the temperature and
hygrometric condition of the air at different elevations, before the date
of the British Association Meeting.

In the course of this year Mr. Ronalds left the Observatory to
reside on the Continent, and accordingly from this date Mr. Welsh is
to be regarded as Superintendent of the Observatory, the first or
preliminary stage of the Observatory having come to an end.

In 1853, as already stated, appeared the first Kew Report, signed
by Mr. Gassiot as Chairman of the Kew Committee, and in the next
year, 1854, we learn that the best form of barometers and thermo-
meters for the use of the Mercantile Marine had been decided on by
the Kew Committee at the request of the Board of Trade, and that
Mr. Welsh had experimentally tested the marine barometers in a
- voyage to Leith and back, and in one to and from the Channel Islands.

Also that Sir J. Herschel had suggested the importance of
obtaining daily photographic pictures of the sun’s disk, and that
Mr. Warren de la Rue having reported that the probable cost would
not exceed 150/., this sum had been procured from the Donation Fund
of the Royal Society.

In the same year Robert Beckley was engaged as machinist, on the
recommendation of Mr. de la Rue. Two acres of ground were also

Eistory of the Kew Observatory. 57

secured, contiguous to the Observatory. Welsh’s standard barometer
dates from 1855, and the introduction of gas to the Observatory from
the next year. In the same year Mr. Balfour Stewart was engaged
as Assistant, but he only remained for a brief period in that capacity,
for in 1857 he was succeeded by Mr. Charles Chambers.

In 1856 Mr. Beckley’s modification of Robinson’s anemometer
was submitted to the Committee, and also a series of monthly
determinations of dip and horizontal force was commenced with
instruments provided by General Sabine from his Department at
Woolwich.

‘The next important event to be chronicled is that the following
Memorandum relative to the re-establishment of self-recording
' magnetic instruments at the Kew Observatory was submitted to
_ the Committee by General Sabine on July 22, 1856 :— :

“1. The decennial period in the solar magnetic variations, and its
coincidence with a similar period in the frequency and amount of
the solar spots, appear to be highly deserving of attention in an
Observatory established, as Kew is, for physical researches.

“2. There is reason to suppose that the permanency and regularity
in the occurrence of the decennial period in the magnetic variations,
and its coincidence with the periodic variation of the solar spots,
might be effectually and satisfactorily tested by observations of both
classes of phenomena at the alternate periods of maximum and
minimum, say, for example, in 1857 and 1858 as the anticipated .
period of maximum, and in 1863 and 1864 as the anticipated period
of minimum, and so forth.

“3. The apparatus constructing under the superintendence of
Mr. de la Rue will, it is hoped, fully meet the requirements of the
research in respect of the solar spots.

‘4. Since the time when the magnetic self-recording instruments
belonging to the Kew Observatory were constructed under the direc-
tion of Mr. Ronalds, very considerable improvements have been made
in the art of photography, and the six months’ trial which was made
by Mr. Welsh of Mr. Ronalds’s instruments has led in several other
respects to suggestions for improvements which could not but be
expected to be required in instruments of so novel a kind, while at
the same time the six months’ trial referred to has placed beyond
doubt the sufficiency of a properly conducted research by means of
self-recording instruments, for the examination of the solar magnetic
variations.”

The Committee authorized Mr. Welsh to proceed with the construc-
tion of the instruments, which were completed at an expense not
exceeding 250/., derived from the Government Grant Fund, the
instruments remaining at Kew at the disposition of the Council of
the Royal Society.

58 Mr. R. H. Scott.

In the same year the Kew Heliograph was completed, and it was
arranged that Mr. Welsh should undertake the Magnetic Survey of
Scotland, the results of which operation were published by Mr. Stewart
in the Report of the British Association for 1859. In 1858 also Mr.
G. M. Whipple was engaged as a boy.

In 1859 Mr. Welsh died, and was succeeded by Mr. Balfour Stewart.
At this date an instrument had been devised at the Observatory for
tabulating the values of the magnetic elements from the magneto-
grams, and as the staff of assistants at the Observatory was not
sufficiently large to undertake these tabulations, General Sabine
undertook to have the results tabulated at Woolwich for every hour.

In 1860 the Kew Photoheliograph was taken by Mr. de la Rue,
mainly at his own expense, to Spain, for employment at the Solar
Eclipse on July 18th. Its use was a complete success, and proved
that the red prominences belonged to the sun.

In 1861 Sir W. Thomson’s Electrograph was bie into regular
operation at Kew, and an account of two years’ work with it was
prepared and submitted to the Royal Society by Professor J. D.
Hverett in 1868.

In 1862, at the suggestion of Admiral Fitz Roy, who agreed on the
part of the Meteorological Department of the Board of Trade to bear
the expense incurred, the Barograph designed by Mr. Ronalds was
fitted up, and has been from that date kept in constant operation.

It was also reported that as on account of the inadequate strength
of the staff of assistants it was not possible to work the Photo-Helio-
graph at Kew, it had been in operation at Mr. de la Rue’s observa-
tory, at Cranford, since February 7th.» The instrument remained in
Mr. de la Rue’s hands for twelve months, when it was re-erected at
Kew.

In 1862 Mr. Stewart communicated to the Royal Society an account
of some experiments made at Kew in order to determine the increase
between 32° Fahr. and 212° Fahr. of the elasticity of dry atmospheric
air the volume of which remains constant; and also of others to
determine the freezing-point of mercury.

In the next year Mr. Chambers left the Observatory to enter the
India Telegraph Service, and eventually to take charge of the Colaba
Observatory, Bombay; his place, as Magnetic Assistant, being filled
by Mr. Whipple.

In 1865 we hear that the Indian Government having decided that
pendulum observations should be made in India, Col. Walker and
Capt. Basevi received instruction at Kew. A convenient room for
pendulum observations was likewise fitted up in the Observatory, the
expense being defrayed from the Government-Grant Fund of the
Royal Society ; and in this room preliminary observations were made
for determining the constants of the two pendulums about to be

Eistory of the Kew Observatory. 59

used in India. The observations were made by Mr. Loewy, and the
results communicated to the Royal Society.

In the same year it is reported that—(1) the solar spectrum was being
mapped by the spectroscope belonging to the Chairman (Mr. Gassiot),
and at his expense. All the measurements between D and H had been
made and completely verified, and a map of this region in accordance
with these constructed; the investigation was continued until 1866, at
which time about three-fourths of the region between EH and F had
been mapped. And (2) that Hofrath Schwabe, of Dessau, had very
generously placed his valuable and extensive series of sun-pictures
at the disposal of the Royal Astronomical Society for the immediate
use of the Kew Observatory. The enumeration of spots on the
principle followed by Herr Schwabe was then commenced and has
been continued up to the present time.

1865 also witnessed the commencement of an investigation, which
was continued at intervals for several years, but which cannot be said
to have led to definite results as yet. It is thus introduced :—

“At the joint suggestion of Professor Tait, of Edinburgh, and the
Superintendent, an ingenious apparatus has been constructed by Mr.
Beckley, by means of which a disk can be made to revolve im vacuo
with great velocity; and a short description of some experiments
performed by means of this instrument, with a view of ascertaining
whether visible as well as molecular motion is dissipated by a medium
pervading space, has been communicated to the Royal Society by the
Superintendent in conjunction with Professor Tait.”

In 1866 the completion of the Kew Photographic thermograph by
Mr. Beckley is announced, and in the same year the General Com-
mittee of the British Association adopted the following resolution :—

“That the Kew Committee be authorized to discuss and make
the necessary arrangements with the Board of Trade, should
any proposal be made respecting the superintendence, reduction,
and publication of meteorological observations, in accordance
with the recommendations of the Report of the Committee
appointed to consider certain questions relating to the Meteoro-
logical Department of the Board of Trade.”

This resolution initiated the close relationship between the Kew
Observatory and the Meteorological Office, of which the reorganiza-
tion was then in contemplation: a relationship which has materially
modified the course of operations at Kew Observatory in subsequent
years.

In 1866 the first set of results obtained from the heliograph were
published at the expense of Mr. de la Rue under the following title,
“Researches on Solar Physics,” by Messrs. Warren de la Rue, B.
Stewart, and B. Loewy; first series, “‘On the Nature of Sun-spots.”

60 Mr. R. H. Scott.

This was successively followed in 1867 by the Second Series, entitled
‘Researches on Solar Physics, Second Series, Area-measurements
of sun-spots observed by Mr. Carrington during the seven years
1854-60 inclusive, and deductions therefrom,” and in 1868 by
Appendix to the second series, “‘ On the Distribution in Heliographic
Latitudes of the Sun-spots observed by Carrington.” These papers
all appeared at Mr. de la Rue’s expense, and all bore the names of the
same authors.

Two papers were likewise communicated in 1868 to the Royal
Society by these gentlemen. The first is entitled ‘Researches on
Solar Physics, Heliographic Positions, and Areas of Sun-spots observed
with the Kew Photoheliograph during the years 1862 and 1863.” The
second, ‘‘ Account of some recent observations on Sun-spots made at the
Kew Observatory.” —

1867. In the Report of the Kew Committee for this year we have
a short account of what steps had been taken by Government with
reference to Meteorology, ending with the names of the superintending
Meteorological Committee, and stating that on the 3rd of January this
Committee had appointed Mr. Balfour Stewart as its Secretary, on the
understanding that he should, with the concurrence of the Kew Com-
mittee of the British Association, retain his present office of Superin-
tendent of the Kew Observatory.

It was also proposed that Kew Observatory should become the
Central Observatory, at which all instruments used by or prepared for
the several observatories or stations connected with the Meteorological
Department should be verified, the entire expense attendant thereon;
or any future expense arising through the connexion of the Observa-
tory with the Meteorological Department, being paid from the funds
supplied by the latter, and not in any way from money subscribed by
the British Association. These proposals having been submitted to
the Kew Committee, they approved of the Kew Observatory being
regarded as the Central Observatory of the Meteorological Office,
and of Mr. Stewart’s holding the office of Secretary to the Scientific
Committee superintending that office.

In the same year we are informed that the magnetic curves produced
at Kew previously to the month of January, 1865, had all been
measured and reduced under the direction of General Sabine, by the
staff of his office at Woolwich; and the results of this reduction com-
municated by General Sabine to the Royal Society in a series of
memoirs.

In the course of this and the succeeding year the assistants at the
six outlying automatic observatories, in connection with the Meteoro-
logical Office, Aberdeen, Armagh, Falmouth, Glasgow, Stonyhurst,
and Valencia, received their training at Kew, while Mr. Stewart, with
the assistance of Mr. Beckley, personally superintended the ercction

History of the Kew Observatory. 61

of the instruments at the several stations. The Report for 1868
contains an account of the work done at Kew as the Central Observa-
tory of the Meteorological Committee, in which it is stated that this
work may be divided into four heads :—

(1) The arrangement of the self-recording meteorological instru-
ments, their verification at Kew, and erection at the
various stations.

(2) The arrangement of a system of tabulation from the
automatic records of these instruments.

(3) The arrangement of a system by means of which the
accuracy of the instruments themselves, and of their
tabulated records, may be secured.

(4) Work done at Kew as being itself one of the Observatories
of the Meteorological Committee.

In 1869 we learn inter alia that Mr. Beckley had devised his self-
recording rain gauge, an account of which was submitted to the
British Association at Exeter. At the close of the year, in October,
Dr. Stewart resigned the Secretaryship of the Meteorological Com-
mittee, and the relations between the Kew Committee and the
Meteorological Office were consequently modified.

62 Mr. R. H. Scott.

KEW OBSERVATORY UNDER THE ROYAL SOCIETY.

The letter from the Secretary of the British Association, com-
municating the Resolution of the Council of that body, which has
been given above, was taken into consideration by the Council of the
Royal Society on the 19th of January, 1871. At the Meeting of
the Council ou the 16th of March of the same year, a letter was read
from Mr. J. P. Gassiot, F.R.S., offering to the Royal Society an
immediate gift of securities, the proceeds of which were to be devoted
to the maintenance of a Central Magnetical and Physical Observatory
at Kew. The negotiations for the acceptance of this munificent offer
were carried to a successful issue during the ensuing months, and on
the 15th of June the following memorandum was entered on the
Council Minutes of the Royal Society :—

Memorandum of the general heads of the proposed Deed of Trust of
the Fund offered by Mr. Gassiot for maintaining the Kew Observatory
and carrying on the magnetic, meteorological, and physical observa-
tions there :—

‘‘ Securities representing 10,000/. are proposed to be given to the
Royal Society by J. P. Gassiot, Esq., F.R.S., upon trust, for the
purpose of assisting in carrying on and continuing magnetical and
meteorological observations with self-recording instruments, and any
other physical investigations as may from time to time be found practi-
cable and desirable, in the Kew Observatory, in the Old Deer Park,
at Richmond, Surrey, belonging to Her Majesty’s Government; or,
in the event of that Government at any time declining to continue
placing that building at the disposition of the Royal Society, then
in any other suitable building as the Council of the Royal Society
may determine.

‘‘The Observatory and the income of the Trust Fund are to be
under the entire control and management of a Committee to be from
time to time appointed by the Council, for the time being, of the
Royal Society.

“The services of such Committee (like those of the present Meteor-
ological Committee nominated at the request of Her Majesty’s
Government) are to be gratuitous.

“The income is to be paid to the Committee (to be by them applied
generally towards continuing and maintaining the Observatory and
providing the expenses of conducting the observations and investiga-
tions), also for any repairs to the Observatory building and premises,
or for repair or improvement of the present instruments, or for
providing new instruments, as the Committee may from time to time

History of the Kew Observatory. 63

deem expedient, and generally for carrying out the objects of the
Trust as may be from time to time determined by the Committee.

“‘An annual statement of receipts and expenditure is to be prepared
by the Committee with any report that the Committee may from
time to time deem to be desirable, and the same are to be presented
to the Royal Society, and the report is to be published in the
Proceedings of the Royal Society, or in such other form as the Council
may from time to time direct.

“Tf, by reason of the Kew Observatory, or any other such equivalent
Observatory being at any time discontinued, the observations should
cease to be recorded, and the investigations cease to be made for (say)
twelve consecutive months, the Trust Funds, with all accumulations
Gf any), are to be paid over to the person who shall, for the time
being, be, de facto, the Treasurer of the London Middle-Class School
incorporated by Royal Charter, dated 12th of June, 1866, by the
name of ‘the Corporation for Middle-Class Hducation in the Metro-
polis and suburbs thereof,” to the intent that the same may be applied
for the use and benefit of that Corporation as it may think fit and as
a part of its general funds, and the receipt of such officer is to be a
sufficient discharge to the persons paying over the same.

“‘ Power to the Royal Society to enlarge such period of twelve months
for a further pericd of not exceeding (say) two years, in order to give
time for obtaining a site and constructing a new Observatory, with
power to apply the current income, and any accumulations thereof, in
aid of those purposes.

‘‘Also, give power to the Royal Society to direct some other charitable
disposition of the Trust Fund, in case, at the time of the failure of
the Trust as to the Observatory, the London Middle-Class School
shall have ceased to exist as a corporation.’

The Deed of Trust was duly prepared and submitted, and was sealed
with the corporate seal of the Society on the 29th of June, 1871.

The Kew Committee of the Royal Society was at once appointed,
and consisted of the then existing Members of. the Meteorological
Committee of the Royal Society.

The Observatory was handed over to the Society by the British
Association at its Edinburgh Meeting.

Mr. Samuel Jeffery, formerly in charge of the Magnetic Observatory
at Hobarton, was then appointed Superintendent, while Mr. R. H. Scott
undertook the duties of Honorary Secretary to the Committee,
which he continued to discharge for six years until 1877, by which
time the future success of the undertaking was fully secured.

Mr. Jeffery held the office of Superintendent until February, 1876,
when he was succeeded by Mr. G. M. Whipple, B.Sc., who, as appears
from the preceding pages, had been connected with the Observatory
for eighteen years.

64 Mr. R. H. Scott.

During the period of the connection of the Observatory with the
British Association the expenses incurred in carrying out the various
experiments and researches as detailed in the foregoing pages were
considerable. These were met by grants from the Government
Grant Fund or the Donation Fund of the Royal Society, or from
private sources,

During the last fourteen -years, however, since the establishment
has been under the management of the Royal Society Committee, the
necessity for greater economy has been recognised, and the operations —
have been carried on without assistance from the Funds above men-
tioned. The administration has, at the same time, been so satisfac-
torily conducted, and the receipts for the verification of instruments
have so largely increased, that the Committee have been enabled,
out of the surplus balances at their disposal annually, to provide
important and costly additions to the instrumental equipment of
the Observatory, such as the complete refitment of the magneto-
eraphs, and the purchase successively of a Galton’s Thermometer
testing apparatus—of a hydraulic press for deep sea thermometers
—of a new cathetometer—and lastly of the entire apparatus for
watch-rating.

The only extraneous source of income for the Observatory, over and
above occasional small grants from the Meteorological Council for
special researches, has been the money so hberally supplied by Mr. de
la Rue for the completion of the measurement of the sun-pictures.

The Committee has, however, to regret the gradual disappearance of
many familiar faces from the band of men who took prominent parts
in the management of the Observatory in former years.

Of Superintendents, the death of Mr. Welsh has already been
noticed, and his predecessor, Mr. Ronalds, after receiving the well-
merited honour of knighthood for his inventions in Telegraphy, died
in 1873 at the age of eighty-five years.

Of the members of the British Association Committee, Col. W. H.
Sykes, almost its first Chairman, died in 1870; Sir C. Wheatstone,
whose name appears.in the very first resolution of the British Associa-
tion relating to Kew, deceased in 1871; Mr. Gassiot, for eighteen
years the chairman of the British Association Kew Committee, and
the munificent patron of the Observatory in recent years, died in
1876; while Sir E. Sabine, who had been from first to last identified
with the magnetic operations at the Observatory, and might almost
be termed the guiding spirit of the undertaking, passed away in 1883,
having almost attained the patriarchal age of ninety-five years.

The following are the most important facts which can be gathered
from the successive Reports of the Royal Society Committee :—
1872. The Photoheliograph was regularly worked, as in former years,

Mistory of the Kew Observatory. 65

up to the end of February, 1872, at which epoch the period expired
which was originally fixed by Mr. de la Rue for the continuance of
the observations at the expense of the Royal Society Government-
Grant Fund. The observations were afterwards carried on up to the
end of March, with the object of fully mcluding ten years. Since
that date eye observations of the sun, after the method of Hofrath
Schwabe, have been made in order that the observations for connect-
ing sun-spots with magnetic phenomena might not drop through until
photographic records had been taken up on a permanent footing.

In order to furnish the final corrections to the reductions of the
sun-pictures, a scale of equal parts, 15 feet in length, designed by Mr.
de la Rue, and made at his expense, was, with the sanction of Her
Majesty’s Office of Works, erected temporarily on the Pagoda at the
Royal Gardens, Kew. This was photographed by the Kew Photo-
heliograph, and so enclree the optical distortion of that instrument to
be determined.

Observations were continued for several months, when the apparatus
was taken down, and the Photohelograph lent for two years to the
Astronomer Royal for use at Greenwich.

1873. A series of experiments were commenced and carried on for
a space of nearly two years at the expense of the Meteorological Com-
mittee, at the Pagoda in the Royal Gardens, to test the influence of
height above the ground on the vertical distribution of temperature.
The thermometers were placed at three different levels, viz., 22 feet
6 inches, 69 feet, and 123 feet 10 inches above the ground.

In the month of May a request was received from Col. J.T. Walker,
F.R.S. , Superintendent of the Great Trigonometrical Survey of India,
for provision to be made at the Observatory for vibrating pendulums.

In the year 1865 two pendulums lent by the Royal Society for use
in India had been vibrated at Kew by the late Capt. Basevi, as explained
above ; and it was necessary that these pendulums should be vibrated
again on their return, and that at the same time two pendulums
obtained from the Imperial Academy of Sciences at St. Petersburg
should also be vibrated.

The Committee at once complied with the request; and at the
expense of the Indian Government preparation was made for the
experiments in the south hall on the basement story, by removing for
a time the apparatus for testing sextants, and building up from the
foundation-arches two solid isolated supports for the Russian clock
and pendulum.

Capt. Heaviside, R.E., the officer charged with the duty of making
the pendulum experiments, arrived in England in July, and, finding
all the arrangements satisfactory, at once commenced his operations.

Endeavours were made, in connection with the arrangements just
mentioned, to obtain an electrical time communication between Kew

VOL. XXXIX. ¥

66 Mr. R. H. Scott.

and the Royal Observatory at Greenwich; but the proposal failed of
success.

The experiments were continued until the end of May, 1874, when
the apparatus employed, with the exception of the Russian pendulums
and their accessories, was, at the request of the Secretary of the Royal
Society, received at Kew for storage.

1874. The Magnetograph instruments were dismounted in January,
1874, for the purpose of thorough examination and readjustment. The
necessity for this measure is obvious, when it is remembered that the
instruments had been in unintermitted action for the period of fifteen
years.

The scale-values were accordingly redetermined, and the instruments
handed over to Mr. Adie for examination and repair. They were
returned and remounted in May, but were not at that time set in
continuous action, inasmuch as it was intended that the automatic
records should be suspended for the entire year, so as to commence
a new series of observations with the year 1875.

In this year an improved automatic Hlectrograph, invented by Sir
W. Thomson, was erected and set in operation.

In the year 1873 a grant had been obtained from the Government-
Grant Committee for the purpose of carrying on a series of experiments
on the constants of Robinson’s Anemometers; and a piece of ground
in the Park was rented. Several anemometers, of various construc-
tions, were erected therein.

The experience of a few months was sufficient to show that the ex-
posure in the Park was not nearly sufficiently open to afford facilities
for testing the instruments at any but very low velocities, and not
satisfactorily even in such cases. Application was therefore made to
the Secretary of the Crystal Palace Company for permission to employ
a rotary machine driven by steam-power, so as to be able to vary the
velocities at pleasure.

Consent having been most freely given, the experiments were com-
menced, and the instruments tested at various velocities up to about
thirty miles an hour, the highest attainable by the apparatus.

A paper on the results of these experiments was laid before the
Royal Society by Prof. Stokes in 1881 (Proceedings Royal Society,
Mol XXX IT, p. 170).

1875. The year was marked by the recommencement of regular
work with the Magnetographs. The instruments were set in action on
the lst of January, 1875, and therewith the second series of continuous
photographic records of magnetic phenomena was inaugurated.

The principal constants employed in the computations for the Tables
used in the reduction of the monthly absolute observations which had
been determined by Mr. Welsh were also re-examined. A memorandum
containing the results of the observations in question for the twelve

History of the Kew Observatory. 67

months ending September 30th, 1875, was prepared and appended to
the Report for the year, and has formed a feature of every subsequent
annual report.

The Registering Sunshine Recorder invented by the late Mr. J. F.
Campbell, of Islay, F.G.S., which had been in operation for about
twenty years at the Office of the Local Government Board, 8,
Richmond Terrace, Whitehall, was transferred to Kew, and set in
action at the Observatory. The instrument consists of a glass sphere
and wooden bowl, and the effect is measured by the amount of wood
charred by the sun’s action in the course of six months. Hxperiments
were set in progress at the Observatory to obtain a satisfactory daily
record of the duration of the sun’s heating action by a similar method.

1876. In the previous year Mr. C. S. Peirce, of the United States
Coast Survey, had made through the Admiralty an application to the
Royal Society to swing his pendulums at the Observatory. Permission
was at once granted, and Mr. Peirce arrived at Kew in June, 1876, and
as soon as some necessary fittings had been put up in the Pendulum
Room he erected his apparatus, and made a complete series of vibrations.

In 1876, at the request of the Editor of the Times, and at the
expense of that journal, the Staff commenced the preparation of a
weekly diagram showing the traces of the self-recording meteorological
instruments on a reduced scale, together with an epitome of the general
features of the weather. This has appeared without intermission from
that date.

The examination and checking of the work of the self-recording
Observatories of the Meteorological Committee was discontinued in
November. This change of arrangements involved a considerable
reduction in the amount allowed by the Meteorological Office to Kew,
as its central Observatory.

1877. Sir Edward Sabine having brought the discussion of the
Magnetical Observations carried on under his superintendence in all
parts of the globe for a period of nearly forty years, to a close in
a final ‘‘ Contribution,” presented to the Royal Society (No. XV, Phil.
Trans., Vol. 167), represented to the War Office that he was able to
dispense with the further services of the two Sergeants of the Royal
Artillery who had acted as his clerks, and had been in constant attend-
ance at Kew since November, 1871. These men were in consequence
withdrawn on the 31st of March.

The documents deposited in Sir H. Sabine’s late office were pre-
sented by the War Office to the Royal Society, and, in conformity
with instructions received from the Council, are retained in the custody
of the Observatory. A detailed list of these documents and papers has
been prepared, and a selection made of all those relating to marine
observations, which, at the request of the Hydrographer, were trans-
ferred to the Hydrographic Department of the Admiralty.

E 2

1) oe

68 Mr. Royal Seats:

A. system was organized for etching a ‘‘ Hall-mark,” as in the
annexed figure, upon all Thermometers which have been Ed
veritied.

The Astronomer Royal having courteously offered the Committee
every facility for asuggested comparison between the Greenwich and
Kew Standard Barometers during April and May, a number of care-
fully selected Portable Standard Barometers were conveyed to and fro
between Greenwich and Kew on three separate occasions, and a large
number of comparative readings were obtained by the Soe
and Messrs. Baker and Foster.

A complete detailed account of the experiment was drawn up,
and laid before the Royal Society, February 7th, 1878. (Proceedings,
Vol. XXVII, p. 76.)

A Hydraulic Press especially constructed for the purpose of sub-
jecting Deep Sea Thermometers to pressures similar to those they
experience when sunk to great depths, was erected in the workshop.
It is capable of exerting a strain equal to 4 tons on the square inch.

1879. Experiments were commenced at the Observatory, with the
view of determining the relative merits of different patterns of
thermometer screens, and continued for upwards of two years. For
this purpose there were erected on the lawn a Stevenson’s screen,
of the ordinary pattern, and a large wooden cage, enclosing a Wild’s
screen, of the pattern employed in Russia. Hach of these screens
contained a dry and a wet bulb thermometer, and a maximum and
minimum, all of which were read daily, at 9 a.m. and 9 p.m., their
indications being compared with those of the thermograph at the
same hours.

A discussion of the twenty-eight months’ observations was sub-
sequently made by Mr. Whipple, and the results published by the
Meteorological Council.

1880. A Sub-Committee, which had been appointed in 1878 to
consider the best means of utilising the records of the magnetographs,
reported that 1t was inadvisable, in their opinion, to proceed with the
reoular tabulation of the curves, and suggested that attention should
rather be directed to their comparison with synchronous curves, taken
at other Magnetic Observatories in different parts of the globe, in
order to ascertain whether similar disturbances occur at these several
stations, and at what time intervals; with a view to the development
of the theory of magnetic disturbance.

Tn order to carry out this scheme, a circular, inviting co-operation
on the part of observers provided with magnetographs of the Kew
pattern, was issued to the Directors of the following Observatories :—
Batavia, Bombay, Brussels, Coimbra, Colaba, Lisbon, Mauritius,
Melbourne, Potsdam, St. Petersburg (Pawlowsk), San Fernando,
Stonyhurst, Utrecht, Vienna, and Zi-Ka-Wei. Replies favourable to

History of the Kew Observatory. 69

the project were received from all those whose instruments were work-
ing under satisfactory circumstances.

An examination of the records for the year 1879 indicated the
month of March as that most suitable for the purpose of the com-
parison. Accordingly, a further request for copies of the Declination
curves for that month was issued, and, in response, they were received
from Coimbra, Colaba, Lisbon, Mauritius, Melbourne, St. Petersburg,
Stonyhurst, Toronto, Utrecht, Vienna, and Zi-Ka-Wei.

The comparison of these magnetic curves was undertaken by Pro-
fessor W. Grylls Adams, who communicated to the Swansea Meeting
of the British Association a preliminary account of the principal facts
which came to light. This was followed by a second paper printed in
the Report of the York Meeting, 1881.

At the request of the Council of the Royal Astronomical Society, the
valuable collection of MSS. containing the memorable series of sun-spot
observations made by Hofrath Schwabe, of Dessau, during the years
1825 to 1867, which had been deposited in the Library of the Obser-
vatory, the first volumes since 1865, was transferred to the Society’s
Library at Burlington House, London. In order, however, to render
the collection of sun-spot observations as complete as possible, and to
prevent the total loss of the observations in case of fire, the Committee
voted the sum of 901. to defray the cost of making a complete copy of
the solar drawings.

This was accordingly done, and accurate tracings made of every one
of Schwabe’s drawings. These were pasted into blank books, and any
important notes were transcribed at the same time.

The Observatory, therefore, now possesses a complete record of the
condition of the sun’s surface, extending from November, 1825, to the
present date.

In 1881, an application was received from Major Herschel, R.E.,
F.R.S., by authority of the India Office, for permission to make certain
experiments with the invariable pendulums deposited at Kew, and for
the loan of the instruments, with their accompanying appliances, with
facilities for prosecuting the experiments at the Observatory.

These requests were granted, and in the autumn of the year operations
were carried on, both in the Pendulum Room and in the Experimental
House at Kew.

On completing his work Major Herschel conveyed the instruments
he employed, first to the Royal Observatory, Greenwich, and sub-
sequently to a house near Portland Place, London. Series of observa-
tions were made in both those places, with the object of reducing to a
common standard the determinations of gravity made by Kater, Airy,
Sabine, and others.

On the conclusion of these latter experiments, Major Herschel con-
veyed the pendulums, clock, &c., to America, where, after making a

70 Mr. R. H. Scott.

series of observations at Washington, he handed them over to th.
officers of the United States Coast Department. Subsequently Professor
C.S. Peirce, of the United States Coast Survey, who had made a series
of pendulum observations at Kew and elsewhere in 1876, visited the
Observatory in July, 1883, and made a subsidiary series of experiments
with a view of determining the flexure of his stand when on the Kew
piers.

1882. In April of this year the Chairman announced the comple-
tion of the long series of reductions of the Kew Photoheliograph
measurements, extending over the period February 7th, 1862, to April
9th, 1872. He stated that the MSS. volumes containing the results
had been deposited for reference with the Royal Society, and that the
whole of the sun-pictures had been re-measured at the Observatory,
and reduced by Mr. A. Marth, F.R.A.S., so as to give the heliocentric
longitudes and latitudes of the spots, as well as their areas.

The entire expense attendant on these reductions, which has
amounted to the considerable sum of 1,452/. 6s. 7d., was defrayed by
Mr. de la Rue. This amount was in addition to the sums that gentle-
man had previously disbursed in contributing to the maintenance of
the Photoheliograph, and the prosecution of solar research. The total
amount of his payments towards this branch of the Observatory work
has reached the large sum of 2,0711. 15s. 4d.

In the same year the Committee received very gratifying testimony as
to the accuracy of the Standard Thermometers constructed at the Obser-
vatory. Ina paper contributed to the ‘‘ American Journal of Science,”
Dr. Leonard Waldo, of the Winchester Observatory, Yale College,
U.S.A., remarks that after a critical examination of three Kew Standard
Thermometers, in which every degree was separately measured, entail-
ing no less than 2,500 micrometer readings, he came to the conclusion
that their errors are practically insensible, and too small to be detected
with certainty.

Professors Thorpe and Riicker also tested very minutely three similar
instruments made for them at Kew. In a paper read at York before
the British Association, Professor Riicker stated, ‘‘In no case would
the calibration error in the determination of a difference of tempera-
ture have amounted to 0:02° C. It may therefore be concluded that
Welsh’s method, as applied at Kew to selected tubes, and with a
measuring instrument of great accuracy, is capable of giving first-rate
results. The errors which remain when it has been applied are so
small that they may be neglected in all cases but those where the
thermometers are to be used under the most favourable conditions,
7.e., with the stem of the same temperature as the bulb, &c. This
satisfactory conclusion is confirmed by the fact that Professor Rowland
has recently stated that the calibration of the Kew thermometer used
by him in his research on the mechanical equivalent of heat was
practically perfect.” (British Association Report, 1881, p. 541.)

History of the Kew Observatory. (5.

1883. In this year the Committee decided to make a trial of a
system of watch-rating for the public, and granted 100/. for the
preliminary expenses. In accordance with a scheme prepared by the
Superintendent, they fitted up in the Observatory a first-class burglar-
and fire-proof safe for the safe custody of the watches. In the next
year’s Report we learn that the arrangements for rating watches
mentioned in last year’s Report had been completed and brought into
operation successfully, at a cost of 1931.

1884. A second safe having been purchased by the Committee, an
apparatus was fitted to it which enables the enclosed watches to be
maintained continuously at either high or low temperatures, whichever
may be required, and furthermore without being subjected to injury
by fumes of gas in the former case.

The following was the constitution of the Kew Committee at the
close of the year 1884 :—

Mr. W. de la Rue, Chairman.
Captain W. de W. Abney, R.H.
Professor W. G. Adams.

Captain Sir F. Evans, K.C.B.
Professor G. C. Foster.

Mr. F. Galton.

Admiral Sir G. H. Richards, C.B.
The Earl of Rosse.

Mr. R. H. Scott.

Lieut.-General W. J. Smythe.
Lieut.-General R. Strachey, C.S.I.
Mr. H. Walker.

The staff employed at the same date was as follows :—

G. M. Whipple, B.Sc., Superintendent.

T. W. Baker, Chief Assistant and Magnetic Observer.
J. Foster.

H. McLaughlin.

H. G. Constable.

T. Gunter.

With five juniors.

12

The

Mr. R. H. Scott.

following may be considered asa summarised statement of the

scientific work done at the Kew Observatory since its foundation as a
Physical Observatory :—

1, Improvements in the construction and manufacture of imstru-

© bo

The
at the
A

B
C
D
H
FE

ments for meteorological observations, the production of new
ones, and the modification of older forms.

. The same with regard to magnetic and electrical instruments.
. The distribution of such instruments over the globe.
. The ensuring of accuracy of observations by means of the

verification and distribution of standard instruments and the
instruction of observers.

. The continuous recording of magnetical and meteorological

phenomena.

. The practical adaptation of photography to scientific purposes,

and especially to the continuous registration of phenomena
occurring on the sun’s surface.

. The improvements of nautical, geographical, fiscal, physical,

and medical instruments by verification, and of horological
by watch-rating.

. Assistance in the prosecution of research in the following

sclences :—
1. Astronomy.—De la Rue’s, Stewart’s, and Loewy’s solar
researches ; Gassiot’s spectroscopy.
2. Geodesy.—Pendulum observations—Basevi, Heaviside,
Peirce, Herschel.
5. Magnetism.—Sabine and others too numerous to mention.
4. Meteorolugy.—Ditto, ditto.
Physics:—Roscoe’s Actinometry ; Stewart’s ditto.
Sanitary Institution—Ventilation.
Greaves, Evaporation.
Stewart, Dilatation of Air and Theory of Hx-
change Hxperimenis. :
Stokes, Friction of Gases.
Loewy, Pressure on Thermometers.
Anemometrical Coefficients, &c.

6. Magnetie Surveys—Scotch (Welsh); Arctic and Ant-
arctic—Perry’s, Thorpe’s, &c.; Fort Rae and other
Hxpeditions.

following Appendices supply particulars as to the operations
Observatory in successive years :—

. Physical Constants for Kew Observatory.

. List of Observatories supplied with Magnetographs.

Or

, Be Pa Meteorographs.

. List of Verifications.
. Catalogue of Papers relating to Kew Observatory.

. Annual Statement of Money received by Kew Observatory.

13

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B. List or OBSERVATORIES SUPPLIED WITH Kew PATTERN MAGNETOGRAPHS.

Toronto ,
Ma a 7 ‘ Ronalds’ pattern.

—

. Batavia.

2. Coimbra.

3. Lisbon.

4. United States (?).

5. St. Petersburg (Pawlowsk).
6. Florence.

7. Stonyhurst.

8. Utrecht.

9. Melbourne.

10. Bombay (Colaba).

J1. Mauritius.

12. Vienna (Hohe-Warte.)

13. Zi-Ka- Wei.

14. San Fernando.

15. Potsdam.

16. Brussels.

17. Nice.

18. United States (Naval Department.)

C. List oF OBSERVATORIES SUPPLIED WITH SELF-RECORDING METEORO-
LOGICAL INSTRUMENTS ON THE KEw MopsEt.

Barograph. Thermograph. Anemograph. Rain gauge.

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FTistory of the Kew Observatory.

(6)

D. List of VERIFICATIONS COMPLETED AT THE OBSERVATORY.

Thermometers.
1852-53 ...... —
1853-54 ...... 181
1854-55 00... 2520
1855-56 ...... 530
RS56=57> .....: 1524
| Rctoy ons 268
1858-59 ...... 911
1859-60 ...... 222
1860-61 ...... 660
1861-62 ...... 282
FS62-03 »...... 296
1863-64 ...... 389
1864-65 ...... 420
1360-66 ...... 395
WS06-67. 2..:.. 608
1867-68 ...... 1138
PS68=69 ©... 1153

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Barometers. Hydrometers.
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16

NUMBER OF INSTRUMENTS VERIFIED, &c., SINCE 1869.

Surveying
Instruments, &c.

Mr. R. H. Scott.

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Self-Registering Apparatus.

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Lowa] et — Laon = eo =! La et ei et ci et ei a

Flistory of the Kew Observatory. 77

K. olen OF PAPERS RELATING TO KEW
OBSERVATORY.

Adams, W. Grylls—

Comparison of Curves of the Declination Magnetographs at Kew,
Stonyhurst, Coimbra, Lisbon, Vienna, and St. Petersburg.
Brit. Assoc. Rep., Li, 1880, pp. 201-209.

On Magnetic Disturbances and EHarth-Currents. Brit. Assoc.
Rep., LI, 1881, pp. 463-474.

Beckley, &.—

Description of a Self-recording Anemometer. Brit. Assoc. Rep.,

XXVIII, 1858, pp. 306, 307.
Birt, W. &.—

Report on the Discussion of the Electrical Observations at Kew.

Brit. Assoc. Rep., 1849, pp. 1138-199.
De la Rue, Warren—

On the Total Solar Eclipse of July 18th, 1860, observed at
Rivabellosa, near Miranda de Hbro, in Spain. Phil. Trans.,
1862, pp. 333-416.

Researches on Solar Physics. First Series. On the Nature of Sun-
spots. Amer. Journ. Science, XLIII, 1867, pp. 179-192.

Researches on Solar Physics. Second Series. Area Measurement
‘of the Sun-spots observed by Carrington during the seven
years from 1854-1860 inclusive, and deduction therefrom.
Amer. Journ. Science, XLII, 1867, pp. 322-330.

Results of the Observations on Sun-spots made in Kew and in
Dessau during the years 1867-68. Astron. Soc. Month. Not.,
XXVIII, 1868, pp. 44, 45; X XIX, 1869, p. 95.

Sun-spots and general Aspect of the Sun on the day of the
Total Helipse, 18th August, 1868. Astron. Soc. Month. Not.,
XXIX, 1869, pp. 3, 4.

Summary of Sun-spot Observations made by the Kew Photo-
heliograph during the years 1869-72. Astron. Soc. Month.
WNjot XOXOX. 18705 py 605) DOOKIE 13871, pp. 79; 805 XX X11
1872, pp. 225, 226; XX XITI, 1873, pp..173, 174.

De la Rue, Stewart, and Loewy—

Researches on Solar Physics. First Series. On the Nature of
Solar Spots. Roy. Soc. Proc., XIV, 1865, pp. 37-39; Phil.
May., XXIX, 1865, pp. 237-239.

Researches on Solar Physics. Second Series. On the Behaviour
of Sun-spots with regard to Increase and Diminution. Roy.
Soc. Proc., XIV, 1865, pp. 59-638; Phil. Mag., X XIX, 1860,
pp. 890-394.

78 Joke Re El useotts

Note regarding the Decrease of Actinic Effect near the Circum-
ference of the Sun as shown by the Kew Pictures. Astron.
Suc. Month. Not., XXVI, 1866, pp. 74-76; Phil. Mazg.,
XX XI, 1866, pp. 243, 244,

Note on the Distribution of Solar Spotted ness: in Heliographic
Latitude. Phil. Mag., XX XIII, 1867, pp. 79, 80; Astron.
Soc. Month. Not., XX VII, 1867, pp. 12-14.

Account of some recent Observations on Sun-spots made at the
Kew Observatory. Roy. Soc. Proc., XVI, 1868, p. 447.
Researches on Solar Physics. Heliographical Positions and
Areas of Sun-spots observed with the Kew Photoheliograph
during the years 1862 and 1863. (1868.) Phil. Trans., CLIX,

1869, pp. 1-110.

Researches on Solar Physics. No. 2. The Positionsand Areas of
the Spots observed at Kew during the years 1864, 1865,
1866; also the Spotted Area of the Sun’s visible Disk from
the commencement of 1832 up to May, 1868. Phil. Trans.,
CLX, 1870, pp. 389-496; Phil. Mag., XL, 1870, pp. 53, 54;
toy. Soc. Proc., XVIII, 1870, pp. 2638, 264.

Further Investigations on Planetary Influence upon Solar Activity.
Roy. Soc. Proc., XX, 1872, pp. 210-218.

On some recent Researches in Solar Physics, and a law regulating
the time of duration of the Sun-spot period. (1871.) Roy.
Soc. Proc., XX, 1872, pp. 82-87, 290; Phil. Mag., XLII,
1872, pp. 385-390.

On a Tendency observed in Sun-spots to change alternately from
one Solar Hemisphere to the other. oy. Soc. Proc., XXI,
1873, pp. 399-402.

Everett, Joseph D.—

Results of Observations of Atmospheric Electricity at Kew
Observatory and at King’s College, Windsor, Nova Scotia.
Phil. Trans., CUVIII, 1868, pp. 347-361; Roy. Soc. Proc.,
XVI, 1868, pp. 195, 196; Phil. Mag., XXXIV, 1867, pp. 543,
O44,

Gassiot, J. P.—

On the Adaptation of Bisulphide-of-Carbon Prisms, and the use of
Telescopes of long focal distance, in the Hxamination of the
Sun’s Spectrum. Brit. Assoc. Rep., XXXIV, 1864 (Part 2),
pails

On Spectrum Analysis, with a description of a large Spectroscope
having nine Prisms, and Achromatic Telescopes of two feet
focal power. (1863.) Phil. Mag., XX VII, 1864, pp. 143, 144.

Description of a Train of Eleven Sulphide-of-Carbon Prisms
arranged for Spectrum Analysis. oy. Soc. Proc., XIII,
1864, pp. 183-185 ; Phil. Mag., XXVIII, 1864, pp. 69-71.

History of the Kew Observatory. 79

Description of a Rigid Spectroscope, constructed to ascertain
whether the position of the known and well-defined lines of
a spectrum is constant while the co-efficient of terrestrial
gravity under which the observations are taken is made to
vary. oy. Soc. Proc., XIV, 1865, pp. 320-326.

On the Observations made with a Rigid Spectroscope by Captain
Mayne and Mr. Connor, Second Master of H.M.S. “ Nassau,”
ona voyage to the Straits of Magellan. (1867.) Roy. Soc.
Proc., XVI, 1868, pp. 6-19. |

Kew Committee (The)—

Results of the Monthly Observations of Magnetic Dip, Horizontal
Force, and Declination made at the Kew Observatory from
April 1869 to March 1875 inclusive. Roy. Soc. Proc., XXIV,
1876, pp. 232-240.

Rigaud, Major-General Gibbes —
Dr. Demainbray, and the King’s Observatory at Kew. The
Observatory, 1882, Vol. V, pp. 279-285.
Ronalds, Sir F'.—

Report concerning the Observatory of the British Association at
Kew from lst August 1843 to 31st July 1844. Brit. Assoc.
Rep., 1844, pp. 120- 142.

On the Meteorological Observations at Kew, with an Account of
the Photographic Self-registering Apparatus. Brit. Assoc.
Rep., 1846 (Part 2), pp. 10, 11.

Experiment made at the Kew Observatory on a new Kite-
Apparatus for Meteorological Observations. Phil. Mag.,
XXXI, 1847, pp. 191, 192.

On Photographic Self-registering Meteorological and Magnetic
Instruments. Phil. Trans., 1847, pp. 111-117.

Reports concerning the Observatory of the British Association at
Kew. Brit. Assoc. Rep., 1849, pp. 80-87 ; 1850, pp. 176-186;
1851, pp. 335-370.

Sabine, Sir L.—

Report on the Kew Magnetographs. Brit. Assoc. Rep., 1851, pp.
320-328.

On the Laws of the Phenomena of the larger Disturbances of the
Magnetic Declination in the Kew Observatory, with notices
of the progress of our knowledge regarding the magnetic
storms. toy. Soc. Proc., X, 1859-60, pp. 624-631.

On the Secular Change in the Magnetic Dip in London between
the years 1821 and 1860. Roy. Soc. Proc., XI, 1860-62, pp.
144-163.

Notices of some Conclusions derived from the Photographic
Records of the Kew Declinometer, in the years 1858, 1859,
1860, aid 1862. Roy. Soc. Proc., XI, 1860-62, pp. 585-590.

80 Mr. R. H. Scott.

Results of the Magnetic Observations at the Kew Observatory,
from 1857-8 to 1862 inclusive. Phil. Trans., 1863, pp.
273-284.

A Comparison of the most notable Disturbances of the Magnetic
Declination in 1858 and 1859 at Kew and at Nertschinsk,
preceded by a brief retrospective view of the progress of
the investigation into the laws and causes of the magnetic
disturbances. Phil. Trans., CLIV, 1864, pp. 227-246, Roy.
Soc. Proc., XIII, 1864, pp. 247-252.

Results of the Magnetic Observations at the Kew Observatory.
No. 3. Lunar-Diurnal Variation of the three Magnetic
Hlements. Phil. Trans., CUVI, 1866, pp. 441-452, Roy. Soc.
Proc., XV, 1867, pp. 249, 250.

Results of the first year’s performance of the Photographically
Self-recording Meteorological Instruments at the Central
Observatory of the British System of Meteorological Obser-
vations (1869). Roy. Soc. Proc., XVIII, 1870, pp. 3-12.

Records of the Magnetic Phenomena at the Kew Observatory.
No. 4. Analysis of the, Principal Disturbances shown by the
Horizontal and Vertical Force Magnetometers of the Kew
Observatory, from 1859 to 1864. Phil. Trans., CLXI, 1871,
pp. 807-320.

Scott, Robert H.—

Results of Observations made at the Pagoda, Kew Gardens, to
determine the Influence of Height on Temperature, Vapour
Tension, and Humidity. Qwuarterly Weather Report of the
Meteorological Office, 1876. App., pp. [20 ]-[37].

Stewart, B.—

On some Results of the Magnetic Survey of Scotland in the years
1857 and 1858, undertaken by the late John Welsh. Brit.
Assoc. Rep., 1859, pp. 167-190.

An Account of the Construction of the Self-Recording Magneto-
graphs at present in operation at the Kew Observatory of the
British Association. Brit. Assoc. Rep., 1859, pp. 200-228.

On the great Magnetic Disturbance of 28th August to 7th
September, 1859, as recorded by Photography at the Kew
Observatory. Roy. Soc. Proc., XI, 1860-62, pp. 407-410;
Phil. Trans., 1861, pp. 423-480.

On the Magnetic Disturbance which took place on the 14th De-
cember, 1862. Roy. Soc. Proc., XII, 1862-63, pp. 663-668 ;
Phil. Mag., XX VII, 1864, pp. 471-475.

An Account of Experiments on the Change of the Elastic Ferce of
a Constant Volume of Atmospheric Air, between 32° Fahr.
and 212° Fahr., and also on the Temperature of the Melting-
point of Mercury. Phil. Trans., 1868, pp. 425-435.

LMistory of the Kew Observatory. 81

On the Forces concerned in producing Magnetic Disturbances.
Roy. Inst. Proc., IV, 1863, pp. 55-61.

On the Sudden Squalls of 30th October and 21st November,
1863. oy. Soc. Proc., XIII, 18638, pp. 51, 52.

On the Errors of Aneroids at various pressures. Brit. Assoc.
Rep., XX XVII, 1867 (Sect.), pp. 26, 27.

On a Self-recording Rain-Gauge. Brit. Assoc. Rep., XXXIX,
1869 (Sect.), p. 52.

Preliminary Report of the Solar Physics Committee, on a » Com-
parison for two years between the Diurnal Ranges of
Maenetic Declination as recorded at the Kew Observatory,
and the Diurnal Ranges of Atmospheric Temperature as
recorded at the Observatories of Stonyhurst, Kew, and
Falmouth. Roy. Soc. Proc., XX XIII, 1882, pp. 410-420.

On the Velocity of Propagation between Oxford and Kew of
Atmospheric Disturbances. (1864.) Brit. Met. Soc. Proc.,
M1865, prol:

Note on the Secular Change of Magnetic Dip, as recorded at the
Kew Observatory. (1866.) Roy. Soc. Proc., XV, 1867, pp.
8,9. Phil. Mag., XXXI, 1866, pp. 235-237.

A Ghknkeiaori between some of the Simultaneous Records of the
Barographs at Oxford and at Kew. Roy. Soc. Proc., XV,
1867, pp. 413, 414.

Description of an Apparatus for the Verification of Sextants,
designed and constructed by T. Cooke, and recently erected
at the Kew Observatory. (1867.) Roy. Soc. Proc., XVI,
1868, pp. 2-6.

An Account of Certain Experiments on Aneroid Barometers
made at Kew Observatory at the expense of the Meteoro-
logical Committee. oy. Soc. Proc., XVI, 1868, pp. 472-
480; Smithsonian Reports, 1868, pp. 350-353; Phil. May.,
XXXVIT, 1869, pp. 65-74.

A Preliminary Investigation into the Laws regulating the Peaks
and Hollows exhibited in the Kew Magnetic Curves for the
first two years of their production. Roy. Soc. Proc., XVII,
1869, pp. 462-468.

Results of the Monthly Observations of Dip and Horizontal Force
made at the Kew Observatory from April 1863 to March
1869 inclusive. oy. Soc. Proc., XVIII, 1870, pp. 231-242.

On the Variations of the Daily Range of Atmospheric Tempera-
ture as recorded at the Kew Observatory. Roy. Soc. Proc.,
XXV, 1876, pp. 156-158 ; 1877, pp. 577-592.

On the Variations of the Daily Range of the Magnetic Declina-
tion as recorded at the Kew Ghent. er Soc. Prec.,
XXVI, 1877, pp. 102-121.

VOL. XXXIX. G

82 Mrs Kis Scots:

Note on the Inequalities of the Diurnal Range of the Declination
Magnet as recorded at the Kew Observatory. Roy. Soc.
Proc., XXVIII, 1879, pp. 241, 242.

Stewart, B., and Brito-Capelio, J—

Results of a Comparison of Certain Traces produced simultane-
ously by the Self-recording Magnetographs at Kew and
at Lisbon, especially of those which record the magnetic
disturbance of 15th July, 1863. Roy. Soc. Proc., XIII,
1864, pp. 111-120.

Description of the Magnetic Storm of the beginning of August
1865, as recorded by the Self-recording Magnetographs at
the Kew and Lisbon Observatories. Brit. Assoc. Rep.,
XXXV, 1865 (Sect.), pp. 20, 21.

Stewart, B., and Carpenter, W. L.—

Report to the Solar Physics Committee on a Comparison between
apparent Inequalities of Short Period in Sun-spot Areas and
in Diurnal Temperature-ranges at Toronto and Kew. Roy.
Soc. Proc. XX XVII, 1884, pp.. 290-816.

Stewart, B., and Dodgson, W.—

Note on a Comparison of the Diurnal Ranges of Magnetic Decli-
nation at Toronto and Kew. Roy. Soc. Proc., XXXII, 1881,
pp. 406, 407.

Stewart, B., and Loewy, B.—

An Account of the Base Observations madeat the Kew Observa-
tory with the Pendulums to be used in the Indian Trigono-
metrical Survey. Roy. Soc. Proc., XIV, 1865, pp. 425-439.

An Account of Experiments made at the Kew Observatory for
determining the true Vacuum- and Temperature-Corrections
to Pendulum Observations. Roy. Soc. Proc., XVII, 1869, pp.
488-499.

Stewart, B., and Morisabro, Hiraoka—

A Comparison of the Variations of the Diurnal Range of Magnetic
Declination, as recorded at the Observatories of Kew and
Trevandrum. oy. Soc.. Proc., XXVIII, 1879, pp. 288-240.

Stewart, B., and Roscoe, H. H.—

On the Heat of Sunshine at London during the twenty-four
years 1855 to 1874, as registered by Campbell’s method. Roy.
Soc. Proc., X XIII, 1875, pp. 578-582.

On the Heat of the Sunshine at the Kew Observatory, as registered
by Campbell’s method. Brit. Assoc. Rep., LIII, 1883, pp.
414-418.

Stewart, B., and Sidgreaves, W.—

Results of a Preliminary Comparison of certain Curves of the Kew
and Stonyhurst Declination Magnetographs. Roy. Soc. Proc.,
XVII, 1869, pp. 236-288.

Ffistory of the Kew Observatory. 89

Stokes, G. G.—

Discussion of the Results of some Experiments with Whirled

Anemometers. toy. Soc. Proc., XXXII, 1881, pp. 170-188.
Welsh, J.—

On the Graduation of the Thermometers for the Arctic Searching
Expedition. Roy. Soc. Proc., VI, 1850-54, pp. 183-188.
Description of a Sliding-Rule for converting the observed Readings
of the Horizontal and Vertical Force Magnetometers into
Variations of Magnetic Dip and Total Force. Brit. Assoc.

Rep., 1851 (Part 2), pp. 20, 21.

Description of a Sliding-Rule for Hygrometrical Calculations
Brit. Assoc. Rep., 1851 (Part 2), pp. 42, 43.

Report of the General Process adopted in Graduating and Com-
paring the Standard Meteorological Instruments for the
Kew Observatory. Rvy. Soc. Proc., VI, 1852, pp. 178, 179.

On the Graduation of Standard Mheraiomersrs at the Kew
Observatory. Brit. Assoc. Rep., 1853 (Part 2), pp. 34-36.

An Account of Meteorological Observations in four Balloon Ascents
made under the direction of the Kew Observatory Committee
of the British Association. Phil. Trans., 1853, pp. 311-3846 ;
Annales de Chimie, XUI, 1854, pp. 503-507.

Instructions for the Graduation of Boiling-point Thermometers,
intended for the Measurement of Heights. Brit. Assoc. Rep.
1856 (Part 2), p. 49.

Account of the Construction of a Standard Barometer, and
Description of the Apparatus and Processes employed in the
Verification of Barometers at the Kew Observatory. Phil.
Trans., 1856, pp. 907-514.

Whipple, G. M.—

On the Temperature-Correction and Induction-Coefficients of
Magnets. Proc. Roy. Soc., Vol. XXVI, 1877, pp. 218-222.

On the Determination of the Scale Value of a Thomson’s
Quadrant Hlectrometer used for Registering the Variations
in Atmospheric Hlectricity at the Kew Observatory. Proc.
Roy. Soc., Vol. XX VII, 1878, pp. 356-361.

On the Comparison of the Standard Barometers of the Royal
Observatory, Greenwich, and the Kew Observatory. Proc.
fioy. Soc., Vol. XX VII, 1878, pp. 76-81.

Results of an Inquiry into the Periodicity of Rainfall. Proc.
Roy. Soc., Vol. XXX, 1880, pp. 70-84.

On the Results of Comparisons of Goldschmid’s Aneroids.
Quart. Journ. Met. Soc., Vol. V, 1879, pp. 189-191.

On the Relative Duration of Sunshine at the Royal Observatory,
Greenwich, and at the Kew Observatory during the year
1877. Quart. Journ. Met. Soc., Vol. TV, 1878, pp. 201-207.

G 2

54

Mr. R. H. Scott.

On the Relation existing between the Duration of Sunshine, the
Amount of Solar Radiation, and the Temperature indicated
by the Black-Bulb Thermometer in vacuo. Quart. Journ. Met.
Soc., Vol. V, 1879, pp. 142-146.

On the Relation between the Height of the Barometer, the
Duration of Sunshine, and the Amount of Cloud, as observed
at the Kew Observatory. Quart. Journ. Met. Soc., Vol. V,
1879, pp. 213-217.

On the Rate at which Barometric Changes traverse the British
Isles. Quart. Journ. Met. Soc., Vol. VI, 1880, pp. 136-141.

On the Relative Frequency of Given Heights of the Barometer
Readings at the Kew Observatory during the ten years 1870-
79. Quart. Journ. Met. Soc., Vol. VII, 1881, pp. 52-57.

On the Variations of Relative Humidity and Thermometric
Dryness of the Air with Changes of Barometric Pressure at
the Kew Observatory. Quart. Journ. Met. Soc., Vol. VII, 1881,
pp. 49-52.

Results of Experiments made at the Kew Observatory with
Bogen’s and George’s Barometers. Quart. Journ. Met. Soc.,
Vol. VII, 1881, pp. 185-189.

Observations of Atmospheric Electricity at the Kew Observatory
during 1880. Brit. Assoc. Report, LI, 1881, pp. 443-450.
Composite Portraiture adapted to the Reduction of Meteorological
and other similar Observations. Quart. Journ. Met. Soc.,

Vol. IX, 1883, pp. 189-192.

Description of an Apparatus employed at the Kew Observatory,
Richmond, for the Examination of the Dark Glasses and
Mirrors of Sextants. Proc. Roy. Soc., Vol. XXXV, 1883,
pp. 42-44.

Preliminary Inquiry into the Causes of the Variations in the
Readings of Black-Bulb Thermometers im vacuo. Quart.
Journ. Met. Soc., Vol. X, 1884, pp. 45-52.

Report on Experiments made at the Kew Observatory with
Thermometer Screens of different Patterns during 1879,
1880, and 1881. Quarterly Weather Report of the Meteorologi-
cal Office, 1880, App. II. pp. [13 |-[16].

Whipple, G. M., and Baker, T. W.—

Barometric Gradients in connection with Wind Velocity and
Direction at the Kew Observatory. Quart. Journ. Met. Soc.,
Vol. VIII, 1882, pp. 198-203.

History of the Kew Observatory.

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Micrescopie Characters of Devitrified Glass. 87

“On the Microscopic Characters of some Specimens of Devitri-
fied Glass, with Notes on certain analogous Structures in
Rocks.” By DoueLAs HERMAN and FRANK RUTLEY. Com-
municated by Professor T. G. BoNnnEy, D.Sc, F.RS.
Received May 28, 1885. Read June 18.

(Plates 1—4.})

Devitrification is a process which may either take place naturally
or be brought about by artificial means. Instances of the former are
familiar to us in once glassy rocks which have passed into a felsitic
or micro-crystalline-granular condition. The change which has taken
place in the conversion of obsidian into felstone is so great that it
would not be possible to infer the original nature of the rock, were it
not that certain structural peculiarities, often of a very delicate cha-
racter, are retained. It is, indeed, a most remarkable feature in such
rocks that a physical change so complete should fail to obliterate the
perlitic structure and the fine streaky markings or fluxion-bands
which are common in the vitreous lavas of every age. The microscopic
recognition of such structures has of late years added considerably to
our knowledge of the rhyolitic rocks and tuffs of Archean and
Paleozoic times, many of which were undoubtedly hyaline rhyolites.
Through devitrification their original character has been obscured,
and in many instances can only be revealed by the use of the
microscope. Although much has been written upon this subject,
including Vogelsang’s admirable work,* we are still in compara-
tive ignorance of the conditions under which such devitrification
has taken place. The experiments .of Daubrée,t made upon glass
tubes at a high temperature and pressure, in presence of water,
resulted in the development of a schistose or foliated structure,
corresponding with the cylindrical form of the tubes acted upon:
the development in some cases of reticulating cracks, due to contrac-
tion, the transformation of the glass into a friable substance with a
structure both fibrous and concentric, and also into a hard material
with similar structure. Professor Daubrée has likewise in these
experiments produced radiating crystalline or spherulitic bodies,
microliths, and aetual crystals of pyroxene and quartz. The glass
upon which he operated contained, in its unaltered condition—

* “Die Krystalliten.” Bonn, 1875,
+ “ Etudes Sj)nthetiques de Géolcgie Expérimentale,”’ p. 155. Paris, 1879.

88 Messrs. D. Herman and F. Rutley.

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The observations recorded in the present paper refer to structures
developed in specimens of glass which, for the most part, were pre-
pared, and all devitrified, at the Glass Works of Messrs. Pilkington
Bros., St. Helens, and it is possible that they may have a special
interest for those who are studying the natural devitrification of
obsidians or other glassy or glass-bearing rocks, since in the cases here
recorded the precise conditions of devitrification are known, while in
the natural process we do not know the precise conditions. We may,
however, assume with considerable safety, that within certain limits
there will be a more or less close analogy between the results of the
natural and artificial devitrification, allowing of course a margin for
certain natural conditions which it would be difficult if not impossible
to reproduce experimentally. Thinking that some definite laws might
be arrived at by devitrifying solids of various forms, we have operated
upon cubes, hexagonal prisms, trigonal prisms, spheres, cylinders,
flat plates, and other distinct forms, and these we shall first describe.
The difficulties attendant upon the microscopic examination of such
materials consist principally in their excessive opacity in some
cases, and in others upon the readiness with which the substances
disintegrate during the process of grinding. The latter difficulty
has In many instances been successfully overcome by Mr. Cuttell,
by whom most of the sections have been carefully and admirably
cut, so that the boundaries of the solids are preserved without
injury.

Specimen No. 115 originally formed part of a 1-inch-thick piece of
plate-glass, which was accidentally coloured green, during fusion, by

Microscopie Characters of Devitrified Glass. 89

a small quantity of ferruginous material. The plate, measuring about
6 feet by 3 feet 8 inches, was devitrified in the following manner. A
layer of sea sand, previously washed, sifted, and dried, was spread to
a depth of 25 inches on the floor of a kiln used for annealing glass-
house pots. On this sand the plate was carefully bedded and covered
with more sand to a depth of 6 inches, the whole being kept together
by a low brick wall. The object of bedding in sand was to prevent
the bending and fusion of the plate when the kiln attained its highest
temperature. The kiln was then lighted, and the heat slowly raised.
In six days it had attained a dull red, and in six days more was at its
full heat, a very bright red, sufficient to soften, but not enough to
melt, the glass through its covering of sand. This temperature was
maintained for twelve days, when the kiln was Jet out, and quickly
cooled by opening the door. The mass of sand, however, retained its
heat for a considerable time after it was possible to enter the kiln,
for, on removing the dwarf retaining wall four days after the door
was opened, the plate broke in consequence of cold air coming in
contact with one of the edges, whilst the other parts were at a com-
paratively high temperature. The glass was thus in the kiln altogether
for twenty-eight days, during six of which it was gradually heated to
dull redness, during six more the temperature was increased to bright
red, maintained at this for twelve days, and cooled during four. It
was found to be thoroughly devitrified, and large pieces were ground
with sand and water to a fine smooth surface on both sides, by which
the thickness was reduced to seven-eighths of aninch. The portion
selected for microscopical examination was broken off a corner of one
of the large pieces. It is opaque, dull, and porcellanous externally
on the ground surfaces, in places which have not been ground the
surface is rougher, and has a glazed appearance. The parallel faces
are of a pale green colour with a reticulation of white lines, enclosing
areas which range from about ~, to + inch in diameter, mostly poly-
gonal in form. The specimen was of irregular triangular shape, and
the sides and edges formed by cracks, probably produced at an early
period of the heating process, are of a uniform greenish-white or pale
greenish-grey tint. ‘The hardness appears to be slightly greater than
that of the same glass before devitrification, upon which it produces
feeble scratches. A cross fracture, revealing the devitrified interior,
shows very delicate, slightly undulating bands, which agree in direc-
tion with the parallel faces of the plate, and the alternate bands, when
viewed in this direction, exhibit a silky lustre like that of chrysotile,
satin-spar, and other fibrous substances, only rather feebly. At
the marginal extremilies of this fractured surface similar bands
are seen running in a direction at right angles to the others,
and these transverse bands occupy two triangular areas, as shown
in fig. 1.

90 Messrs. D. Herman and F. Rutley.

Fre, 1.

In order to ascertain more precisely the nature of this structure,
three sections were cut :-—

A, at right angles to the parallel faces of the plate.

B, parallel to one of the parallel faces of the plate, and including
between the planes of section little more than the greenish
superficial layer with the white reticulations.*

C, parallel to one of the short sides, passing through one of the tri-
angular areas near one of the angles, so that the section
includes both sets of bands, cutting one set transversely and
lying parallel to the other. These sections exhibit the general
structure admirably when held obliquely m different directions
between the eye and the light.

The folowing is a description of their microscopic characters :—

Specimen No. 115, Section A. When viewed by ordinary trans-
mitted light under a low power, the banding already deseribed is
indicated by transparent or very translucent belts, alternating with
bands of very feeble translucency. Both kinds of belts are traversed
by fine lines, indicating a fibrous crystalline structure, which cora-
monly shows a radiate arrangement, the divergent groups of fibres
emanating from centres situated on or ahout the margin or edges of
the section.f Each radiating group has what may be termed its own
allotment, bounded by well-defined straight lines. The boundary of
one side of an allotment sometimes consists of a single straight line,
at others of two or more straight lines, meeting in very obtuse angles.
The boundary lines are not curved. When the section 1s rotated
between crossed Nicols, these allotments form a well-marked and im-
portant feature. The divisional lines in this section may be separated
into two groups. The first group consists of five lines, viz., a
median line, running parallel to the two parallel faces of the plate-
glass, and four lines which form a bifurcation at either end of this
median line, and enclose the terminal triangular areas. The second
group of lines consists of those boundaries of the crystalline allot-

* This layer is not the original surface, 5}, of an inch having since been ground off.
+ It must, however, be noted that the margin of the section lies about 3; of an
inch from the origina! surface, the }; of an inch hav-ng been removed by grinding.

Microscopie Characters of Devitrified Glass. oF

ments which run approximately at right angles to the surfaces which
constitute the boundaries of the devitrified specimen. In polarised
light the general aspect of the section is peculiar, and strikingly
resembles a patchwork rug made of the skins of tabby cats. Further
on we shall endeavour to account for this brindled appearance, which
is represented in fig. 1, Plate I, as seen between crossed Nicols. The
vertical edge of the section seen on the right of the field is the trace
of one of the parallel faces of the devitrified plate-glass. The
N.W. portion represents part of one of the terminal triangular
areas, while the remainder shows some of the other crystalline allot-
ments.

Specimen No. 115, Section B. This is a particularly interesting
section. It is in fact one of the green surfaces of the devitrified
plate-glass, 7.e., present surface, ~; inch of glass having been ground
away, and we can easily trace in it the polygonal structure already
alluded to. Between crossed Nicols the polygonal areas are sharply
defined and are irregularly clouded with crystalline aggregates, which
appear dark. On rotating the section through 90° these dark
aggregates become light, while the previously light portions become
dark; we are, in fact, looking on the ends of bundles of crystalline
rods. These polygonal areas are the cross sections of fasiculi of
divergent crystals, and the boundaries of these polygons are shrink-
age cracks, giving rise to a columnar structure, while the columns,
like those of basaltic lavas, have their longest axes normal to the
cooling surface. Fig. 2, Plate 1, shows the general appearance of this
section, magnified eighteen linear, between crossed Nicols. Ass it seemed
possible that greater amplification might afford more information
concerning the nature of the little crystals which constitute these
bundles, a +-inch objective was used, with the result shown in fig. 3,
Plate 1. Only dark hazily-defined spots could be discerned between
crossed Nicols, which became light on revolution of the section, while
previously light portions became dark. The section has, in fact, the
appearance of what is known as crypto-erystalline structure, and
resembles, to a certain extent, some of the felstones, which, from other
evidence, are known to have been once vitreous lavas. An examina-
tion of this section proves then that the polygons are the cross
sections of the erystalline allotments of Section A, and that those
allotments are longitudinal sections of polygonal, often pentagonal,
prisms. Whether or not the polygonal jointing is connected with the
crystalline developments, which it sheaths and separates, is a matter
open to discussion. "The Section B, when held between the eye and
candle flame, presents the illusive appearance of being studded with
concayities or convexities, from which it, we think, may be inferred
that the radiate arrangement of the crystalline fasiculi originates at
or about the centre of each polygonal area on the original surface of

32 | Messrs. D. Herman and F. Rutley.

the thick plate-glass.* If so it is possible that the strain consequent
on crystallisation may have produced the prismatic fission. Fig. 1,
Plate 3, might then be taken to represent portion of the surface of |
the slab at the commencement of devitrification, the dots indicating
primary centres of crystallisation, while fig. 2 on the same plate
would represent the development of prismatic structure by the forma-
tion of cracks between and around these centres of crystallisation.
Fig. 3, Plate 3, shows one side (the lower one) of the block, fig. 2 the
arrow denoting the direction in which the crystallisation advances.
Apart from any hypothesis concerning the possible relation of the
prismatic structure to the crystallisation, which may or may not be
true, since it is possible that the prismatic structure was developed
first, it is evident from the inspection of such a diagram that we may
have a section giving prisms of very different widths, the width in
section not necessarily representing the actual width of the prism,
while in such a case the centre and general axis of the crystalline
bundle may appear to be thrown on one side of the prism.

Specimen 115, Section C. This section truncates one of the ter-
minal triangular wedges, of which mention has already been made, so
that here we know for a certainty that we are looking on the cross
section of the crystalline fasciculi belonging to the triangular area,
and here we meet with precisely the same phenomena as those
described and figured for Section B. On either hand the adjacent
crystalline bundles emanating from the upper and under surfaces of
the thick plate are seen lying in the plane of section, 1.e., we are
looking at longitudinal sections of those bundles. In these we
again see the cat-like brindlings. On the broken and partly ground
away edges of this part of the section, a power over 500 linear shows
that the crystalline bundles are made up of small fibres or microliths,
closely packed side by side. The section is in all parts traversed by
long, fusiform, or acicular brownish microliths, which lie with their
longest axes in various directions, but usually across the general
directions of crystallisation.

The brindled appearance in the crystalline bundles of these sections
suggests at first sight the idea of pauses in the crystallisation, but
when we find that by ordinary illumination the light is very faintly
transmitted along these lines, some further explanation seems need-
ful, and it seems probable that in these diverging crystallisations there
is a kind of cone-in-cone or divergent composite structure, such as in
that met with in the kidney-ore variety of hematite, or in clay-iron-
stone, the apices of the cones giving rise to a turbidity and being
ranged so as to form successive arcs of approximately concentric
circles, as indicated in fig. 6, Plate 3. From the evidence afforded by

* The surface of this specimen is 1, of an inch from the original surface, which
has been removed by grinding.

Microscopic Characters of Devitrified Glass. 93

the sections now described, it seems certain that devitrification has in
this instance commenced at the surface, and has proceeded inwards
in directions at right angles to the different surfaces. Owing to its
uniform rate of progression, the different sets of crystalline fasciculi
have met along lines which divide the devitrified mass in a remark-
ably symmetrical manner, as shown in fig. 5, Plate 3, which represents
one corner of the slab. That unequal rate of progression would cause
a deviation from this symmetry 1s shown diagrammatically in fig. 4,
Plate 3, and actually in the deflection of the diagonal line in fig. 1,
Plate 1, Section A.*

Specimen G is a plate of flashed glass, about 24 mm. in thickness,
which has been completely devitrified under conditions similar to
those described for Specimen 115, that is to say, it was imbedded in
silver sand (previously washed and dried), placed in a kiln, and the
temperature gradually increased during a period of eleven days up
to a bright red. This heat was maintained pretty steadily for eleven
days more, after which the kiln was quickly cooled, and the glass
withdrawn. The flashed surface is of a deep blue colour, and is
incrusted with grains of sand. The opposite face is mottled with
small dull green and greenish-white spots, and has a surface like
coarse glazed pottery. Flashed glass was chosen in this case, as it
was thought possible that some of the pigment might be carried
inwards by the crystallisation. This, however, does not seem to have
taken place to any great extent, for on examining a thin section taken at
right angles to the broad surface of the plate under a power of 250 linear,
the blue layer is seen to have remained on the surface, although
its boundary is ill defined, and the bluish tint extends for only a very
little distance inwards, gradually fading away. On the outer surface
of the coloured layer there has, however, been a considerable dis-
turbance of the blue glass, which appears to have been fused, and to
have run between the sand grains against which it was bedded,
ff, Plate 2, fig. 2, forming a cement of blue crystalline sheaves. The
crystalline structure of the blue layer is throughout very irregular,
consisting of similar sheaf-like aggregates and interlacing crystals.
Passing from this layer we find the contiguous glass converted into
radiating crystalline groups, separated by sharply defined joint planes,

* Supplementary Note.—Specimen 115. Thermal conductivity appears to be
uniform on the large parallel faces of the plate, both at the margin and at a distance
from the margin. The isothermal curves are also circles on the sides of the piate at
right angles to the large faces. On a transverse section of the plate which traverses
the crystalline fasciculi in directions both longitudinal and transverse, as in Section C,
the wax also melts in circles both on the area of the longitudinal and on that of the
transverse sections. ‘This accords with the statement of M. Ed. Jannettaz (‘‘ Propa-
gation de la Chaleur,” “ Bull. Soc. Géol. de France,” 3° Serie, t. ix, p. 200) that

minérals having a fibrous or lamellar character do not conduct heat better in the
direction of the fibres or of the lamelle than if they had no such structure.

94 Messrs. D. Herman and F. Rutley.

i). Plate 2, fig. 2, which traverse the plate normal to the large parallel
surfaces. These joints are evidently the boundaries of polygonal
prisms, and it is the ends of these prisms which cause the green and
white spotted appearance on one surface of the specimen, while the
reason that no such marking is visible on the other surface is partly
due to the screen of sand grains which covers it, while beneath there
would be no such markings until we reached the layer of originally
white glass, because the joints do not appear to traverse the irregu-
larly crystalline blue layer. Divergent crystallisations, also bounded
by prismatic joints, start from the green spotted surface of the plate,
and the two sets of divergent crystallisations meet in an undulating
line, Zl., Plate 2, fig. 2, which approximately divides the plate into
two plates of about equal thickness. The joint planes on the opposite
sides of this line do not coincide, and the halves of the plate if sepa-
rated along the surface, of which this undulating line is the trace,
would doubtiess present a mammillated appearance. The general
structure reminds one of that of part of a much flattened chalcedonic
geode. It will be seen that in this specimen the devitrification has
taken place on precisely the same principle as in the thick plate pre-
viously described. There has been a prismatic structure developed
normal to the bounding surfaces, divergent crystallisation occurs
within the prisms, and these crystalline fasciculi advanced in opposite
directions until they arrested one another, but the line of arrest in
this case is sinuous, while in the preceding specimen the lines of
arrest are straight. On examining the section under a power of
50 diameters, fine lines, like small scratches, are seen to cut across
the divergent crystallisation. Under much higher powers they appear
as rod-like microliths, and they lhe with their longest axes in all
directions, but mostly transverse to the divergent fibres.

Specimen I is part of a completely devitrified square prism of plate-
glass. The devitrification of this specimen was brought about by two
separate operations. The whole of the prism, about 4 inches in
length, was bedded in silver sand and heated during four days to a
temperature gradually increasing from that of the atmosphere up to a
red heat, maintained at that for two days more, and then quickly
cooled. When cold it was broken in two and found to be regularly |
devitrified to a depth of about 14 mm., the interior being unaltered.
One of the halves was then burnt again, this time for the same period
and under exactly the same conditions as Specimen G, 1.e., bedded in
sand, brought gradually to a bright red, maintained steadily at that
heat for eleven days, and then quickly cooled. .The faces are of a pale
greenish-yellow, have a glazed appearance like that of pottery, and
are traversed by a network of very fine cracks. When the specimen
is held before a strong light these surfaces present a spotted appear-
ance, similar to that seen on the plane surface of other devitrified

iy “ae

Microscopie Characters of Devitrified Glass. 95

solids. Under the microscope it is seen that the crystallisation has
advanced as usual from the surfaces inwards. After passing through
a distance of about 1} mm. from the surface there has been a pause,
marked by a fairly well-defined line, indicating the extent of the
devitrification produced by the first heating to a red heat. This line
is not straight, but has a series of slight convexities directed inwards,
each convexity being bounded by joint planes normal to the surface.
The prism therefore had first of all a devitrified envelope, the inner
surface of which was mammillated, and each mammillation was the
termination of a small prism. As the crystallisation advanced from
the inner surface of this envelope, a fresh series of less numerous
joints was developed, giving rise to a coarser prismatic structure, and
between these joints we see in section a beautiful divergent crystal-
lisation, each divergent group originating on the imner surface of
the first crystalline envelope, a single prism sometimes containing only
one such group. at others several. The general direction of these
prisms is normal to the surfaces of the devitrified specimen, and the
lines of arrest would join the opposite angles of the square section,
were it not that in this particular slice am irregular pentagonal area
occurs, against four of whose angles the lines of arrest abut. This
irregular pentagon is a transverse section of another set of divergent
erystallisations, whose longest axes would diverge from the axis of
vision, and they evidently emanated from one of the basal planes of
the large devitrified square prism, or from a transverse fracture as the
prism was broken across after the first heating. Had the specimen
been a cube, a section taken parallel to two of its faces and passing
accurately through the centre of the cube,.wouid merely have shown
two continucus lines:of arrest joining opposite angles and intersecting
in the centre of the square secticn, assuming, of course, that the
crystallisation advanced equally from all six faces. Such a structure
would divide the cube into six equal four-sided pyramids, as indicated
in the diagram, Plate 3, fig. 7. In the specimen before us the crystal-
lisation has advanced rather irregularly, and the lines of arrest are
consequently not continuous straight lines, but continuous series of
straight lines, a repetition,.in fact, of the conditions indicated in the
diagram, fig. 4, Plate 3.

Specimen H is portion of a similar square prism of plate-glass,
heated gradually for six days toa red heat under exactly the same
conditions as the first operation on Specimen I. It differs from the
preceding specimen in having been devitrified for only a slight
distance from the surface. A section of the crust through one of the
angles presents an appearance precisely similar in character to that of
the crust of Section EH, (a six-sided prism), figured on Plate 2. These
are groups of divergent crystals which pass from the surface inwards,
and are separated by prismatic jointing. The inner surfaces of each

96 Messrs. D. Herman and F. Rutley.

crystalline group is convex, the convexity being directed towards the
interior of the solid. When magnified between 500 and 600 diameters
these convex surfaces are seen to be fringed by the projecting termi-
nations of the divergent crystalline fibres.

Specimen K. This is part of a completely devitrified trigonal
prism of plate-glass, devitrified by two operations, under precisely the
same conditions as Specimen I, and the section has been taken parallel
to the basal plane. The general principle of devitrification elucidated
by the examination of the preceding specimens may also be clearly
recognised in this case, but the crystallisation, after the first envelope
was formed, advanced in a somewhat irregular manner, which needs
interpretation. The irregularity in the crystallisation of this specimen
may be attributed to the fact that there is a flaw init. The general
structure is shown in Plate 3, fig. 8. Here we notice first of all the
envelope or devitrified crust, due to the first heating operation, in
which there is prismatic structure and a series of divergent crystal-
lisations trending inwards. Next comes a similar but coarser series
of prisms also normal, or approximately normal, to the sides of the
trigonal prism, and in these the divergent crystallisation has also
travelled from without inwards. So far there is no deviation from
the general principles of devitrification which we met with in the pre-
ceding specimens, in fact the crystallisation has proceeded inwards as
usual, in directions approximately normal to the limiting planes of
the devitrified solid. We now meet, however, with an apparent
exception to the general rule, for the three sets of crystalline fasciculi,
instead of continuing their course until they arrest one another in
three straight lines joining the angles and the centre of the triangular
section, are suddenly arrested and enclose an area rudely shaped like
a three-rayed star, this being subdivided into three irregular portions.
The deltoidal areas are traversed by cracks, and from points along
these lines we have groups of crystals diverging on both sides of the
lines. They have consequently travelled from within outwards.

The different areas of devitrification are by no means symmetrically
disposed. Diagram, fig. 8, Plate 3, shows, with approximate truth,
how the parts of the actual section really occur. It will be seen on
reference to this figure, that at the point a there is a crack which
extends in a curve towards b. From a point on the curved line ab,
about opposite to the middle of the edge in which the crack a occurs,
another nearly straight crack passes to c, and from the inner surface
of the devitrified crust a third crack extends in a curve from the little
fissure a to the point d. The crystallisations diverge on both sides of
these three cracks. They are bounded by prismatic joints, which are
continuous across the cracks, and each pair of crystalline fasciculi
diverges from a common centre situate on the crack and between a
pair of prismatic joints. These three distinct areas of crystallisation

Microscopic Characters of Devitrified Glass. 97

are very irregular in form, and this has already been attributed to
the presence of the flaws emanating directly and indirectly from the
fissure. There appeared to be no reason why in such a solid the
devitrification should not proceed steadily inwards until the three sets
of prisms arrested one another along three lines passing from the
three angles of the triangular section, and meeting in its centre.

With a view to settling this point another trigonal prism (Specimen
No. 143), free from any flaws, was devitrified. A transverse fracture
through this devitrified prism shows three distinct and similar areas
of crystallisation ; each is an isosceles triangle. These triangular areas
are bounded by the three sides of the prism and by three straight lines
of arrest, which accurately join the centre or axis of the prism with
its three angles or edges, fig. 9, Plate 3. This demonstrates conclu-
sively that the irregular devitrification seen in Section K is due to
simultaneous crystallisation along flaws.

Specimen D heated twice under same conditions as Specimens I and
K, is part of a completely devitrified six-sided prism of plate-glass.
The surface has a glaze like that of pottery. The transverse section
of the prism is not a perfect hexagon, and it has not been cut quite
at right angles to the principal axis. There is a well-marked crust of
divergent crystalline fasciculi due to the first short heating, prismatic
joints being also present, but they are not well defined. Devitrifica-
tion has then proceeded inwards in directions approximately normal
to the lateral faces of the prism in broad divergent crystalline groups,
separated by joint planes, which preserve at the best a very imperfect
parallelism. In fact the prismatic structure which they indicate seems
very irregular, and in the section a prism is often represented by a
lanceolate or an irregularly shaped area, while the divergent crystal-
lisations do not all seem to be formed in directions parallel to the
plane of section. These crystallisations show brindled markings,
similar to those seen in Specimen No. 115. There is strong chromatic
depolarisation in this, as also in the preceding Sections I and K.

Specimen EH is part of a six-sided prism of plate-glass, 2 cm. in
diameter, which has been devitrified to a depth of barely 15 mm.
under precisely the same conditions as Specimen H. The devitrified
crust 1s yellowish-white, and has a glazed surface like that of pottery.
Two sections have been cut from this specimen, E being taken
transversely to the principal axis, and E, parallel to it and to one of
the faces of the prism. The latter section consists, in fact, only of
the devitrified crust of one of the faces of the prism.

Section H, taken transversely to the principal axis of the six-sided
prism, shows a devitrified crust, which by reflected light looks white,
while by transmitted light it appears under the microscope of a brown
or yellowish-brown tint. It consists of divergent groups of very
delicate acicular crystals, but even under high powers their termina-

VOL. XXXIX. H

98 Messrs. D. Herman and F. Rutley.

tions, where they shoot into the unaltered glass, cannot be clearly
made out. In most cases their terminations appear to be rounded,
while in others they have a rectangular aspect, suggestive of a basal
plane or an edge normal to the principal axis. The groups are not
separated by prismatic joint planes, but the divergent crystals of
adjacent groups appear to slightly overlap. The directions of extinc-
tion indicate that they are possibly rhombic forms. When magnified
about 570 diameters the individual crystals seem frequently to consist
of linear aggregates of minute globulites, but this appearance is
possibly deceptive, and in some cases the crystals exhibit no such
structure. The terminations of the crystals pass rather irregularly
into the adjacent glass, giving the edges of the crystalline groups a
fringed aspect somewhat like the pile of velvet. The adjacent glass
shows colourless spheroidal specks or globulites.

Section E, is taken parallel to one of the faces of the six-sided
prism, and is, indeed, a shaving of the devitrified crust. Mr. Cuttell
succeeded in making a section the full size of the face, and from this
the drawing, fig. 1, Plate 2, was made. In this drawing a basal and
lateral edge are shown, and it will be seen that from these edges
divergent groups of crystals pass inwards. With the exception of
this fringe, which represents more or less oblique sections of the
zrystalline groups which constitute the devitrified crust, the re-
mainder of the face shows only a polygonal network, the polygons
being the cross sections of prisms. It has, in fact, the same structure
as the margin, only the crystalline groups are in this part cut trans-
versely to the direction of their growth, while at the margin they are
cut obliquely, for the section being taken a little distance inwards
from the surface of the face trenches slightly upon the crystalline
groups of the adjacent faces, both lateral and basal. The section as
originally cut was so feebly translucent that an endeavour was made
to reduce its thickness. This, however, resulted in its almost total
disintegration along irregular cracks without materially increasing
its translucency.

Specimen F. This is a completely devitrified sphere of light-
coloured bottle-glass 18 mm. in diameter, devitrified in two operations
under the same conditions as Specimens I, K, and D. Under the
microscope a section taken through the centre of the sphere shows a
somewhat irregular circumference, which is accounted for when the
surface of the original specimen is carefully examined, for it is seen
to be pitted with numerous small cavities, and to have a rough fritted
and imperfectly glazed aspect. The irregularities of this surface are
due to the impressions of sand-grains, a few of which may still be
detected adhering to the surface. The glass has evidently undergone
incipient fusion, and the crystallisation im the immediate neighbour-
hood of the sand-grains is very small and confused. This irregularly

Microscopie Characters of Devitrified Glass. 99

crystalline margin is bounded internally by a sinuous crack, showing
the extent of the devitrification produced by the first heating to which
the specimen was subjected, while other irregular cracks traverse this
portion circumferentially as a rule, but they sometimes pass through
the margin radially. The latter are few, penetrate but a short
distance, and are mostly fringed by delicate crystalline fibres normal
to the crack, and usually terminate in a radial group of fine acicular
crystals or fibres. In one or two spots the cracks are seen to follow
the contours of small cavities, from which sand-grains have been
stripped in the process of grinding the section. Inside the wavy
circumferential crack the crystallisations have shot inwards in long
divergent groups, which towards the middle portion of the sphere
give place to large irregular radiating groups of crystals, so large,
in fact, that there does not appear to be more than half-a-dozen of
them in the section, and these are in most instances cut through in a
plane remote from their centres, thus giving oblique and transverse
slices through the crystalline rods. Had these groups been able to
erystallise freely they would have resulted in spherules, and this,
indeed, might have been the case had the devitrification of the
sphere been incomplete ; as it is, they seem to have rudely polygonal
boundaries. The devitrification of this specimen seems in part to be
of a micro-crystalline-granular character under a magnifying power of
18 linear, but under a power giving an amplification of 570 diameters
this is seen not to be the case, the mass being resolved into a closely
matted aggregate of little acicular crystals with a general tendency
to radiate grouping, as shown in fig: 4, Plate 1. In fig. 5 on the
same plate the general aspect of a portion of the sphere at and near
the margin is shown. The circular hole near the margin is where a
sand-grain, around which the glass has fused, has been stripped out
in grinding.

Specimen No. 78 is portion of a large hemispherical mass of com-
pletely devitrified sheet-glass taken from a mass of many tons which
burst from the furnace in the liquid state and ran into a ‘“‘ cave”
underneath. ‘The mass solidified rapidly, but owing to its great bulk
remained at a high temperature for several days. In the specimen
there is a fragment of uncombined lime, indicating that at the spot
from which the specimen was taken the fusion of the raw materials
composing the glass was not quite complete. This specimen exhibits
@ curious and very rough concentric scaly or platy structure. It is
of a pale greenish-white tint, and the broken surfaces are covered
with small glistening hair-like crystals. It feels rough to the touch
lke a piece of unglazed porcelain, which it rather resembles, and it
has a distinctly vesicular structure. The vesicles are spherical. In
thin section it is very feebly translucent, and consists of a mat of
minute groups of radiating crystals. The aspect of the surface of a

H 2

100 Messrs. D. Herman and F’. Rutley.

roughly broken piece of this specimen magnified four diameters is
shown in fig. 5, Plate 2.

Specimen No. 105 is a piece of plate-glass 12 mm. in thickness,
having the uneven surface usual in plate-glass before it has undergone
the process of grinding. Devitrification in this case has given to the
glass the appearance technically known as “‘ burnt,” and it was brought
about in the ordinary process of annealing owing to the kiln being too
hot. The glass was in the stiff, pasty condition suitable for rolling
when introduced into the kiln, and was kept at a bright red by flame
playing almost directly upon it for about half an hour, during which,
and possibly during a short period of subsequent cooling, the devitri-
fication was effected. The devitrification of this specimen is quite
incipient, and affects merely the two parallel surfaces, one of which
is uneven and scratched owing to contact when in a soft condition
with the rough bed of the kiln. This latter surface is extremely
interesting, as it shows a reticulating series of irregular cracks,
traversed in places by straight belts of spherules which are apparently
in no way connected with the cracks, and begin and end abruptly in
a@ seemingly capricious manner, fig. 4, Plate 2.* The cracks are
similar to those produced in glass by heating it and plunging it in
water. Other isolated and larger spherules are also to be seen upon
both surfaces of this specimen. Fig. 3, Plate 2, shows one of these
surfaces—the upper, as seen by ordinary transmitted light, and
magnified 32 linear. The shaded spots represent incipient spherules
which fail to show any depolarisation ; the darker spots are decided
spherules with strong depolarising power. The unshaded portion of
the section also transmits light between crossed Nicols, and is therefore
in a state of strain. Under a magnifying power of 1150 diameters
the incipient spherules can merely be resolved into brownish granular
patches, sometimes approximately round, not uncommonly dumbbell-
shaped, or like two coalescing spheres, but usually they are of irregular
form, and their general aspect is nebulous.

Specimen L. A piece of pale greenish sheet-glass transferred, when
in the semi-fluid state suitable for working, to a small pot in which it
was maintained during four or five hours at a temperature barely
sufficient to permit of its being “gathered.” It is traversed by
rudely parallel, irregular, flocculent, milky bands. Under a power of
about 250 diameters numbers of minute crystallites are visible; they
show no double refraction. Some are stellate, others fusiform or
acicular. The latter are often wholly or partially surrounded by fine
dusty segregations, which frequently seem to be diminutive divergent
spicules. The most common forms have the aspect of monoclinic or

* This specimen closely resembles some of the spherulitic obsidians of Montana,
U.S. Compare this figure with fig. 5, Plate XX, “Quart. Journ. Geol. Soe.,”
vol. xxxvVil.

Microscopie Characters of Devitrified Glass. 101

triclinic crystals. Their angles vary considerably ; one gave ]50°,
another 116°, but these measurements are of little value, as it is
doubtful whether the individuals measured were lying parallel with
the planes of section. Some of these forms are shown in fig. 6,
Plate 2, not represented as they are actually grouped in the prepara-
tion, but selected from various spots. They closely resemble some of
the crystallites met with in the slags of blast furnaces. They occur
in the white turbid bands in the glass, the transparent portion being
almost free from them.

Specimen M is a piece of clear sheet-glass, about 2°5 mm. thick,
from a pot containing somewhat less lime than usual. Owing to the
furnace being rather cold during the time the glass from this pot
was being worked, devitrification in the form technically known as
“‘ambitty ” set in, and increased to such an extent that blowing was
stopped and the pot emptied by lading. ‘The specimen was blown
shortly before the ladling operation was commenced; it contains a
few very beautiful crystallites similar to those figured in Plate 8 of
Vogelsang’s “ Krystalliten.” One of them, which closely resembles
one of the usual forms of snow-crystals, being a skeleton hexagon or
six-rayed star, gives angles of 60° between the component crystalline
needles. These exhibit double refraction, and undergo extinction in
directions parallel to and at right angles to their longest axis. Between
crossed Nicols depolarisation from strain is visible in the adjacent glass,
the minute brushes of light being more intense about the points of
the principal needles. It would appear from the depolarisation and
directions of extinction that this crystallite may be referred to the
rhombic system, twinned somewhat after the manner of chrysoberyl.
This seems the more probable, since some of the forms in Section L
also resemble certain rhombic forms. The crystallite just described
is seen when examined under a power of about 280 linear to be
traversed by an irregular network of strong cracks lying in the same
plane as the crystallite, and extending nearly to but never beyond its
margin. In the centre of the crystallite is a dark spherule. The
fact that the reticulating cracks are restricted to the area occupied by
the crystallite indicates a relation to the latter, and the depolarisation
of the adjacent glass indicates strain. Since this strain-depolarisation
only occurs at the margin of the crystallite, we may infer that the
strain is connected with its development, and the cracks are no doubt
the result of this strain. Had the body been a completely developed
crystal and not a skeleton form, the strain would probably have
resulted in the development of a perlitic crack, and not in a reti-
culating series of cracks which possibly arise from strain about a
number of points. Another crystallite in the same piece of glass is
very different in appearance to that last described; its general out-
line is that of an irregular hexagon. It is traversed by four well-

102 Messrs. D. Herman and F. Rutley.

marked crystalline rods, apparently composed of piles of octahedra
like those of alum, and where they touch the margin of the crystal
they usually pass beyond it, forming little spicular crystallisations
like fir-trees or like the crystals formed in cast iron. They throw out
branches at right angles to the main spicule. The crystallite is also
traversed by other crystalline rods of a like character, but at right
angles to the first set, and these also pass out in little fir-tree-like
crystallisations. There are also small rods which run in two direc-
tions obliquely to the former, and which intersect in an angle of
about 87°. The form therefore is not cubic, as might at first sight be
thought. The larger spicule also show double refraction. There is
some depolarisation in the glass around this crystallite due to strain,
but no cracks are developed. The spicule extinguish parallel to and
at right angles to their longest axes. At least they appear to do so,
but it is difficult to tell, and the colour difference is so slight when a
Klein’s plate is employed that it is impossible to speak with any
certainty on this point. On the whole we are inclined to regard these
crystallites as belonging to the rhombic system. The one last de-
scribed is a twinned form, and exhibits several re-entering angles.
A rough sketch of it (fig. 2) is appended.

Fie. 2.

Microscopic Characters of Devitrified Glass. 103

Generalisations.

From the microscopic examination of the specimens already
described,* it seems evident that the devitrification of solids of
the nature described in this paper takes place in a definite and
apparently uniform manner, to which Specimen No. 105 is no excep-
tion, for the incipient spherules and the well-developed spherules are
but rudimentary phases of the divergent groups which we generally
meet with, and which have been already described. In Specimen 105
they are essentially superficial, and we can imagine them as hemi-
spheres, as represented in fig. 3, ready, as devitrification advances, to be
continued inwards, in which case we cease to recognise their spherulitic

Fie. 3.

character. In solids free from flaws the devitrification appears then,
as a rule, to consist in the development of divergent groups of
crystals, the divergence being usually limited by a network of minute
joints, which give rise to small polygonal prisms. These crystals and
joints extend inwards from the different faces of the solid, and may
or may not ultimately meet. The crystalline groups in their respec-
tive prisms are banded by arcs of circles, which we may assume are
related, but perhaps obscurely, to the initial pseudo-spherulitic struc-
ture of the superficial crust of the solid. These arcs indicate succes-
Sive stages of growth. The crystallisations from the different faces
ot the solid ultimately, in small masses, arrest one another, and
devitrification is then complete. In the case of the sphere, Speci-
men F, already described, the process has gone on in much the same

* With the exceptions of Specimens 78, L and M, in which devitrification was
produced during cooling from the fluid state, and Specimen 105, which was probably

still somewhat soft when devitrification commenced, all the specimens described

were devitrified whilst in the solid state by more or less prolonged periods of
heating.

se

104 Messrs. D. Herman and F. Rutley.

manner for aslight distance from the surface, after which an irregular
crystallisation has been set up from independent centres; but it
should be remarked that difference in the chemical composition is
known to influence the mode of procedure, as well as the character
of the devitrification. The direction of the prismatic structure
always seems to be approximately normal to the surfaces, and the
divergent sheaves of crystals advance from the surface inwards by
successive growths within the prisms. It seems quite possible that
in the absence of such prismatic jointing the whole mass would
become spherulitic, or would consist of an irregular felted mass of
crystallites. The near resemblance which some of the specimens just
described bear to devitrified and partially devitrified obsidians shows
how close the structural relationship is, and that, allowing for difference
in the conditions under which the process takes place, the principle of
devitrification is the same.

Specimen No. 122d, a piece of ordinary sheet-glass, which was
bedded in white sand and heated during a period of only four days to
a temperature gradually increasing from that of the atmosphere up to
a blood-red—a temperature somewhat lower than that employed for
any of the specimens previously described, shows purely superficial
devitrification by the development of globulites and spherules or
spherulitoid crystallites, like fig. 11, Plate 3. In this particular
crystallite, which is of a pale brown colour, no structure can be made
out. It seems merely to consist of an aggregate of globulites, but in
other cases bodies of precisely similar form show a decided radiating
crystalline structure, like that. of the brown spherules, which occur
with them in the same specimen, the only difference between these
crystallites and the spherules consisting in the external form or limit-
ing surface. It is for this reason that we propose to call them
spherulitoid crystallites. Fig. 10, Plate 3, drawn from the same piece
of glass, shows part of the network of cracks by which the surface is
cut up, and the curious manner in which the globulites have segre-
gaved along these cracks, so as to leave the fairiy well-defined circular
and oval spaces in which the globulites are less densely packed.
Spherules sometimes occur within these clearer areas, but the latter
do not seem to have any necessary connexion with the development
of the spherules.

In Specimen No. 1220, superficially devitrified under the same con-
ditions as the preceding, a tendency to the formation of perlitic
structure is seen around some of the spherules.

Specimen 126, a piece of rough plate-glass, $ inch thick, bedded in
white sand, contained in a small fire-clay pot, and placed in a kiln,
the temperature of which was gradually raised during a period of
83 days, by which time a dull red heat, about 650° C., was attained.
As it was known by comparative experiments with similar pieces of

Microscopie Characters of Devitrified Glass. 105

glass contained in other pots in the same kiln, that no appreciable
change had taken place in the glass up to this time, we propose to
reckon, in this and subsequent experiments, what may be called the
active period of devitrification, from the first attainment of 650°,
neelecting altogether the time required to bring the specimen up to this
temperature, which necessarily varies in different cases, and is known
to be without appreciable effect on the glass. The pot containing Speci-
men 126 was withdrawn from the kiln 29 hours after its first attaining
the temperature of 650°, by which time the heat had slightly increased.
The pot with its contents was allowed to cool during about four hours,
when the glass was removed from its covering of sand, which had
cooled down almost to the atmospheric temperature. This specimen
shows devitrification only on the surfaces, the alteration being so
slight that writing can be clearly read through the glass when it is
placed close over it, but when raised an inch above the writing the
latter appears blurred and illegible. The devitrification, which is
quite incipient, consists in the segregation of vast numbers of minute
granules and globulites about various points ou the surface of the
glass, and in very many cases small stellate crystallites lie in the midst
of these segregations. They are colourless and translucent, but too
small to show any double refraction, even if they possess the property.
Under an amplification of 120 linear the specimen shows portions of
its surface which are still quite clear and unaltered. The margins of
the unaltered areas show some fine nebulous segregations which
envelope no crystallites, but the majority contain the stellate forms
already alluded to. Of these, the simplest form is a four-rayed star
_or cross, the arms of the cross being apparently at right angles, but
most of these crystallites are many-rayed, as shown in fig. 13, Plate 3,
which was drawn with a magnifying power of 820 linear. On the top
and left hand margin of this drawing portions of a crack are shown,
and on certain parts of the surface of this specimen the nebulous and
crystallite-bearing spots are separated by a network of irregular
cracks.

Specimen 127, a piece of polished plate-glass, ? inch thick, treated
in the same pot as Specimen 126, and under exactly the same con-
ditions. This is another instance of incipient and purely superficial
devitrification. The general appearance is somewhat like that of
No. 126, but in this case, although a few imperfectly developed
spicule are present, there are no distinct stellate crystallites, possibly
because in glass of this kind, containing a considerable quantity of
lime, stellate crystallites do not occur so frequently as in the quality
represented by Specimen 126, and the alteration of the glass consists
merely of delicate nebulous spots, which under a power of 820 linear
are seen to be composed wholly of globulites, and this is the most
rudimentary phase of devitrification touched upon in this paper.

106 Messrs. D. Herman and F. Rutley.

The little nebulous patches are mostly circular in form, and these
circular patches often coalesce. There are a few instances in which
the globulites occur within sharply defined circular or approximately
circular boundaries, but for the most part the nebulous patches shade
gradually away into the glass. One of these patches magnified
820 diameters is shown in fig. 12, Plate 3. The structure fore-
shadowed in this and in Specimen 126, may be regarded as
spherulitic.*

Specimen No. 147 is especially interesting on account of the per-
fect manner in which it demonstrates that devitrification takes place
from the surfaces of a crack, just as from any other surfaces. The

* A very interesting example of a like structure, but on a much larger scale, is
seen in a specimen of obsidian collected by Mr. John Arthur Phillips, at Hot
Springs, near Little Lake, in California. The obsidian is black and contains several
greyish-white, or yellowish-white, spheroidal bodies (lithophysen of Richthofen),
which range up to an inch in diameter. These, when examined carefully, are seen
to consist of numbers of small spherules, about 5 of an inch in diameter, but many
of still smaller dimensions. The minute spherulitic structure of these large spherules
is best seen on weathered surfaces, but even on fractured surfaces the spherules may
still be seen, though their spherical character is less clearly visible, owing to inter-
stitial matter, which becomes removed by weathering. In these larger spherules
there is evidence, though obscure, of a radiating structure. The mimicry of the
little spherules built of globulites, in Specimens 126 and 127, by these large
spherules built of little spherules, in the obsidian, is very striking, but it is quite
probable in the latter case that the smaller spherulitic structure was set up in the
large spherule after its formation, the vestiges of a radiating crystalline structure
tending to confirm this view.

Weathered surface of large spherule.

Obsidian.

Part of iarge spherule in obsidian from Hot Springs, near Little Lake, California.

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Microscopic Characters of Devitrified Glass. — 107

specimen is a slab of 3-inch British plate, about 4 inches by 3 inches
in diameter, and upon one of its surfaces a straight cut or scratch,
about 2 inches long, was made by a diamond, producing an exceed-
ingly fine crack, extending at the edge of the plate to a depth of over
4 inch in a direction approximately normal to the surface upon which
the scratch was made, and gradually dying out to the end of the
diamond cut. The crack was sufficiently fine to show Newton’s rings.
The specimen was then completely devitrified by heating continuously
for nine days at a bright red heat, a temperature considerably
higher than was employed in the case of Specimen 126, 127, and
it was subsequently cracked across in the direction of the line
marked BB in fig. 1, Plate 4. Fig. 2 represents the fractured
surface. At each end are the usual triangular areas, formed by lines
of arrest, but the line of arrest which usually joins the apices of
these triangular areas is here interrupted by another series of crystal-
lisations which have emanated from the crack produced by the
diamond scratch. In the half of the plate nearest to the scratched
surface we have, indeed, a reproduction of what has taken place at
the outer edges of the plate, the result being a nearly equilateral
triangular area of crystallisation, bisected by the crack already men-
tioned. This crack, however, passes a little beyond the median line
of arrest, and from its termination the crystallisation radiates and
ends against a curved arrest line, as shown in fig. 2, Plate 4.

That devitrification does not always proceed in the orderly and
uniform manner seen in Specimens 115, 147, and, indeed, in nearly
all of the examples already described in this paper, will be best
realised by reference to the figures of Specimens Nos. 132 and 136 on
Plate 4, figs. 4 and 5. Fig. 3 in the same plate, Specimen No. 137, is
a small slab of glass partially devitrified. The crust has been formed in
the usual way by crystallisation proceeding from the surface inwards,
but the process has been arrested, and where the outer crust is broken
away a core of somewhat cracked but perfectly clear glass is seen, in
which no spherules or other crystalline bodies are visible. In Speci-
mens 132 and 136, however, the result has been different, for after
a shght external crust has been formed, devitrification has also
started from numerous points within the glass, giving rise to a well-
marked spherulitic structure.

Why these spherules have been formed instead of a gradually
increasing crust is a matter which we hope to explain in a subsequent

paper.

108 Dr. W. Huggins.

THE BAKERIAN LECTURE.—“On the Corona of the Sun.” By
Witu1am Huaains, D.C.L., LL.D., F.R.S. Received June
11, 1885. Read June 11, 1885,

Tlepi S€ tov ypovov, dv év TH “ENAGOt eveorrovdalev, emeixe TOV ovpavoy Stoonpia
ro.aitn, Tov Tov “HXlov KuKAov mTepicAO@v orépapos, c€oiKas “Ipidt, THY akTiva
nuaupov.

Philostratus, ‘ Life of Apollonius,” bk. vill, ch. xxii
(ed. Leipzic, 1709).

"AAAG trepupaiverat tis avyl Tmept THY trvy, adK E@oa Babeiay yiverOar THY oKLaV
Kal akparov.

“ Plut. Opera Mor. et Phil.,” vol. ix, p. 682
(ed. Leipzic, 1778).

The sun is the only star the corona of which we have been able to
observe, for all other stars are too distant to give true images in the
telescope. If the sun were removed to a distance equal to that of the
nearest star, its disk would subtend less than the one-hundredth of a
second of arc. We have also to consider the small relative brightness
of the corona, the ight from which has been estimated at different
times to be from zg5455 to about the z5g555 part of the sun’s light.
It is, indeed, possible that stars which have a higher temperature
than our sun, are surrounded by corone of greater extent and bright-
ness.

At the eclipse of 1882, some information was obtained of the sun’s
condition in relation to that of the brighter stars. The photographs
of the more refrangible part of the spectra of stars, which I had the
honour to lay before this Society in 1879,* gave a clue by which the
stars could be arranged in a serial order, at the head of which stand
the bright stars Vega and Sirius. I ventured to suggest that the
differences in their spectra might be due primarily to temperature ;
and even to make the further suggestion, that the hotter stars were
probably the younger stars, and that we had obtained possibly some
indications of the relative ages of the stars. The position of the sun
came some distance down in the series, very near the position of
Capella, and just above the stars which begin to show a yellow tinge
in their light. In the ordinary solar spectrum it is difficult to
distinguish the ultra-violet group of hydrogen lines, upon the
character of which this serial arrangement was mainly based, but in
the photograph of the spectrum of the corona obtained during the
Egyptian eclipse, Captain Abney and Professor Schuster have been
able to recognise very thin bright lines corresponding to the lines of
this group.t These lines were not due to the corona, but to

* “Proc. Roy. Soc.,” vol. 30, p. 20; also “ Phil. Trans.,” vol. 171, p. 669.
+ “Phil. Trans.,” 1883, p. 267.

On the Corona of the Sun. 109

prominences at the base of the corona. ‘The thin condition of these
lines, as well as the breadth of the lines of calcium at H and K, confirms
the position which I had ventured to give to the sun relatively to some
of the brighter stars, namely as belonging to the least fervid of the
white stars, and just above those which begin to show a yellow light.

There are indeed some stars in the spectra of which the line D,
which is seen in the prominences, and in the lower parts of the corona
of the sun, appears as a bright line, but this may be due to gas below
any true corona, which may be about these stars.

There are also the so-called nebulous stars, which are surrounded
by an aureole of faint light of measurable angular extent, butit would
seem more probable that these belong to, and should be discussed with,
the clusters and nebule, and should not be regarded as exhibiting a
corona of the nature of that which surrounds the sun.

So far then as our present powers of observation go, the corona of
the sun stands alone; it is therefore the more to be regretted that the
observations of this object are beset with great and peculiar difficulties.
The absorption and scattering of the sun’s light by our atmosphere,
amounting according to Professor Langley to nearly 40 per cent.,*
which are essential to the maintenance of the conditions under which
life, as it now exists, is possible upon the earth, comes 1m, in this case,
so seriously to our disadvantage that the corona can be seen for a few
minutes only at long intervals. It is only on the rare occasions when
the moon coming between us and the sun cuts off the sun’s light from
the air at the place where the eclipse is total, that we can see the
corona through the cone of unilluminated air which is inshadow. On
an average once in two years, for from three to six minutes, the corona
is visible, and then only over a very narrow strip of the earth’s surface.
It is not surprising that many attempts have been made to observe the
corona without an eclipse. The earlier attempts were based upon the
hope that if the eye were protected from the intense direct lightof the
sun, and from all light other than that from the sky immediately
about the sun, the eye might become sufficiently sensitive to perceive
the corona. In the later attempts, success has been sought for from
the great diminution of air-glare which takes place at high elevations,
when the denser and more dusty parts of the atmosphere are left below
the observer. Professor Langley made observations on Mount Etna,
and also on Mount Whitney, 15,000 feet high. He says:—‘I have
tried visual methods under the most favourable circumstances, but
with entire non-success.” Dr. Copeland, assistant to Lord Crawford,
observed at Puno at a height of 12,040 feet. In his report he says:
—‘“It ought to be mentioned that the appearances produced by the
illuminated atmosphere were often of the most tantalising description,

* “ Amer. J. of Science,” September, 1884.
+ Copernicus, vol. 1ii, p. 212.

110 Dr. W. Huggins.

giving again and again the impression that my efforts were about to
be crowned with success.”

The spectroscopic method by which the prominences may be seen
without an eclipse, fails for the corona, because a small part only of
the coronal light is resolved by the prism into bright lines, and of these
lines no one is sufficiently bright and coextensive with the corona to
enable us to see the corona by its light.

Let us look at some of the conditions of the problem. As the
obstacle to our seeing the corona consists of the bright screen of
illuminated air which comes in before it, it is of importance to
consider the relative degree of brightness of the air-glare, under
favourable conditions, to that of the corona behind it.

During the eclipse of 1878, Professor J. W. Langley found the
apparent brightness of the coronal light at 1’ from the limb of
the moon to be six times greater than that of the full moon, but at
3’ distance, the light to have fallen off to one-tenth of the light
of the full moon.* Professor Harkness concludes for the same
eclipse :—(1.) The total light of the corona was 3°8 times that of the
full moon, or 0:0000069 of that of the sun. (2.) The coronal light
varied inversely as the square of the distance from the sun’s limb.
(3.) The brightest part of the corona was 15 times brighter than the
surface of the full moon. (4.) The corona of December 12, 1870,
seems to have been 7} times brighter than that of July 29, 1878.+
In his report on the eclipse of 1883, M. Janssen says :—‘‘ Cette ex-
périence a montré qu’a Caroline lillumination donnée a été plus
grande que celle de la pleine lune.” t

The chief point of importance for this inquiry lies not so much in
the actual value of the coronal light as in the relation of that value to
the brightness of the illuminated air near the sun. Many observers
have borne testimony to the continued visibility of the corona for
some minutes (from three minutes to twelve minutes) after the end of
totalty.

The observations which give to us direct information on this point
are those which have been made of the planets Venus and Mercury
when they come in between us and thesun. It is obvious that as the
planet approaches the sun it comes in before the corona and shuts off
the light which comes from it. Under these circumstances the
observer sees the sky in front of the planet to be darker than the
adjoining parts, that is to say, the withdrawal of the coronal light
from behind has made a sensible diminution of the brightness of the
sky. It follows that the part of the sky about the sun, behind which
the corona is situated, and to which its light is added, is brighter than

* Washington Observations. Reports of Solar Eclipses, 1878 and 1880, p. 214.

+ Ditto, p. 392.
{ ‘Annuaire pour l’An 1884”’ (B. des Longitudes), p. 875.

On the Corona of the Sun. 11!

the adjoining parts, in a degree not far removed from the eye’s power
of distinguishing adjacent areas which differ by a small degree of
brightness.

If, therefore, by any method of observation even a small advantage
could be given to the coronal light as compared with the air-glare,
and, especially, if, at the same time, we could by any method
accentuate the small difference of illumination, a method might be
found by which the corona could be observed.

When the report of the photographs taken during the Egyptian
eclipse of 1882 reached this country, I was led to conclude that the
coronal light as seen from the earth was strong in the violet, and
probably to some extent also in the ultra-violet part of the spectrum.

Apart from the question of the greater relative intrinsic intensity
of the more refrangible region of the coronal light as a whole, or of
any one of its components (its gaseous component gave bright lines
in the violet region), there are two considerations which show us that
the coronal light should be strong in the violet as compared with the
air-glare near the sun. |

The selective absorption of our atmosphere would cause the light
scattered by it in the near neighbourhood of the sun to be relatively
poor in this part of the spectrum; but there is a second cause acting
in the same direction, which arises from the selective power of absorp-
tion of the sun’s atmosphere. .

The absorption which the photospheric light suffers from the solar
atmosphere has been investigated by Professor Langley, Professor
Pickering, and especially with great minuteness by Professor H. C.
Vogel. Vogel found that while at the edge of the sun’s disk the red
hght was reduced to 30 per cent. of its value at the centre of the disk,
the violet light was reduced to 13 per cent.

Vogel sums up by saying that if the solar atmosphere were removed,
the brightness of the violet part of the sun’s ight would be increased
about three times, but the red light one and a-half times only.* The
selective action would doubtless be more strongly marked beyond
the visible limit.

The rapid increase of absorption near the sun’s limb, in Vogel’s
observations, indicates a low and dense solar atmosphere. Professor
Langley agrees in this view of the sun’s atmosphere. He says, “‘ The
portion of the (sun’s) atmosphere chiefly concerned in absorption, I
have been led to believe, from several considerations, is extremely thin,
and I am inclined to think is mainly identical with the reversing layer
at the base of the chromosphere.”’

Professor Hastings also considers the “layer which produces absorp-

* “Spectralphotometrische Untersuchungen.” ‘ Monatsbericht der K. Ak. d.

Weissenschaften.” Berlin, Marz, 1877. Also “‘ Ueber die Absorption der chemicale
wirksamen Strahlen in der Atmosphire der Sonne,” ¢did., Juli, 1872.

112 Dr. W. Huggins.

tion to be very thin,” but he prefers to regard this layer as consisting
not of gas, but of “a thin smoke-like envelope of precipitated
material.”* Professor Pickering assumes the existence of an absorb-
ing atmosphere about equal in height to the sun’s radius, but we
shall see further on that there are reasons which make this supposition
extremely improbable. )

The light emitted by the corona, whether by the incandescent
particles or by the gas mingled with them, which lies outside the low
region of absorption, will not have been subjected to the same selective
absorption as the photospheric light which is emitted below this
region. For this reason the light emitted by the corona will be richer
in the more refrangible rays than the sun’s light before it enters our
atmosphere, and will be in a still larger degree richer in these rays
than the solar light which has been scattered by our atmosphere near
the sun. These considerations led me to hope that if the corona were
observed by this kind of light alone it would be at some advantage
relatively to the air-glare which comes in before it. It was of import-
ance at the same time to magnify the smali advantage the coronal
light might have by some method of observation which could bring
out strongly minute differences of illumination. Such a power is
possessed by a photographic surface. I took some pains to satisfy
myself ‘“‘that under suitable conditions of exposure and development
a photographic plate can be made to record (strongly) minute
differences of illumination existing in different parts of a bright
object, such as a sheet of drawing paper, which are so subtile as to be
at the very limit of the power of recognition of a trained eye, and as
it appeared to me, those which surpass that limit.” +

* “ Constitution of the Sun,” “ Amer. J. of Science,” vol. xxi, p. 33.

+ “Proc. Roy. Soc.,” 1882, p. 411.

Professor Stokes has suggested the following method of increasing the intensity
of that part of the coronal light which is polarised relatively to the glare from the
sky. He says in a letter, which he permits me to add here :—‘‘ The light of the
corona is known to be strongly polarised, while the atmospheric glare would show
no sensible polarisation. Let p be the intensity of the coronal light along any
radius vector which is polarised radially, and gq the intensity polarised tangentially,
and let 2a be the intensity of the glare. Then, without polarising the light, the
intensity of the coronal light relatively to the glare would be as p+ q to 2a. Suppose
now the light falling on the plate to be polarised, say, in a north and south plane.
Then north and south the ratio of the coronal light to that of the glare would be
increased to p to a, while in east and west directions it would be reduced to qg to a.
In north-east and south-west as well as in north-west and south-east directions, the
ratio would be the same as without polarisation. If in four successive photographs
the plane of polarisation were set to north, north-east, east, south-east, we should
get a relative increase in coronal light, in one or other of the photographs, all round
the sun. It would be least in north-north-east, east-north-east, &c., directions,
where it would be p cos*223° + q sin? 223° to a, or about 0°85p + 0'15q to a.

“The most convenient way of polarising would probably be to use a Nicol of some
size not far from the plate.”

On the Corona of the Sun. 113

In my early experiments I made use of coloured glass, or a cell
containing a coloured liquid, for the purpose of isolating the violet
part of the spectrum,* but afterwards I obtained the desired light-
selection in the film itself by the use of argentic chloride, which
Captain Abney had shown to be most strongly sensitive to light from
h to a little beyond H.¢ Plates prepared with argentic chloride
possess a further advantage for this work in consequence of the
greater steepness of their gradations of density corresponding to
differences of light-action as compared with argentic bromide plates.

When very small differences of illumination only, existing close
about a body so enormously bright as the sun, have to be photographed,
the most minute precautions have to be taken to avoid false effects
upon the plate, which may arise from several causes. Lenses should
not be used to form the sun’s image on the sensitive surface, in con-
sequence of possible false light about the image which may come from
outstanding aberrations, though they have been corrected for photo-

_graphic work, and from reflections at the surfaces of the lenses. I

therefore employed a mirror of speculum metal. . Other necessary
precautions are described in my paper, namely, the position of the
shutter very near the focal plane; protecting the sensitive surface
from the sun’s direct light by a metal disk a little larger than the
sun’s image; placing before the apparatus a long tube fitted with
diaphragms to prevent light from the sky, excepting near the sun,
from entering the apparatus; backing the plates with asphaltum
varnish ; and some others.t

In my experiments in 1882 I used a Newtonian telescope by Short,
but afterwards a fine mirror made by the late Mr. Lassell, which was
so arranged that the image was formed directly upon the plate without
reflection from a second mirror.§

About twenty plates were taken in 1882, in all of which an appear-
ance more or less coronal in character is to be seen about the sun’s
image. After a very critical examination of these plates, in which I
was greatly helped by the kind assistance of Professor Stokes and of
Captain Abney, there seemed to be good ground to hope that the

* “Proce. Roy. Soc.,”’ vol. xxxiv, pp. 411, 412.

+ “ Proc. Roy. Soc.” vol. xxxiii, p. 175.

~ “Proc. Roy. Soc.,” vol. xxxiv, p. 409, also Report Brit. Ass., 1883, p. 348. See
also the photographic experiments of Dr. Lohse, “ Vierteljarsschrift Ast. Gesell.,”
Bd. xv, 8.134. Dr. Lohse sums up an account of his methods and results thus :—
“Es gelang aber dieselben (die Schwierigkeiten) zu tiberwinden und Resultate zu
erhalten welche zu einer Fortsetzung der—hier freilich selten médglichen und mit
grésserem Vortheil in méglichst hoher Lage anzustellenden—Experimenten ermu-
thigen.”

§ “TI am indebted to Miss Lassell for the loan of a 7-foot Newtonian telescope made
by the late Mr. Lassell. The speculum, which is 7 inches in diameter, possesses
great perfection of figure, and still retains its original fine polish, I decided not to

VOL. XXXIX, I

114 Dr. W. Huggins.

corona had really been obtained upon the plates. On one plate
especially forms resembling closely in character those present in the
photographs of the eclipse of that year were visible.

In the following year, 1883, working with the Lassell mirror, I
found that when the sky was free from clouds, but whity from a
strong scattering of the sun’s ght, the sun’s image in the photographs
was well defined upon a sensibly uniform surrounding of air-glare,
but without-any such sudden increase of illumination near the sun’s
hmb, or other indication which might be due to the corona. It was
only when the sky was exceptionally clear that coronal appearances
presented themselves with more or less distinctness.

use more than 33 inches of the central portion of the speculum, partly for the
reason that a larger amount of light would be difficult of management, and partly
because this restriction of the aperture would enable ‘me to adopt the arrangement
which is shown in the diagram.

“Tt will be seen at once from an inspection of the diagram that in this arrange-
ment the disadvantage of a second reflection by the small mirror is avoided, as is
also the mechanical inconvenience of ‘tilting the speculum within the tube as in
the ordinary form of the Herschelian telescope. The speculum 6 remains in its
place at the end of the tube a, d. The small plane speculum and the arm carrying
it were removed. The open end of the tube is fitted with a mahogany cover. In
this cover at one side is a circular hole, f,3z inches in diameter, for the light to enter ;
below is a similar hole, over which is fitted a framework to receive the ‘ backs’ con-
taining the photographic plates, and also to receive a frame with fine ground glass,
for putting the apparatus into position. Immediately below, towards the speculum,
is fixed a shutter, with an opening of adjustable width, which can be made to pass
across more or less rapidly by the use of india-rubber bands of different degrees of
strength. In front of the opening f is fixed a tube, ¢, 6 feet long, fitted with
diaphragms, to restrict as far as possible the light which enters the telescope to that
which comes from the sun and the sky immediately around it. The telescope-tube,
a a, is also fitted with diaphragms, which are not shown in the diagram, to keep from
the plate all light except that coming directly from the speculum. It is obvious
that, when the sun’s light entering the tube at f falls upon the central part of the
speculum, the image of the sun will be formed in the middle of the second opening at
d, about 2 inches from the position it would take if the tube were directed axially to
the sun. The exquisite definition of the photographic images of the sun shows, as
was to be expected, that this small deviation from the axial direction, 2 inches in
7 feet, does not affect sensibly tle performance of‘the mirror. The whole apparatus
is firmly strapped on to the refractor of the equatorial, and carried with it by the
clock motion.”’— Report B. Ass. Advance. Science, 1883 p. 346.

On the Corona of the Sun. 13

The total solar eclipse of May 6, 1883, furnished an opportunity of

comparing the photographs taken with an eclipsed sun with those
taken in this country without an eclipse. On the day of the eclipse
the weather was bad here, but plates taken before and after the
eclipse were placed in the hands of Mr. Wesley, who had had much
experience in making drawings from photographs taken during former
eclipses. Mr. Wesley drew from ‘these plates before any information
reached this eountry of the results obtained at Caroline Island; he
was, therefore, wholly without bias in the drawings which he made
from them. When these drawings were compared afterwards with
the Caroline Island plates, the general resemblance of the corona was
strong, and the identity of the object photographed in Hngland and
at Caroline Island seemed placed beyond doubt by a remarkably
formed rift on the east of the north pole of the sun, which is seen
very nearly in the same position in the English plates and in those
taken during the eclipse. This rift, slightly modified in form, was
found to be present in a plate taken about a solar rotation-period
before the eclipse, and alse on a plate taken about the same time after
the eclipse.*

In 1884, a grant from the fund placed annually by the Government
at the disposal of the Royal Society was put imto the hands of a
committee appointed by the Council of the Royal Society for the pur-
pose of photographing the corona at a place of considerable elevation.
The Committee selected the Riffel, near Zermatt, which has an eleva-
tion of 8,500 feet, and appointed as photographer Mr. Ray Woods,
who, as assistant to Professor Schuster, had photographed the corona
during the eclipse of 1882, and who in conjunction with Mr. Lawrance
had photographed the eclipse of the following year at Caroline
Island.

Unfortunately during this year a very large amount of scattered
light was always present about the sun, arising, it would seem, from

* Report B. Ass. Advance. Science, 1883, p. 348, and Plates XI and XIa.

It seems desirable to put on record here a letter written by Mr. Lawrance to
Professor Stokes, dated September 14, 1883 :—“ Dr. Huggins called upon Mr. Woods
this morning and showed us the drawings Mr. Wesley has made of his coronas. He
told us that he particularly did not wish to see our negatives, but that he would like
us to compare his results with ours. We did-so, and found that some of the strongly
marked details could be made out on his drawings, a rift near the north pole being
especially noticeable ; this was in a photograph taken on April 8, in which the detail
of the northern hemisphere is best shown, while the detail of our southern hemi-
sphere most resembles the photograph taken on June 6; in fact, our negatives seem
to hold an intermediate position. Afterwards I went with Dr. Huggins and
Mr. Woods to Burlington House to see the negatives. The outline and distribution
of light in the inner corona of April 3 is very similar to that on our plate which
had the shortest exposure; the outer corona is, however, I think, hidden by atmo-
spheric glare. As a result of the comparison 1 should say that Dr. Huggins’
coronas are certainly genuine as far as 8’ from the limb.”

I 2

116 Dr. W. Huggins.

finely-divided matter of some sort in the higher regions of the air.
Mr. Woods observed from the Ritffel that when no visible cloud or
mist was present, there came into view a great aureole around the sun,
about 44° in diameter, of a faint red colour at the outside and passing
into bluish-white near the sun. This was clearly a diffraction pheno-
menon showing the presence of minute particles of matter of some
sort in the higher regions of our atmosphere.

The abnormally large amount of air-glare from this cause—even on
the finest days—prevented any success in photographing the corona in
this country, and went far to counteract the advantages of being
above the denser strata of air which Mr. Woods would have gained on
the Riffel under ordinary circumstances.

Mr. Woods sums up his results in the following words :—“ Results
on the same day are almost, if not quite, alike both with the disk and
without. The corona varies more or less from day to day. The
clearer the day the better the results.”’*

During the last two years the sky in this country has been too
bright from scattered light to make it possible to obtain successful
photographs of the corona.+

We have now to discuss the probable nature of the corona.t

The drawings, but especially the photographs, of the solar eclipses
of the last twenty-five years show that notwithstanding great changes
in form and in brightness, the corona is permanent in its more funda-
mental characters. The observed changes in form, in brightness, and
in relative extension, are obviously due to secondary modifications of
the conditions to which the corona owes its existence.

The circular form which was ascribed to the corona in the older
observations can scarcely be regarded—even in the roughest sense of
the word—as correct. On the contrary, the apparent form of the corona
is always very irregular, in consequence of the greater extension and the
creater relative brightness of certain parts. Upon the whole, there is

* “The Observatory,’ December, 1884, p. 378.

t+ It may not be unnecessary to state that what the photographer has to seize
upon on his plates is the small excess of photographic power of the air-glare in-
creased by the coronal light from behind over that of the air-glare alone. For this
purpose the greatest care is necessary to select the most suitable time of exposure,
and to arrest the slow development of the plate at the proper moment. Unless the
attempt is made at a high elevation, the impression upon the plate must be a very
slight one, and the developed image can only be seen under favourable conditions of
illumination. Great care must be taken that all instrumental effects have been
carefully eliminated. A convenient way of distinguishing effects upon the plate
which are due to the instrument, is to take pictures with the instrument alternately
on the west and on the east side of the meridian.

~ The principal points of the discussion of the nature of the corona which follows
were suggested in a discourse given at the Royal Institution, February 22, 1885,
entitled ‘On the Solar Corona.”

On the Corona of the Sun. 117

an observed tendency of the brighter parts of the corona to assume a
square form in consequence of the greater extension of the coronal
matter at the latitudes between the poles and the equator of the sun—
that is, over the zones of maximum spot-action. The corona is fre-
quently less extended over the poles and over the equatorial regions of
the sun.

A noticeable exception to this state of things occurred in 1878,
when the most remarkable features of the corona were two extended
equatorial rays which could be traced to a distance of several solar
diameters. We shall have to consider, further on, some circumstances
which may have had a large influence in bringing about this state of
the corona.

In addition to these large changes in the externa] form of the corona,
there is a complex structure within it which appears to be in con-
tinual change. This inner structure was observed by Professor 8. P.
Langley in 1878, under very favourable conditions, with a telescope of
© inches aperture and a power of 50.

He sums up his observations in the following words :—*
Hixtraordinary sharpness of filamentary structure.

Arrangement not radial, or only so in the rudest sense.
Generally curved, not straight lines.

Curved in different directions.

. Very bright close to the edge, fading out rapidly, fading out
Belly (this part of corona) at 5’ to 10’ from it.

In addition to this more minute structure, there are large bright
portions, apparently streaming outwards, and often leaving between
them less bright spaces, which have the appearance of rifts. There
are also curved forms which seem to turn round and to return to the
sun.

We must not forget that the corona has thickness as well as exten-
sion, and that the forms seen by us must appear more or less modified
by projection. Rays inclined towards or from the observer would be
materially altered in respect of their apparent position on the sun, and
Iong rays in the nearer or more distant part of the corona would appear
to start from parts of the sun other than those to which they really
belong. For the same reason the increase of intrinsic brightness of the
corona towards the sun’s limb must be much less than the increase of
brightness as seen by us, of which no inconsiderable part must be due
to the greater extent of the corona in the line of sight as the sun is
approached. Besides the real changes in the corona which have been
observed at different eclipses, there are several sources of apparent
change which may have modified the photographs taken of the corona.
Of these may be mentioned—the state of the air at the time; the kind
of sensitive surface employed; the length of exposure; whether

_* Report T. 8. Eclipse, 1878, Washington, p. 209.

Coe oN

118 Dr. W. Huggins.

the image has been formed by a lens which shortens and enfeebles
the ultra-violet part of the light, or by a mirror which furnishes an
image more truly representing the corona in the nature of the light
existing init. The difficulties which seemed to lie in the way of a
satisfactory explanation of the forms and of the enormous extent of
the corona, caused some doubts to be entertained as to the corona
being a true solar appendage, and various views were formerly put
forward. to endeavour to explain the corona as an optical appearance
only, arising from our atmosphere, from a lunar atmosphere, or from
cosmical dust. Mr; De la Rue,in his address before Section A of the
British Association in 1872, says truly, ‘The great problem of the
solar origin of that portion of the corona which extends more than a
million of miles beyond the body of the sun, has been, by the photo-
graphic observations of Colonel Tennant and Lord Lindsay in 1871,
finally set at rest, after having been the subject of a great amount of
discussion for many years.’’* :

These earlier views are too completely a part of the history of the
subject to need mention here, but for the circumstance that Professor
Hastings has recently revived the theory of Delisle, that the corona is
an optical appearance due to diffraction. ,

Professor Hastings bases his. theory upon the behaviour of the
bright line, 1474, which he saw, in his spectroscope, change in length
east and west of the sun during the progress of the eclipse at Caro-
line Island in 1883. He assumes, in his explanation of this observa-
tion, that Fresnel’s theory of diffraction. may not apply in the case of
a solar eclipse, and he suggests that at different moments the phases
of the light waves may change so that they no longer form a con-
tinuous periodic series, and that it is possible, at such great distances,
that the interior of the shadow may not be entirely dark, and that
sufficient light may come inside to give to-an observer on the earth
the appearance of a bright aureole around the moon.f

Professor Hastings considers the simpler explanation of his obser-
vation which has been suggested, that the change in length of the
line which he observed might be due to a scattering by our air of the
light from the brighter part of the corona, and, therefore, might not
indicate any change in the corona itself during the progress of the
eclipse, to be untenable, on the ground that the air;was_too clear, and
“diffusion absolutely insensible.” He supports this strong state-
ment by saying that the photographs taken by the English and by the
French observers showed a sensibly black mvon, and that “‘in the
photograph of the coronal lines, H and K, taken by the English
observers these lines ended abruptly at the moon’s edge.”’t

* Report B. A. Advance. Science, 1872, p. 6.
+ Report of Expedition to Caroline Island, 1883, Washington, p. 105.
t Idem, p. 107.

On the Corona of the Sun. 119

Captain Abney, F.R.S., who has the photographs taken. at Caroline
Island under examination, informs me that :—

“The diffusion during that eclipse was not insensible, as the lines
H and K are: distinctly visible across the black moon as dark lines.
It is true that Hand K,.as bright lines, do stop at the moon's limb,
but these lines are not coronal lines, as they belong to the pro-
minences. In the Hgyptian eclipse—which was avery short one—
the prominences were far over the moon’s limb, and the diffusion
due to the atmosphere was such that the lines H and K were shown as
bright lines over the moon. In the Caroline Island eclipse the pro-
minences were much less marked and more hidden during the eclipse
than was the case in Egypt, and it appears that the diffusion by the
air must have been much greater in the former (Caroline Island)
than in the latter, since it is the light from the hidden sun which was
evidently reflected and re-reflected. On one side of the moon’s limb
H and. K are seen reversed, whilst on the other they are reversed
beyond the bright lines..

‘“‘In both cases the reversals are rather faint, but as strong as the
reversal which was seen on the corona spectrum at the Hgyptian
eclipse. In my opinion, in the photographs of the corona with the
longest exposure (I am not now speaking of spectrum photographs)
the moon is not shown as perfectly black, but I should not like to
found any theory very definite as to this, as it might be due to
over-development, but | think not.”

It should. be mentioned that during the time that Professor Hastings
observed the change in length of the line 1474, photographs of the
corona were taken by M. Janssen, and by Messrs.. Lawrance and
Woods. M. Janssen says: “ Les formes de la couronne ont été abso-
lument fixes pendazit toute la durée de la totalité.”* The photographs
taken by Messrs. Lawrance and Woods show that the corona suffered
no such alterations in width and form as would be required by Pro-
fessor Hastings’ theory, during the passage of the moon across the sun.

For other points raised by Professor Hastings, and for his discussion
of former spectrum observations of the corona, I must refer to his

-memoir.t

The evidence in favour of the corona being a true solar appendage
appears to me to be of overwhelming weight. It seems difficult on
any other hypothesis to explain satisfactorily—(1) the observed and
the photographed spectra of different parts of the corona; (2) the
visibility of the planets Venus and Mercury as dark bodies when near
the sun; (3) the filamentous, and especially the peculiar curved
structures seen in photographs of the corona; (4) the close agreement
of photographs taken at different times during an eclipse, and

* “ Annuaire pour l’An 1884,” p. 859.
+ Vide ante.

120 Dr. W. Huggins.

especially between photographs taken during the same eclipse at
places many hundreds of miles apart.

At the same time a very small part of the light which is seen
about the eclipsed sun must be due to diffusion by our atmo-
sphere of the coronal light itself, especially of the very bright part
near the sun’s limb; and we have an indication of the amount of this
diffused light from the apparent illumination of the dark moon,
where the effects of diffusion will be most strongly present. During
some eclipses the part of the sky where the sun and moon are may
be faintly illuminated by light reflected from those regions of the
atmosphere near the horizon which are still in direct sunlight.

It may be well to mention the principal hypotheses which have
been suggested in explanation of the corona.

1. That the corona consists of a gaseous atmosphere resting upon
the sun’s surface and carried round with it.

2. That the corona is made up wholly or in part of gaseous and
finely divided matter which has been ejected from the sun, or received
by it, and which is in motion about the sun from the forces of ejection,
of the sun’s rotation, and of gravity, and possibly of a repulsion of
some kind.

3. That the corona resembles the ring of Saturn, and consists of
swarms of meteoric particles revolving with sufficient velocity to pre-
vent their falling into the sun.

4. That the corona is the appearance presented to us by the un-
ceasing falling into the sun of meteoric matter and of the débris of the
tails of comets.

5. That the coronal rays and streamers are, at least in part,
meteoric streams strongly illuminated by their near approach to the
sun, neither revolving about nor falling into the sun, but permanent
in position and varying only in richness of meteoric matter, which
are parts of eccentric comet orbits. This view has been supported on
the ground that there must be such streams crowding richly together
in the sun’s neighbourhood.

6. The view of the corona suggested by Sir William Siemens in
his solar theory.*

The sun must be surrounded by a true gaseous atmosphere of
relatively limited extent, but there are several considerations which
forbid us to think of a solar atmosphere, in the proper sense of the
term, that is of a continuous mass of gas held up by its own elasti-

* Since this lecture was read my attention has been called to the papers by Pro-
fessor O. Reynolds, ‘‘On the Tails of Comets, the Solar Corona, and the Aurora
considered as Electric Phenomena,” and “On an Electrical Corona resembling the
Solar Corona,” in vol. v, 3rd Ser., “ Lit. and Phil. Soc.,” Manchester, pp. 44-56, and
pp- 202-209. Professor Reynolds considers the solar corona to be a species of that
action known as the electric brush, and to be well represented by discharging elec-
tricity from a brass ball in a partially exhausted receiver.

On the Corona of the Sun. 121

city, which rises to a height sufficient to afford an explanation of the
corona which streams several hundred thousand miles above the
photosphere.

Gravitation on the sun is about twenty-seven times as great as on
the earth, and an atmosphere extending to a moderate coronal height,

even if it consisted of a gas thousands of times lighter than hydrogen,

would have more than metallic density at the sun’s surface, a state of
things which spectroscopic and other observations show cannot be the
case.

There is another consideration from the rapid increase of density
which would take place sunwards in such an atmosphere. Hach
stratum would be compressed by the weight of all the strata above it,
and therefore in descending by equal steps the density of the atmo-
sphere would increase in geometrical ratio. Professor Newcomb gives
as an example an atmosphere of hydrogen; such a gas, though heated
to as high a temperature as is likely to exist at a height of a hundred
thousand miles above the sun, would double its density every five or
ten miles.* There is no approach to so regular and so rapid an in-
crease of density to be observed in the corona.

Another circumstance which puts a continuous gaseous atmosphere
out of question is the fact that comets have passed unscathed through
the coronal regions. Shooting stars passing with the relatively small
velocity of thirty or forty miles per second through our atmosphere,
rarefied as it is, at the height of fifty or sixty miles, are instantly burnt
up. Resistance and heat increase as the square [or more probably for
such high velocities as the cubey | of the velocity, yet the nucleus of a
comet has passed through several hundred thousand miles of coronal
matter with a velocity of 300 miles per second without suffering any
sensible loss of velocity. These considerations are amply sufficient to
show that the theory of a solar atmosphere of gas of the extent of the
corona held up by its own elasticity cannot be entertained.

As we have reason to believe that the corona is an objective reality
about the sun, matter of some sort must exist wherever the corona
is seen to extend. The questions before us are—(1.) In what form
does the matter exist? (2.) Whence does it come? (3.) What are
the dynamical conditions under which it can exist at such great
heights above the sun P

(1.) On the first of these questions as to the condition of the
matter, the spectroscope has given us definite information.

The spectrum of the corona is compound, and consists of three
superposed spectra. :

(a.) A bright continuous spectrum, which informs us that it comes
from incandescent solid or liquid matter.

* “Popular Astronomy,” p. 259. + See Bashforth, ‘ Phil. Trans.,” vol. 158,
p. 417.

122 Dr. W. Huggins.

(b.) A solar spectrum, which shows that the incandescent solid or
liquid matter of the corona reflects to us. light from the photosphere.

(c.) A spectrum of bright lines, which is relatively faint and varies
greatly at different eclipses. We shall. consider this. spectrum more
particularly further on; it is sufficient at this part of the argument
that we speak of this spectrum so far only as it tells us of gaseous
matter which accompanies the solid or liquid matter..

It is scarcely necessary to.say that solid. or liquid matter can exist
in the corona only in the form of discrete particles of extreme
minuteness.

The corona must, therefore, consist of a fog, in which the particles
are incandescent, and in which the gaseous matter dees not form a
continuous atmosphere. Some of the considerations we have already
had before us, make it evident that this coronal fog,.except very near
the sun, must be of a degree-of tenuity surpassing any experience we
possess from terrestrial experiments. In order to give some definite-
ness to our conceptions, let us. suppose a. single: minute liquid or:solid
particle in each cubic mile. A fog even so extremely attenuated, or
even much more so, would probably be fully sufficient to give rise to
the corona, under the enormous radiation to which it is.subjected..

(2.). The next question we have to consider is whether the matter
of the corona is of solar origin, or whether it comes upon the sun
from without..

Two external sources of the coronal matter have been suggested,
and are widely held, namely :—(a) meteroids, and (6) the lost matter
of the tails of comets.

(a.) The solar system is- crowded with meteoroids: revolving in all
kinds. of erratic orbits, and we know that the earth encounters many
thousands of them every hour, but the sun is in a different position
with regard to such of these bodies as belong to our system. In
order to fall into the sun,. the planetary meteoroids: would have to be
thrown into it, through some disturbance of their orbits, produced by
planetary attraction, or by collision with ‘other streams, unless we
admit a slow retardation of velocity produced by a resisting
medium..

There may; be meteoroids which fall directly into the sun from
space. Mr. Denning’s recent observations seem to show that the
solar system encounters. meteor streams which: may be moving with
ereat velocity through space.*

Many of these bodies may fall into the sun, but we have no know-
ledge of conditions which would ensure so steady an inflow of
meteoroids as: would be needed to maintain the observed extent of
the corona im a state of permanence about the sun.

(b.) The other suggestion which: has: been made regards the corona

* “Month. Not. R. Ast. 8.,” vol. xlv, p. 93: See also subsequent papers.

53h

On the Corona of the Sun. 123

as fed by the lost matter of the tails of comets. We must remember
that the matter which comes from the nucleus of a comet, and forms
its tail, and is then lost, has been shown by the spectroscope to con-
sist in nearly all. comets, of carbon, hydrogen, nitrogen, and possibly
oxygen.* If this matter is condensed into the discrete particles
which form the tail, in the same conditions of chemical combination
as it existed originally in the nucleus, we should expect these particles
to be again vaporised in their near approach to the sun; and under
these conditions we should expect to find the corona to be mainly
gaseous, and to give a spectrum similar to that which is produced by
the emitted hght of comets. We know that such is not the case;
there is, however, a.single observation by Tacchini at Caroline Island,
in which in one part of the corona he suspected two of the bands which
are.present in the ordinary cometary spectrum. His words are :—
*“‘ Dans le spectre du grand panache, qui était faible et presque con-
tinu, et que lon. voyait seulement a fente large, j’ai observé deux
bandes.qui m’ont semblé étre analogues a celles que j’ai observées
dans les spectres de cométes, c’est-a-dire, la centrale et la moins
réfrangible.”+ The terms in which this unique observation is given
show that the lines, even if truly present, were faint and exceptional,
and cannot be regarded as characteristic of the coronal light.

It may indeed be suggested that the cometary matter suffers decom-
position at the time when it becomes luminous near the nucleus, and
that carbon may be separated in a finely divided state, and go to
form part of the lost matter of the tail. In the case of comets: which
have more than one tail, or exhibit rays driven off with a curvature
different from that of the principal tail, there is good. reason to
believe, as. Bredichin has endeavoured to show,{ that each tail or
caudal ray consists of matter different in density, which has been
separated. by a force of repulsion varying as the surface. It would
appear doubtful, even on this view, if the supply of comets’ tails is
sufficiently regular in amount to maintain a permanent corona about
the sun. |

It seems. to me to be much more probable that the corona is fed
from the sun itself. This view is supported by the spectroscopic
evidence, for the coronal gas is shown to consist of substances which
exist also in the photosphere. The structure seen in the eorona is
much more in harmony with the view that the matter is going up
from the sun, than that itis coming down. upon the sun..

An examination of the photographs taken at eclipses, or of Mr.
Wesley’s admirable drawings from them, can scarcely fail to: lead an
unbiased student to the same conclusion as that which was forced

* “Phil. Trans.,”” 1868, p: 559, and “ Proc. Roy. Soc.,”’ vol. xxxiii, p. 1.
+ “ Annuaire pour l’An 1884,” p. 862.
ft “Annales de l’Observatoire de Moscou,” and “ Astron. Nachr.,” No. 2411.

124 Dr. W. Huggins.

upon Mr. Lewis Swift when he observed the corona of 1878 :—“‘T
was irresistibly led to the conclusion that the corona, whatever may
be its nature, is not a solar atmosphere, nor an inflow of meteoric
matter, as many suppose, but rather an outflow of something.’’*
These considerations appear to me to be of great weight in support of
the view, that though some meteoroid and some cometary matter may
fall into the sun, the corona consists essentially of matter coming
from the sun.

(5.) We have now to consider under what dynamical conditions
matter coming from the sun can take on forms such as those we see
in the corona, and can pass away to such enormous distances, in
opposition to gravitation, which is so powerful at the sun.

There is another celestial phenomenon, very unlike the corona at
first sight, which may furnish us with a clue to the true answer to
this question. The head of a large comet presents us with luminous
streamers and rifts and curved rays, which are not yery unlike on a
small scale some of the appearances which are always present in and
are pecular to the corona. We do not know for certain the con-
ditions under which these cometary phenomena take place, but the
only theory upon which they can be satisfactorily explained, and
which now seems on the way to become generally accepted, attributes
them to electrical disturbances, and especially to a repulsive force
acting from the sun, probably electrical, which varies as the surface,
and not like gravity, as the mass.t A force of this nature in the case
of highly attenuated matter can easily master the force of gravity,
and as we see in the tails of comets, blow away this thin kind of
matter to enormous distances in the very teeth of gravity.

If such a force of repulsion, acting from the sun, is experienced by
comets, it must also be present near the sun, and may well be expected
to show its power over the matter ejected from the sun’s surface.

* Report Total Solar Eclipses of 1878 and 1880, Washington, p. 231.

+ “Proc. Roy. Inst.,”’ vol. x, p. 9; also Bredichin, “ Annales de l Observatoire de
Moscou,” vol. v, No. 2, p. 89; ‘‘ Astr. Nachr.,” No. 2411; and papers by Faye in .
the ‘Comptes Rendus.’”’ Stokes, “On Light as a Means of Investigation,” p. 70,
et seq. O. Reynolds, “On Cometary Phenomena,” “ Mem. Lit. and Phil. Soce.,”
Manchester, vol. v, p. 192.

{ As a contribution to the history of opinions involving more or less distinctly
the idea of repulsion, it may be well to give the followimg words by Professor Young
(Amer. J. of Science,” vol. i, May, 1871, p. 7) :—‘‘ On the one hand, that of Pro-
fessor Norton and Mr. Proctor, whose views regarding these rays (the Jong faint
rays) are nearly identical, and represent them to be streams of matter, similar to
cometary substance or auroral.” In a foot-note Professor Young says further :—
‘“‘Since my name has sometimes been referred to in connexion with the so-called
‘Auroral Theory of the Corona,’ it is proper for me to state that I make no claim
to be its originator. So far as I know, Professor Norton was the first to work out
and publish a connected theory of the subject, basing his conclusions largely upon

On the Corona of the Sun. 125

The existence of a force, which, under suitable conditions, may
become one of repulsion at the sun’s surface, is not hypothetical only,
for we have reasons to believe that such a force must really be present
there. Though we have no definite knowledge of the distribution of
electricity on the surface of the sun, we do know that chemical and
mechanical actions are taking place there which must be accompanied
by electrical disturbances. It seems to me that these disturbances,
which must be of a high order of magnitude, bring about the magnetic
changes on the earth which are observed to take place in connexion
with solar phenomena.*

The grandest displays of terrestrial electrical disturbance must be
altogether insignificant in comparison with the electrical changes
which must accompany the ceaseless and fearful activity of the
photosphere. Not to mention the frequent outbursts of heated gas
thousands of miles high, and over areas in which the earth could be
engulphed, there is the unceasing formation of the fiery photospheric
cloud-granules about as large as Great Britain. Surely it is not too
much to say that our terrestrial experience of lhghtning and of

his discussions of Donati’s comet, which were printed in this Journal some years
ago. Professor Winlock also informs me that he has held and published a very
similar opinion, and so I think have more than one of the European astronomers.
My own father, more than twenty years ago, was accustomed to teach from the same
chair of astronomy which I now occupy, an essentially similar doctrine. Thus the
idea had long been familiar to me, and, I presume, more or less so to astronomers
generally.”

It may be well to give a more direct reference to the papers of Professor W. A.

Norton. He says, speaking of comets (“ Proc. Amer. ‘Ass.,”’ 1854, P- 166) :—“ The
tails of comets flowing away under a repuisive force from the sun.’
** | this pomuleive force | to consist of the impulsive action of auroral matter Aowine
from the sun.” Again, speaking of the corona, he says: “The ges ettes of auroral
matter flowing off chiefly from the polar regions into space.’ In a subsequent
paper (‘“‘ Proc. Amer. Ass.,” 1859, p. 167) Professor Norton defines his idea of the
repulsive force as “‘a Borers force of cosmical repulsion exerted by all cosmical
masses.”

Mr. Proctor’s views will be found in his work, “The Sun, the Ruler of the
Planetary System,” 3rd Hd., 1885, pp. 326—427.

For M. Faye’s views on a repulsive force, see “ Annuaire pour l’An 1883,” also
“Annuaire pour |’ An 1885,’ and numerous papers in the “Comptes Rendus.”’
Reference should also be made to the conjectures on the existence of a repulsive
force thrown out by Sir John Herschel in his Cape Observations.

* Professor Stokes and Professor Balfour Stewart have both speculated on the
connexion between solar disturbances and terrestrial magnetism, and have both
imagined that the operative solar change is thermic—not electrical, and that it is
through radiation that it affects the condition of the earth in such a manner as to
be manifested by magnetic disturbances, though the modes in which these philoso-
phers have conjectured that this takes place are wholly different. In a subsequent
note L have suggested that the operative solar change is electrical, and that the
action is probably one of statical induction.—August 20, 1885.

126 Dr. W. Huggins.

aurore fail to supply us with any adequate basis for a true concep.
tion of the electric forces in action on the sun.

The phenomena of comets show not merely a highly electrical con-
dition of the sun’s surface, but also the permanence of an electric
potential of the same kind, whether negative or positive.* Though
we do not know enough of what is taking place at the sun to define
the conditions which may cause the matter ejected from the sun’s
surface to have a high electric potential of the same name, yet we
can see that broadly all the different actions which take place there,
and to which the electric disturbances are probably due, are parts
of one continuous process going on always in the same direction,
namely, the transference of energy from the interior to the photo-
sphere, and the loss of the energy there, in the radiant form.

We must bear in mind that a strongly electrified state ef the solar
surface would not act as a force of repulsion upon discrete particles
of matter insulated from each other, such as exist in the tails of.
comets and in the corona, unless these particles possessed an electric
potential of the same kind as the solar surface. If these particles
were in an unelectrified condition, the action of the sun would be one
of statical induction only, altering the original distribution of elec-
tricity over their surfaces, but powerless to change in any sensible
manner the positions of ther centres of gravity in space, because
the attraction on one side of each particle would be balanced by the
repulsion on the other.

* The sun’s potential may be regarded as due to actions of some kind always going
on, or to a permanent charge received at some past’time. ‘The sun if once charged
with electricity of the same name would doubtless remain so charged, as Mr. Crookes’
experiments appear to show that a vacuum would be a perfect insulator.

If the sun has been charged with electricity of one name, we do not know how this
came about, though more than one probable conjecture might be hazarded. Some facts
mentioned further on as to the influence of Mercury and of Venus upon the coronal
matter would seem to make it very probable that these planets are permanently
charged with electricity of the other name to that of the sun. If this should hold
good also of the more distant planets (we know nothing of the absolute potential of
the earth’s surface), we should have the planets charged with one kind of electricity,
and the sun charged with the opposite electricity. As we have reason to believe
that the sun and the planets formed originally one cosmical mass, the question may
be suggested whether these changes of electricity of opposite names can have been
brought about in connexion with the separation of the matter which forms the
planets from that which exists in the sun.

If we regard the sun as possessing an electric potential of one name, it is not
absolutely necessary to suppose the local electric disturbances which are spoken of
in the text. Electric disturbances are undoubtedly taking place there, and through
these the ejected matter might come to have a higher potential than it possessed as
forming part of the sun. Through these locai disturbances some of the matter of
the corona might have sometimes a higher or lower potential of the same name,
and in this way might arise one of the varying conditions upon which the observed
changes in the corona depend.—August 20, 1883.

te

On the Corona of the Sun. 127

If we grant the existence of a high electric potential of the sun’s
surface, we become possessed of a means of explanation of the chief
coronal phenomena, provided we accept the conclusion to which our
arguments have already led us, that the matter of the corona is of
solar origin.

The photosphere is the seat of ceaseless convulsions and outbursts
of fiery matter. Storms of heated gas and incandescent hail rush
upwards, or in cylones, as many miles in a second as our hurricanes
move inan hour. Dante’s and Milton’s poetic imaginings of Hades
fall far below the common-place scenes at the solar surface. Is it then
going beyond what might well be, to suppose that some portions of the
photospheric matter, having an electric potential of the same kind as
that of the solar surface, from which they come, and ejected, as is
often the case, with velocities not far removed from that which would
be necessary to set them free from the sun’s attraction, should come
under the action of a powerful electric repulsion, and so be carried
upwards, and from the sun? |

If we take this view of things, we are able to accept the objective
reality of many of the very long coronal rays, which seem‘to rest upon
sufficient testimony. At the eclipse of 1878, Professor Langley traced
the coronal matter to a distance of twelve solar diameters, and he
adds: ‘‘I feel great confidence in saying that (this distance) was but
a portion of its extent.”* Professor Newcomb traced this ray to
about the same distance, “six degrees from the disk.”*+ Such dis-
tances are small as compared with the extent of the tails of comets.

This view of the corona is in harmony with the source of the
matter, and of the forces which the structure of the corona almost
uresistibly suggests, namely, that these have their seat in the sun.
We should expect, what we find to be the case, that there is usually
ereat coronal richness and extension over the spot zones where the
solar activity is most fervent. Matter blown upwards by an electrical
repulsion would rise with the smaller rotational velocity of the photo-
sphere from which it started, and would appear to lag behind in its
ascent, and so give rise to the curved rays, which are so common a
feature. We may well suppose that the forces of eruption and of
subsequent electrical repulsion would vary in different places, and
not be always strictly radial; under such circumstances a structure,
similar to that which the corona presents, might arise. A force of
repulsion would also be present among the similarly electrified particles
of the corona, acting in all directions, and would cause these particles
to separate from each other, during their ascent from the sun; the
amount of this diffusion would depend upon several factors, among
others, upon the original velocity of ascent, and upon the density
and the degree of electric potential of the repelled stuff.

* Report Total Eclipse, 1878, Washington, p. 208. + Idem, p. 104.

4‘ * Mea a

A relatively very small amount of matter, under this diffusing
force, would suffice to give rise to the corona, and we can see how
the extremely attenuated state of the corona, consisting as it must
do, of minute particles widely separated, it may be by miles each
from the other, may have been rapidly brought about.

It is now time to consider the gaseous matter which we know to be
associated with the coronal particles, but not to form a continuous
gaseous atmosphere. The gas which exists with the incandescent
particles, and which the spectroscope shows to have come from the
photosphere, may have been carried up as gas, or have been in part
distilled from the condensed matter which forms the coronal par-
ticles, under the enormous radiation to which they are exposed.
Such a view of the gas which is present in the corona, would not
be out of harmony with the circumstance that the amount of gas
relatively to the incandescent particles appears to vary (at the last
eclipse in Caroline Island it seems to have been but very sparingly
present), nor with the very different heights to which different
bright lines may be traced at different parts of the corona and at
different eclipses. Gases of different vapour-density would be
acted upon differently by an electric force of repulsion which varies
as the surface, and would to some extent be winnowed from each
other; the lighter the gas, the more completely would it come under
the sway of repulsion, and so would be carried more rapidly to a
ereater height than a gas more strongly held down by gravity.
The relative proportions, as well as the actual amounts, at different
heights in the corona, of the gases which the spectroscope shows to
exist there, would vary from time to time; they would depend in fact
also on the largeness of supply from below, in other words, upon the
state of activity of the photosphere, and in this way there would
come about a relation probably between the corona and the promi-
nences.

The varying amount of gas in different parts of the corona is illus-
trated by the following statement in the Report on the Eclipse of
1882, by Captain Abney and Professor Schuster :—

“The ring in the green (1474) is particularly strong in the south-
western quadrant, and hardly visible at some other points of the sun’s
limb. The yellow ring (D,) is much fainter on the whole, but more
uniform all round the sun.”

Further on (p. 270) they say—‘ As regards the corona, we may
perhaps point out that hitherto the position of only one true coronal
line had been fixed, though two other lines had been suspected. The
corona during the late eclipse seems to have been especially rich in
lines. Thollon observed some in the violet without being able to fix
their position, and Tacchini could determine the position of four true
corona lines in the red; from the photograph we have been able to

128 Dr. W. Huggins.

On the Corona of the Sun. 129

measure about thirty additional lines, thus increasing the number of
lines considerably.’’*

Captain Abney informs me as follows : “The spectrum of the corona
had fewer lines in the Caroline Island eclipse (1883) than in the
Hgyptian eclipse (1882), and the corona was much brighter at one limb
than at the other in 1883. JI think I can trace reversed Fraunhofer
lines beyond the bright lines H and K away from the moon’s edge.”

It would seem probable that at the time of the eclipse of 1883, the
amount of light-emitting gas was smaller relatively to the number
of incandescent particles than at the time of the eclipse of the pre-
vious year. This supposition agrees with the fact that the scattered
solar light, showing the Fraunhofer lines, was strong in 1883.

There may be another connexion between the corona and the pro-
minences besides that of a supply of gaseous matter, namely, one due
to an increase of electric potential of the ejected matter when the
prominences are numerous and large.

The electric disturbances which accompany the formation of large
sun-spots are well known to be of sufficient magnitude to be felt upon
the earth, by causing changes in the distribution of the terrestrial
magnetism sufficiently great to affect our instruments.t The Astro-

* “Phil. Trans.,” 1884, pp. 264 and 270.

+ We do not know the mode in which the sun acts upon our magnets. The solar
action may be a direct one due to changes in the sun’s magnetism, or to an electro-
magnetic action due to electric currents, or to electrified matter in motion with a
high velocity. The views suggested in this lecture of tne sun’s electrified state, and
of the nature of the corona may possibly throw some light on this point. Two
distinct modes of the sun’s action on the magnetic needle seem to be possible :—

_(a.) The sun being a charged conductor separated from the earth, also a conductor,
by an insulating vacuum, would affect the distribution of the earth’s electricity
by its power of statical induction. As the earth rotates currents would be set up
about it to effect the redistribution of electricity required to satisfy the inducing
influence of the sun. May we not find in these earth-currents an explanation
of some of the phenomena of the earth’s magnetism? However this may be,
the changes in the sun’s statical induction which would follow from the shooting
forth of the electrified matter of the corona, may well so affect the earth-currents
as through them to bring about the disturbances observed in the needle. The
electrified matter of the corona which leaves the sun will still go on, even when too
diffused to be visible, and will still continue to produce upon the earth the effect
due to its charge of electricity. The amount of this action will depend greatly upon
the direction of the projected matter relatively to the position of the earth.

(o.) The other possible mode of action of the corona would be to suppose an
electromagnetic action upon the earth. The electrified coronal matter moving with
a high velocity would act similarly in this respect to electric currents. Among other
difficulties we must consider the rapid decrease of electromagnetic action at a
distance.

If the sun is a charged body, then in consequence of continually parting with
matter charged with electricity of the same name as that of the sun’s charge, the
sun’s potential would be slowly decreasing. This consideration would be in support,

VOL. XXXIX. - K

130 Dr. W. Huggins.

nomer Royal, writing of the magnetic activity of the year 1882, says :
‘The month of November, which was characterised by the appearance
of a very large sun-spot, being particularly disturbed with remarkable
rnagnetic storms on November 17, 19, and 20, and many interesting
cases of lesser disturbance.”*

We can scarcely doubt but that similar electric disturbances of
exceptional magnitude accompany the formation of the prominences ;
indeed these phenomena may themselves be, in part at least, electric
discharges analogous to terrestrial aurore.f However this may he,
we can scarcely doubt that large electric disturbances accompany
them. Tacchini takes the view that electricity plays a chief part
in the prominences, and believes that he is able to show a connexion be-
tween these phenomena and corresponding changes in the magnetism
of our globe.f

Hitherto in our discussion of the forces which may be active in bite

corona, we have taken account only of the influence of electrical —

changes which take place wpon the sun. Now these changes at the
sun make themselves felt upon the earth ; we may then well suppose,
with a high degree of probability, that the earth,$ and especially the

of the conjecture thrown out in the last sentences of the text, that the corona was
formerly of larger extent, and that it will continue to diminish.—August 20, 1885.

[My attention has been called this day to a paper by Prof. O. Reynolds, “ On the
Electro-dynamic Effect which the Induction of Statical Electricity causes in a
Moving Body. This Induction on the part of the Sun a probable Cause of
Terrestrial Magnetism.” ‘‘Mem. Lit. and Phil. Soc.,’” Manchester, vol. y, 3rd Ser.,
p. 209.—Sept. 29, 1885. |

* Report of the Astronomer Royal, 1883, p. 13.

+ See Balfour Stewart, “ Proc. Roy. Inst.,” vol. iv, p. 60.

t “Reale Accademia dei Lincei (March 1, 1885), 8.N., vol. i, p. 181. Tacchini
says :—‘‘ Cid viene anche a corroborare Vopinione mia e di qualche altro, che cioeé
nel fenomeno delle protuberance solari l’elettricité attia una parte rilevante, da
dovere forse considerare non poche di esse come fenomeni puramente ellettrici, come
aurore polari, capaci di indurre sul nostro globo i correspondenti disturbi mag-
neticl; . . . . noi possiano intanto considerare come cosa assicurata alla
scienza, che if fenomeno della maiehie solari, quelle delle protuberanze ed il mag-
netismo terrestro variano cosi di aecordo.”

At the same sitting Professor Respighi took a different view (p. 174) and stated
he did not consider the prominences to be of a nature-to occur in periods, and that
he could not admit a connexion between the maxima and minima of the prominences
and the elements of terrestrial magnetism. At the following sitting, March 15
(p. 228) Tacchini replies to the objections.of Respighi, and endeavours to show that
Respighi has been influenced by his preconceived views of the nature of spots and
prominences. F

§ Mr. Broun, in his discussion of the variations of the earth’s magnetism (“ Proc.
Roy. Soc.,” vol. xxiv, p. 231), says :— It is shown that those changes (in 1844 and
1845) occur at intervals of twenty-six days, or multiples of twenty-six days. . .
As this period is that of the sun’s rotation relatively to the earth, it appears to
follow that the earth has some action on the sun, or (more probably) on some ray-
like emanation from the sun, which causes these changes in the earth’s magnetism.”

On the Corona of the Sun. 131

nearer planets Venus and Mercury, exert an influence on the electri-
fied and attenuated matter of the corona.

The elaborate researches of Mr. De la Rue and Professor Balfour
Stewart appear to show an influence exerted by Venus and Mercury
upon the solar regions of spot action.

We know nothing of the electric distribution on Venus and on
Mercury, but it seems more than probable that these bodies, as well as
the meteor-swarms nearer to the sun, have an influence in determin-
ing the mode of outflow of the electrified coronal matter in the direc-
tions in which they happen to be. ‘The influence may be one of
attraction, giving rise to coronal extension or rays from the corona,
or to repulsion, in which case we might have what appears to us as a
rift directed towards the body.

We have not sufficient data to furnish certain information on this
point, but it may be of interest to quote the following sentences from
Mr. Trouvelot’s Report of the Eclipse of 1878* :—

“‘ There is a fact connected with this eclipse, which, if not due to a
singular coincidence, would seem to point to some attractive action of
the planets on the solar atmosphere (corona). On the day of the
eclipse Mercury and Venus were in almost opposite points of their
orbits, with the sun between and almost on a line with them. while
the Harth on the same day was in a part of its orbit which formed
the apex of an equilateral triangle having for base the line joining
Mercury and Venus. Knowing this, it is perhaps singular, and any-
how very remarkable, to see that the eastern wing of the corona was
directed on a straight line to Mercury, while the western appendage
was directed ona straight line to Venus. The coincidence was still
ereater. As in regard to the sun, the two planets were not exactly
on the same line, Mercury being a little to the north, while Venus
was a little to the south of the ecliptic; the solar appendages have
shown the same peculiarity, their axes being a little inclined to each
other.”

I may say that the inclination of the axes of coronal extensions on
the two sides of the sun may be seen in the photographs of this
eclipse. It should be stated that Professor Newcomb, who observed
the coronal extension towards Venus, says:—‘‘I tried to judge
whether the western one (ray) pointed towards the planet Venus,
then plainly visible near the horizon. The direction was apparently
very slightly below that of the planet.” Professor Newcomb’s words
seem to show that he did not make any allowance for refraction,
which would make the planet when near the horizon appear sensibly
higher than its true place.

If sufficient evidence should be forthcoming in the future to estab-
lish a sensible influence of the planets upon the corona, we should not

* Page 93,
K 2

132 Dr. W. Huggins.

expect to see the coronal matter in all cases moving exactly towards
or from a planet, because this matter would be also under the influ-
ence of a motion in the direction of its I repulsion, and also
of one of rotation about the sun.*

There has been some difference of ope as to whether the corona
is uniform in constitution from the sun’s limb outwards, or whether
it consists of two parts, which have been distinguished by the names,
‘inner corona’ and “‘ outer corona.”

There can be no doubt that at certain times, and in certain solar
latitudes, a lower part of the corona, such as that described by Pro-
fessor Langley, extending from about 5’ to 10’, is so much brighter
than the parts outside of it that it seems to form what may be called
an inner corona. At the same time, the photographs of different
eclipses, and Mr. Wesley’s drawings from some of them, show dis-
tinctly that all the stronger indications of structure can be traced down
almost to the sun’s limb, and that the brighter parts within some
6' to 10’ of the limb, are not equally bright all round the sun. This
brighter ner part is represented very strongly in several drawings
wich accompany Mr. Stone’s paper on the eclipse of 1874, especially
in one by Mr. Wright.t There seems great probability that the corona

* General Tennant, F.R.S., informs me that since this lecture was read, he has
calculated the places of Mercury, Venus, and Mars for the eclipse of 1871 and the
eclipse of 1882. He says :—

“The positions at the eclipse of 1871 are—

Mercury position angle ........ 100° 39’
Venus 43 BA satel, amt i Seae tie
Mars Py scelnteteltity + kOOn Aled

Mercury is thus not far from the direction of the great prominences lettered H and
T (see catalogue at page 27 of my report, ‘ Mem. R. Ast. Soe.,’ vol. xlii), and corre-
sponds to the greatest extension of the coronal matter, namely, 45’ in my table.
Venus is near the group lettered V, W, and X, of which group V is less only to H
and I in height, and corresponds to the next greatest extension of the corona
namely, 34’ 56” in my table. The real heights of the visible extensions, allowing
for the foreshortening, would be for Mercury, 41’ 3” or 45’ 31”, according to the
reading taken ; and for Venus, 47’ 05”. Any such calculation, however, implies a
form of the coronal extension which does not exist. The more foreshortened ray
would, in fact, on account of its breadth, seem longer in proportion than the one
which is seen more nearly perpendicularly to its axial direction; and in this case
this consideration would tend to reduce the real extension of the Venus ray. Mars
does not seem to have any marked ray directed to him, but any such ray would be
much foreshortened if it existed.

“ At the time of the eclipse of May 16, 1882 (‘ Phil. Trans.,’ vol. clxxy, Plate 13),
we should have the effects of the planets Mercury and Venus coincident, and not
much foreshortened, in the coronal pictures. The combined effects of these planets
are shown in the protruding angle at the upper left side of the engraved corona.
There seems a marked protrusion of the general light thereabouts which would be
opposite to the planets.’”—August 15, 1885.

+ “Mem. Roy. Astron. Soc.,” vol. xlii, pp. 43, 51, and 53,

On the Corona of the Sun. 133

is of the same nature throughout, but that there is often so much
more matter, in other words, the coronal fog is so much denser, within
5' to 10! of the limb, that under the effects of projection, and when seen
by the eye or with a very low power, this part of the corona appears
to be marked off from the corona beyond. It is possible that a clue
to the real state of things may be found in the photographs of the corona
of 1878. When these are examined the long equatorial rays seen by
eye, can be traced a little distance beyond the bright corona, but it is
found that the corona, as a whole, is not drawn out at this part, so as
to extend to several solar diameters, but that these great extensions
consist of rays or streamers coming out from the general coronal
mass, something in the way in which fainter rays often extend from
the principal tail of a comet. They may be due to a similar cause,
namely, the electric repulsion acting upon particles which are more
completely under its sway, either from their less specific gravity, or
their more highly electrified condition. The consideration presents
itself, whether in this state of things, we have only an extreme case
of the conditions always present in the corona, which gives rise to the
appearances which have suggested the distinction of an ‘inner
corona ” and an “ outer corona.”’

There is another question which awaits consideration, namely,
whether the corona rotates with the sun. It seems obvious that if the
corona is due to a supply of matter and to forces coming from the sun,
then the coronal structure and the degree of extension, which are pro-
duced by them, at any part of the sun, would continue to be produced
by these agencies at that part of the sun, and in that sense the corona
would rotate. In the case of the more distant and diffused parts, the
rotation could scarcely be of one and the same material object, any
more than in the sweep of a comet’s tail at perihelion, the corona
being constantly renewed and reformed over each part of the solar
surface. If we suppose the corona to come under the influence of an
external force as that of a planet, then we should expect the ray
drawn out towards it, or the rift formed opposite to it, to continue to
be directed to this external object, and to be independent of the solar
rotation. The subpermanence of any great coronal form, therefore,
would probably have to be explained by the maintenance for some
time of the conditions upon which the form depends, and not by an
unaltered identity of the coronal matter; as in the case of a cloud
over a mountain top, or of a flame over the mouth of a volcano.

We have to consider another question : What becomes of the coronal
particles? Are they carried away from the sun, as the matter of the
tails of comets is lost to them; or do they return to the sun?

The results of eye observations, as well as of the taking of photo-
graphs with different exposures, have shown that there is great pro-
bability that the corona has not an outer boundary, but that it is lost

134 On the Corona of the Sun.

in an increasing faintness and diffusion. The absence of a limit is
probably true only of the faint outer parts of the corona. Within,
and especially about the distance from the sun’s. limb to which the
so-called ‘‘inner corona’’ usually extends, there is evidence of an
apparent arrest of coronal matter, due in part probably to the effects
of perspective, and within this distance are seen numerous rays which
turn round and descend towards the sun. These returning curved
forms are well shown in Mr. Wesley’s drawings of the eclipse of 1871.*

We are led to the conclusion that many of the coronal particles
return to the sun, but that in the case of other particles which form
the stronger coronal rays and streamers, there is no return, but that
they leave the sun, and, at the same time, separate more widely from
each other by their mutual repulsion, and become too diffused to be
visible. The state of extreme attenuation of this diffused coronal
matter—such that the nuclei of comets pass through it without
sensible retardation, enables us to see that the corena may be main-
tained at an extremely. small expenditure of solar material. Among
other considerations it may be mentioned that an electric repulsion
can maintain its sway only so long as the repelled particles remain
in the same electrical state; if through electric discharges the parti-
cles cease to maintain the electric potential they possess, there will
be no longer any force of repulsion acting upon them, and gravity
will be no longer mastered. If when this takes place, the particle
is not moving away with a velocity sufficiently great to carry it
from the sun, the particle will return to the sun. Of course, if the
effect of any electric discharges or other local conditions has been
to change the potential of the particle from positive to negative,
or the reverse, as the case may be, then the repulsion would be
changed into an attraction acting in the same direction as gravity. —

This ceaseless outflow of extremely minute particles, very widely
separated from each other, may possibly throw some light on another
phenomenon which has not yet been satisfactorily explained, namely,
the zodiacal light.

The views which I have ventured to put forward in this lecture
would lead us to expect that a more extended and more brilliant
corona surrounded the sun in early geological time, and that if the
skies were then of their present degree of clearness, the corona would
probably have been visible about the sun.

May the corona have been still faintly visible in the earliest ages of
the human race? Are there any philological traces of it in the
earliest words and ideas connected with the sun ?

On those eastern plains, where the air is of so great purity, did
early men still see faintly a true zapyuos P

Similar considerations point to a slow secular diminution in extension

* “Mem. Roy. Astron. Soc.,” vol. xli, Plates 6, 7, 8, and 10.

_ Harmonic Analysis of Tidal Observations. 135

and in brightness of the corona, as the sun slowly loses heat, and the
actions of the photosphere become less fervent.

The candle of the sun is burning down, and so far as we can see,
must at last reach the socket. Then will begin a total eclipse which

will have no end:
“ Dies illa
Solvet seclum in favilla.”’

“Results of the Harmonic Analysis of Tidal Observations.”
By A. W. Bairp, Major R.E., and G. H. Darwin, F.R.S.,
Fellow of Trinity College and Plumian Professor in the
University of Cambridge. Received March 19, 1885.

The harmonic analysis of coutinuous tidal records, inaugurated by
a Committee of the British Association m 1868, has now been
carried out at a considerable number of ports. Some of the earlier
results were collected together in the Reports to the Association in
1872 and 1876, and ina paper-by Sir W. Thomson and Captain Evans,
read before the Association in 1878, but the largest mass of data is
contained in the tide tables now being annually published for the
Indian ports under the authority of Her Majesty’s Secretary of State
for India. | |

The Report of the last Committee ef the British Association, pub-
lished in the volume for the meeting at Southport in 1883, is entirely
theoretical, and has been adopted in India as a manual of the method
of harmonic analysis.: It is there shown how the results of the analysis
are to be presented in a form appropriate either for theoretical treat-
ment or for mechanical prediction by the instrument of the Indian
Government in London. It is also shown how the scattered results,
referred to above, may be reduced to the form which has been
adopted asastandard. Major Baird has collected the whole of the
Indian results, and those contained in the Reports of 1872 and 1876,
and, by the aid of his staff of computers at Poona, has reduced them
to this standard form. The greater part of the annexed tables is
the result of this work.

We must refer to the Report to the British Association for 1883 for
an explanation of the method of harmonic analysis, but it will be
well to give a few words of explanation.

Each one of the tides, into which the oscillation of sea-level is re-
garded as analysed, is expressed in the form—

fHeos(V+u—x«).
V+u—« is the argument of the tide, and increases uniformly with

the time, so that this term represents a simple harmonic oscillation of
the sea-level with semi-range fH. |

136 Major A. W. Baird and Prof. G. H. Darwin.

It is supposed that w stands for the mean value, estimated over the
year or period of observation, of a certain known function of the
longitude of the moon’s nodes, or in a few cases of the sun’s perigee ;
f stands for a factor of angmentation or diminution of the range of
tide due to the variability of the obliquity of the equator to the lunar
orbit, and a mean value for f estimated over the year or period of ob-
servation is adopted. Tables for computing w and f for each tide are
given in the Report.*

V is a known linear function of the local mean time, of the mean
longitudes of the sun, of the moon, and of the lunar perigee, and it
increases uniformly with the time; the rate of its increase, measured
say in degrees per mean solar hour, is called the speed of the tide.

The numerical operation of harmonic analysis gives us H and x,
which are constants peculiar to the port of observation. As the tide
tables are principally for the use of British sailors, H is expressed in
feet and decimals of a foot, and « is an angle less than 360°. The
argumen /¥-+%—« is such that if the equilibrium theory of tides were
true, with a water-covered globe, then « would be zero; and « divided
by the speed is the time elapsing after any theoretical equilibrium
high-water until the next actual high-water; we may call « the “lag”
of the tide. If the equilibrium theory were true, H would have a
value which may be computed from the formule given in the Report.

If tidal observations were perfectly accurate, and if the tides were
undisturbed by the weather, H and « would be absolute constants for
each tide and for each port, whatever periods are submitted to
analysis; and in proportion as they are found to be constant so is the
analysis satisfactory.

A knowledge of H and « is necessary and sufficient to determine
the height of water, as due to the particular tide, at any time, past or
future.

The letters+ y, o,7, # have been appropriated to the earth’s angular
velocity of rotation, and to the mean motions of the moon, of the sun,
and of the lunar perigee respectively. Hence the rate of increase of
V or the speed of tide, is expressible by these symbols. For practical
convenience an initial has been adopted to indicate each one of the
tides; and we here reproduce Schedule A of the Report containing
the arbitrarily chosen initial letters, the speed, and a descriptive name
for most of the tides.

The tides involving y in the speed are approximately diurnal, those
containing 2y are approximately semi-diurnal, and those containing
3y, 47, &c., are approximately ter-diurnal, quater-diurnal, and so on.
Those whose speed does not involve y are called tides of long period,
since the quickest of them has a period of a fortnight.

* In the case of the results for the English ports below it is Greenwich n mean —

+ The initials of yi, ceAnvn, HAog, and perigee.

Initials.

a A ai =

SS

2N

Ss
&c.

| Speed. Name of Tide.

Harmonic Analysis of Tidal Observations. Tog

Schedule of Notation.

y—o—qa, and

y-o+a
2(y—<o) | Principal lunar series.
3(y—2)

we.

| 2 | Luni-solar semi-diurnal.

2y—3e+a | Larger lunar elliptic.

2y—o—am and

2y—o+a

Smaller lunar elliptic.

Cea | Tawa ole clipe semudinenall

Qy—40 +20 | Lunar elliptic, second order.
2y—3e—w7+2y | Larger lunar evectional.

|
2y—o+a—2y | Smaller lunar evectional.

|

| y—2e | Lunar diurnal.
| yt2o |

| Y | Luni-solar diurnal.

| y—se+a | Larger lunar elliptic diurnal.

—o—w

included aa ME, Smaller lunar elliptic diurnal.

yto—a | Luni-solar elliptic diurnal.

y—4o+2e | Lunar elliptic diurnal, second order.

|
| y—3o—a + Qn | Larger lunar evectional diurnal.
| Principal solar series.

138 Major A. W. Baird and Prof. G. H. Darwin.

Schedule of Notation—continued.

y

Initials. wad Speed. | Name of Tide. |
| 2y— dy | Larger solar elliptic. |

R | 2y—y | Smaller solar elliptic. |

| y—2y | Solar diurnal.

Mm | o—a | Lunar monthly. !
Mt | 20 | nar fortnipttly, |
Sa | n | Solar annual. |

| 2h | Solar semi-annual. |

MSf£ | 2(o—n) | Luni-solar synodic fortnightly. |
MS | i eo, ) |
uw or 2MS | Dyan | |
Mm | 2y + 20—Ay | |

»>Compound tides.

MK | paailog | |
oMK | Bele | |
na Ay—So+a | |

The operations of the computers give the values of « in degrees and
two places of decimals of a degree, but as the values of « are in no
case so consistent from year to year as to present variations of less
than a degree, the tables have been abridged by the entry merely of
the nearest degree. The values of « are printed in a different type
from those of H, and the degree mark ° has been omitted.

In the case of the ports of Toulon and Brest the results in the
Report of the Committee of the British Association were given in
centimetres, but they have been reduced to feet for the sake of
uniformity.

At the head of the table for each port the epoch, or instant, at which
the analysed observations begin is noted; at every port (excepting

Harmonie Analysis of Tidal Observations. 139

Kathiwadar) the epoch is Oh. of (old) astronomical time, or civil
noon, of the day specified.

In Table I is given the latitude and longitude of the several ports.

In Table II the values are given of H and « for each year or period
analysed for the ports specified at the head; these are the values
deduced from the results of 1872, 1876, 1878, and from those of the
Indian Survey.

The initial of the tide is shown in the margin.

The last column for each port gives the mean of the values for the
years under observation. An inspection of the numbers from which
the mean is derived shows the degree of consistency between the num-
bers obtained in the several years. The number of results is hardly
sufficient to make it worth while to deduce a probable error for H
and «; moreover, it would be a somewhat arduous task to do so.

Table III is a summary of Table II, giving only the mean values,
together with the number of years from which the mean is derived, ©
and this is of much value for the theoretical discussion of the tides.

Table IV gives Mr. Ferrel’s results from the Reports to the United
States Coast Survey.

The tables give altogether results for 43 ports, and for 137 periods
of observation and analysis.

*| We have to thank Mr. Edward Roberts, the importance of whose
work in this subject is well known, for having reduced the results
given in the paper of 1878, viz., those for Freemantle, Mauritius, E.
Falkland, Malta, Marseilles, and Toulon. In several of these the
heights were stated in centimetres, but they are now reduced to feet
and decimals.

Professor Ferrel has carried out an harmonic analysis at several
ports for the United States Coast Survey. The process adopted by
him does not appear to be identical with the method of the British
Association, and there seemed to be room for doubt as to whether the
results were truly comparable with ours. In answer to an inquiry on
this point, addressed to the United States Coast Survey, Mr. Ferrel
kindly sent a memorandum to the Superintendent, Mr. Hilgard,
which has been forwarded for our information... The memorandum,
dated Washington, April 27th, 1885, runs as follows :— |

“The results of harmonic analyses of tide observations of the
United States Coast and Geodetic Survey are found in Report of the
British Association for 1872, and the Reports of the Coast and
Geodetic Survey of 1878, App. No. 11; 1882, App. No. 17; 1883,
App. No.9. The results for Governor’s Island have not yet been
printed.

* This paragraph and the corresponding portion of the tables were added on

May 15, 1885, subsequently to the presentation of the paper. These results of
1878 are only given in Table III, and not also in Table II.

140 Major A. W. Baird and Prof. G. H. Darwin.

‘Those in the Report of the B.A. are by Sir W. Thomson. In those
of the Coast and Geodetic Survey the A’s (amplitude) correspond
with Sir W. Thomson’s R’s, but the e’s (epochs) differ from his by
90° in the diurnal components. These corrections of his epochs I
introduced into my ‘ Tidal Researehes’ in 1874, p. 44, § 28.*

“From areference to Schedule I, Tides of Penobscot Bay, Professor
Darwin with reason concludes that I have not applied this correction
in the diurnal component of the «-tides. This arises from the omis-
sion by oversight of a footnote to Schedule I, as follows :-—

‘“«* For \) read A’—4z in the diurnal component of the K-tide.’

‘““'The corrections have, in all cases, been applied according to this
note.

‘In my ‘ Tidal Researches’ of 18741 have given formule for the
correction of both the amplitudes and epochs depending upon the
position of the moon’s node. These corrections reduce them to what
they would have been if the moon had moved in the ecliptic. By a
reverse method these amplitudes and epochs can be reduced back to
any year for which practical application of the results is required.
In the discussion of tides in Penobscot Bay J have also given small
tables, Tables IiI—VI inclusive, to facilitate these corrections, and
reductions depending upon the lunar node. The double signs, how-
ever, of Tables III, V, and VI, got reversed somehow in copying and
printing; but the signs have been used correctly in the reductions,
even in those of the Report in which the signs are given erroneously,
which shows that they were at first correct, and that the error was
introduced in copying.

‘‘These nodal corrections have in all cases been applied to the
results, so that in these corrected results the irregularity of long
period depending upon the moon’s node is eliminated, and the ampli-
tudes and epochs are the same from year to year, except so far as
they are affected by small irregularities from abnormal disturbances
not completely eliminated. An exception to this, however, is the case
of the St. Thomas tides, in which the reductions were not carried so
far, and these small nodal corrections were not appled to these small
tides. The amplitudes and epochs are those simply belonging to
the years of observations. . . . It is certainly desirable to have
an international uniform notation.

“T should have stated sooner that in Table II, column C, 90° have

* [Notwithstanding this assurance I venture to think that Mr. Ferrel must be
mistaken. For example, at Sandy Hook, it looks as though it were certain that
K,, L, \ have been reduced according to one rule, and the rest of the semi-diurnal
tides according to another ; for the phases differ by about 180°. Compare again
O, K,, P with J and Q at Penobscot Bay.—G. H. D., August 12, 1885. ]

[It may be noticed that « of 8, for San Diego differs by 180° in the U.S. reduc-
tion from the value in the B.A. reduction. I have no evidence as to which is
correct.—G. H. D., October, 1885. ]

Me

Harmonic Analysis of Tidul Observations. 141

always been deducted before using it in the reductions in the case of
the diurnal component of the K-tides.”’

We give below the results above referred to by Mr. Ferrel. We
may remark, however, that the heights have been abridged by the
omission of a place of decimals, and the epochs by the omission of the
decimals of a degree. We have not, however, given quite all the
results of the United States Coast Survey. Mr. Ferrel’s treatment of
M, is not identical with ours, and it is omitted; also there is no
- place vacant for some of the smaller overtides in our schedules. The
reader especially interested in these tides is therefore advised to refer
also to the original sources. The results for St. Thomas are derived
from a letter dated March 10th, 1885, addressed by Mr. Ferrel to the
superintendent, and kindly communicated to us.

From the correspondence it appears that the American results
should be comparable with the others, or at least that the difference
should be insignificant. As remarked, however, in a footnote on the
preceding page, this conclusion is open to doubt. We have thought
it best, therefore, to keep these results in a table separate from the
others. |

142

Aden.

ee Rene ala
Okha Point and Seat Tivbone Gulf ‘of Caton

@eeoeoevecoe eve oe eee

Table I.

Indian Tide Tables.

eoeo4atfoesereee

Kathiwadar or Shial Bet, 8. coast of Kattywar
Bombay, Apollo Bunder ........0.+.ee0ee

Karwar.

Beypore, 7 rales s. of ‘akon
Paumben Pass, island of Ramesweram ..
Mierana ball ote nee kas Us se oe

NY ETc lg Wop epee Recaro AN ay Re STE Nt

ee

eoeereevoeeeee

eevee eevee -@ ee

Wal Pyerh OENERTT a selec sa ne ao oc odo

False Point..

Dublat, Seitteow Tatar, een Fiowahy. ck
Diamond Harbour, River Hooghly..........

Kidderpore, River Hooghly
Elephant Point......

IMBTNEOO 56 555556005050 no SO 5 45C

Amherst
Moulmein.

Port Blair, Het Tana

British Association Reports.

eoceoeeeee ee ee ee ee ee ee ee rere ee ee ee

lat.

12° 47’ N
24 47
22 28
20 58
a8 755
14 48
1 ko

9 16
10 46
13 4
17° 41
20 7925
21 38
22 11
22 32
16 29
16 46
Gs,
16 29
el AW

Major A. W. Baird and Prof. G. H. Darwin.

long.
44° 59’ B

, 66 58
69.7

71 36

72 50

TA iG

F 75 49
79 18
Pe): 79. S23
«- 80> GES

no ele poate . Sake
86 47

88 6

« 88 7a4

88 22

63 te oe 96 19
96 12

nissan a’. (9%) aa
5 ace scat 97 40
92 45

N.B.—Results for English ports are referred to Greenwich mean time.

Fort Point, California. .
San Diego, California .

eseee

Port Leopold, Arctic Rei relens:

Beechey Island, Erebus Bay, Arctic ‘Anchen
Cat Island, Gulf of Mexico....
{OU Ea Sin seeds aids So Ga sona dd eUendod 46
VERA oe Bon Sacco, on} oo. Amen oeo ae So.
Ramsgate ...... apa
vesteiartlepool yen mieueteie clas oieleletale <uetalelreteit
PontlanduBrealawa ber! <a. .os aclee +. cle lela
iDriverg OURS S Coss oe sudds Cec bo aoe deem oon

Helbre Island..

Freemantle, West Mee

Mauritius, Port Louis.

eecerv eee 6 eeeeee

East Falkland, Port es, Berkeley 8 Sound:

Malta wiccs ee ke

Wlarseilless fe cic Se ke cee ten ey Wee ae aeRO

lat.

37
32
74
74
30
43
48
51
5A
50

40 N.

42

long.
pb ae hcvote - 122 15 W.
117 kas
: 91 —
91 54
SNe isire Pe) 0)
5 56E.,
4 30W.
1. 2
sie tae: See 1 12W.
2 © aide ola ene ere
Pres
-. about 3790
115 45 EH
yolecpawe | OM MOR
pleseter 58 OW,
. 14 30E
fons wee 5 23

Harmonic Analysis of Tidal Observations.

United States Coast Survey Reports.

Penobscot Bay, Pulpit Cove, Maine......... 44
Port Townsend, Puget Sound, Washington
MEHTA Viale) 2)21c]6 ple] Val oie eieha\slelerelopsle ~ie.el= «a fo4 AS
Astoria, Columbia River, Oregon........... 46
San Diego Bay, California................ 32
Sem Dhomas, West Inidies 0c. .<0..e.025 0s 18

STATIC YAMA O On teyeleycinacies Selec s esc sescncice ee, AO

lat.

143

long.

68 53 W.
122 48
123 50
117 10

64 56

a i

144 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
Aden.

Commence 0h., March 3.

Weal. o. 1879-80. 1880-1. 1881-2. 1882-3. Mean.
s a 0:073 0°117 0°093 0-077 0-090
l\c = 168 151 161 166 162
R i= 0-693 0 693 0-704 0 °699 0 697
2 = 248 252 246 247 248
a fas 0-006 0 °005 0-006 0-005 0-006
BOs 263 2597 275 290 250
R H = 0-005 0-004 0-004 0 °004: 0-004:
sae = 218 191 210 185 201
g H = 0-001 0-001 0-001 9-001 0-001
ake = 212 238 325 261 259-
M iH =". 0*033 0 °052 0 053 0-048 0-047
ie = 3° 12, 355 45 aX
uM H = 1-578 1°558 1 °569 1 °567 1°568
ae = 228 232 228 227 229
u H = 0-019 0 :020 0°018 0-016 0°018
oe = 220 215 201 202 209
M H = 0-011 0-006 0-007 0:003 0-007
eC = 322 334 318 281 314
M a 0 -006 0 -004 0-004 0-007 0-005
Le = 343 280 26 355 341
M El = 0-003 0-001 0-004 0-002 0-003
oi - 87 49 333 65 43

H = 0-657 0°658 0-646 0°651 0 °653
of; = 38 40 38 38 38

x H = 1-295 297 1-299 1-305 1-299
ae = 36 38 36 36 36

K i 0°218 0-197 0°188 0-202 0°201
Ae = 245 244 242, 246 244

Pp H= 0 °389 0 °375 0-389 0°399 0 °388
e = 31 35 33 on 33

J H = 0°118 0-110 0-083 0-100 0-103
fe = 49 7° 53 35 52

Harmonic Analysis of Tidal Observations.

Table IT.
Aden.

Commence 0 h., March 3.

Wear. ....) #879-80. 1880-1. 1881-2. 1882-3.
aie = 0-174 0-157 0°134 0-139
lk = 40 38 42 48
de = 0-023 0 °063 0°033 0-065
c= 259 230 209 2.23
nia = 0-443 0 °436 0 °421 0-409
c= 223 2,30 224 E22
" H = 0°018 0°020 0-038 0 °026
kK = 123 301 210 155
be H = 0-157 0-182 0-059 0-048
c= 241 2,00 170 293
H = 0-086 Q 082 0-072 0-058
eye = 192 204. 182 204
R ER Saline ded 0-006 a cooeds 0-003
Ko= se cecees Cy GN erate eh ceatiots 356
1. i: enone 0-057 iaiiererlere) ois 0 :042
c= shagies 286 es seee ws 194
H= 0-007 0-020 0-009 0-011
us {f = 136 167 166 167
ear J H = 0-022 0-021 0°021 0-026
25M
c= 106 ICI 114 114
M ag = 0 °035 0-076 0°025 0°033
m .
k= 5 348 324 18
a 0 052 0-039 0-045 0-044
Mf
c= 14 30 26 53
use| = 0°014 0-015 0°016 0°010
kK = 40 295 98 209
Saf = 0-404 0 °402 0 °353 0°399
c= 3 358 2 347
9 ie = 0°110 0°109 0 °093 0°069
sa ik
k= 94 161 I51 99

VOL. XXXIX.

146

ea gees

ee

lal

Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
Karachi.

Commence 0 h., May 1.

1868-9. | 1869-70.| 1870-1. | 187142. | 1872-3.

1 0-072 0°071 0°075 0 -083 0°108
= 177 188 162 158 147
= 10-932 0943 0-923 0-951 0-952
AG 323 324 324 322 322
oe fen eee 0°014 0-013 0-008
= 356 5 o
Se Beh piciateste aia ee Prccete 0-004: 0-012
cee acces | aie apacame lt ee eue 2.93 295
—= 11) 05015 0-030 0-063 0-040
= Bile cb Rees oe 78 23 359
== al Sep ill. 2 °44'7 2 °450 2 °492 2 476
= 294. 295 295 294 294
=| 0:042 0-037 0-048 0-048 0-037
= 333 333 322 332 316
al OF OG 0°027 0-024 0-029 0 °020
= 44 27 28 23 28
=| 0-040 0-046 0-044 0-045 0°046
= 222, 210 218 2,03 214
at oat ie sea oe 0-006 0-006
= Hl pee wopee gal, Aalelleis ee hall teeieiencns 249 266
=| 0-662 | 0-645 | 0-629 | 0-636 | 0°632
= 47 50 48 47 46
— a) ea 1°257 1 °255 279 1-275
= 47 47 48 46 46

ll Il
Ww
N
\o
WwW
oq
Or
Ww «
4
WwW
Ww
nN
Co
Ww
nN
el

| Il
wT
No)
a
4S
Ww
foro
on
lool
0
N

Harmonic Analysis of Tidal Observations.

Table IT.

Karachi.

Commence 0 h., May 1.

1868-9. | 1869-70.| 1870-1.

0-129 0-120 0°138

46 61 54
0-079 0 04:7 0-089
298 321 294
0-604 0-587 0-572
279 281 279
0 :059 0 °037 0-043
335 270 209
0-190 0-081 0-080
254 223 343
0 -066 0-032 0-070
267 224. 300
0°035
age cae 27% See
(1) S961 iE

codes . 320

248 175 116
0-053 0-078 0-037
318 311 259
0-009 0 ‘074 0-057
328 19 159
0-115 0-179 0-162
44 80 107

1871-2.

0-146
50

0-043
356

0-650
280

0-084
207

0°143
284

0-062
254

0-027
221

0-058
Pize

0-020
358

eeceoevese,

1872-3.

0°129
52

0-137
263

0-605
275

0-076

12

eeceee

147

148

Major A. W. Baird and Prof. G. H. Darwin.

e &

Table IT.
Karachi.

Commence 0 h., May 1.

1874-5.

0:076
153
0:949
320
0:008

6
0°007
309
0 :003
266

0-055
66

2°517
292

0-026
336

0-020
8

0-056
212

1875-6. | 1876-7. | 1877-8. | 1878-9. | 1879-80.
0-079 0-087 0-088 0 °044 0-086
150 157 1381 167 161
0953 0°936 0-961 0°922 0-957
320 318 23 324 325
0-008 0-012 0°010 0 °009 0-008
353 a7 23 2:0. 63
0-009 0-006 0 °005 0:008 |° 0-006
495 259 275 , 291 325
0-002 0-001 0-002 0-001 0 :002
283 207 254 126 223
0-081 0:015 0°013 0-035 0-060
36 353 76 54 14
2 550 2-474 2 °468 2°521 2°555
291 291 2g1 2.96 296
0°037 0°037 0-055 0-048 0 042
345 343 327 328 320
0°025 -| 0:°019 0-024 0-031 0 ‘027
15 353 16 2 7
0°055 0-049 0-053 0°051 0-055
206 207 196 215 220
0-006 0-006 0-006 0-004. 0-003
297 281 252 2.69 20
0-649 0 °646 0 654 0-677 0°654
46 45 46 49 47
1-296 1-263 1:278 1°314 1-301
46 44 45 48 48
0-261 0°276 0 °260 0 °240 0 284
321 318 314 329 325
0 °367 0 °368 0° 423 0-440 0-396
45 49 43 44 45
0:104 | 0:077 | 0:°025 0-084 0-102
50 71 88 66 64

Harmonic Analysis of Tidal Observations. 149

Table II.
Karachi.

Commence 0 h., May 1.

1874-5. | 1875-6. | 1876-7. | 1877-8. | 1878-9. | 1879-80.

————— —— | | | e

0°123 0°136 0°124 0-110 0°150 0°154

58 46 35 48 47 50
0-088 0-042 0-085 0-099 0°054 0 ‘066
280 302 306 305 2,63 aR)
0-560 0° 602 0 °606 0 °556 0-667 0-597
2.76 274 PY G/ a. 22 274 280
0-022 0-009 0-040 0-082 0-068 0-019
181 95 300 236 184 35
0-028 0°154 0-207 0°218 0°127 0-089
320 317 285 236 atl BR
0-056 0-070 0-068 0°113 0°041 0:077
274 2,60 280 2; 297 249

Sod oo.0000 OEO0S res vee 0-069 pi siatey ets
“ele SG 0005 308 Sib OO 27S NRT Sieve) alete
ee sony Ih ORtOO: MES. 8 5 OROS9 oe
eee ee ce 08 344 eoeecee 315 qq 0000
0-021 0°031 0-034 0-030 0°033 0-031
304 315 313 326 351 337
0°018 0°025 0°012 0-026 0-019 0-018
150 98 115 63 167 158
0-064 0-067 0-097 OPA ei iaesereroitas 0 040
24 103 42 49 Jon HG 26
0-038 0:010 0 032 0-047 noeGoo 0-030
41 24 I 20) NW oond 00 328
0-040 0-015 0-045 0-038 0-030
333 186 195 Bhi ma So atsats 6 is 318
0°149 0-086 OP i187 0-170 0-042
56 46 80 W2ZOp a lerarnsere ols 86
0°172 0°173 0°145 0-087 . 0°165

150 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
(a) Karachi. (b) Okha. (c) Kathiwadar.
(a) Com. Oh., Mayl. (6) Com.0h., Apr. 16. (c) Com. 12 h., Oct. 31.
(2) (%) (2) (2) (2) (c)
WiGalie' aye 1880-1. | 1881-2. | 1882-3. | Mean. |} 1874-5. || 1881-2.
g 4035 0-076 0-066 0-082 0-074 0°134
Vin = 64 174 172 158 150 || 201
R as =| 0:°969 0-960 0-962 0°948 1°222 1-207
eplek Vt ae Bet 324. 324 322 14 81
R { inh = 0-006 0°012 0 :008 0-010 0°013 0-029
“108 i= 31 12 35 14 117 273
R ig =| 0:006 0-008 -0 006 0-007 0-003 0°013
Sle = 292 314 287 295 21 42
g { H =| 0:001 0-000 0-001 0-001 0-001 0-002
Sic Il 124 162 204 220 264
M, JH=j; 0:059 0-048 0-062 0°044 j| O°051 0°057
le = | 4 Bitg 39 61 30 43 35
M hg =| 2:°5386 2 °541 2-558 2-504 3 °820 2-970
ste =| i298 2.94 294 294 347 55
M. {e =} 0:°039 0-034 0-030 0°039 ~ 0°030 0-020
3k = 319 327 336 330 21 152
M he =} 0:°026 0 °027 0-023 0-024 0-136 0-220
Geli ates 17 VA RESO 14 107 178
M es =| 0:052 0-049 0-044 0 049 0-007 0-139
a 209 207 204 210 270 137
M { H =j| 0:002 0-009 0-002 0-005 0-011 0 002
8 =
B= 341 259 262 267 96 199
O { H =| -0°632 0-654 0-645 0 647 0-693 0°720
se 46 46 47 47 57 66
K ae =| 1:°246 1 -295 1°310 1-281 1°414 colon bib
1
B= 47 47 47 46 53 66
K. H=j]} 0:°415 0-269 0-234 0-278 0-328 0°324
“lke = Bee Bi 321 320 17 19
P a =| 0°266 0-396 0-396 0-380 0-384 0 °436 ©
fe 49 46 44 46 Be he
7 { H =! 0-066 0-063 0-099 0-079 0-107 0°175
kK = 106 53 38 7O 81 107 K

Qt.
re
ae
oe

{
Vv
K

flarmonic Analysis of Tidal Observations.

(a) Karachi.

(a)

1880-1.

0°104
51

0°123
310

0-581
276
0-020 °
313
0-169
314
0-037
2.83
0-040
ai
0 :094
330
0°028
307,
0-031

120

0-036
131

0-020
41

0:018
302

0°102
102

0°139
192

(2)

1881-2.

0°124
64
0 096
291
0-631
279
0-029
Palas

0-211
264

0:081
267

0-030
327
0°030
121
0°055

7%

0-034
254

0-043
3\u
0-100

50

0°116
164

Table IT.

()

1882-3.

0°132
61

0-076
293

0-594,
280

0-001
2.36

0-125
2.36

0:039
270
0-009
Bus
0:021
41
0-024
328
0-021
115
0-040
94

0-006
128

0-023
148

0-099
el

0-098
194.

151

(b) Okha. (c) Kathiwadar.
(a) Com. 0. h., May 1. (6) Com.Oh., April 16. (c) Com. 12 h., Oct. 31.

(4)

Mean.

| ee ee ———————E

0°129
5%

0-081
Ae)

0-600
277

0-042
282

0142
277

0:061
2,63
0-030
2,76

0 :068
332

0 :027
307

0:021

123

0-060
95

0°033
316

0-086
266
0°138

79

0°135
142

(0)

-

152 Major A. W. Baird and Prof. G. H

Table IT.

Bombay.

Commence 0 h., January 1.

Wear 2. 4nd 1878: 1879. 1880. 1881.
R hs 0-075 | 0-083 | 0-088 | 0-074
ie 187 184 182 179
R a =| 1-614 | 1°634 | 17627 | 1-618
7k = 3 2 4 3
g a =| 0-018 | 0:013 | 0-013 | 0-011
“lke =| 257 235 239 315
R is =| 0-002 | 0-004 | 0-004 | 0-005
Se = 195 179 140 160
g ie =| 0:002 | 0-002 | 0-001 | 0-002
ES = 86 196 151 69
mu. JH =| 0-024 | 0-036 | 0-086 | 0-065
ah 46 105 51 19
M. He =| 3:991 | 4-041 | 4-065 | 4-058
alte =a) 330 329 330 331
u.f[H=| 0:074 | 0-067 | 0-068 | 0-055
SNe 32 28 25 11
uM a =| 0119 | 0-129 | 0°120 | 0:126
"UK Eq | .320 327 314 324
um. fH =| 0-014 | 0-015 | 0-002 | 0-017
eile’ Sage 110 479 113
mu. fH =| 0-003 | 0-004 | 0-002 | 0-004
ie = 316 347 313 13
a ie =| 0°643 | 0°650 | 0-663 | 0-647

c= 48 48 48 48
K e =| 1-384 | 1-391 | 1-393 4) 1-398
aS ewe 45 45 45
K ye =| 0-412 | 0°394 | 0:427 | 0-431
*lk =| 349 353 355 353
p { H =| 0:404 | 0-400 | 0-406 | 0-403
eu | 42 43 44 42
slH =| 0:043 | 0-083 | 0-128 | 0-122

k= 89 48 62 83

. Darwin.

1882.

0:072
179
1°616

4
0 -006
233

0-002
182

0-000
42

0-045
26

4014
330

0-060

21

0°124
328

0 :008
124

0-005
46

0-645
49

1 °398
45

Mean.

0:078

182 |

1°622
3

0°012
256

0 -003
271
0-001
115
0-051
49
4 034
332
0-065
23

0-124
322

0-011

ill

0-004
352
0-650
48
1-393
45
0°410
352
0-402
4.2

0-089
42

Lan So

Harmonie Analysis of Tidal Observations.

Table II.

Bombay.

Commence 0 h., January 1.

1878. 1879, 1880. 1881. 1882.

0°122 0°138 0-159 0°133 0-101

47 60 55 400 oh 5O
0122 0:054 | 0:128 0:094 | 0:148
299 348 325 306 298
1-024 1-036 0:991 0974 0-988
gp Bas 316 PHS ie) eta?
0-051 0-023 0-030 0:°013 0043
234 254 W574 | |e 403 277
0-288 0-245 0-078 0-121 0-261
319 283 269 9 336
0-231 0-189 0-214 0182 0-212
313 294 314 301 318

OnOAG iW ermesctae: ie OWOSM ia aeashes

301 Adooor 265 dodood

Brees OnOSHe puted, Sy OR25G head

esi aln dip 46 ve eees 2 Soon

0-122 0-138 0-126 0:125 0134
17 30 2 25 25
0-039 0-025 0-048 0-036 0-033
gI 125 112 109 94
0-058 0-049 0 -042 0-047 0-085
315 355 86 SON) ise
0-068 0054. 0-054 0 029 0-052
346 7 I 250 “47
0-056 0-016 0-042 0-019 0-023
198 287 184 334 136

0-254 0-137 0-173 0°188 0°179
117 She 313 317 355

0-068 0°124 0-071 0°201 | 0:°145
304 223 162 232 218

153

Mean.
0°1381
52
0-108
316
1°003
314
0032
235
0-199
315
0-206
308

0-042
2.83

0°171
24

0-129
2a

0-036
106

0-056
26
0-051
346
0-031
228
0-186
358

0:°122
228

154 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.

Karwar.

Commence 0 h., March 1.

Moar... 2.0% 1878-9. | 1879-80.| 1880-1. | 1881-2. | 1882-3. ] Mean.
s, { =| G7, 0-075 0-055 0-052 0 -035 0 057
Pala 159 149 156 165 167 159
9 i =| 0-631 | 0-629 | 0-621 | 0°616 | 0-625 0°624
oN Saat. BBs 336 334 333 335 335
R fe 0-007 | 0-007 | 0-016 | 0-011 | 0-011 0-010
ole = 115 87 94. 110 92 100
g Us =| 0-002 | 0:007 | 0-004 | 0-006 | 0-006 0-005
Baliiic ta 32 58 82 51 39 52
g i —| 0-002 | 0:002 | 0-000 | 0-002 | 0-004 0 -002
pain ae pee 295 297 283 303 304
“3 ie =| 0°019 | o-or7 | 0:049 | 0:045 | 0-036 0-038
ea iicj 70 45 29 10 48 41
my eS) see) a8 | ere ald edo ae 1-742
aoc. 303 303 301 301 301 302
uw oe 0-012 | 0-014 | 0-018 | 0-012 | 0-012 0-014
alc 280 286 275 264 261 273
Mu ha =| 0-045 | 0-059 | 0-054 | 0-059 | 0-060 0-055
tLe = 28 22 iri 16 | 17
M. a =| 0:013 | 0-010 | 0-013 | 0-011 | 0-009 0-011
Sas 289 2.83 209 2,84 287 234
= fe =| 0-001 | 0-003 | 0-004 | 0-002 | 0-002 | 0-002
ica 210 51 9 58 215 109
0 = =| 0-496 | 0:498 | 0°505 | 0:494 | 0-493 0-497

ke 50 50 49 48 49 49
K cs 1-001 | 0-996 | 1-010 | 1-008 | 1-006 1-004.
ee a 47 45 44. 45 45
Ks 2 =\"'9-175 | 0-174 | OPE Oa7s | “0-160 0-174.
eS | 214380 329 327 333 330 330
* ie =| 0-269 | 0-274 | 0-282 | 0-287 | 0-274 | 0-277
k= 41 43 43 41 40 2
J te =| 0-046 | 0-078 | 0-087 | 0-064 | 0-065 | 0-068
2 = 51 55 71 67 42 57

Harmonie Analysis of -Tidal Observations.

‘Table IL.

Karwar.

Commence 0 h., March 1.

1878-9. | 1879-80.| 1880-1. | 1881-2. | 1882-8.

0-111 0°133 0°130 0°101 0-097

57 62 54 58 63
0-093 0°041 0-059 0-038 0 °050
326 325 318 292 324
0°416 0-426 0°413 Q -400 0°397
282 284 282 281 279
0°022 0-004. 0-032 0-021 0-021
244. 122 29 341 268
0°077 0 °136 0-122 0-057 0-047
340 297 261 232 338
0°033 0-057 0-046 0-051 0-033
283 245 260 244 284

cece OUT eect 0-009 “Cede
bic GM a estar ee 2,30 :

wesiere'e 0°046 coeeee 0:075 Serere

we cees 9 cone 300 Seton

0°022 0-028 0-021 0-029 0-028
80 75 61 60 60

0 ‘012 0-004 0-004 0007 0-009
31 Bae 15 166 351

0-046 0-061 0°048 0-043 0-126
351 14 100 fe) 32

0°051 0-058 0 034: 0-038 0-027

345 I 346 14 a5
0-029 0-023 0-021 0-009 0-030
214 268 22,2, 89 27

0°170 0 *344 0-491 0°383 0 °373
32% 307 393 393 317

0-045 0-083 0-128 0-053 0°033
297 202 191 224 225

156 _ Major A. W. Baird and Prof. G. H. Darwin.

DV Ga). 5 walde 1878-9.
1 4
k= 120

EH = "3
S24 == 5 e
ss == 140

H = 0-004
8. { | | 252

el 3) OO
S54 = a

ea Oy.
Mh 4 = 146
wifEz] 920
he aL a
4
at, { t 0°021
K 45
Mee) ee
M,{ t ce
37
orb t 0°337
k= 58
rene E te
ey Ee
Bai: =| 0°184
Land 49
+ =| 02035
k= 67

Table II.
Beypore.

Commence 0 h., December 1.

1879-80.|} 1880-1. | 1881-2. | 1882-3.

_—_— | |

0-083 0-093 0°073 0°035
2047 187 185 173

0°310 0-308 0°341 0 °359
19 22 17 12

0-003 0-004: 0-006 0-007

118 133 145 148
0-004: 0-003 0-006 0 :010
244. 2,66 22,7 248
0-000 0-001 0:001 .| 0-001
252 45 319 339
0°032 0°038 0-024 0 °032
69 2.3 40 go
0-904: 0°895 0 °950 1:001
oo 333 329 344
0°010 0011 0-010 0-009
184 2CO 196 194
0-015 0°018 0 °020 0-026
36 53 41 31
0 004 0-003 0-006 0:012
114 184 138 133
0°010 0-007 0-008 0-009
130 140 162 162

0°338 0 °334 0°337 0-356

57 59 57 55
0-691 0°683 | 0°715 0:727
53 54 51 47
0-079 0:089 | 0-069 | 0-098

3 13 Il 17
0-188 | 0 nO O77. | Lone
56 57 54 48

0-047 0 064 0°040 0-034
44 84 82 40

Mean.
0°061
174
0-330
18
0:°005
137
0:°005
247
0:001
339
0-029
73
0:931
329
0:010
197
0-020
41
0-007
138

0-008
146
0-340

Ly

Harmonic Analysis of Tidal Observations.

1878-9.

0-078
68

0:018
349

0°191
306

0-004
187

0-035
249

0-024
202

1879-80.

Table II.

Beypore.

Commence 0 h., December 1.

0:089
46
0:037
341
0°189
309
0°012

I

0° 041
20
0 :020
349
0:017
163
0-043
87

0-004
80

0-004:
219

0-072
85

0:086
18

0:037
167

0 °344
316

0 °252
181

1880-1.

0-082
59

0-020
342

0-190
302

0°013
2.89

0-050
354

0°008
203

1881-2.

0°078
62,
0-033
347
0°199
307
0-017
Mee
0°095
2.96
0:014
299

0-028
101

0°036
fe)
0-008
Bi
0 004:
243
0°144
33
0°118
48
0°041
M7)
0°321
329
0-189
193

1882-3.

0-078
67

0°025
I
0°215
299
0-011
354
0°053
277
0 °030
239

157

Mean.

0-081
66
0-027
348
0:197
305
0-011
313
0 :055

311

0-019
258

0-023
1g)

0°040
19

0-009
7d

0-005
296
0°091
32
0:071
23
0:°088
216
0-309
313

O°177

205

Major A. W. Baird and Prof. G. H. Darwin.

158
Table IT.
Paumben.
Commence 0h., October 1.
Year 1878-9. 1879-80. 1880-1. 1881-2. Mean.
g [H=| 0-036 0-049 0-035 0-022 0-036
Le 146 131 153 163 148
R a =| 0°377 0 375 0:377 0-360 0-372
ae go 92 gI 94 92
g JH=| 0-005 0-001 0-004 0 +003 0-003
4\|« = 287 191 262, 304 261
gs JH=| 0-002 0-001 0-005 0-006 0-004.
Sar 246 168 195 179 197
R =| 0:004 0 +005 0-002 0-001 0-003
as 249 255 257 135° 224
Mr =| 0-013 0-009 0-013 0008 0-011
ke = 17 38 64 19 35
uo.JH=| 0°589 0-585 0°598 0 569 0-585
eS 47 47 46 49 47
uJH=| 0-016 0-016 0-015 0-017 0-016
ae 170 168 165 177 170
uM he =| 0-020 0-016 0-015 0-014. 0-016
ean 199 IYO 199 187 194
“5 ie =| 0-011 0-011 0-011 0-009 0-011
sa 42 50 40 34 42
va te 0-005 0-004 0-004 0-007 0-005
le = 294 348 303 313 314
o{® =| 0-114 0113 0-116 0115 0-115
a= 47 45 43 47 45
K Wi 0-297 0-293 0-295 0-291 0-294,
le = 44. 45 45 49 46
k ee 0103 0-110 0-116 0-121 0°113
4 84 92 89 94 go
plH=| 0°105 0-110 0108 0-115 0-110
t= 44 47 46 50 46
s{H=| 0-008 0-013 0-014. 0 ‘021 0-014
k= 68 44 38 42 48

Harmonic Analysis of Tidal Observations.

Table II.

Paumben.

Commence 0h., October 1.

Meats. | 1o7s_o. 1879-80. 1880-1. 1881-2.

Q Jel = 0-025 0-021 0°023 0°016
te = 84 98 gl 81

a = 0 °023 0-026 0:016 0-026
ome 56 49 79 50

N H= 0-076 0-087 0-084 0 :082
DY 29 3° 32 (ele

fa = 0°017 0°023 0-008 0-014
La 63 24 354 173

yiH=| 0:016 0-034. 0-030 0-027
ee 82 49 15 334

H = 0-004 0°010 0012 0-011
Bye = 78 98 95 148

oe Sosa agcr EOWA eee Ga 6 . 0-019
Ko = | ceevecce 133 S06 OO GHeo 94

T = | codcocse OROSSi eS Wikis ass s 0-012
Hg ant Hi aseie tow! se sce 104: So dolas oe 79

Ms {2 = 0021 0°017 0°018 0:017
kK = 292 294 286 295

29M H= 0010 0-008 0 °012 0-008
kK = 6 338 340 288

Mm { ( = 0-063 0-053 0-033 0-043
[2 a 349 58 23 40

pes 0 0-040 0-053 0-033
ate 2 300 359 344

mst { 2 = 0-016 0-013 0°027 °0:007
fei 174 209 157 27

Sa4 i = 0°122 0-138 0 °164 0-171
kK = 299 318 287 304

Sie H = 0°138 0-178 0-184 0°129
k= 96 110 117 TE

159

160

Major A. W. Baird and Prof. G. H. Darwin.

Negapatam.

Table Il.

Commence 0 h., December 6.

I tl

ll

He A Eh ale Ip

HW el it

ll ll

ll ll

0-048
117

0°271
2,83

0 °006
136
0-000
135
0-001
225
0-003
Loe)
0-712
251
0-003
73

0 °023
76

0-010
130

0-005
297

0-092
320
0-222
345
0-071
281
0-083
342
0-006
348

1882-3.

0-044
100

0°:277
236

0 :004
166

0:000
166

| 0-001

228

0-006
13

0:727
252
0-003
133
0:018

77
0:0138
126
0 °004
309
0:089
323
0°227
345

0-082
291

0-085
350

0-016
307

Mean.

0 °046
108

0°274
284

0-005
151

0-000

150

0-001
227

0-005
ii gt

0-720
252

0-003
103
0-021
He]
0°012
128
0 005
393
0-091
B22
0°225
345
0-077
286
0-084:
346

0:O11
328

Madras.

Commence 0h., February 1.

1880-1. | 1881-2.

0:037
80

0°437
277

0-002
98

0-002
61

0-01
131
0-019

4
1°047
249
0 004
65
0-002

130

0:010
I61
0-002
331
0:094
327
0:294
340°
0-121
278
0:°093
341
0 :029
337

0-026
96

0-445
275

0-002
169

314.

1882-3.

0 °012
99

0-440
276

0°001
218

0-001
176

0-001
291
0-004

65

Mean.

0-025

92
0 °441
276

0-002
161

0°001
1iZ

0-001
162

0-008
7

1°049
248

0-004
62
0-003
146
0°010
cor
0-002
46
0-097
325
0 293
340
0°112
280
0-097
Sat
0°021
318

=e
nee

Harmonic Analysis of Tidal Observations.

Negapatam.

Commence 0h., December 6.

ams {=
K —
Mim {
Kk

me
kt =

mst {
Kk
ss

K —

Sea { a
K =

VOL. XXXIX,

1881-2. | 1882-3. |

0-007
143

0-022
278

0°164
242

0-025
234

0:°048
228

0-018
132

0-007
219

0-081
279

0°152
246

0-005
229

0-047
206

0 °024
mie
0-031
349

Table IT.

Commence 0h., February 1.

0-004
140

0-037
278

0-246
243

0-027
348

0-053
2,09

0046
184

120

Madras.

0-003
150
0°017
335

0°235
240

0-025
283

0-007
287

0-048
167

0°016
103

0 °056
257
0°001
54

0°022
220

0-047
130
0-050
349
0 °034
46
0°335
225
0°383
149

0-009
43

0-054
310

0-288
242

0:°035
268

0:072
318

0-030
183

eocoaoe

161

162

Wear ..5055

H

Major A. W. Baird and Prof. G. H. Darwin. q

Table ITI.
Vizagapatam.

Commence Oh., February 3.

1879-80. 1880-1. 1881-2. 1882-3. Mean.
= 0-028 0°047 0 035 0-096 0°052
= IOI 77 92 I 68
= 0 674 0 659 0°651 0-641 0-656
= 280 286 286 290 285
= 0-001 0°007 0-006 0-006 0 °005
= O a4 50 60 47
= 0-001 0-001 0-001 0-002 0 ‘001
= 124 128 214 20s 170
= 0:001 0°001 0-003 0:001 0 °002
= 73 103 61 78 79
= 0 °023 0 °021 0:°001 0 °004 0°012
F 355 23 199 242 295
= 1 °532 1-460 1 °459 1 °439 1 ‘473
a 249 253 254 255 253
= 0-007 0°001 0-006 0:008 0-006
= 332 208 41 14, 329
= 0014 0:014 0°015 0:018 0°015
a ge 331 38) 342 331
= 0-003 0-004 0 °005 0-008 0°005
aj 144 78 30 35 72
= 0-004 0-002 0-002 0-005 0-003
= 174 214 243 206 209
= 0-139 0°140 0°144 0 °142 0°141
s 330 334 335 329 331
= 0°371 0°364 0°366 0-335 0 °359
5 338 342 342 346 342
= 0°179 0°157 0°168 0-306 0 °203
= 270 274 2.85 278 277
= 0:°112 0°104 0°117 0-049 0-096
= 336 346 346 329 339

0-035 0 027 0-014 0-024 -0°025

328 356 314 351 337

Harmonic Analysis of Tidal Observations,

Table IT.
Vizagapatam.

Commence Oh., February 3.

1879-80. 1880-1. 1881-2. 1882-3.
0-010 0:007 . 0 004 0°014:
20 2G 306 336
0-049 0°044 0-027 0-088
257 2.4.5 297 217
0°355 0-300 0°291 0°309
243 250 251 24.2,
0°021 0°019 0-022 0-024
201 332 244 278
0-114 0-055 0 °002 0°127
244 199 72 2,83
0 ‘030 0:026 0:016 0 034
234 259 218 326
55 1006 OOS Ne ee oose 0 °039
elke) 8a) « 130 se neee 2.4.6
Pr eeor 0-021 Soba ae 0-080
son onn 336 Lone be 189
0-007 0°010 0°014 0°015
SAR) 20 20 357
0-008 0-010 0°015 0-016
210 292 250 148
0 :022 0-078 0-049 0°072
2,2, 53 toe 35
0 °030 0°051 0:061 0:027
23 340 2 2
0:076 0°021 0°038 0 °048
22 13 314 102
0 °740 0°833 0°577 0:707
190 U7 189 175
0°301 0°328 0°458 0°241
89 126 140 101

M 2

163

164 Major A. W. Baird and Prof. G. H. Derm

Table IT.
False Point. Dublat.
Commence 0h., May 1. Commence 0h., April 22.
Year ......| 1881-2. | 1882-3. Mean. 1881-2. | 1882-3. Mean.
9 Ws =| 0-006 0-024 0-015 0 044: 0 °050 0-047
Sle = B25 48 6 99 120 110
q fH = 1:°005 1-°030 1°018 2 °053 2°1638 2-108
Oa e302 304 303 327 326 327
R es =e 007 0°008 0:008 0°025 0-011 0°018
tle = B31 S| 329 202 2.20 211
R ha = 0-008 0-003 0 :003 0-002 0005 0-004
Sle = 153 185 169 120 78 99
9 te =| 0:°008 0-008 0°003 0-004 0-007 0-006
ee 219 261 240 116 110 113
M ie = 0-009 0-008 0-009 0-008 0-007 0-008
‘Le = 66 355 30 345 97 41
M He) 2a 2°253 2 °250 4°623 4.°596 4-610
Sih ie Ss 269 27% 270 290 290 290
M 1s = 0-012 0-016 0°014 0-049 0°043 0 °046
2 L3-= 34 27 30 131 135 133
M Fs LOEOSS 0°041 0°038 0-101 0-089 0095
SUS eek: 2.36 2.30 143 145 144
M H = 0-006 0-014 0-010 0:014 0:°013 0:014
Sle = 80 47 63 275 2,36 255
M i 0-003 0-002 0-003 0:014 0-009 0°012
Le = 229 2.62 246 316 273 294
D1. me Oo 1K) 0°179 0°177 0°181 0-197 0-189
fe he 335 655 555 332 335 334
K Re =| 0-408 0 °407 0-408 0°498 0-488 0-493
7 Shea ah oae 346 345 353 350 352
K Ho) 0-268 0241 0°255 0°573 0°618 0°596
apa = 296 297 297 310 325 318
P Ve =| 0:°188 0°157 0°145 0-158 Or tad 0°155
Sica 349 340 344 336 351 343
7 isl = 0-021 0°030 0-026 0:051 |. 07016 0°024
c= 306 319 312 352 396 324

Harmonic Analysis of Tidal Observations. 165

Table II.
False Point. Dublat.
Commence Oh., May 1. Commence 0h., April 22.
Year ......| 1881-2. | 1882-3. | Mean. 1881-2. | 1882-3. Mean.
ate =| 0:004 0°017 0:011 0-010 0-008 0-009
[n= 307 340 324 306 I 333
La =| 0-068 0-050 0-059 0°175 0-158 0°167
k= 281 ERT 2.54 291 292 291
nie =| 0:471 0°481 0-476 1°041 0 °852 0-947
k= 265 2,68 267 285 286 286
ate =| 0:°045 0°081 0°063 0-298 0-189 0°219
Ss 277 83 180 339 293 316
ae =| 0°163 0°120 0°142 0°271 0 °192 0-232
k= 247 24.1 244. 261 24.0 251
ee =| 0-070 0-080 0:075 0°218 OsLit 0°165
P\ kn = 266 280 Pig 10 19 15
R{e = 0-034 0 °034 ove rnars 0°219 0-219
k= 2G ZI Sale sae 289 289
eis ee gO; Ola We OLOIG? Ita NL Os [. 0*139
fee seis eves 149 Aly WN BEE Be 299 299
MS {i =| 0:039 0 042 0 :041 0-094 0-059 0:077
je 272 275 274. 171 139 155
H=/; 0-019 0°014 0:017 0-097 0-046 0:072
2MS
t= 196 177 187 195 oy) 211
Mm { =| 0:053 0-072 0 :063 0-045 0-035 0-040
ea 53 58 55 29 125 77
me{ =| 0-061 0:073 0-067 0-056 0-039 0°048
foe 37 33 35 61 71 66
= | 004i 0-059 0°050 0-049 0:077 0°063
MSf
t= 279 73 356 278 75 356
g ie =| 0°746 0-840 0-793 0-796 1-003 0:900
a
k= 166 166 166 147 154 150
g Wie =| 0°364 0°210 0-287 0°234 0°182 0-208
sa a
k= 142 149 146 162 110 136

166 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
Diamond Harbour. Kidderpore.
Commence 0 h., April 4. Commence 0 h., March 22.
Year......| 1881-2. | 1882-3. Mean. 1881-2. | 1882-3. Mean.
g eg = OF 082, 0-088 0-085 0-094 0-088 0:°091
Pile = 156 147 152 197 190 193
9 fs =| 2:°215 2 °288 2°252 1°427 1 ‘508 1-468
2k = 26 25 26 102 101 101
R Ss =| 0°117 0°122 0-120 0-066 0 °084 0-075
Alpen == 328 323 326 126 II 119
Sg =| 0°013 0°‘013 0°013 0°006 0 °004 0 005
ic 266 235 25i 266 332 299
R ie =! 0:002 0-004: 0 °003 0-006 0-009 0 ‘008
PUN SHS werk 42 353 2.98 323 311
M fH =| 0-020 0-020 0:020 0°012 0°013 0°013
Mle = 88 103 95 112 202 157
M. H=j| 5:175 5°179 yaa Wir g 3 °593 3 ‘660 3 627
TALK oes 345 344 344 59 58 58
M H=,| 0:042 0°028 0 °035 0°012 0°018 0-015
ele = 220 225 B28 335 328 331
M =| 0°756 0°734 0-745 0°734 0-719 0°727
ale 246 245 246 39 35 37
M 70) 156 0-148 0°152 0°158 0 °160 0°159
oiler a 106 105 106 223 315 319
M H= | 0-065 0 °058 0-062 0-074 0 082 0°078
AGE eal ee ay 343 345 276 263 270
O Bl = 0-237 0-230 0 °234 0-228 0°211 0°220
C= 344 346 345 22 20 21
K =| 0:499 0-492 0 °496 0-390 0°387 | 0:389
See = 15 14 14 58 54 56
K H=]| 0-667 0644: 0-656 0-439 0°431 0 °435
“ie = 20 ae 23 go Iol 96
P H={ 0°176 0°174 0°175 0°146 0°142 0°144
k= 6 12 9 42 52 47
4 Pe =| 0:029 0°033 0°031 0:016 0:012 0°014
kK =| 299 340 320 355 298 327

“aig

Harmonic Analysis of Tidal Observations. 167

Diamond Harbour.

Commence 0 h., April 4.

Year ....-.| 1881-2.

H—=! 0-024
oo ae

Tae 0-174
———

S57)

H=]| 0:°988
Nt = 339

‘hea 0°171
t= 19

H=,| 0:°420
Tlic =| 294

eS O22
pe "79

R ey iaire vale

C= eeoneeks

T tS ae ar sae
K — e

H=)]| 0°687

MS | = 286

2SM =} 0-095
a 251

Mm | 2 0-147
c= ee

ce = 36

K 26

g Jal =}. bei

a

ct = 140

Sad Ish =|) OO 28

1882-3.

Table II.

Mean.

Kidderpore.

Commence 0 h., March 22.

1881-2.

0-039
358

1882-3.

Mean.

168 Major A. W. Baird and Prof. G. H. Darwin.

Table II.
(a) Hlephant Point.
(z) Commence 0 h., May 24.

Rangoon.

Commence 0 h., March 1.

(2)

NMieaT i siento OO oe. 1880-1. 1881-2. 1882-3.
9 i 0-113 0-120 0-123 0-097
fi Ss 79 141 129 129
g jel = 2 337 2-009 2 003 2 025
2g Se 143 169 170 173
g 1F = 0-037 0-076 0°088 0-079
Sele oe 162 262 256 258
g i. = 0-021 0-011 0 -009 0-011
Se 94 42 39 63
g i 0-008 0-006 0-003 0-005
Sle = 60 119 117 122
M H = 0-019 0-049 0-037 0-013
Dal he a — 88 151 2.36 163
M c= 5 ‘870 5 539 5 °519 5°577
2 = 103 130 132 131

Pe)

M B= 0-025 0 -009 0-016 0-038
2B 146 238 154 142

M jet = 0-079 0-388 0-424, 0-418
ale. 46 167 171 168

M a = 0°205 0-236 0-227 0°235
Sle = 349 85 89 87

M ie 0°031 0-074 0-083 0-087
R= B22 92 103 96

O leh = 0-349 0-289 0-294, 0-300
eo 356 30 PA, 28

K ey = 0-807 0-674 0-682 0-653
ela 18 35 35 36

K ie = 0-401 0-535 0 °576 0 +598
ale = gI 168 173 165

Bac ~ 0-199 0-134 0-148 0-166
ee 33 61 52 es)

7 i 0°110 0 -049 0-023 0-018
k= 61 70 gi 298

Harmonic Analysis of Tidal Observations. 169

Table II.
(a) Hlephant Point. Rangoon.
(a) Commence 0 h., May 24, Commence 0 h., March 1.
(«)
Mica. 7). .!. 1880-1. 1880-1. 1881-2. 1882-3. Mean.
Q a 0-042 0-028 0 024 0-028 0-027
ie 336 9 29 56 31
el = 0 346 0-368 0-327 0°525 0-407
C= 109 153 158 160 157
NA = 1-643 1045 0-949 0:°977 0-990
t= 80 117 120 115 17
x a = 0659 0-299 0-290 0°181 0-257
c= 145 174 184 152 170
. H = 0-681 0°4'79 0-288 0°184 0°317
p= 209 94. 75 130 Wee
3 = 0 °356 0-497 0°508 0536 0°514
Fae — 279 289 295 286 290
R Eats cr ios eksich WP aye stahes 0°117 ac 0000 0d 0°117
Wepe—dl seese da tolaia sar war iohSte 60, Wal oro som : 66
1, ERE all et arrel Actes heel| veh sista a ote 0-290 coboluo Oc 0-290
Real Palcte aia or A | ® sve) s/airal eis : WS NES BBO BG 128
MS {0 = 0°135 0°349 0°415 0394 0°386
k= 67 207 ie, 210 210
Ea 0 042 0°173 0-155 0 °153 0-160
25M.
aia 84 46 54 61 S4t
Min. j. == 0°145 0°296 0 °230 0-182 0-236
a 6 2, 9 39 2:3
ei = 0-098 0-168 0 °223 0-233 0-208
as 310 35) 27 38) 34
Mss {0 = 0-059 0°515 0°559 0°588 0 °554
ma 273 45 bts 49 48)
safe = 0-930 1-600 1°415 1 °4.44: 1-486
k= 146 144 153 baa 150
9 ie = 0°261 0°193 0°012 0°174 0°126
sa,
kK = 198 306 315 3 328

170 Major A. W. Baird and Prof. G. H. Darwin. q

Table II.

Amherst. Moulmeia.
Commence 0 h., August 5. Commence 0 h., April 17.

N.B.—The MS. gives H of Kz=1°771 for 1880-1; an obvious mistake. The mean
has been corrected. :

Wear 2sa as 1880-1. | 1881-2. | 1882-3.] Mean. || 1880-1./} 1881—2.|1 882-8 | Mean.

R H=)]| 0°426| 0-148 | 0:096] 0:222 0°095 | 0-099 | O0°095 ) 0-096
LS 178 149 97 141 146 155 148 149

4 ‘3 —| 2-851] 2-705| 2-750| 2-769 | 1-400| 1-344] 1-343] 1-362
cS 109 Iol 105 105 148 145 150 148

R H = 0°095 | 0:°118 | 0°104] 0-106 0-068 0°069 | 0-065 0-067
Te, = 147 102 iy iz2 2.30 225 231 229

R H=}| 0:°022; 0-004} 0-009 0°012 0-006 0-006 0:004 | 0-008
eae a — 222 221 11g 187 178 187 185 183

q aa 0-009 0 006 0-009 0-008 0-002 0-001 0-002 0-002
“2 oe SS 209 348 269 276 164 252 218 211

M Fs 4) (07-04 0°021 0 °035 0 °032 0:034 | 0:°019 | 0-002 0-018
te = 192 293 300 255 128 101 183 138

M HS) 65280) 67081) ) 6780". 6-233 3°884 | 3°698 | 3°756] 3°779
ic 70 68 68 69 112 vie 115 113

M Fe 4) O-034.4 907008 0-019 0°019 0 023 0°031 0:020 | 0:°025
=e = 287 224 273 261 274 ams 139 209

M eS = 0 2738 0 °423 0°355 0-350 0-926 0-880 | 0:°897 0-901
tle = 60 51 41 51 169 170 174 171

M Ei) (0-070 120146 0-139 0°118 0°105 07107 | 0°095] 0O:°102
is = Bag 248 251 250 200 198 201 200

M ‘fie =| 0-006 0°014 | 0°021 0°014 0:034 | 0-036 | 0°044] 0-038
Sc == 282 244 220 249 125 I4I 134 133

O 1g =H OrslOgesO slg 0°323 0°317 0-256 0°252 | 0°252] 0-253
kK =| 328 339 352 339 a+ 49 50 48

K eg =| 0°668| 0°686 | 0°744] 0-699 0°452 | 0°447 | 0°414] 0°4388
ae = 3 6 6 5 39 40 42 40

K le = O77 0°858 | 0°682 0°770 0-409 0-282 0-316 | 0°336
ag gI 81 97 90 151 152 162 155

1 iy == Hh 10-132 103193 1) O)-207 0°177 0°1138 0:144 | 0°144] 0°1384
k= 308 348 354 337 62 61 57 60

iT he i 109 1 3008s | 0° O3st 0074 0:088 | 0:018 | 0-009 0-022

k= 13 7 82 34 52 48 222, 107 |

Harmonic Analysis of Tidal Observations. 171

Table II.
Amherst. Moulmein.
Commence 0 h., August 5. Commence 0 h., April 17.

Year .....| 1880-1. | 1881-2. | 1882-3. ] Mean. || 1880-1. | 1881-2. | 1882-3.] Mean

Q{ a =| 0:064; 0°060| 0°039 | 0:°054 0°043 | 0°054 | 0°039 | 0-045
as 325 341 gee 324 53 55 D3 53

Et =| 0°226| 0:°303 | 0°348 |] 0°292 0:204 | 0°390 | 0:242] 0-279
k= EL2 120 103 m2 134 155 129 139

N H=j| 1°374; 1°248| 1°343] 1:°322 0°735 | 0°672 | 0°630 | 0:679
k= 69 51 51 54 97 106 102 102

re =| 0°393 | 0°280 | 0°226] 0-300 OF1G Ia OF 2490) OSES tit 0 7EZ6
k= 113 65 178 119 152 182 162 165

2 H=] 0:°426; 0°283 |} 0°566} 0°425 0°314 | 0°215 | O:°169 |] 0:°2338
a 186 267 79 ET IOI gl 58 84.

ce =| 0°443 | 0°247 | 0°220] 0:°303 0°308 | 0°314] 0°316] 0-313
elk = 278 299 326 301 272 259 280 270

Ri = : OA ee era ac 0°451 |) .. ORO ara a 0-097
Lk = . PS: 252 . 1@ Ni neeowe 70

T H= 0°841 |... 0-841 O200n eres ae 0-200
k= 144 - 144 KOy, pre IIo

MS ea =| 0°285 | 0°406 | 0°350] 0:°347 0-741 |} O-70L |) 0 6931s Oc 72
a K go 80 76 82 210 209 214 2D

re sO -388-) Ocl50.)' O11 | O-1S1 0-127 | O:137-|, 0-109) §, Ont24

2SM

k= 345 28 16 Io 38 40 gg 38

Mm { = 0°152 | 0:°038 | 0:°095 0°409 | 0°441 | 0:°229 | 0-360
Het = | asle'cne 43 52 48 3 ET 21 I4

Me Be = 0-062 | 0°182 | 0-097 0°282 | 0°379 | 0:°342 | 0:°334
fee — |i sis. cc 315 24 350 42 40 40 4!

Fo) Ee 0-080 | 0:°029}] 0-055 E088.) L097 (Rl 1463) ch ae

Msf

k= 76 66 71 43 48 46 46

Sa4 2 — ieee ae 0°638 | 0°814] 0°726 2°460 | 2°389 | 2:°453 | 2°434
ial Aaa 150 Lge Lake B45 EES ao 149

Sao { Ct = 07188 | 0°124] 0:°156 0°563 | 0°653 | 0:°593 | 0°603
Keg =" |v 0: alahove 139 332 235 283 284 295 287

172 Major A. W. Baird and Prof. G. H. Darwin.

=

Table II.
Port Blair. ‘Fort Point, California.
Commence 0h., April 19. Commence 0 h., October 1.
Year ....| 1880—-1.| 1881-2.| 1882-3.] Mean. || 1858-9. | 1859-60.| 1860-1.] Mean.
g Te 0-028 | 0°018 | 0-016] O-021 O°OLD, | s.ci el Geet 0°015
AT ee 49 25 a1 38 242 | Sve aa ies’ 212
9 i =| 0-966 0°978 | 0:959 | 0-968 0°407 | 0°380 | 0:382 | 0°390
at Sa PS eg 313 315 315 334 336 336 336
9 oa = 0-003 0-001 0°004 | 0-003
Se = 107 86 59 84
9 ey ={ 0:002 | 0-002 0-002 0-002
le = 152 99 142 131
R fr = 0 002 0-002 0-001 0-002
ao 98 88 53 80
M is ae OM Ca 0 °007 0°008 | 0-010 0:034 | 0:087 | 0°044 7, 0:°038
De 23 254 2.38 291 98 273 139 170
M a = 2042 2°014 | 2-010 2-022 1°722 1°659 1°685 1°689
alee: fa VS 296 277 278 2.78 332 333 331 332
M ae = 0-004 0-011 0-007 0-007
Sle S 20 Il 16 16
M a = 0:003 0-011 0-011 0-008 0-066 0:074 0-072 0°071
Fil kes be 167 128 158 151 26 30 15 24
M i = 0-004: 0-002 0-000 0-002
a = 342 206 42 317
M ee = 0-003 0-002 0-002 0-002
ee. oe 19 70 120 70
O ea = 0-153 0°162 0-166 0:160 0°769 0°756 0°814 1 0-780
2 = 299 304 302, 302 89 89 85 87
K ts =| 0°403 | 0°397 | 0-391 | 0-397 || 1°217| 1-209] 1°2382) T-219
ce: a— 326 327 327 327 106 107 107 107
K a = 0-286 0°296 0 -264 0-282 0-139 0-148 0-122 0135
ee 314 308 310 ai 336 328 325 330
ae =| 0:180] 0:137| 0-184] 0-134 || 0-367] 0:366 | 0-387 | 0°373
a= 324 3247 326 326 107 106 104 105
Dee = 0-038 0-030 0:014 0:027 0-072 0-034 0°053 0°053
one B20 324 333 325 130 127 105 121

Year

H
Q1
Lye

K
Nie
K
{a

K

=

Vv

K

H

Hi
Rie
K
BAe
K

MS {
K
asm {
K

Mm |
K
ue {
K
uss { 7
K
Safi
K

Ssa He
K

_ Harmonic Analysis of Tidal Observations.

Port Blair.

Table II.

Commence 0 h., April 19.

ll

NES SIS es Ise Sb te NS eh

| ll

173

Fort Point, California.

Commence 0 h., October 1.

1880-1.| 1881—2.| 1882-3.{ Mean. || 1858-9. |1859-60.| 1860-1.] Mean.

0-028
236

0-059
269

0°413
273

0°035
229

0-148
294

0-094.
288

0°027
24.2

0-098
290

0-392
273

0-023
233

0-046
258

0-391
277

0-047
301

0-079
214

0°074
291

eet nae

170

0 °024.
237

0-068
7

0 °399
274
0 :043
280
0°121
254

0-086
292

0-020
326

0-099
313
0-009
215
0-023
154
0-014
20
0-057

9

0°015
61

0 204:
150

OT E7
177

0-147
78

0-053
300

0-406
305

0°038
2

0°107
288

0-028
2B)

eereee

0-094.
54

0 °123
go

0-064:
335

0°359
305

0-012
326

0-045
35%

0-026
214

0-121
74
0-059
338
0 «374
305
0-026
345
0-064
305
0-029
B04)

0-008
63

0-014
198

0-031
21

174 Major A. W. Baird and Prof. G. H. Darwin,

Table IT.

(a) San Diego. (b) Port Leopold. (c) Beechey Island. (d) Cat
Island. (e) Toulon.

(a) Com. 0 h., Jan. 1. (6) Com. 0 h., Nov. 1, 1848, to July 31, 1849. (ce) Com.
O h., Nov. 2, 1858, to Feb. 28, 1859. (d) Com.0h., Jan. 1. (e) Com. Oh.,

Jan. 1.
(a) (2) (a) (0) (c) (d) (e)

Wear...) e800: 1861. | Mean. || 1848-9. || 1858-9. || 1848. 1853.

——————$ J ————_—,. | | ——____.. | | | | | [| ______

4 i =| 0-030 | 0-025} 0-028 |} 0-031 ||...... || 0-044 || 0-010
1 as |
K 229 246 238 27 ce eee 10 186
R ie =f 0697 || (07693: 40695 0 °643 0 °686 0°068 0-090
ee 2973 Pos 274 29 34 24°} 250
R H =| 0-007 | 0°005 | 0-006 07007 || c< i. eee 0-002
2k = 187 221 204 BIG <P ileeere eyes a0 gx or
iW =
$54 5 Z
H =>
S12
M H =| 0:046 | 0-051] 0-049 0 °045 ‘ 0-007 0°010
Wg = 115 98 106 230 - 26 319
M ae =i oS Lyle ne 7/1 65) 2°001 1°996 0-116 0°190
2 - 2,76 8 11 2
K 275 277 27 33 347 25
M i= "| 0 007 0-007 0-007 ee ee 0 004.
i 17 21 19 oe os : 9
M H ="; 0-028 0:027 | 0-028 0°015 0 °024 0:O11
le = 205 200 203 11 202 268 349
M By 41) O00 74 Or OLS yO FOI a oie = | iveionete vole nell renee 0 °002
Sle = 88 80 84. SMe ball tiie eietons satan ae 152
JE ate BG a ere: | ocecia mack (| Margera te 345 0‘001
M,{ | = eve | eceveace ee eeeecos e 146
O =") 40694) |) 0698") (0-696 0 °443 0-488 0 °479 0°059
kK = EI 78 78 164 162 315 302
K ae =| 1:097 | 1:095.]) 1°096 ||, 0-899 || 0-901 || O-b25q)ie@itene
pce 94. 95 94 216 243 325 3
K i =| 0°210 | 0°2038 0-207 0°175 0°151 0-028 0-024
a 260 267 263 29 54 288 254
P Hiv — |) 0-352 0-361 0 °357 0-216 0°215 0°156 0°041
kK = gi go eX) 218 222 Bai °
{8 =| 0:°068 | O°100] 0:084 0°035 0-008
k= 96 103 99 oe 297 15

Harmonic Analysis of Tidal Observations. Via

Table IT.
(a) San Diego. (b) Port Leopold. (¢) Beechey Island. (d) Cat
Island. (e) Toulon.

(2) Com.0h., Jan.1. (6) Com. Oh., Nov. 1, 1848, to July 31, 1849. (c) Com.
Oh., Nov. 2, 1858, to Feb. 28, 1859. (d) Com. Oh., Jan. 1. (e) Com. Oh,
Jan. 1.

() (2) (2) (2) (c) (d) (¢)

Meatiead..| 860. 1861. | Mean. |] 1848-9. || 1858-9. || 1848. 1853.
Olan Ors Z OR emOrs GO Oa i) Srelare.c) | lence eat 0-091 |} 0-006
kK = 73 Hig 75 aeccee || se cee 307 242
Ra =] 0°033 | 0-005] 0-019 0-044 0 :080 0:012 || 0-007
k= 0 328 344 3 47 33 224,
N H=] 0-415 | 0°440] 0-428 0420 0 -4:29 0°026 0 :046
= 2,58 261 260 306 315 33 24.0
r ie 0:069 0 :049 0°059 eecece eeeceece ce oecoe 0-003
t= 179 268 224 se ceee moonsa: Mil coon ae 10
vy ra 0°134 0:070 0-102 e©e@eeocee oe e@G@ oe eeeeee 0-008
kK => 261 233 247 eeooese eeoveove || eeeece 219
eae OLOSIs Os Olome OF O27 We nseet |inecta tle || oe anes 0007
i kK = 244 235 240 ce reee ceccoe || coves 219
He or oe 0°010 | 0O:010 ||
kK = eeceece 153 153
ue =| ceded 0°041 | 0:°041
Odiu—adl sheyore! 6 319 319
i O O06 0°012 0-009
MS 1; = 138 Ig1 189
asm {2 =
K =
M te = ee eeece ee eee eecceee || eeeeee || ee eee e 0-094 0°061
m
i = | So do 04 oo aca so0a00 Ill bon000 seco ee 304. 228
i ae oe eeer | ee eee oe 00 oF oe eee eevee ee 0-069 0 °045
HEM a= || os ehra eve eM lle ere ere) fl «.s o.ee's Bcd Hohe oodo bc 134 118
use { = coogoO 00 JPoocoaads Hh 00 0.0.6 eeoe gr 0:095 0:°018
HOt saieh \Metepisele: |) 's@ «/0) «5% lle enemies: sees 336 53
ee cove oo Tl coco oon | Mae opeaee |||Ne'o is ode Pai oteiets 0 °274 0-157
Ke eeeece | ce evece eeceaoe |} eceecvee ec ee ee 145 279
R ae nie etnies 6 CE CIA iee| AAS Crreremalll eS chs Gude alle Coeyiel Ges 0°128 0 090
8a
Ke ee ee eecavce fF ce esee || saveve ee rece 35 144

176 Major A. W. Baird and Prof. G. H. Darwin. |

Table IL.

(a) Brest. (b) Ramsgate. (c) West Hartlepool.
(a) Com. Oh., Jan. 1. (6) Com. 0 h., Jan. 1. (c) Com. 0 h., July 1.
N.B.—English ports referred to G.M.T.

(2) (0) (c) (c) (1)
Near j..% eal), L875; 1864. 1858-9. | 1859-60. | 1860-1. Mean.
9 Oe dl OO 0-037 0-019 0-054 0°025 0°03838
Se Lise = 52 313 132 157 169 152
g Hs Broo. 1°877 1°754 ira Li 1-749 1-738
ica 138 33 141 138 138 139
9 ee == | Teta le coat 0°632 0-025 0°021 0°019 0°022
SoC ape lay 4 190 174 172 179
S ich |e aleie <elraie 0 :027
6 if = e ZAG)
jes
S54 5 ©
M i i Oe OOAy OH iret tee 0°028 0-030 0-019 0°026
De a= 167 ere 39 125 147 104
M a =| en T Ob 6 144 5°176 5 148 5166 5 ‘163
2h: ——vioS 341 99 99 97 98
M ie the) Oy, 0 °043 0:038 0 °023 0 046 * 0°0386
aie 2 56 122 105 127 118
M es OtiGs 0°548 0°080 0 °106 0 -099 0-095
Vp = Sanu: 2.43 103 117 107 109
M E470 106 0-164: 0:071 0°078 0°073 0:074
Sle =] 325 127 50 55 46 50
He =), 0-008 0-054
Me1 =| 203 54
O a Oar: 0-342 0°433 0°425 0° 444 0°434
kK = 322 180 84 86 85 85
K H =| 0-208 0 °223 0-390 0 °365 0-385 0 *380
te 66 18 247 247 248 248
K Ho =} 07553 0-520 0 485 O'511 0.‘467 0 °488
7k =P 144 24 139 136 132 135
ae = Oil 0:073 0°121 0-120 0-095 0°112
a= 59 353 232 232 2.32 232

Harmonic Analysis of Tidal Observations. 177

Table ITI.

(a) Brest. (b) Ramsgate. (c) West Hartlepool.
(2) Com. 0h., Jan. 1. (4) Com. 0 h., Jan. 1. (c) Com. 0h., July 1.
N.B.—English ports referred to G.M.T.

(2) (2) (¢) (c) (c) (¢)
WEAR) oh. orc. 1875. 1864. 1858-9. | 1859-60. | 1860-1. Mean.
og fH a] ve i cedsn || OpI40r.. O43 160 0-148
SE etecee soocac 41 31 25 32
T ist == 1) OS 4 0 447 0-169 0-179 0 °253 0-200
kK = 101 16 106 140 94 114
N ea) Line 1°084, 0:951 0:973 1 :040 0 988
es 83 312 77 70 72 73
x Eat (O:059 0-174 0°057 0-110 OSL 0-095
k= 59 351 148 85 TLS 116
. ea SO5293 0-344. 0-115 0 325 0°369 0 °270
a 45 330 75 116 73 88
i OF307 0°251 0-097 0-100 0-057 0-085
le 92 87 9 346 24 6
R JED et iN ge a er ee dor 0-008 0-008
FMB Wimiel sericrete) lls aksieqere. || | d'eiwe wis) | slap vickn.s 158 158
T H = 1 On eOes OH ° (0) "140 0) 140
k= 200 2,00
MS (she 0°324 0-047 0-040 0°046 0-044
c= ° D7 p22 142 115 126
He Sle aah aes. Sic 0°141 0-034 0-034 0-009 0 026
2SM
= | Crees 262 Bs 29 2,26 310
M te = (Bis) 0-029 0°085 0°148 0-147 0°127
m
i = 328 45 24 176 79 93
Me E71 OF069 0-044, 0-037 0°040 0-060 0-046
—— 76 288 2,00 2B 178 205
Ee — |) 07290 0 °094 0°135 0°134 0-143 0°137
MSf
= 52 206 70 56 53 59
Sa{ 0 ==) \Or26h 0°127 0°217 0-366 0°2138 0° 265
k= 234 181 258 200 200 219
R a =+} OrO7L 0-075 0° 004: 0-138 0-149 0-097
sa
k= 93 288 275 106 287 22

VOL. XXXIX. N

178 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
Portland Breakwater.

Conimence 0 h., January 1.

N.B.—Referred to G.M.T.

WVGAT <jointees 1851. 1857. 1866. 1870.
9 13 — 0-074 0-031 0-026 0-015
{tk = 84 98 gI 83
9 1. = 1-076 1-076 1-090 1-055
21a = 2.43 247 2.4.5 241
9 isl = 0°012 0-010 0-016 0°010
ec = 193 185 168 196

H =
B04, 2
He
$54 i
M i — 0:O011 0°004 0:030 0°013
lle = 317 184 278 32
M H = 2-109 2°104 1 Ho tb 2-067
aie = 193 197 195 192
M leh = 0°029 0 °045 0-045 0 026
Se 172 195 188 166
M jel = 0°440 0°535 0 °439 0 °456
ee 29 42 31 29
M ie 0°211 0°217 0°195 0 °203
uM i 0°0138 0°017 0°009 0-009
gellie: = 54 46 40 57
Oe = 0°165 0°162 0°156 0°168
Sas a 351 357 351 353
K i= 0°283 0-292 0° 295 0°308
le = re 116 114 114
K ‘fs = 0°312 0: 292 0°316 0°282
ae = 238 243 234 236
P A = 0°096 0°118 0°108 0-108
kK = III 108 105 108
7 eal

Weare sc.

Harmonic Analysis of Tidal Observations.

Table IT.
Portland Breakwater.

‘Commence 0 h., J anuary 1.

N.B.—Referred to G.M.T.

1851. Ueagee 1866. 1870.
0 +227 0-105 0-142 0208
144 98 109 95
0 °465 0-462 0:499 0-483
134 186 186 184
0-103 0-058 0-080 0-089
II3 109 134 EEZ
0-093 0-125 Osi 0-121
196 11g 109 135
OST lt) (Orson 0-350 0 367
197 199 193 193
0-261 0276 0-253 0:279
86 94 90 gI
0-050 0-072 0-062 0-050
351 6 348 346

Mean.

0°267
gO

0°059
353

179

180 Major A. W. Baird and Prof. G. H. Darwin.
Table IT.
Inverpool.
Commence 0 h., September 1.
N.B.—Referreé to G.M.T.
Year 1857-8 1858-9. 1859-60. Mean.
g { = 0: 045 0°070 0°084. 0° 066
1 saa
= 70 60 57 62
g = 3°215 3°312 3°194: 3° 240
4 = 12, “II 10 II
9 { = 0°061 0-060 0°048 0° 056
TE 322 330 295 316
S64 at
Be
M { = 0°015 0°042 0°004: 0°020
4) 1 i
. = 303 314 159 258
= 10°033 10°136 10-130 10°100
M,

B = 327 327 326 326
M { = Orr 0°103 0°159 0°124
? = 331 317 324 324
M { = 0°737 0°700 0°668 0-702
i = 221 220 2.25 222
M { = 0: 202 0-208 0° 224 0-211
: = 344 352 348 348
M { — 0:067 0-092 0-073 0°077
8 = 264 283 266 2471
of = 0 374 0-356 0-400 0°377

= 45 42 42 43
K { — 0°354 0 °362 0°357 0-358
es 195 197 189 194
K. = 0:904: 1°001 0°912 0°939
. az 9 9 3 7
P{ = 0°125 0°134 0°131 0°130
= 192 196 189 192

ql

Harmonic Analysis of Tidal Observations.

Table II.
Inverpool.
Commence 0 h., September 1.

N.B—Referred to G.M.T.

1857-8. 1858-9. 1859-60.

0:408 0°'681 0°530
330 4 342
1°930 1°819 2°019
304. 310 306
0° 424 0° 233 0°120
B22 316 13
0-769 0°651 0°291
308 285 263
0-308 0° 241 0°323
33 4.4 36
Shetisheret cso 0:101 0-082
aa) lo|ie«! wife 46 46
0°349 0°121
So Ge don 6 348 a7)
0°454 0°361 0°397
ATM 267 Ye
0°140 0°165 O°151
2,06 216 228
0°053 0° 223 0°166
289 32 173
0-064 0°027 0:018
175 159 89
0:071 0:021 0°081
III 324 302
0-359 0° 284 0°353
210 259 213
0°090 0°104 0°190
144 2,70 112

Mean.

181

182 Major A. W. Baird and Prof. G. H. Darwin.

Table IT:
Liverpool.
Commence 0 h., January 23,
N.B—Referred to G.M.T.

Wear...) 4866-7, 1867-8. 1868-9. 1869-70.
0-047 0-035 0-040 0-028
39 66 IOI 124.

3 °130 3 099 3 °122 3 °052
12 II 12, 14
0 :048 0-068 0-064 0-051
314 327 298 5238S
0-035 0-023 0:049 0-048
304 261 19 39
9 “901 9 ‘906 9°807 9°911
326 326 327 328
0-081 0-097 0°111 0-098
336 327 323 311
O- Fil 0-673 0°659 0-688
225 222 221 225
0°184 0°174 0°172 0:205
344 347 350 358
0-058 0-058 0°059 0:070
283 279 291 287
0°379 0°331 0°398 0°357
+t 41 39 36
0°372 0°332 0°344. 0°362
192 197 194 196
0° 846 1°021 0°935 0°933
19 9 3 7
0-141 0°136 0°133 0: 094.
178 199 174 167

- Harmonie Analysis of Tidal Observations. 183

Table IT.
Inverpool.

Commence 0 h., January 23.

N.B.— Referred to G.M.T.

1866-7. 1867-8. 1868-9. 1869-70. - Mean.
0-550 0:491 0°476 0°565 0°521
296 331 347 Bui 328
2-083 1°845 1:°774 1°848 1-888
302 308 306 303 305
0: 228 0-209 0:192 0:187 0-204
356 fo) By) 310 336
0-692 0:487 0'138 0°675 0°498
279 267 310 331 297
0-238 0:212 0: 242 0-220 0: 228
33 31 62 36 41
0° 447 0:°400 0°395 0:387 0: 407
270 271 268 271 270
0-134 0-112 | 0-136 0-118 0-125
222 225 225 235 227
0-064 bake ad MS a4 ee oe 0-064
POG Mie Wal iia! .ockes iG Re ao ROR Ru 260
CAOS 1m elton, & ahs) coe livaxees Renew ee coteesed 0 :°057
344 Odi sie ere eed eiencnsiietct es Seallerat ahasave 344.
0-051 hao ee Sh Sa I ee 0-051
68 aaa alee eee Se aii ete 68
0-452 eeeeenede eeoaeevees eocoeeo eee 0 °452
272 elelaia\ eis, ate dba eras a bee maint 6) diet eke 272
0-185 ee@eeoeeeese#e Oe 1079) ever e.@ sie ~ 8) 6, ee oe 0°185
229 eessoeese#ée# eeo0e@P@eee@ eoeeveeeesd 229

184 Major A. W. Baird and Prof. G. H. Darwin.

Table IT.
Helbre Island.

Commence 0 h., January 1.

N.B.— Referred to G.M.T.

Wear es. o% 1858. 1859. 1860. 1861. 1862. 1863.
ropes
O41; ©
g ic = 3138 3°177 3 °163 3°171 3119 3°120
i 2 3 2 3 3 3
R hs = "| (0:033 0°033 0-026 0°030 0-026 0-025
ae = 222 329 298 332 317 300
os
S64 =
H =
S34 ne
M H =| 0-008 0-043 0-036 0-023 0-080 0-013
Le = 289 8 108 60 125 267
M ea =F). OS 765 9-763 9-929 9°828 9-740 9-709
ec 319 320 319 318 320 320
M ie ay OE TOA, 0-091 0-106 0°140 0:079 0:117
Sg” == 304 288 307 278 283 279
M H =| 0-446 0-441 0°491 0°479 0-409 0-500
ao 216 219 214 210 218 213
ut jit =| 0-065 | 0-063 | 0-081 | 0-066 | 0-065 0-066
3 = 29 51 25 21 28 36
M 1e = 0-013 0-007 0:012 0-013 0-011 0-013
SUS er ae 51 339 6 309 13
Ole = | OPuay 0 *368 0°361 0-404 0-379 0-377
k= 41 42 42 42, | 5 ee 40
K ey =| 0°387 0°376 0°376 0-404: 0-387 0-388
ae 192 187 186 188 188 189
K ie a OO 22 0 °883 0-919 0-916 0-928 0-989
Gale. aos 355 354 I 354 5
Ba a) wali 0-147 0°131 0°131 0 162 0-188
kK = 184 180 190 99 176 194

Harmonie Analysis of Tidal Observations.

Table II.
Helbre Island.

Commence 0 h., January 1.
N.B.—Referred to G.M.T.

185

1858 1859. 1860. 1861. 1862.
0-108 0-099
359 334
0:370 0:561 | 0-477 | 0-424 0:215
334 354 336 | 324 256
1°855 1-896 1-794 | 1-888 1-847
296 292 291 : 295 297
0-144 | 0-204 | 0-058 | 0-202 | 0-255
327 293 14 | 353 357
0-189 0°321 0-221 | 0-626 0-371
268 | 274 336 277 210
0-033 0-176 0-076 | 0°145 0-026
80 44 30 32 345
‘ 0-022 0-102
18 291
0-222 : | 0:406
| 311 =< 6
|
| 0-206 | 0-261 | 0-310 | 0-257
| 265 272 267 277
0-132 | 0-122 0-123 0-126 0-126
217 230 237 208 216

186 Major A. W. Baird and Prof. G. H. Darwin.

Table II.
Helbre Island.

Commence 0 h., January 1.

N.B.— Referred to G.M.T

Wear 45,48; 1864. 1865. 1866. 1867. Mean.
H =
oH
9 ae = 3 °089 3 °093 3 °106 3°108 3 °128
ale = 3 3 I 2 3
A (2 =| 0:035 0-029 0-080 0-034 0-030
4le = 309 303 304 302 312
H =
as
Et =
$64) E
M ie = 0 *002 0°034: 0°044. 0 046 0°033
ie = 166 256 336 284 : 262
M es = 9-728 9 762 9°708 9 645 9°758
2K = 321 320 319 319 319
M bs = 0°104 0°077 0°107 0°110 0 °104
Le = 305 285 310 293 293
M ge = 0°515 0-510 0-508 — 0°494 0°479
ol 213 211 209 211 213
M be = 0:078 0-069 0-079 0°072 0:070
lke = 44 4.2 all, 28 34
M EL O01 0 009 0-009 0-005 0°010
8 =| 8 8
Ke 18 34 307 33 352
O ee = 0341 0 386 0°363 0-350 0-370
BS 37 4l 40 Bo ng 41
K jal = 0-388 0-416 0-419 0°370 0-391
Vn = 189 189 185 187 188
K. i = 0 °738 0-919 0°918 0-770 0:890
FU 0 4 351 357 358
Ba = 0°1384 0-153 0-160 0°134 0-146
ic 176 179 179 183 174
aos eoee 80 eaeece 0:018 0 :04.4. 0 ‘026
lis ee Se cece eianayaher: 342 98 122

Mean os eas

af?
be
K
Bs
K
sa
K
ie

V
K
H
Li
R{e
K
ote
K
us {tt
K
asm {i
kK
Mm { 4
K
ue { 2
K
use {
K
sa{
K

Sea |
K

|p N= aes es ee ree |

Me set I te IE Th

I Il

| ll

lll

Harmonie Analysis of Tidal Observations. 187

Table IT.
Helbre Island.
Commence 0 h., January 1.

N.B.— Referred to G.M.T.

1864. 1865. 1866. 1867. Mean.
Pevaieie : exetenars 0°121 0-122 0 ‘118
RYane veers 6 COLOG 339 350 345

0 °506 0 °554 0°390 0: 466 0 °428

356 342 317 341 331

1°923 1 °852 1 °824 1°849 1°857

2.96 295 298 297 295

0°275 0 °263 0 °254 0:106 0°194

334 343 343 290 334

0-666 0°683 0 °522 0°173 0-438

289 295 263 291 278
0-061 0°095 0-012 0°151 0:0838

Il 43 331 66 34
Btheien as 0-050 Seva 0-026 0°050
Siow BAAR Po IBol es envanre 63 359
doodao 0 °230 FoI 0°158 0 254
Sraee tere 356 sieteis ere pata] 327

0°314 0-322 0°290 0-292 0-280

2,66 264. 261 2,60 267

0:094. 0°124 0-104 0-112 ORS

pai 2 210 221 230 221

188 Major A. W, Baird and Prof. G. H. Darwin.

Table ITI.

1, Aden. 2, Karachi. 3, Okha. 4, Kathiwadar. 5, Bombay.
6, Karwar. 7, Beypore.

1 2 3 +: 5 6 Ze

Years. 1879-83.| 1868-83.| 1874-5. | 1881-2. | 1878-82.| 1878-83.| 1878-83.

——_— se ————_ ee eae

No. of years
observed ... 4, 15 1 if 5 5 5
9 te =| 07090 | 0°082 | 0:074| 0:°184} O°078 | O'057 (ReGen
Ue = 162 158 150 201 182 159 174
9 te =H) 0-597 | 10-948, 158-222 1°207 | 1:622 |} 0°624 | 0-330
He = 248 322 14 81 3 335 18
9 te =| 0:006| 0°010; 0:018 0:029 | 0°012} 0:°010 |} 0-005
yea S= 271 14 117 253 256 100 137
g ig = 0:004 | 0°007 0-003 0°013 0-003 0:005 | 0:005
Cc 201 295 2a 42 171 52 247
g ie = 0:001 0-001 0°001 0-002 0-001 0°002 | 0:001
Ne = 259 204 220 264 115 304 339
M te =| 0:047| 0:°044 |] 0°051 0°057 | 0°051 |} 0:°033 | 0:°029
mE Os 21 30 43 35 49 4i 73
M bs =| 1°568| 2°504) 3°820| 2:970| 4:084| 1°742 | 0°9381
Sai a= 8l (ze 294 347 55 330 302 329
M i =| 0-018 0°039 0-030 0:020 | 0°065 0°014 | 0-010
ic 209 330 2 152 28 273 197
M ee = (ORC 07 0°024 | 0:°186 0:220 |} 0:°124 | 0:°055 0-020
a 314 14 107 178 322 17 41
M i =F) (O-005 0°049 0-007 0-139 0°O11 0-011 0-007
to — 341 210 270 137 III 284 138
M EF} 0003 0-005 0:011 0-002 0-004 | 0-002 0-008
Silke = 43 267 96 199 35a 109 146
One =| 0°653 | 0°647|] 0°693 | 0-720} 0°650|] 0°497 | 0-340
A 38 47 57 66 48 49 57
K Ve = 1239 1281 1°414 | 1:°611 1-393 1004 | 0°704
Ete 36 46 53 66 45 45 52
K le — sO e201 0°278 0°328 | 0:°324 | 0°410}] 0:°174 | 0-°080
ql ==) eae 320 17 79 352 330 II
ag = | 0:°388 0-380 0°384 | 0°436 0-402 0°277 O>19L
aS 33 46 50 71 42 42 53
{2 iO Os 0:079 OSI ROFL 75 0:089 | 0-068 0 °044
2 = 52 70 81 107 72 57 63

1, Aden. 2, Karachi.

Years.

—_—

No. of years

Ota
Ling
K
me
K
me
K
a

Vv
K
H
#1)
R{e
K
ee
K
us {
K
2M | 1
K
Mm4 i
K
ut {
K
Mst{
K
Sa{ 0

Sea {
Kt

observed...

(PaaS SS et I ll elles tell

Harmonic Analysis of Tidal Observations. 189

1

1879-83.| 1868-83.| 1874-5. | 1881-2. | 1878-82.

2

0°129
52

0°081
299

0 :600
277

0-042
282

0°142
277

0-061
2.63

0 -°030
2,76

0-068 |

332
0°027
307
0:°021
123
0 060
95

0 °033
316

0 :036
266
0°138
79
0°135
142

3,
6, Karwar. 7, Beypore.

Table III.

Okha.

"3

eoeceove

4, Kathiwadar.

4,

0°152
68

0:079
261

(0°755
34

0°043
107

07131
15

0-286
343

eoeoee

5

0°131
52
0°108
316
1-003
314
0-032
235
0-199
35
0-206
308
0 °042
233
O°171
am
0°129
a4
0 °036
106
0 °056
26
0:°051
346
0°031
228
0°186
358

0°122
228

5, Bombay.

6 7

1878-83.| 1878-83.

5 5
0:114 | 0:081
59 66
0:056 | 0:027
317 348
0°410 | 0-197
282 305
0°:020 | O-'Ol11
273 B29
0:088 | 0:°055
294 gin
0°044 | 0-019
2,63 258
0:008 | 0:°023
145 132
0:061 | 0-040
155 19
0°026 | 0-009
67 77
0:007 | 0-005
315 296
0°065 | 0-091
27 32
0:°042 | 0-071

5 23
0°022 | 0:0388
164 216
0°352 | 0°309
59) gee)
0:068 | 0-177

190 Major A. W. Baird and Prof. G. H. Darwin.

Table IIT.

8, Paumben. 9, Negapatam. 10. Madras. 11. Vizagapatam,
12. False Point. 18. Dublat. 14. Diamond Harbour.

8 9 10 11 12 13 14

Years. 1878-82.| 1881-3. | 1880-3. | 1879-83.) 1881-3. | I881-3.} 1881-3.

pf |

No. of years
observed ... 4 2 3 L 2 2 2
R H =] 0:036| 0°046 | 0°025] 0°052 | 0°015 | 0-047 | 0-085
lle = 148 108 92 68 6 110 152
R H =| 0:°372 | 0°274 | 0°441) 0-656 | 1:018 | 2°108| 2-252
2k = 92 284 276 285 303 327 26
9 H =| 0:003 | 0:°005 | 0°002}] 0:005 | 0°008!/ 0-018} 0-120
4)n = 261 ISI 161 47 329 2a5 326
9 H =| 0:004|) 0:000}] 0:001} 0°001 | 0°003 | 0:004; O-U18
Ber = 197 150 112 170 169 99 251
g H =] 0:003 ; 0:001 | 0:°001 | 0°002} 0:°003 } 0:°006 | 0-003
Se 224 227 162, 79 240 113 353
M ie =] 0-011} 0:005; 0-008; 0:°012| 0°009 | 05005))>0:-020
a 35 III 7 295 30 41 95
M H =} 0:'585 | 0:°720| 1°049 | 1°473 | 2°250) 4°610) 5:177
2k = 47 252 2.48 253 270 290 344
M H =| 0-016} 0:003 | 0°004} 0:°006 | 0°014| 0°046 |} 0-035
{i = 170 103 62 329 30 133 223
M H =| 0-016} 0-021 | 0:°003 |} 0°015 | 0°038 | 0°095 | 0°745
4\n = 194 77 146 331 230 144 246
M H =| 0O°011} 0°012 | 0-010] 0:005} 0-010 | 0-014] 0-152
te - 42 128 154 72 63 255 106
M VE =| 0°005 | 0:005 | 0-002 | 0:003 | 0:°003 | 07012 | 0-062
Sle =} 314 303 46 209 246 294 345
Ole =] 0°115 | 0°091 | 0-097 | 0-141" 0-177 | - O- 1899) Pees
k= 45 322 325 331 335 334 345
K Ve =| 0°294 |} 0°225 | 0°298 | 0°359 | 0°408 | 0°493 | 0-496
ee 46 345 340 342 345 352 =
K H =| 07113 | 0-077 | 0:°112 |} 0°203'| 0-255 | 0-596") OsGa6
AE = 90 286 280 277 297 318 23
Bye: =} 0:110| 0:084| 0-097 | 0°096 | 0°145) 0°155 | 0-175
k= 46 346 344 339 344 343 9
J H=}~'0:014-;° 0-011 | -0-021-7- 0-025 _|---0-026°>|--0 024-4" Osis
ae — 48 328 318 837 312 324 320

8, Paumben.

Harmonic Analysis of Tidal Observations.

8

9, Negapatam.
12, False Point. 13, Dublat. 14, Diamond Harbour.

9

Table IIT.

10

10, Madras.

EE

12

13

191

11, Vizagapatam.

14.

Years.

No. of years

observed...

H
Qt;
Lie

K
gla
K
fe
K
a

Vv
K
H
els
R{e
K
eg
K
us {2
K
2M |
K
Mnf
K
ue {i
K
ust {
K
Saft
K

Ssa{ 2
K

(Vee ese | eer et [ee9 ell al

ll ll

Ii ott

ll

I ll

1878-82.) 1881-8.

1880-3. | 1879-83.

0 °332
114

1881-3. | 1881-3. | 1881-3.

2

0-011
324
0-059
254
0:476
267
0-068
180
0°142
244
0:075
273
0-034:
27
0:017
T49
0:041
2754
0:01L7
187
0:063
55
0-067
35
0-050
356

0:793
166

0° 287
146

2
0-009
333

0-167
291

0-947
236

0°219
316

0 °232
251
0°165
Lb
0°219
289
0°137
Zo9
0°077
UBS
0-072
Zur

0-040
77

0°048
66

0-063
356

0° 900
150

0°208
136

2

0-030

192 Major A. W. Baird and Prof. G. H. Darwin.

Table ITI.

15, Kidderpore. 16, Hlephant Point. 17, Rangoon. 18, Amherst.
19, Moulmein. 20, Port Blair. 21, Fort Point.

15 16 iby 18 a 20 21
Years. 1881-3. |} 1880-1.| 1880-38.) 1880-8. | 1880-3.| 1880-8. | 1858-61.
No. of years
observed ... 2 if 3 3 3 3 3
9 a a Ooi 0°113 0°1138 0 °222 0-096 0°021 0°015
“Le =| 193 79 133 141 149 38 212
9 ee = 1 °468 2 °337 2°012 2°769 1°362 0°968 0-390
ia Iol 143 170 105 148 315 336
R a = 0°075 0 °037 0-081 0-106 0-067 0-003
illo. rs I1g 162 259 122 229 84
R (Eis) 70005 0-021 0-010 0°012 0-005 0-002
6 =
Le 299 94 48 187 183 131
g i 0-008 0-008 0-005 0-008 0-002 0-002
ve 311 60 120 2,76 211 80
M Le 0 SHO: Oaks 0019 0°033 0-032 0°018 0-010 0-038
1
k= 157 88 183 255 1338 291 170
M lal = 3 °627 5 °870 5 545 6-233 3-779 2 °022 1°689
a 58 103 031 69 113 278 332
M oS 0-015 0-025 0-021 0:019 0-025 0-007
3 =
iq = Bet 146 178 261 2,09 16
M Et = On72 0-079 0-410 0°350 | O°901 0 008 0-071
“We = 37 46 169 51 iyi IBE 24
M al = 0-159 0-205 0 233 0-118 0 °102 0-002
De ss 319 349 87 252 200 317
M she =| 0 5078 0°031 0-081 0°014 | 0:0388 0-002
Sle = 270 322 97 249 133 7°
i
O 15h == | 0-220 0-349 0:294 | 0°317 0-253 0°160 | 0-780
K Et ail 356 28 339 48 302 87
|
K Es — | PO paao 0-807 0-670 0-699 0°438 0-397 L219
1
a= 56 18 35 5 40 327 107
K H =| 0:°485 0°401 0°570 1°104 | 0°336 0 °282 0°135
“le = 96 gi 169 ie) ae 30% 330
Bre =! 0°144; 0-199 0°149 | 0:177 0°134 |} 0°134 | 0°373
es 47 33 55 337 60 326 105
7 jel eu ly OrOeh ye OTe 0:030 | 0:074 0-022 0 027 0-053
kK = ri 61 33 34 | 107 3.25 Iz!

Harmonie Analysis of Tidal Observations.

15, Kedderpore. 16, Hlephant Point.

Table ILI.

17, Rangoon.

19, Moulmein. 20, Port Blarr,

a
& K

ll
Mm
co
i)
1S)

“I
\o

R{e = 0-167 eoee ee
for OS 77
7 H = 0°147
k= 107
k= 81 67
k= 2 84
Mm { — 0°244. 0°145
k= 351 6
Me} a = 0-297 0:°098
k= 38 310
Te a) 273
Saf = 2°740 0-930
k= 157 146
Sea {1 = 0 *822 0°261
k= 269 198

VOL. XXXIX,

Lz

18

19

193

18, Amherst.

21, Fort Povnt.

20

21

1880-3.} 1880-3. | 1880—3.| 1880-8. | 1858-61.

15 16
Years. 1881-3.} 1880-1.
No. of years
observed... 2 1
aie = 0°0389 0°042
9 336
i a 0°187 0-346
ae 74 109
seg = 0-638 1-543
k= 47 80
r = 0°101 0°659
a 107 145
ae = 0°238 0-681
| 383 209

0-208
34
0-554
497
1°486
150
0-126
328

0-097
DSS)
0 055
ay
0-726
140
0-156

235

3

2,87

3

SE eEEei eee

3

194 Major A. W. Baird and Prof. G. H. Darwin.

Table ITT.

22, San Diego. 23, Port Leopold. 24, Beechey Island. 25, Cat Island,
Gulf of Mexico. 26, Toulon. 27, Brest. 28, Ramsgate (referred to
G.M.T.).

22 23 24, 25 26 27 28
Years. 1860-1. | 1848-9.| 1858-9.) 1848. 1853. 1875. | 1864.
No. of years
observed ... 2 eral. 1 1 if 1 1
9 =F) sO O28 GO PORT a ae im 0:044 | 0°010 | 0:015 | 0:037
lle = 238 29 Ste Sat ite) 186 52 218
9 Le =| 0°695 | 0°643 | 0-686 | 0°068 | 0°090 | 2°551 | 1°877
2k = 274, 29 34 24 250 138 33
g H =| 102006 | FO 7007} %. 2% ie ny 5 0 *002)) Seen 0°032
Ake — eon 257 Nera eB ee ee 298 os ee lois 4
g aa ee ioe Al Sete elo ee she: simi Gis cate foe ee 0-027
6)e = = e ove 27
Hie
Se
M H =| 0°049| 0°045 | ...... 0-007 | 0-010 | 0:004
le = 106 2 Olu als eyelet 26 319 167
M H =] 1:715 | 27001} 1:996'|: O-116.| 0-190.) 6 *7obRap Gates
2\n = 276 338 347 II 252 100 341
u A 1 AO FOOTE aie ete ee | Mies fore tte | Reena 0°004| 0°067 | 0:043
a)K = 19 B eliaia (eS ll Me atotetln oe vene 9 2 56
M | 0 2028) 0 s01b 5) 00240 ae. eee 0-011 | 0°169} 0-548
we = 2.03 202 2 OO Tala tetatces 349 SH ih P1243
M We | O01) cock Pee cece | cece we | O7002)) VO MURR aaa:
me es 84 45 152 325 iy
Py SOR ee eRe 0-001 | 0-008 | 0-054
M,{ = 146
kK = 4 203 54
O H =! 0-696} 0:443 | 0°488 | 0°479 | 0°059 | 0-211 | 0°342
ie = 48 164 162 315 302 322 180
K H =| 17096 || 0°899:| 0-901 |) 08525 | 0-116 | O-208N Or 2ze
4g = 94 216 243 325 3 66 18
K H =| 0°207 | O:°175 | O°151; 0°028 | 0°024!] 0°553 | 0-520
ae = 263 29 54 2.88 254 144 24
H =| 0357 |. 0°216 | 0-215 |. 07156 | 0-041 |, 0-071) ORGre
P4t = 90 218 2212, 321 fe) 59 353
J H =| 0-084 we 0°035 | 0-008
{i = 99 | eeaeee e 297 I5

Harmone Analysis of Tidal Observations.

Table ITI.
22, San Diego. 23, Port Leopold. 24, Beechey Island. 25, Cat Island,

26

1853.

0-090

Gulf of Mexico. 26, Toulon. 27, Brest.
G.M.T.).
” 22 23 24 25
Years. 1860-1. | 1848-9. | 1858-9.| 1848.
No. of years
observed ... 2 I! 1 Al
Q ie =) | UIE aE ae 0-091
ec = TiN tre echelons 307
ee 0-019 0 °044. 0-080 0-012
c= 344 3 47 33
ae =| 0°428|} 0°420| 0°429/ 0-026
k= 260 306 315 25
afar AAO Oa [is ch siete) Hilo, a) (aes) auahiayay' es
k= ZAR DIEM. & 5a 2c
| aaa Die hOQe ie ates
"le = DCM Ie: eat tras dee? Miserable
vs = 0-027
Oe = 2/56) A I eee deal aes Rea is I
Ba ek 0-010
apes 53
oft =| 0-041
Pe 319
Ms ie =a eg LOOM [ale aie ieyited S| aicton ates
ie Beal toca rate ares Whiccieh starrer a ae eee
asm { H =| eb coot |igeeheonll aeme on es
Kenan op aeaie Fatt arcisieperse (hy «chareuetes Racha deans
Mm {2 Sl cece “uhioge Seen bee Gone 0-094
Kk = APN BE oon ole - 304
urs H Sills Oreo apll ioe CoML aCe 0-069
LK = e [| eeeceee 134
use { = lee Be Sc edlkee Cee meee cide 0 °095
Keefe fayo'eya es | | eelieel 8 « 336
Safi = Shspeieves ol) \e-dl-ake; eve 0°274
ie Micertersin | ail ereee. |e heats 145
$a 4 i x 0°128
FONE ocak elas 5 35

195

27 28
1875. 1864.
1 1
0-192 | 0°447
IOI 16
1 ‘375 1 084
83 a2
6°059 | 0:°174
59 35
0 °2938 0344
45 339
0-307 | 0:°251
g2 87

0-324
Be Picken neg)
0°141
Soagee 262
0-038 | 0:029
328 45
0°069 | 0°044
76 288
0°290 | 0-094
52 206
@{ 261). O27
234 181
0:071 | 0:075
93 288

28, Ramsgate (referred to

196 Major A. W. Baird and Prof. G. H. Darwin.

Table ITI. 2

29, West Hartlepool. 30, Portland Breakwater. 31, Liverpool.
32, Liverpool. 33, Helbre Island. 34, Freemantle, West Australia.
30, Mauritius, Port Louis.

N.B.— English ports referred to G.M.T.

29 30 31 32 33 384 35
. 1851, 57,| 4or" ig
Years. 1858-61, Ge 70 1857-60.) 1866—70.| 1858-67.| 1873-4. | 1838-9.
: :
No. of years
observed ... 3 t 3 + 10 1 1
g H=| 0-033 | 0-037 | 0-066 | 0-038 /.. 0°039 | 0:013
Lie 152 89 62 83 eke 60 2
g fs = 1°738 1:°074 | 3:°240 3°101 3128 0°145 | 0°331
ec 139 244 II 12 3 292 26
g H =| 0-022 0-012 0-056 0-058 | 0°030 | 0°004 | 0-003
ac 179 186 316 313 312 72. 116
S ine ee eeee . e | eerecee e eee 0 ‘002
6 K =='| secece ee . eee 235
R gE a ns ree ee: fees yd ey See | Fe ‘ 0-001
: ME = ee take lee || Ue leiee ale) | ie eile\s win ee ee Ii4
M Hy | 0026 0°015 0-020 | 0:°039 0-033 0°025 | 0-004
5 = 104 292 258 336 262 261 100
M i — 5 °163 2°048 ; 10°100 9 ‘881 9°758 | 07159 | 0:433
ie 98 194 326 327 319 286 23
M [0036 0:086 | 0:°124 | 0:°097 0°104 | 0:008 | 0-016
ee 118 180 324 324 293 217 167
M He —) 30-085 0°468 0-702 0 °683 0°479 | 0:010 | 0-004
a 109 32 222 223 213 260 296
M ha =| 0:074| 0°207 0-211 0°184 | 0:070 | 0:007 | 0-005
Dk 50 70 348 350 34 277 94
M ES aS see 0-012 0:077 | 0-061 0°010 | 0:005 0-001
89) Gc eee 49 271 285 352 259. 1°" 968
o1F =| 0°434 | 0:°163 0°377 | 0-366 0°370 | 0°372 | 0-140
as 85 353 43 49 4i 291 98
K H =| 0-880 | 0°295 0°358 | 0:°353 0-391 0°638 | 0-244
a 248 114 194 195 188 300 121
K H=]| 0-488 0-301 0 °939 0°9384 | 0:°890 | 0:°057 | 0°138
tc 1— 135 239 7 4 358 288 23
P | sO tae, 0-108 0-130 0°126 0°146 | 0O°156 | 0:056
k= 232 108 192 180 174 297 132

s{/H= 02028 0. a eee veseee | 0°026 | 0-029] 0-009
Ve | B2Aae S.aic o's aye” I deletite ee ol spain otal 122 310 118

Harmonic Analysis of Tidal Observations. 197

Table ITI.

29, West Hartlepool. 30, Portland Breakwater. 31, Liverpool.
32, Jnverpool. 33, Helbre Island. 34, Freemantle, West Australia.
30, Mauritius, Port Louts.

N.B.—English ports referred to G.M.T.

29 30 31 32 33 34, 35
| Years. | 1858-61. Pape 2,’| 1857-60.| 1866~70.| 1858-67.| 1873-4. | 1838-9.
a No. of years
observed . 3 4 3 4. 10 1 E
a | ee — |
fe =| 0°148 mur lbaaiel oie axe 0-118 | 0°099 | 0-024
Lk = 32 ee eeee 345 290 78
Ee =a Or 2005) O- ll | 0-540 | 0-521 | -O-428' |. 0-021 | -0:033
as 114 111 345 328 331 244 +
Nii =| 0°988 | 0-4 1-923 | 1°888 ,; 1-857 | 0:041 | 0:137
= 73 185 306 305 295 340 32
r i =| 0°095 | 0:°083 | 0°259 | 0°204} 0°194 |) 0:006 | 0:°018
k= 116 £L7 337 336 334 356 298
og =| 0°270| 0:°115| 0°570| 0°498 | 0°488 | 0-012 | 0-008
= 88 140 285 297 278 232 257
Ve —ts O;O8o | O-3a74.|) O-Z9E | 0-228 | O-083'| O-O16 ; O:@19
Mle = 6 196 38 4I 34 324 317
R{e =] MOUS Se ee ae LTS 20) oe Bese 6 0-050
= 158 46 : 359
Lp a 4) a 2 ee Oe 2a isis ia : 0 °254 {
k= ZOO Mace alee eee ce cee 327
H=j| 0°044} 0°267| 0:404| 0°407} 0:280
MS
k= 126 go 270 270 267
= 5) OFO26' |) G-059 | 0-152) > O12 |. OEY
28M
i 310 353 216 227 22%
ee OE. race « ams OIA i 064) | ac. 0°079 | 0-047
Mm
k= 93 wecsvaleis 165 ZOCOR |i se vetele 147 297
oe { = Or OG Tew cies 6. 0°036 | 0:057 0-082 | 0-036
feo 205 eesece I41 344 e e 25 350
Hi= |, 0-137 0-058) OF05E | wa. 0°032 | 0:015
MSf
k= BQ | eawaee 246 68 : 178 gI
sa fi =| 0°265 Ac Ondaa\e Or 407) | a. 0°537 | O-211
k= 219 227 QP 2D Powe es sve 27 346
Ss fe =i OF09F |r e. own 0°128 | 0:°185 0°175 | 0-118
82
kK = 223 175 229 eee 126 118

198 Major A. W. Baird and Prof. G. H. Darwin.

Table III.

36, Falkland Islands, Port Louis. 37, Malta. 38, Marseilles.
39, Toulon.

36 37 38 39
Years. 1842-3. 1871-2. 1850-1.

a s ai Mean of
Seen gaa 1847, 48, 53.
| observed... il if 1
be is fa a a Eee
| .« fH=!| 0-289 0-009 0-019 0-011
i WR] La
| k= 2 162 48 20

R fs = 0 °492 0-120 0-078 0-091
Sy ss 195 100 247 250
9 ae = 0-007 0-001 0-003 0-002
ae = 64 B7 277 288

H =
Ta
\
al =
es
Mu 1 = 0-024 0-005 0-003 0005
1 Be
k= 79 69 124 168
M Ae = 1 544, 0°197 0°220 0-195
2
k= 157 93 228 246
M H = 0:018 0-002 0-005 0-004.
ie = 83 204 185 174
| M le _ 0-068 0°003 0°019 0-014
TEs 357 350 o 352
a 0-012 0-001 eo eeeseere 0 ‘001
OT ee 76 26 Mtotehe ooeveae 145
M Le = 0°010 O-OUS We al seclereaiolone tere 0 002
8 a
2 = 193 127 set eee eens 60
012 = 0°451 0-024 0-069 0-060
k= 4 83 106 120
K Aes = 0°358 0 ‘035 0°104 0°105
; |
k= 37 | 43 181 186
K il = 0-170 0-033 0:016 0°019
ha 206 110 254 254
Pa = 0-141 0:011 0 040 0 °041
po == 87 58 182 178
ees sjolete el 0-001 0-008 0:005
k= . 59 198 176

|
}
|

Harmonie Analysis of Tidal Observations. 199

Table III.

36, Falkland Islands, Port Lowis. 37, Malta. 38, Marseilles.
39, Loulon.

39
Years.
i Mean of
No. of years Peet,
observed...
Ee 0-010
Qk = 44
EE = 0-009
De = 255
nos 226
ee 0:010
‘Sa eeaee 308
Eo O-O1L
"lke = 158
i 0-009
ape 193
He
K —
aa
K ==
Mey
lp =
asm]
K —
Mm4 io eeo2n2 0024 e2zee ve vee 0-010 0°057
Kk = Cece ence te sececeee 293 196
oe { —— i. audieenele es e eeeeesecceve 0-019 0:061
a SE rhs ava sia orehtaneie 229 159
use| 2 = ececaereeve eereceeeeee 0:008 0-029
Fem ease lecres caver |b Viase ale: oi Safar wed 41 323
Saf = Bh NS pee | RE ORT Ee 5 0°151 0 °123
He ae eel bles ay sicn's : OU Occ ec 185 254
Sadi a Peary ae id lie. shu s madegelen ga 0°170 0-108
k= oehel seed sier ere eisreteats 118 114

200 © Major A. W. Baird and Prof. G. H. Darwin.

Table IV.
Penobscot Bay.

1870. | 1871. | 1872: 4 187s. | ISA. || WSyae Mean.

——

0-068 | 0°015 | 0°022 | 0:020 | 0:020 | 0:002 0°024+ 0°004
129 78 67 123 73 25 65°9 2%z10°8

0-825 | 0-735 | 0-776 | 0-797 | 0-746 | 0-747 | 0-7714 0-007
350 | 356 | 357 | 354 | 354 | 358 | See gee
0-008 | 0:004 | 0-003: | 0-006 | 0-005 | 0-004

113.1) "73 |), 348 222 350 29

Not reduced according to same rules as the rest of our results
and omitted.

4°878 | 4°849 | 4°910 | 4°911 | 4°884 | 4°937 4°895+ 0-008
320 319 320 320 320 320 | 319/62 a7enee

-0:012 | 0:002 | 0-009 | 0-012 | 0-006 | 0-002
263 135 161 123 279 229

0°039 | 0°021 | 0°019 | 0°028 | 0:020 } 0°022
160 154 173 115 7) tat

0-118 | 0°115 | 0°121 | 0°125 | 0°122 | 0°119
61 60 65 61 60 58

0:017 | 0°014 | 0-009 | 0°018 | 0-014 | 0-016
336 314 | 354 336 326 320
-0°363 | 0°351 | 0°364 | 0°353 | 0°354 | 0-366 0°359+ 0°002
113 109 114 109 112 110 Lire ae 55

0°455 | 0°459 | 0°452 | 0°452 | 0°459 | 0°440 0°453+ 0-002
129 130 132 129 129 129 129°6 + 0°35

0°256 | 0°229 | 0°226 | 0°195 | 0-235 | 0-238 0°230+ 0-006
5 351 359 2 4 352 | 358°8 E17
0:°152 | 0°151 | 0:148 | 0°152 | 0°155 | 0°160 0°153+ 0:°001
127 113.23 137 132 124 131 130° as a0ee

0:025 | 0°014 | 0-026 | 0-031 | 0:019 | 0:009 0 °020
341 266 320 315 323 292 315

Harmonic Analysis of Tidal Observations. 201

1871.

0-060 | 0°058

245

Zeit

0°336 | 0°172

190

1°046
295
0 °083
162
0°162
301

0:043
237

0-068
227
0-189
239

0°036
308

0°039
297

0-082
96

0°012
I

0°190
161

0.080
120

187

1°136
291

0°132
256
0-335
317
0 :034
194
0:°026
26
0:°104
139
0°016
210
0:°014
135
0-069
35

0:°037
208

0-157
yet

0:176
162

0°090 | 0°093

48

Be

Table IV.
Penobscot Bay.
1872. | 1873. | 1874.

0:073 | 0°058 | 0:077
259 246 Ze
0°195 | 0°285 | 0°223
156 193 219
0-986 | 0°929 | 0-991
287 289 291
0°043 | 0°120 | 0-156
146 256 125
0°093 | 0°320 | 0°215
306 317 263
0°015 | 0°031 | 0-048
176 241 219
0-055 | 0°050 | 0 035
92 352 182
0°190 | 0°233 | 0°156
Ho 331 243
0°025 | 0°010 | 0:028
21 299 ul
0°021 | 0°025 | 0:055
318 270 327
0:024 | 0:074 | 0:057
34 296 279
0°048 | 0:047 | 0:073
II 212 4
0°163 | 0°229 | 0:180
152 161 159
geoge NO N20 RO: Lis
lel 167 188
we fey | 10 09 FO 026
sees III 146

1875.

0:073
284

0°209
209

1-027

289

0°177
234,

0-289 |

323

0-035 |

202

0-062
8

0-087
123
0°010

75

0-025 |

41

0°014
110

0-040
O5

0°123
159

0 °262
226

0°152

Mean.
0°066+ 0-002
GAT) BE 8) 85]
0°237+ 0°017
192-1 ten6-4
1°019+ 0-°019
29073, a= O78
0:064
196
0 °274
F 308
0-032
216
0-022
288
0°174+ 0°010
BS7 = Liz

\« is computed

i on hypothesis
that these are

( astronomical

74 |) tides.

202

Major A. W. Baird and Prof. G. H. Darwin.

Table IV.

Port Townsend.

1874.

0-086
rakes

0-557
130

0-007
349

Commence, January, 1874.

1876.

0-102
114

0 °542
129

2-218
108

0°022
298

0°125
290

0°028

Mean.

0 ‘087
L632
0 552
129°5
0:010

327

Astoria, Oregon.

1875.

0 °053
117
0 °774
38
0-009
341

2°942 |

1876.

eeoase

Mean.

0-052
II5

0-788
40

0-009
344

2 °937
119

0°021
68

0°101
326

0°031
116

0-762
118

1-289
12g

0° 224.
26

0-360
96

Harmonie Analysis of Tidal Observations.

Port Townsend.

Table IV.

Astoria, Oregon.

Commence, January, 1874.

1874. 1875.
O29 7 Ovsld
119 124
0 085 0°107
347 356)
0 °461 0 °466
82 81
0:045 0:031

6 29
0:156 0°089
76 46
0:078 0-098
35% 7
0:010 0°008
35+ 214
0:071 0:050
38 239
0-062 0-072
319 310
0:011 0:017
62 42

1876.

0 °295
124
0-080
320
0 :440
79
0:019
334
0 :029
137
0 :059
356
0 :020
241
0° 108
175
0:058
318
0:018
41

Mean.

0-302
122
0-091
341

0 °456
80

0-031
2

0:091
86

0:078
358

0:°013
269

0-064
316

0016 |

49

1876.

203

rr A A ER

204 Major A. W. Baird and Prof. G. H. Darwin.

San Diego.

Table IV.

Commence 0h., January 1, 1869.

Wear’ &... | ° 1869, 1870.
g a 0 °024, 0 °024.
Neh 5 54 51
R Ae ee O°701 | 0-697
rc 274 274
g ee 0:006 | 0-005
ee 221 169

A=
B41. =
H =
Se 5 i
Te
M1; z
nS el oe 2 al as ite
Met =) 29g 279
= | 70-0087); 0-012
Ms), = 32 67
Hi = | 0°025 0 026
M4 7 = 200 193
yf =| o-oo | o-onr |
SLi = 150 118
ne
M,{ Z
On =| 0°697 | 0-698
2 = a1 41
K Ee 1-010 1-010
Ye == 96 96
K He) 0-207 0° 202
ae 2.68 265
Pat =| 0°358 0 °349
es 93 92

1871. | Mean.
0°023 [| 0:°024
12 39
0°716 | 0-704
275 275
0°006 | 0:°006
204. 207
1°G97 | 17703
280 279
0°005 | 0-008
48 49
0:030 | 0:027
194 196
0°009 | 0-010
IIo 126
0°714 | 0°703
72 71
1-010] 1 :-G10
96 96
0°194 | 0:°201
266 266
0°339 | 0°349
95 93

St. Thomas.

Commence October 4, 1872.

1872-3. | 1873-4. | 1874-5.] Mean.

— || ———__ — —_—-..

0-007

233

0-030

245

0°1381
208

0° 237
149
0-290
173

0 082
190

0°017 | 0°008]} 0-011

249 251 244
0-032 | 0-031] 0-031
243 242 243

0°121 0°119 | 0:°124
208 207 208

0°240 | 0°253 | 0°243

153 156 fF 153
0:296 | 0-300] 0-295
170 170 171

0-080 0°073 0:078
167 170 176

Hlarmome Analysis of Tidal Observations.

San Diego.

Commence 0 h., January 1, 1869.

Year 1869.
oF 2
aa 62
n{t = 0 423
ik = 262
4a zs
kK =>
ae
Vv
a

aS 0 024
Plk = 256
Ba 2
kK =
te
=
ms {3 =
K =
asm { 3 =
K =
Mm =
ea
es
fe =
mse] f=
kK =
oa
K

Sea aay
K —

oe eo ee

Table IV.

1870. 1871 Mean. || 1872-3.) 1873-4. | 1874-5.
0°028 | 0°032 | 0:°042
29 Ty 69
0-412 | 0-401 | 0°412
263 264 263
0°037 | 0°017 | 0:026
244 258 2.53

Mejteorologi|cal

Sialic oi MW era «, Pa 0°007 | 0-037

O50 Tillie CCNOCRN (REINER COUT |ltoncle ea ae 355 Byes
Behdickod ili An 0°049 | 0-061

doc oc : aia 3 93 207

St. Thomas.

205

Commence October 4, 1872.

Mean.

206

Major A. W. Baird and Prof. G. H. Darwin.

0129

0°103

0°013

Table IV.
Sandy Hook.
1878 1879.
0:028 0-025
254 2.16
0 °436 0 :44.5
248 245
0-033 0 °033
83 81
Dae, 2 244.
218 218
0:021 0:035
202 192
0-017 0:020
336 oom
0 °053 0-046
351 344
0°1853 0°157
99. IOI
0 -34U 0 °337
go gI
0°118 0:114
30 40
v‘091 0 :100
103 107
0:°014 0:014
145 III

1880. 1881.
0 '036 0 049
255 237
0°416 0°435
242 249
0 037 0 :041
68 52
2 °229 2-250
215 216
0-029 0-030
zg) p 206
O :024. 0 :027
Ba5i 329
0:057 0 °059
344 342
Onan 0:176
go 100
0-333 0 °34.2
83 go
0-130 0:160
$5) 40
0:102 | 0-100
TOG han 108
0-009 0 025
107 134

Mean.

0032
235

0° 434
246

0-038
69

Harmonie Analysis of Tidal Observations.

0°083

00380 |

0-039
131
0-110
a7
0 °507
196

0-039
26

0°124

238

0°063
216

0-030
241

0:105
34

0037 |

122

0014
158

Table IV.
Sandy Hook.
1878. 1le7@.
0:029 | 0-083
10% 133
0-108 | 0:G84
3° 59)
0°532 | 0-500
199 2.02
0:030 | 0-029
2.6 69
0°167 | 0:°153
198 170
0:094 | O-O61
235 207
0:010 | O-O11
1g 16
0°046 | 0:075
306 155
0:050'| 0°039
107 116
0:007 | 0-021
66 225)
0:°010 | 0-042
334 Ah
0-066 | 0-072
164 203

1880.

0-011
2.30

0 ‘060
236

0:014 |

23

0 °058

193

207

0 042
113

0-068
208

, \ Peles

+

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e-VOL, XXXIx. No. 240.

vy
Se ee ee
= : S
a“ > |
CONTENTS.

November 19, 1885.
5 PAGE
I. On the Total Solar Eclipse of September 9, 1885 (in a Letter to Professor

Stoxss, Sec. R.S.). By James Hector, _MD., F.R.S., Director of
the Geological Survey, New Zealand . Sees : ; . 208

II. On the Total Solar Eclipse of September 9, 1885 (in a Letter to J. N.
LooxkyeR, F.RS.). By A.S. ATKINSON. : : 5 wo Ziel

III. Report on a Series of Specimens of the Deposits of the Nile Delta,
obtained by the recent Boring Operation. By J. W. Jupp, F.RS.,
Sec. G.S., Professor of Geology in the Normal School of Mines. Com-
municated by desire of the Delta Committee .. : : . . 213

IV. On Evaporation and Dissociation. Part I. By Professor Wittiam
Ramsay, Ph.D., and SypNry Youne, D.Sec., Lecturer and Demon-
strator of Chemistry i in University College, Bristol : : - 225

V. On the Phenomena accompanying Stimulation of the Gland-Cells in the
Tentacles of Drosera dichotoma. By WILLIAM GARDINER, M.A.,
Fellow of Clare College, Cambridge, Demonstrator of Botany in the
University . B : : 6 : : , : ; : 229)

VI. On Variations in the Amount and Distribution of Fat in the Liver-Cells
of the Frog. By J. N. Lane ey, M.A., F.R.S., Lecturer on Ce
in the University of Cambridge . : ‘ : ; ; 234

For continuation of Contents see 4th page of Wrapper.

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CoNTENTS. '
XIII. On the Dynamics of a Rigid Body in Elliptic Space. By R. S. Huaru, B.A.
XIV. Researches on Spectrum Photography in relation to New Methods of

Quantitative Chemical Analysis. Part II. By W. N. Harrtey,
ERSE., &. |

XV. On the Transfer of Energy in the Electromagnetic Field. By J. H.
Poyntine, M.A.

XVI. On the Motion of Fluid, part of which is moving Rotationally and part .
Trrotationally. By M. J. M. Hin, M.A.

-. _ XVII. On the Electro-chemical Equivalent of Silver, and on the Absolute Electro-
motive Force of Clark Cells. By Lord Rayueien, D.C.L., and Mrs. H.
Sipe@ewick. :

XVIII. Influence as Change of. Condition from the Liquid to the Solid State on _
Vapour-Pressure. By WinirAmM Ramsay, Ph.D.,and Sypnry Youne,
D.Se. ;

XIX. A Record of Experiments on the Effects of Lesion of Different Regions of
the Cerebral Hemispheres. By Davip Ferrier, M.D., LL.D., F.R.S.,
and GEraLp F. Yo, M.D., F.R.CS. © -

x

XX. On the Comparative Morphology of the Leaf in the Vascular Cryptogams
and Gymnosperms. By F. O. Bower, M.A., ¥.LS.

X XI. Conditions of Chemical Change in Gases: Hydrogen, Carbonic Oxide, and
Oxygen. By Harotp B. Dixon, M.A.

Index to Part II.

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Harmonie Analysis of Tidal Observations.

K 118
Bes 0°103
kK = 52,
Nile = 0:470
k= 198
ny Ea 0-012
i = 15
iE — 0-045
v
lek = 178
H = 0-072
en = 221
Rit = 0:020
a 324

K 116
asm { 8 ot 0:018
t= 138
Mm {2 BG
K —
orl e =
i
mse { # = 0-030
a 41
g he =} 0:083
a
a 224,
Sea { cy
=

Table IV.

Sandy Hook.

SWE

0-039
131

0:110
4?

0°507
196

0-039
26

0°124
238

0°063
216

0-030
241

0°105
34

0-037
D22

0°014
158

0:014
171

0 ‘066
2.2.5

1878.

0-029
107
0-108

30
0-532
199
0-030
26
0-167
198
0-094:
235
0-010
i)
0:°046
306

0-050
107

0:007
66

0:010
33%

0-066
164

1879.

0°033
133

0084:
a5

0° 500
202

0042
224

0-072
203

1880.

0°011
2,30

0-060
236

1881.

0 °037
134
0-072
21
0°475
199
0-062
13
0:077
253
0-039
2,36
0:037

9
0:058
23
0-040
114.
0°005
343

0°014:
23

0-058
198

207

Mean.

0-035
120

0-092
31
0-490
ng)
0 :036
35

0°105
198

0-069
227
0-030
334

0-042
113

0 :068
208

VOL. XXXIX.

208 Dr. Hector. On the [Nov. 19,

November 19, 1885.
THE PRESIDENT in the Chair.

In pursuance of the Statutes, notice of the ensuing Anniversary
Meeting was given from the Chair.

Mr. Cornelius O’Sullivan and Dr. Sydney Howard Vines were
admitted into the Society.

Professor W. G. Adams, General Boileau, Dr. Huggins, Dr. Perkin,
and Dr. Rae, having been nominated by the President, were by ballot
elected Auditors of the Treasurer's Accounts on the part of the
Society.

The Presents received were laid on the table and thanks ordered for
them.

The following Papers were read :—

I. “On the Total Solar Eclipse of September 9, 1885 (in a
Letter to Professor STOKES, Sec. R.8.).” By James HEcTOR,
M.D., F.R.S., Director of the Geological Survey, New
Zealand. Received October 22, 1885.

Wellington, September 12, 1885.
Dear Sir,

On the 5th instant I duly received your note of the 15th July,
enclosing instructions drawn up by the Committee for observing the
solar eclipse which took place here on the 9th.

- he instructions were circulated in all quarters where they were
likely to be of use. You will observe from the enclosures that unfor-
tunately both the parties equipped by Government, in their anxiety
to get as near the line of centrality as possible, encountered bad
weather, so that no observations were made which can be considered

1885. ] Total Solar Eclipse of September 9, 1885. 209

to have scientific exactitude. The eclipse, however, was very dis-
tinctly seen at Wellington, and I have been able, with the assistance
of friends and the accounts in the newspapers, to obtain the following
information concerning it.

Scarlet prominences were only moderately developed, and were
clustered chiefly at the equatorial and polar regions of the sun. The
best observers agree that the corona had a very irregular outline, and
was most continuous and vivid close to the sun’s limb, having the
longest expansion reaching to nearly two diameters from the western
equatorial region. This large expansion appears to have had a
strongly marked spirally twisted structure, while all the other
appendages consisted of radiating pyramids. No laminated structures
appear to have been observed in any part of the corona.

Most observers agree in describing an intensely brilliant flash or
meteor, lasting for two seconds, at the commencement of totality on
the eastern side of the sun, and exactly over the position of a large
sun-spot that was just coming into view at a few degrees south of the
sun’s equator. This flash is described as having looked like a large
electric lamp suspended ata little distance from the moon’s edge. At
the close of totality another flash, similarly bright, but not so large
and pointed, was seen on the western limb of the sun in a position
corresponding with a large sun-spot that was within l' of are of
passing over the sun’s edge.

The following is a list of the enclosures :—

1. Notification of the Committee’s instructions.

2. Charts of shadow path showing the position of Dreyertown and
Otahao.

3. General time plan of eclipse by Mr. Arthur Beverly.

4. Silver print of totality by M. Cazneau, Wellington.

5. Enlarged drawing from a negative }'’ in diameter of the totality,
photographed by Mr. Gell, Wellington.

6. Sketch by Mr. J. Buchanan, F.L.S.

7. Three sketches taken during totality at Wellington by Mr. T.
W. Kirk. These were taken in succession as marked 1, 2, 3, the sun
being intersected by a plumb-line, and disclose the remarkable feature
that the N.W. extension of the corona shifted its position with refe-
rence to the prominence.

8. Generalised sketch from various sources, showing the outline of
the corona, the position and shape of the prominences, and the
positions, marked by red crosses, where vivid flashes of light were
seen at the moment of beginning and end of totality. All agree that
these flashes were like electric lights, and quite dazzling, the first
being large and round, while the last seen was small and pointed.

9. Sketch of the large spirally twisted flame of the corona over the
N.W. quadrant, as sketched by Mr. H. P. Higginson, C.E., with a

P 2

SR ae
ae |

210 Totul Solar Eclipse of September 9, 1885. [Nov. 19,

binocular glass. As Mr. Higginson observed and sketched the great
eclipses of 1869 and 1870 in India, and is an accomplished draughts-
man, he had previous experience to assist him.

10. Complete sketch by Mr. Higginson of the total eclipse finished
from a drawing made with a binocular.

11. Sketch with the naked eye, by Mr. Alfred de Bathe Brandon,
junr., which also shows the twisted character of the large coronal
appendage.

12. Sketch showing the position of the sun-spots that were visible
at the time of the eclipse, (a) being a very large spot that was just
passing off, (b) a spot not visible before the eclipse, which has since
developed into an intensely black sharply defined spot of moderate
size.

13. Extracts from newspapers.

In conclusion, it is hardly necessary for me to state how much I
regret that I am unable to give you fuller and more precise informa-
mation founded on my own observation.

(Signed) J. Hecror.

[The publication of a selection of the illustrations is deferred
until some additional drawings or photographs expected from New
Zealand shall have arrived. Enclosure No. 1, giving an account of a
lecture delivered by Dr. Hector before the eclipse, is subjoined, with
the omission of a portion at the beginning, the interest of which has
now passed away. |

(Hatract from Enclosure No. 1.)

The chief interest of the eclipse will le in the observation of the
scarlet prominences and of the silvery light of the corona or halo that
surrounds the sun during the period of total darkness. The pro-
minences may be expected to have great brilliancy, as for some weeks
past the spots on the sun have shown that its surface is in a state of
violent activity, and one of such unusual size as to be almost visible
to the naked eye, will have reached such a position that it will coicide
with the left hand edge of the sun at the time of the eclipse, and
from this point unusually large flames should be looked for; for
observing these flames it is necessary, in order to intensify their
light, to use a fragment of rose-tinted glass. On the other hand, to
observe the light of the corona to perfection, a very pale biue-tinted
glass is necessary, so as to cut off the red light and intensify the pale
silvery light of the corona. A telescope of high power is quite un-
suitable to the observer, but a wide field opera glass will be useful.
Instructions have been received from the Committee of the Royal
Society, which relate partly to the taking of a photographic, spec-

“aw
oe

1885.] Total Solar Eclipse of September 9, 1885. 211

troscopic, and other observations that require special instruments,
but the following extracts may be of use to most observers :—Draw-
ings of the corona have only seldom proved to be of great utility. If
such drawings are attempted on the present occasion, observers
ought to pay attention to the general outline of the corona rather
than to points of detail. A plumb line ought to be suspended, if
possible, between the observer and the sun, so as to fix the position of
the corona in the sky as accurately as possible. The vertical line
ought to be indicated on the drawing. Observers will find it useful
to draw the black disk of the sun and the vertical line before the
beginning of totality. . . . Observers unpractised in accurate drawing
will obtain more useful results by paying attention to certain features
of the corona than by attempting what can only be a very rough and
inaccurate sketch of the corona. Definite answers as to the following
questions, for instance, would be of great value:—(a) To what dis-
tance from the sun, estimated in solar diameters, can you trace the
corona? (b) Does it extend further in some directions than in
others, and what are the directions of greatest and least extent?
(c) Is there a line of approximate symmetry in the corona, and what
is the direction of that line? ‘The answers to the last two questions
ought, if possible, to be given in angles from the vertical line, or from
some definite great circle.

II. “On the Total Solar Eclipse of September 9, 1885 (in a
Letter to J. N. Lockyer, F.R.S.).”. By A. S. ATKINSON.
Received November 19, 1885.

I observed the eclipse from a spot in my own ground in Nelson,
which, as determined for the transit of Venus, is in lat. 41° 17'1:9"S.,
and long. 173° 17’ 57:5" EH.

The sky was very clear, and there was no wind, but the air was
optically very unsteady.

As totality was approaching, perhaps two or three minutes before,
I tried with the telescope (5-in. Cooke, power 60) if I could see any-
thing of the corona behind the moon, but could not in the time I
allowed myself; I was afraid of waiting longer, as I had made
arrangements for taking some small photographs, and had to super-
intend ; and as I wished also to answer the questions of the Committee
of the Royal Society, I thought it best to observe the main phase
with the naked eye.

I may, perhaps, note here, that in finding my way with the telescope
to the moon’s following limb, I chanced upon Jupiter, the appearance

212 Total Solar Eclipse of September 9, 1885. [IN ov. 19,

of which surprised me greatly. It was, of course, “boiling” a good
deal, but at the moment I caught sight of it, it seemed to have one
broad uniform equatorial belt, with at least its northern edge rather
sharply marked; in breadth it seemed about one-third of the planet’s
(polar) diameter, and in colour distinctly pink. This belt disappeared
and reappeared with the motion of the air. I shifted my eye in the
telescope, but the breadth and colour seemed constant on each
reappearance, so long as I looked, which was not, however, very
long.

As the sun was just disappearing, the most striking phenomenon
I noticed, looking straight at it, was a strongly marked pulsation in
its light ; those who were looking away from it saw waves of shadow
passing rather rapidly over the ground. This also, I supposed, was
from the unsteadiness of the air, but to me it seemed not the least
striking part of the great spectacle to see the sun flickering as 1t were
before it went out.

The following are my answers to the questions of the committee :—

a. I estimated the greatest distance from the moon’s limb to which
I could trace the corona as from two-thirds to three-fourths of a
diameter.

b. The corona extended much farther in one direction than in any
other. By far the greatest feature in the corona was a broad-based
but hollow-sided cone of white light, with well-marked edges, and a
rather sharp point, the axis of which I judged to be from 40° to 45°
from the perpendicular towards the west. The “least extent ” of the
corona, as I saw it, was the same in several places, where there was
only a narrow rim of light round the moon’s limb. There were other
smaller but more or less similar prominences of pure white light, all
of which, I may say, gave me the idea of radiating from the sun’s
centre.

c. There was, in my opinion, no line of “ approximate symmetry ”’
in the corona. I looked right round the sun with a view to answer
this question, and that was the conclusion I came to without hesita-
tion. As there was nothing to balance the large “ cone,” the nearest
approach to symmetry would have heen obtained by taking its axis
as the line, but I should not have called the result of this division
‘* approximately symmetrical.”

The only red prominences I saw were a row of six or seven small
ones (Bailey’s beads ?) extending from about the vertex towards the
east. Large ones were seen by others, and I believe are those which
alone appear in the photographs.

Mr. J. R. Akersten obtained for me two photographs during totality,
one immediately after it began with an exposure of probably a little
less than a second; the other a few seconds later, with about double
the exposure. <A third plate was all but ready when the sun

1885.] Report on the Deposits of the Nile Delta. 213

reappeared ; it was taken just afterwards, but still shows some of the
“‘red flames.”

I took the duration of totality with a stop-watch, but afterwards by
a momentary inadvertence lost the record.

I may add that at a time which I estimated to be from 15 to
20 seconds after the sun’s reappearance, I could with the naked eye
easily see the coronal light round the preceding limb of the moon, and
called the attention of the bystanders to the fact.

In conclusion I would add as some evidence of the clear sky which
we commonly get in Nelson, that from my own knowledge not only
the whole of this eclipse, but egress in both the late transits of
Vexus, could not have been better seen than from this place.

(Signed) A. 8. ATKINSON.

III. “ Report on a Series of Specimens of the Deposits of the
Nile Delta, obtained by the recent Boring Operations.” By
J. W. Jupp, I’.R.S., SEC. G.S., Professor of Geology in the
Normal School of Science and Royal School of Mines.
Communicated by desire of the Delta Committee. Received
November 12, 1885.

Neither of the borings made for the Royal Society, under the
superintendence of the Engineers attached to the Army of Occupation
in Egypt, appears to have reached the rocky floor of the Nile-Valley,
nor do the samples examined show any indication of an approach to
such floor. What were at first supposed to be pebbles in one of the
samples from Tantah, prove on examination to be calcareous con-
cretions (“‘ race” or “‘ kunkur”’).

Nevertheless these borings appear to have reached a greater depth
than all previous ones in the same district, except the boring made
near the Barrage, which is said to have attained a depth of 122 feet
without reaching the rock, and one at Rosetta which exceeded
153 feet. The deepest boring made by the French engineers in 1799,
that at Siut, attained a depth of 77 feet 73 inches; at a later date
M. Linant de Bellefonds (Linant Bey) carried a boring near the apex
of the Delta to the depth of 72 feet. In the case of the excavations
made for Mr. Horner about thirty years ago, with the aid of a grant
from the Donation Fund of the Royal Society, few of the borings
exceeded 50 feet in depth; the deepest being that at Memphis, which
reached 59 feet 10 inches. The three borings now reported upon
have been carried to depths of 45, 73, and 84 feet respectively.

The samples from these borings, like those examined by
Mr. Horner, show that the delta-deposits all consist of admixtures, in

214 Prof, J. W. Judd. [Nov. 19,

varying proportions, of blown sand and alluvial mud. I can find no
evidence to support the suggestion made by Sir J. W. Dawson, F.R.S.
(see Colonel Maitland’s letter of 21st January, 1884, and “ Geol. Mag.,”
Dec. 3, vol. 1, p. 292) from a hasty examination of the specimens,
that ‘“‘at a depth of 30 or 40 feet the alluvial mud rests on desert
sand ;’’ on the contrary these borings, like those of older date, show
that the deposits of the Nile Valley consist of a succession of different
beds in some of which sand, and in others mud, forms the predominant
constituent.*

The chemical composition of the Nile-mud has been investigated by
many chemists—by Regnault in 1812, by Lassaigne in 1844, by
Lajouchére in 1850, by Payen and Poinset in 1850, and by Houzeau
in 1869. At the request of Mr. Horner, Messrs. Johnson and Brazier
undertook a series of careful analyses of the muds and the sands of
the Nile-Valley deposits in Dr. Hofmann’s laboratory, and the results
which they obtained are published in the ‘ Philosophical Trans-
actions,” vol. 145 (1855).

But hitherto, so far as I am aware, no detailed investigation of the
microscopical characters of the deposits has been undertaken, and to
this investigation I have therefore devoted my special attention. The
methods of examination were determined upon after consultation with
Professor T. G. Bonney, F.R.S., P.G.S., to whose advice and assis-
tance I am greatly indebted; the preparations were made in the
Geological Laboratory of the Normal School of Science and Royal
School of Mines. The general results attained by this study of the
Nile- Valley deposits are as follows.

The sands, when separated from the mud by washing, are found to
be made up of two kinds of grains, the larger being perfectly rounded
and polished, while the smaller, on the contrary, are often subangular
or angular.

The larger and well-rounded grains may be described as micro-
scopic pebbles; their surfaces are most exquisitely smoothed and
polished, and their forms are either globular or ellipsoidal. In size
they vary greatly, being occasionally as large as a small pea. They
only very occasionally exhibit traces of deposits of iron-oxides upon
their surfaces. The great majority of the well-rounded grains consist
of quartzose materials.

* [The deep boring at Rosetta, of which an account has recently been sent to the
Royal Society by Colonel Maitland, R.E., shows that alluvial mud and clay occurred
to the depth of 33 feet; thence to the depth of 94 feet various sands and clays
are recorded; from 94 feet to 123 feet “hard clay in lumps” was found; then
various sands and clays to 143 feet; the last 10 feet of the boring was in coarse
sand and pebbles. A fragment of red granite, with undoubted marks of human
workmanship upon it, is said to have been obtained at a depth of 79 feet 4 inches.—
J. W. J., 18th December, 1885. ]

1885.] Report on the Deposits of the Nile Delta. 215

Embedding these grains in Canada-balsam, and examining them
by transmitted light, with the aid of the polariscope, we are enabled
to study their mineral characters with facility. The majority of the
grains consist of colourless quartz, though occasionally rose-quartz,
amethystine quartz, citrine, and smoky quartz also occur. This
quartz exhibits unmistakable evidence of having been derived from
granitic rocks; it is constantly seen to be traversed by bands of
liquid- and gas-cavities, and very frequently contains numerous black,
hair-like inclusions (rutile?). Much more rarely we detect grains of
quartz which consist of aggregates of small crystals, and are evidently
derived from metamorphic rocks. With the pure quartz-grains we find.
also a considerable number of rounded particles of red and brown jasper
aud of black Lydian stone, with some fragments of silicified wood.

But in addition to the different varieties of quartz, particles of
felspar are sometimes found among these large, rounded grains.
What is very remarkable about these felspar-grains is the slight
traces of kaolinization which they exhibit ; they are in fact almost as
fresh and unaltered as the grains of quartz themselves. Ordinary
orthoclase and microcline are most frequent, while plagioclase felspar
is comparatively rare. With the rounded grains of quartz and
felspar, a few examples of hornblende and other minerals, including
jade, also occur.

But far greater is the number of mineral species, especially the
most easily cleavable ones, which are represented in the smaller, sub-
angular and angular, sand-grains. In addition to the minerals already
mentioned, I have recognised several varieties of mica, augite,
enstatite ?, tourmaline, sphene, iolite (cordierite) zircon, fluorspar,
and magnetite, all in a nearly unaltered condition.

The only fossils found in these sands were evidently derived ones;
they include the fragments of silicified wood already mentioned, and
a waterworn nucleus of an Ammonites (Jurassic?). It is evident that
these sand-grains have been formed by the breaking up of granitic
and metamorphic rocks, or of older sandstones derived directly from
such rocks. The larger grains exhibit the perfect rounding and
polishing now recognised as characteristic of A¥olian action ;* the
smaller ones from their larger surfaces in proportion to their weight
have undergone far less attrition in their passage through the air; but
it is fair to conclude that the sands are really ‘“‘ desert-sand,” derived
from the vast tracts which lie on either side of the Nile-Valley, and
swept into it by the action of the wind.

* It is hardly necessary to point out that the study of these desert-sands entirely
supports the important conclusions arrived at by Mr. H. C. Sorby, F.RS., and
Mr. J. A. Phillips, F.R.S., concerning the agencies by which the rounding of sand-
grains is effected. See “ Quart. Jour. Geol. Soc.,” vol. 36 (1880). ‘“ Proceedings,”
p- 50. Jbid., vol. 37 (1881), pp. 6—26.

216 Prof. J. W. Judd. ‘TT Now's,

The mud is a material of which it is much more difficult to study
the mineral characters than the sand, owing to the extreme minute-
ness of its particles. It 1s a very striking fact, however, that kaolin,
which constitutes the predominant constituent of clays, appears to
be almost altogether absent from these Nile-muds. Chips and flakes
of quartz, felspar, mica, hornblende, and other minerals can be readily
recognised ; and it is often evident that the unaltered particles of such
minerals make up the greater part, if not the whole mass, of the fine-
grained deposits. The mineral particles are of course mingled with
a larger or smaller proportion of organic particles. Frustules of
Diatomaceee occur in these muds, as was pointed out by Ehrenberg,
but unless special precautions were observed in collecting the samples
it would be unsafe to draw any deductions from their presence.

In the case of the Tantah boring we find another kind of material
besides the sand and mud. Almost all the samples from this boring
contain angular fragments of an apparently tufaceous limestone. In
addition to this we find minute sand-grains cemented by calcareous
matter into small pellets of various sizes, and the particles of mud
united in the same way are thus converted into argillo-calcareous
concretions. In a sample taken from a depth of 70 feet in the Tantah
boring, a number of irregular masses of this argillaceous limestone
occurred; some of these were nearly 1 inch in diameter, and were at
first supposed to be pebbles. On examination they were found to
contain—

Calcie Carbonate ’.c..ccsc.s cnet onan te
Argillaceous matter......... ee See a 22°7

100-0

There can be no doubt that sources of this calcic carbonate must
exist near Tantah, vrobably in the form of calcareous springs.

The striking peculiarities of these sands and muds of the Nile Valley
appear to be capable of a simple explanation. In countries where rain
falls frequently and vegetation abounds, water charged with carbonic
acid is constantly penetrating into the rocks and breaking up the
compound silicates of which they are composed; the silicates of the
alkalies and the alkaline earths being decomposed and their con-
stituents removed in solution, while the silicate of alumina becomes
hydrated and is carried: away in suspension by water in the form
of kaolin. In this way the felspars and nearly all other compound
silicates are affected to such an extent that in most granitic and
metamorphic rocks they show evidence of extensive “‘ kaolinization,”
while the clays derived from them are made up for the most part
of the crystalline plates of kaolin. But in dry and barren tracts, like
portions of Northern Africa, none of these agencies will operate, and the

1885. ] Report on the Deposits of the Nile Delta. 217

disintegration of the solid rocks is effected by mechanical means ;
the most potent of these mechanical agents of disintegration are the
heat of the sun, causing the unequal expansion of the minerals which
build up the rocks, the force of the wind, producing constant
attrition of the disjoined particles, and torrential rains.

This being the case, it will be readily understood that the sand-
grains will include felspar and other minerals in a nearly unaltered
condition, while in countries where the chemical agents of the atmo-
sphere come into play such particles would be more or less com-
pletely converted into kaolin. In the same way, the mud, instead
of consisting of scales of kaolin originating from chemical action, will
be formed of particles of the chemically unaltered minerals reduced to
the finest dust by purely mechanical agencies.

The chemical analyses which have been made of these Nile-muds
tend to support these conclusions. Instead of containing large
quantities of combined water, as do all the ordinary clays, their
composition is that of a mixture of anhydrous minerals. As the
analyses hitherto made have none of them been undertaken with the
object of estimating the exact proportions of hygroscopic and com-
bined water in these muds, it would be well if some more careful
determination of these two constituents could be made.

But there is fortunately a kind of evidence, derived from chemical
analysis, which is of the greatest value from its bearing on the
questions we are now discussing—that, namely, which is obtained from
a study of the composition of the Nile-waters.

It must be remembered that the Nile is a river of a very peculiar
and exceptional character. The last tributary which it receives is the
Atbara, which falls into it in lat. 17° 38’ N.; from that point to its
mouth, in 31° 25’ N. lat., the river does not receive a single affluent ;
for a distance of 1400 miles, indeed, it obtains no fresh supply of water
except what is brought to it by superficial torrents after heavy rains
in Lower Egypt. It has been clearly demonstrated that, after
receiving the Atbara, the Nile undergoes a continual diminution in
volume in its course through Egypt. This is no doubt in part due to
percolation of the water through the delta-deposits, and in part to the
water being drawn off in canals for purposes of irrigation; but a large
part of this diminution in volume must certainly be ascribed to the
great evaporation which must be going on from the surface of the
river during the last 1400 miles of its course.

' The diminution which takes place in the volume of the Nile in its
downward course is illustrated by the following estimates :—

The French engineers in 1799 showed that at Siut, 240 miles above
Cairo, the quantity of water passing down the river per second
amounted to 678 cubic metres at low water, and 10,247 cubic metres
during high water.

218 Prof J. W. Judd. - [Nov. 19,

But at Cairo, according to M. Linant de Bellefonds (Linant Bey),
the flow per second amounts only to 414 cubic metres at low water,
and 9440 cubic metres at high water. |

If these numbers can be relied upon, the Nile in this part of its
course loses nearly 40 per cent. of its water in a distance of 240 miles
when it is low, and nearly 8 per cent. when it is in flood !

M. Talabot has calculated that only 90,000 millions of cubic metres
of water are discharged per annum from the principal mouth of the
Nile, which gives an average discharge of 2680 cubic metres per
second ; while M. Girard estimates that only a comparatively small
quantity escapes by the Rosetta and Damietta mouths.

Although we shall not be able to calculate the exact loss of the
Nile by evaporation in the course of 1400 miles, through one of the
hottest and driest regions of the globe, yet we cannot doubt that this
loss is enormous. Now the effect of this constant evaporation must
be to concentrate the saline matters held in solution, and we might
therefore anticipate that the waters of the Nile in Lower Egypt would
contain an exceptionally high percentage of saline matters in solu-
tion.

But what are the actual facts of the case?

Dr. C. Meymott Tidy has recently made a series of analyses of the
Nile-water taken at Cairo during each month of the year, and
the results which he has obtained are of the greatest interest to
geologists. These analyses enable us to make the following com-
parisons, which we have arranged in tabular form* :—

Filtered | Filtered | Filtered | Filtered | Filtered
water water water water water
from from from from from
Nile. |Thames.}| Lea. Severn. Shannon.

—. ———q— |— “em —_———K_S. qe | ue

9°53 | 18°24 | 17°99 | 13°95 | 15°30
Total solids in grs. per gallon to to to to to
14°33 | 21°63 | 23°34 | 22°75 | 20°20

i ————— | | SESE"

2°05 6°89 6°16 4°03 5°82
Proportion of lime _ to to to to to
4°35 8°74 9°28 5°43 7°28

ee

5°0 12°9 130 100 9.°5

Hardness before boiling .... to to to to to
| 8-0 14.°3 15 °9 14°3 12°5

1 2 3°1 3°3 5 °O 3°95

Hardness after boiling ...... ; to to to to to
2°8 4°2 4: °4: 9°5 4°7

* “ Journal of the Chemical Society,” vol. xxxvii, 1880, ‘‘ Transactions,” pp. 268
—327.

1885.] Report on the Deposits of the Nile Delta. 219

The examination of this table shows that the waters of the Nile,
judged either by the proportion of solids in solution, the percentage
of lime, or by the temporary and permanent hardness, exhibits some
very remarkable anomalies. That the variation in the quantities of
dissolved salts at different seasons of the year should be much greater
than in the case of any of the other rivers, is not surprising when we
bear in mind the great and rapid additions to the volume of the
river during seasons of flood. But it is startling to find that the
water of the Nile, instead of containing a much larger proportion of
saline matter than other rivers—as we might anticipate from the
enormous evaporation constantly going on from its surface—in reality
contains far less dissolved matter than any of the other rivers here
compared with it. This contrast is scarcely less striking in the case
of the comparison with the Severn and the Shannon, which flow over
Paleozoic rocks, than in that of the Thames and the Lea, which
drain areas occupied by Mesozoic deposits.

A little consideration will show, however, that this eacHliite and
seemingly anomalous result is capable of a very simple explanation.
The substances dissolved in the water of rivers is of course derived
from the materials composing the rocks of the river-basin, through
the action of water holding carbonic acid or other acids in solution.
In this kind of action, rain which takes up the gases contained in the
atmosphere, and then percolates into the interstices of rocks, plays a
most important part. Rain is, in fact, the great agent of chemical
disintegration, and where rain falls the complex silicates composing the
hardest rocks are attacked, the silicates of potash, soda, lime, magnesia,
and iron being broken up and carried away in solution, while the
silicate of alumina takes its hydrated form of [Save], and remains
behind or is removed in suspension.

But in districts where there is little or no vegetation and the
rainfall is sudden and torrential, this chemical disintegration, as has
been already pointed out, is replaced by totally different kinds of
action. Under the influence of variations of temperature, having
an enormous range, the rocks made up of crystals having different
coefficients of expansion, in different minerals and indeed in different
directions in the same crystal, undergo mechanical disintegration, and
the fragments thus formed are driven backwards and forwards by
wind, being thereby subjected to constant attrition. Of this latter
kind of action, as we have seen, all the larger particles in the Nile
Delta deposits exhibit the most unmistakable evidence.

Hence we are led by an examination of the composition of the
Nile-water to the same conclusion as was reached by the study of
microscopical characters of the muds and sands of the delta, that
while in the rainy districts of the temperate zones, the disintegration
of rocks is mainly effected by chemical agencies, in the desert areas

220 Prof. J. W. Judd. [Nov. 19,

of the tropics the same work is almost exclusively effected by
mechanical forces.

The products of these two kinds of action are, however, essentially
different. In the former case we have produced crystals of kaolin,
which form the basis of all the true clays, a large quantity of lime-,
magnesia-, iron-, soda-, and potash-salts with silica passing into solu-
‘tion; while, in the latter case, the several minerals of the rock are
simply reduced to fragments of varying size and form.

All the observations described in the present report are in entire
harmony with this explanation. The comparatively unaltered con-
dition of the felspars and other complex silicates in the sands; the
absence of kaolin from the muds, and the presence of the chips and
flakes of the unattacked minerals in the muds, and finally the small
quantity of dissolved matter in the Nile-water, in spite of the enormous
concentration it must have undergone by evaporation—all point to
this same conclusion.

In the estimates which have been made of the rate of subaerial
denudation in different parts of the globe, it has usually been assumed
that this action is similar to what is seen taking place in Europe and
in North America. But the observations detailed in this report prove
that in tropical districts, where little or no vegetation exists, and the
rainfall is sudden and torrential, the disintegration of rocks, though
not, perhaps, less rapid than in temperate climes, is different alike in
its origin and in its products.

It has often been pointed out by chemical geologists, that metamor-
phic action could not have produced many of the schists and gneisses
from sedimentary rocks, for the former are rich in potash, soda, and
other materials which have been dissolved out from the latter during
the disintegration of the rock-masses from which they were derived.
The recognition of a kind of action whereby great masses of sedi-
mentary materials can be produced, rich in those substances which
are usually removed in a state of solution, is not destitute of mterest
at the present time, when the question of the origin of the crystalline
schists and gneisses is one that presses for solution.

Appendix.

Examination of the Samples obtained during the Recent Borings in
Egypt.

Portions of the several samples, varying in weight from 8 to
18 grams, were dried at 110° C., and then weighed. These portions
were, by careful levigation, separated into mud and sand, which being
dried at 110°C. and weighed, afforded the necessary data for calcu-
lating the percentage composition of each sample.

One specimen of each sample of sand thus obtained was mounted

1885.]. Report on the Deposits of the Nile Delta. 221

dry for study by reflected light; a second specimen from each was
mounted in Canada-balsam, so as to allow of the internal structure
and optical properties of the sand-grains being studied.

The fine particles composing the several samples of mud were so
mounted as to be capable of examination by transmitted light, with
the highest powers of the microscope.

The results obtained in the case of each sample were as follows :—

I. Boring at Kasr-el-Nil, Cairo.
Samete 1. Depth, 6 ft.

Loam of a dark reddish-brown colour. Contains 5:77 per cent.
sand, 94°33 per cent. mud.

Sand.—Dark coloured ; includes fragments of red brick, green glass,
straw, rootlets, and other vegetable matters. Rounded grains of
white quartz, evidently derived from granitic rocks, with a few of
jasper and rose-quartz; angular or subangular grains of quartz,
hornblende, &c., with many of fine-grained, impure sandstone.

Mud.—Much vegetable matter, with frustules of diatoms. Minute
chips and flakes of quartz and other minerals, with plates of biotite.

SamprtE 2. Depth, 16 ft.

Very sandy loam, of pale reddish-brown tint. Contains 86°27 per
cent. sand, and 13°73 per cent. mud.

Sand, composed of about equal portions of well-rounded and angu-
lar or subangular grains. It is of a white or slightly yellowish tint.
The rounded grains consist of white (granitic) quartz, rose-quartz,
and red, brown, and black jasper; with pebbles of slightly kaolinised
orthoclase felspar. The angular and subangular grains consist of
quartz, felspar, hornblende, sphene, and magnetite.

Mud.—Appears to be largely made up of chips and folees, of the
above minerals with biotite.

Sampte 3. Depth, 17 ft. 6 in.
Very sandy loam. Consists of 79°65 per cent. sand, 20°35 per cent.

mud.

Sand.—Very similar to last sample, but the well-rounded grains
are fewer, and the angular and subangular ones more numerous.
The latter consist of quartz, orthoclase, plagioclase-felspar (rare),
hornblende, augite; also black and brown jasper.

Mud.—Similar to last sample.

SameLE 4. Depth, 38 ft. 6 in.

Sandy loam. Consists of 65:05 per cent. sand, and 34°95 per cent.
mud.

222 Prof. JW -dudd. [Nov. 19,

Sand.—Mostly angular or subangular. Only a few well-rounded
grains. Consists of quartz (granitic), with a few particles derived
from metamorphic rocks. Microcline and orthoclase, but only
very slightly kaolinised; plagioclase-felspar, hornblende, augite (?),
sphene (?), magnetite ; with red, brown, and black jasper.

Mud.—As in last.

SamptE 5. Depth, 40 ft. 6 in.
Sandy loam. Consists of 80°83 per cent. sand, 19°17 per cent.

mud.

Sand.—Consists of about equal proportions of rounded and of
angular or subangular grains. The materials are quartz, with fine
inclusions of rutile, apatite (?), &c., with bands of liquid and gas
cavities, microcline and orthoclase (slightly kaolinised), plagioclase-
felspar, hornblende, red, brown, and black jasper, glauconite (?)
grains. |

Mud.—As in last.

SampLe 6. Depth, 45 ft.

Sandy loam. Consists of 68°72 per cent. sand, 31:28 per cent.
mud. .

Sand.—The angular and subangular particles prependerate over
the rounded ones. The minerals represented are quartz (granitic),
with hair-like inclusions (rutile), quartz of metamorphic origin,
microcline and orthoclase (slightly kaolinised), plagioclase-felspar,
hornblende, and biotite. Also red, black, brown, and green jasper.

Mud.—As in last. :

II. Boring at Kafr-ez-Zayat.
SampLe 1. Depth, 3 ft.

Mould of yellowish-brown colour. Consists of 2°35 per cent. sand,
and 97°65 mud.

Sand.—Mostly angular or subangular, but a few well-rounded
grains present. Consists of grains of quartz (granitic), with many
acicular crystals inclosed, and bands of cavities. Fragments of
hornblende abound. Orthoclase and a little plagioclase-felspar,
jasper, and small calcareous concretions. Vegetable matter.

Mud.—Contains much organic matter. Frustules of diatoms.

SampLe 2. Depth, 4 ft.

Light coloured, sandy loam. Consists of 30°42 per cent. sand,
69°58 per cent. mud.

Sand.—About an equal admixture of rounded with angular or

1885.] Report on the Deposits of the Nile Delta. 223:

subangular grains. Consists of the usual minerals, but mica (biotite)
in thin brown plates occurs in tolerable abundance.
Mud.—Presenting the usual characters.

SampLe 3. Depth, 11 ft.

Pale coloured, very sandy loam. Consists of 50°99 per cent. sand,
49-01 per cent. mud.

Sand.—Mostly angular or subangular, with a few well-rounded
grains. The usual minerals, with smoky quartz, tourmaline, and
‘sphene (?). Fragments of silicified wood.

Mud.—Presents the usual characters.

SampLe 4. Depth, 19 ft.

Coarse sand of ash-grey colour. Consists of 87°41 per cent. sand,
and 12°59 per cent. mud.

Sand.—For the most part made up of large, well-rounded grains,
nearly all of which are colourless quartz (granitic), with a few of
jasper and felspar (including orthoclase, microcline, and plagioclase).
Also a few calcareous concretions. The smaller sand grains are some-’
times angular, and sometimes subangular; they consist of the usual
minerals, including both hornblende and mica.

Mud.—Consists almost entirely of inorganic particles.

Sampite 5. Depth, 26 ft.

Very coarse, nearly white sand. Consists of 90°19 per cent. sand,
9-81 per cent. mud.

Sand.—The coarser grains are nearly all well-rounded, and are, in
fact, converted into beautiful pebbles. These larger grains are
usually quartz (granitic), but well-rounded fragments of hornblende
and felspar also occur, with red, yellow, and brown jasper by no
means rarely. The smaller grains, which are usually angular or sub-
angular, include a greater variety of materials.

Mud.—Composed almost wholly of mineral particles.

Sampre 6. Depth, 35 ft.

Sand similar to last, but finer grained. Consists of 86°42 per cent.
sand, 13°58 per cent. mud.

Sand.—The coarser particles usually well-rounded and composed of
quartz (granitic), with numerous and large liquid inclusions, with a
little felspar and hornblende. ‘There occurred in this sample a
calcareous fragment which appeared to be the nucleus of an Ammonites
(Jurassic ?). The finer sand, which is angular or subangular, consists
of the usual minerals, the quartz of metamorphic rocks being
commoner than is usually the case,

Mud.—Of usual character.

VOL. XXXIX. Q

224 Prof. J. W. Judd. [Nov. 19,

SampLe 7. Depth, 40 ft.

Dark coloured sand. Consists of 81°94 per cent. sand, and 18-06
per cent. mud.

Sand.—Composed of very different sized particles; the coarser
being nearly always well-rounded pebbles of colourless quartz, with
some jasper. A large proportion of the finer sand-grains in this
sample are also well rounded.

Mud.—Of usual character.

Sampte 8. Depth, 48 ft.

Lighter coloured sand. Consists of 87°23 per cent. sand, and 12°77
per cent. mud.

Sand.—Varies greatly in coarseness, many of the smaller grains
being well rounded. The rounded grains are almost all colourless
quartz (granitic), but smoky quartz, rose-quartz, citrine, and jasper,
are not rare. The finer sand consists of the usual minerals.

Mud.—Usual characters.

Sampite 9. Depth, 55 ft.

Dark coloured mud. Consists of 0°25 per cent. sand, and 99°75
per cent. clay.

Sand.—Fine grained, and composed in great dat of calcareous
concretions of the muddy particles. Most of the other grains are
angular, and consist of the usual minerals; well-rounded quartz
grains are very rare in this sample.

Mud.—Consisting of coarser particles than usual, is seen to be made
up of quartz, felspar, hornblende, and mica fragments, and kaolin
particles are rare.

SampLte 10. Depth, 60 ft.

Dark coloured sand, clay, or mud. Consists of 12°60 per cent.
sand, and 87°40 per cent. mud.

Sand.—Mostly well-rounded grains of quartz, with hornblende and
calcareous concretions by no means rare. Grains of black carbonised
vegetable matter.

Mud.—Contains much organic matter and some kaolin particles,
with the same mineral fragments as in the last sample.

SampLe 11. Depth, 66 ft.

Dark coloured very sandy clay. Consists of 62°07 per cent. sand,
and 37°93 per cent. mud.

Sand.—Mostly fine grained, and the particles generally angular. A
few well-rounded quartz-particles; plagioclase and orthoclase felspar,
hornblende, &c., also occur. Several angular and subangular frag-

-

1885, ] Report on the Deposits of the Nile Delta. 225

ments of a clear glass exhibiting strain-phenomena by polarised light
—probably of artificial origin.

Mud.—Almost wholly composed of very fine-grained, inorganic
particles.

; Sampie 12. Depth, 75 ft.

Lighter coloured, sandy clay. Consists of 66°38 per cent. sand, and
36°62 per cent. mud.

Sand.—Of very different degrees of dereta, the coarser grains
being nearly all well rounded. The usual minerals are seen, including
very fine microcline and large pieces of muscovite.

Mud.—Consists of inorganic particles, none very fine. Quartz,
felspar, and hornblende can be recognised among the larger ones.

Til. Boring at Tantah.
SameLe 1. Depth, 4 ft.

Dark coloured mould, Consists of 1°71 per cent. sand, and 98°29
per cent. mud.

Sand.—Generally angular or subangular, with some rounded
grains. Many fragments of brick, and some splinters of green, glass.
Many calcareous concretions. Much carbonaceous matter.

Mud.—Consists principally of organic matter, with some mineral
fragments,

SampLe 2. Depth, 8 ft. 6 in.

Hard brown clay. Consists of 7:27 per cent. sand, and 92°73 per
cent. mud.

Sand.—Contains both coarse, rounded grains and finer, angular or
subangular ones. Quartz, hornblende, and the other minerals usually
present are represented. Pale coloured granular calcareous particles.
Dark coloured argillo-calcareous particles (like those represented on a
large scale at greater depths).

Mud.—Generally very fine grained, with some organic particles.

Sampie 3. Depth, 18 ft.

Hard brownish clay. Consists of 8°78 per cent. sand, and 91:22
per cent. mud.

Sand.—Made up of granular calcareous particles, with only a few
grains of sand, rounded or angular, consisting of quartz and the usual
minerals. One fragment of red brick, and a number of particles of
black slag, full of bubbles (resembling slag of Roman iron-furnaces).

Mud.—Contains some coarse particles of different minerals.

92

226 | Prof. J. W. Judd. 3 Nowe ae.

SAMPLE 4. Depth, 22 ft. 6 in.

Dark coloured loam. Consists of 31°56 per cent. sand, and 68°44
per cent. mud.

Sand.—Consists of an admixture of rounded subangular and
angular grains of the usual minerals. A smaller admixture of cal-
careous particles of both types.

Mud.—Consists largely of fine fragments of the usual minerals.

SampLe 5. Depth, 31 ft.

Dark coloured sandy loam. Consists of 39°43 per cent. sand, and
60°57 per cent. mud.

Sand.—Made up of fine-grained materials, in which subangular
fragments predominate; they consist of the usual minerals, with a
few light coloured calcareous concretions.

Mud.—Consists of coarse particles of the usual minerals.

SamMPLe 6. Depth, 40 ft.
Dark coloured sand. Consists of 80°70 per cent. sand, and 19°30

per cent. mud.

Sand.—Much coarser than usual, the particles mostly well rounded ;
they may be called, indeed, quartz pebbles. The usual minerals are
represented, with the addition of zircon and enstatite (?). nes 28
concretions and a derived fossil (obscure).

Mud.—Very fine grained.

Sampte 7. Depth, 46 ft.

Lighter coloured very coarse sand. Consists of 95°90 per cent.
sand, 4°10 per cent. mud.

Sand.—Made up of coarse grains, all well rounded and polished.
Milky quartz and amethyst recognised. Only a small qnantity of
angular and subangulur fragments. Calcareous concretions present.

Mud.—Very fine grained.

SAMPLE 8. Depth, 55 ft.

Very coarse sand. Consists of 97°71 per cent. sand, and 2°29 per
cent. mud.

Sand.—Made up of coarse particles of different iarmerale, all well
reunded ; some angular fragments of limestone. Among the rounded |
particles the following minerals were detected: colourless (granitic)
quartz, citrine, jasper, milky and rose quartz, iolite (cordierite),
tourmaline, nephrite (?).

Mud.—Small in quantity, and very fine grained.

1885.] . Report on the Deposits of the Nile Delta. a 2)

SAMPLE 9. Depth, 56 ft.

Excessively coarse-grained sand. Consists of 9953 per cent. sand,
and 0°47 per cent. mud.

Sand.—Made up of large well-rounded grains of quartz of all
colours, with jasper, &c. Angular fragments of limestone of a
tufaceous character of considerable size. Fluorspar. One piece of
jade which did not show signs of being worked.

Mud.—Very fine grained.

Sampre 10. Depth, 58 ft.

Reddish-brown sandy loam. Consists ‘of 59:09 per cent. sand, ind
40°91 per cent. mud.

Sand.—Coarse well-rounded particles, with an admixture of angular
ones. Among rounded particles, several of jade. Other minerals as
usual, with black jasper or Lydian stone, tourmaline, fluorspar.
Angular fragments of tufaceous limestone, containing sand grains.

Mud.—Very fine grained, with some organic matter.

SameteE 11. Depth, 68 ft.

Hard reddish-brown clay, with some calcareo-argillaceous con-
cretions. Consists of 7°76 per cent. sand, and 92°24 per cent. mud.
Sand.—Admixture of large well-rounded particles of quartz and
smaller subangular ones of different minerals, with irregular calcareo-
argillaceous grains.
Mud.—Made up of coarse particles of different minerals.

SampLe 12. Depth, 73 ft.

Ash-grey sandy loam. Consists of 69°95 per cent. sand, and 40:05
per cent. clay.

Sand.—Rather fine, and mostly halen or angular, with some
large and well-rounded grains. The usual minerals are present,
including amethyst and milky quartz.

Mud.— Rather coarse grained, and consisting of recognisable
mineral particles.

The samples, with the preparations made from them, have, by the
desire of the Delta Committee of the Royal Society, been deposited

in the British Museum, Natural History, Cromwell Road, South
Kensington,

228 On Evaporation and Dissociation. [Nov. 19,

IV. “On Evaporation and Dissociation. Part I.” By Professor
WiLLIAM Ramsay, Ph.D., and SypNEY Youne, D.Sc.,
Lecturer and Demonstrator of Chemistry im University
College, Bristol. Communicated by Professor STOK&s,
Sec. B.S. Received August 4, 1885.

(Abstract. )

The authors describe experiments made with the object of ascer-
taining whether the coincidence of the curves which represent the
vapour-pressures of stable solid and liquid substances at different
temperatures, with those indicating the maximum temperatures
attainable by ‘the same substances at different pressures, when
evaporating with a free surface, holds good also for bodies which
dissociate in their passage to the gaseous state. The substances
examined were chloral hydrate, chloral methyl, and ethyl alcoholates,
butyl chloral hydrate, ammonium carbonate, ammonium chloride,
aldehyde ammonia, phthalic acid, succinic acid, nitric peroxide, and
acetic acid. |

These substances fall into two classes, the first including bodies
giving coincident curves, viz., nitric peroxide, ammonium chloride,
und acetic acid, the second containing the remaining substances,
which do not show such coincidence. Comparing the members of the
second class with each other as regards temperatures of volatilisation,
it is found that in those cases in which dissociation is complete, or
nearly so, the temperatures of volatilisation are independent of pres-
sure and do not form a curve. When dissociation is less complete, as
with suceinic and phthalic acids, a rudimentary curve is observable,
and with aldehyde ammonia, which is much more stable, the tempera-
tures of volatilisation form a regular curve resembling a vapour-
pressure curve.

All those substances, however, give curves representing pressures
of disseciation, generally similar in form to vapour-pressure curves,
and a comparison of these curves with those representing tempera-
tures of volatilisation would indicate that the smaller the amount of
dissociation the nearer the curves approach each other both in form
and position.

It is noticeable that in the formation of bodies of the second class
a molecule of water or ammonia is invariably broken down, whereas
with nitric peroxide and acetic acid direct union of like molecules
takes place, and there is no such rupture as in the previous cases.
As ammonium chloride resembles these substances in the likeness of
their behaviour to that of stable solids and liquids, it may perhaps be

1885.] Stimulation of the Tentacles of Drosera dichotoma. 229

conjectured that the molecule of hydrogen chloride is not broken
down in its union with ammonia to form ammonium chloride. Should
this conjecture not be accepted as correct, it will be necessary to seek
for an explanation of the phenomena observed by some relations yet
to be discovered.

V. “On the Phenomena accompanying Stimulation of the
Gland-Cells in the Tentacles of Drosera dichotoma.’ By
WALTER GARDINER, M.A., Fellow of Clare College,
Cambridge, Demonstrator of Botany in the University.
Communicated by Professor M. Foster, Sec. R.S. Re-
ceived September 5, 1880.

(Preliminary Communication.)

Method of Research.—Pieces of unstimulated leaves, and of leaves
stimulated for periods varying from 5 minutes to 72 hours, were
examined fresh, or after treatment with alcohol, picric acid, chromic
acid, or osmic acid. The most satisfactory results were obtained
from specimens treated for 12 hours with 1 and 2 per cent. chromic
acid; such strengths dissolving the tannin precipitate first formed,
and fixing the structures most successfully. The leaves were fed
principally upon small flies or pieces of frog muscle, since these were
found to succeed best. Heat stimuli, electrical stimuli, and stimulus
produced by contact or.cutting were also employed.

General Histology.—As regards the general histology of the ten-
tacles, one may notice that the gland-cells of the head are provided
with delicate uncuticularised cell-walls, which are remarkably pitted
on their upper or free surfaces; that the rest of the epidermal cells
of the tentacles have their exterior walls excessively cuticularised and
resistant, and that their radial longitudinal walls are freely pitted.

Structure of the Resting Gland-Cells.—In the typical resting gland-
cell, the protoplasm is arranged in a network or reticulum. The
meshes of this reticulum are excessively close around the nucleus,
which is situated at the base of the cell, but towards the free surface
they are much more open; the close and more open arrangement
merging the one into the other. The meshwork extends through the
whole of the cell cavity, and the interstices between the meshes are
occupied by the pink cell sap; the whole being bounded by the
ectoplasm. The gland-cells at the base of the head differ somewhat
in structure from the more apical.cells, as also do all the cells of the
short stalked teutacles which are situated at the centre of the leaf.
In neither of the three layers of cells covering the tracheidal cells of
the head could any obvious movement of the protoplasm be detected,

230 Mr. W. Gardiner. On the Gland-Cells [Nov. 19,

The epidermal cells of the stalk of the tentacles possess in the
resting condition the following structure. In each cell there is a
lenticular nucleus, and chlorophyll grains are present on the side of
the wall next the vascular bundle. These structures are situated in the
ectoplasm, and take no part in the movement of rotation. In addi-
tion to these a body, which is usually spindle-shaped or acicular, is
present in the cell, and generally occupies such a position that it
stretches diagonally across the cell from end to end, the two ex-
tremities being embedded in the cell protoplasm. I shall speak of
this body at present as the plastoid, on account of certain resem-
blances it bears as regards its microchemical reactions to plastids.
This name may possibly, however, not be retained. The plastoid is
fixed to some extent by absolute alcohol or chromic acid. With dilute
alcohol it swells up and disappears. With iodine it becomes dis-
organised and spherical. It is best fixed by watery picric acid, and
stains very readily and at once with Hofmann’s blue. In the resting
stage the plastoid takes no part in the movements of the rotating
endoplasm. It is present in all the epidermal cells of the leaf except
the gland-cells and the cells immediately beneath the same, and in the
bending portion of those tentacles which execute movements, it is very
large in the cells of the convex, and very small or even apparently absent
in those of the concave side. In Dionea it also occurs, being large
in the cells of the upper surface of the leaf, and very small in those of
the under. The cells themselves of the under surface in Dionza and
of the concave side in Drosera are also smaller than the others of the
opposite side. The protoplasm of the tentacle cells is very clear
and hyaline, and the whole protoplasmic utricle is thin and closely
pressed against the cell-wall.

Changes in the Gland-Cells during Secretion.—The cells may be made
to secrete by the combined stimulus of heat and moisture, by direct
contact, or by electrical stimulus, but especially by the stimulus of
food applied to the gland.

The histological changes which occur are the following. After
some time (24 hours) a gland mounted in water exhibits a mottled
appearance, such mottling being caused by a vacuolation of the most
peripheral portions of the protoplasm of the gland-cells. In section
such a cell shows, that in the course of secretion there has been a using
up of the cell contents, and instead of the meshwork occupying the
whole of the peripheral portion of the cell, so as to give a fairly homo-
geneous appearance, large spherical cavities have appeared in the
reticulum here and there: such cavities being occupied by the cell sap.
‘The sap has, moreover, assumed a much darker pink tint, Thus a
breaking down or destruction of some part of the reticulum has taken
place. After some 72 hours’ stimulation this breaking down of the
reticulum has reached tosuch an extent that in the peripheral portion

1885. | in the Tentacles of Drosera dichotoma. 231

before referred to, all the central core of the meshwork has for the
most part disappeared, and replacing it is a single large vacuole filled
with cellsap. The ectoplasm has moreover contracted from the upper
or free surface of the cell-wall. In no case does this destruction
and consequent vacuolation extend to the base of the gland-cells
where the nucleus is situated. The nucleus is always surrounded
by dense protoplasm; and there are grounds for believing that
after very long stimulation, when all the secretion has been poured
out, and before absorption begins, an active growth of protoplasm
takes place around the nucleus and in the more basal portion
of the cell. In certain cases the secretion can be seen under the
microscope to escape in drops—apparently through the pitted
portions of the cell-wall—and the drops rapidly taking up water
and being forced outwards, assume a rod-like form, and present a
halo-like appearance around the gland. This: also occurs in the
mucilage-secreting cells of the bladders of Utricularia. The exact
part taken by the layer of cells beneath the gland-cells has yet to
be determined. After stimulation their vacuoles are occupied by
large drops of cell sap, which is of a purple or even black colour.

The view here taken (which is supported by certain of the staining
reactions) with regard to secretion is, that in the gland-cells the
mere peripheral network consists of protoplasm, together with some
formed substance derived from it, and that the outpouring of the
secretion is caused by the repeated breaking down (owing to stimula-
tion) of the protoplasm into this formed substance, which is of a
mucous nature, and which rapidly attracts water and so escapes, as
the secretion to the external surface.

Changes in the Stalk Cells—The chief phenomena induced in the
stalk cells either by contact by electrical stimulus or by feeding are,
that the protoplasmic utricle swells up and encroaches on its own
vacuole, that granules rapidly appear in the protoplasm, and that the
movements of rotation increase in vigour. Also the cell becomes less
turgid, and after long stimulation the plastoid and the nucleus both
tend to become spherical. These changes are most markedly exhi-
bited in tentacles stimulated with food. The protoplasm in swelling
up abstracts water from its own vacuole, and in so doing leaves the
tannin in the sap, in a comparatively concentrated condition. The
outlines of the protoplasmic utricle are now rendered clearer than
before. As previously stated, the movements of rotation become
quickened very considerably, and numerous waves with high crests
appear on the surface of the protoplasmic utricle, and are well
registered by the corresponding disturbances in the cell sap. The
phenomenon of the protoplasmic waves breaking over the nucleus with
erests reaching nearly across the vacuole is very remarkable. The
‘long and narrow shape of the cells, and the combined swelling of the

232 Mr. W. Gardiner. On the Gland-Cells [Nov. 19,

protoplasm, increase of rate of rotation and wave movements, cause
the cell sap to be so disturbed, and as it were churned up, that drops
of the sap become cut off from the main mass, and at last the whole
of the sap is separated into numerous distinct portions which are
suspended in the protoplasm as oily drops, and are carried round in
the currents, presenting the appearance of moving droplets, pear-
shaped bodies, and long string-like processes. The cell in this con-
dition was known to Darwin as “aggregated.” When movement
ceases, as often naturally occurs, owing to excessive secretion, or can
be induced by suddenly crushing the tentacle head, the variously
shaped masses become spherical, and lie quiescent in the protoplasm.
The aggregation produced by the action of ammonic carbonate is
somewhat different from that brought about by feeding, and may be
spoken of as passive as opposed ito active aggregation. In this case
the protoplasm abstracts water from the vacuole in the usual way,
and, steadily swelling, chops up the tannin-loaded sap of the long and
narrow cells into separate globules. The rotatory movements cause
these globules to alter their form, but the movements in question are
nothing like so vigorous as in the food-stimulated gland, and the
globules are rarely, if ever, carried bodily about.

When the protoplasm swells and the cell becomes aggregated, the
latter always loses its turgidity, and the state of aggregation is
accompanied by a loss of water. Injection of water into the tissue
will at once stop aggregation and restore the cell to its normal condi-
tion. Sometimes after active secretion (48 hours), the movements of
the protoplasm of the topmost tentacle stalk.cells will stop, and much
of the protoplasm of each cell now collects to the end of the cell
nearest the gland. Mounting in water will then restore the move-
ments. It was found experimentally that the collecting of the proto-
plasm to one end was occasioned by the upward passage of water to
the gland. If a passage of water be set up in an opposite direction,
then the protoplasm collects to the opposite end.

When the more rapid movements of the protoplasm commence
owing to stimulation, the plastoid usually becomes bent, and then
either contracts and assumes a lenticular form, or becomes separated
into two or more pieces each of which becomes lenticular. Later on
further contraction ensues, and the plastoid is.carried round the cell
in the protoplasmic stream. 'The,more the cells lose their turgidity,
the more does the plastoid tend to assume a spherical form. Its
spindle-shaped elongated form may, however, be restored by again
bringing about turgidity, e.g., by injection of water into the tissue. —
Thus the plastoid may be regarded as a turgometer, since it indicates
the state of turgidity of the cell. On account of certain experiments
and observations the author is led to believe that all differences of
turgidity in cells are brought about by the protoplasm swelling and

1885. | in the Tentacles of Drosera dichotoma. 233

becoming porous, and that the method of establishing a loss of
turgidity by solutions of neutral salts and the like involves a state of
things essentially different from that which normally occurs. In
the one case the protoplasm itself undergoes change. In the other
the cell sap is violently abstracted by artificial means from the
vacuole of a protoplasmic utricle which is endeavouring to protect
itself from the action of the reagent.

Movements of the tentacles may be brought about by direct contact
and by cutting or injury, by electric stimulus, by the addition or
withdrawal of water, and especially by the stimulus of food. In
all these cases the stimulant upsets ‘the existing equilibrium and
brings about a difference of turgidity on the two opposite sides. Loss
of water by plasmolysis usually induces movement, unless the salts
employed have a specific action upon the protoplasm. Movement
may occur without aggregation, and secretion may occur without
movement, bat whenever well-defined aggregation takes place, move-
ment always follows. Different strengths of the same reagent may
bring about different reactions. Thus a 01 per cent. solution of
chromic acid causes both movement and secretion, while with a
1 or 2 per cent. solution neither phenomenon occurs. Among the
curious effects of various salt solutions that of ammonic chloride may be
noted, in that it acts markedly as a sedative, toning down aggregation
and restoring turgidity. It was very generally noticed that the ten-
tacles before becoming inflected, moved downwards and backwards,
_and that the upward and inflected movement subsequently took place.
When a tentacle has become well inflected it can be observed that at
the bending point the cells of the convex side are very turgid, with their
plastoids spindle shaped, and that little or no aggregation has taken
place, while in the cells of the concave side, on the other hand, there is
well-marked aggregation and loss of turgidity ; the aggregation after a
time extends to the convex side, the cells of which, in their turn, lose
their turgidity, and at this stage all :the cells are flaccid. Later on”
the cells of the concave side first regain their turgidity, and now the
tentacle is bent back toits original position before stimulation. From
certain observations on Dionza and Mimosa, the author is led to
believe that there also movement.is made possible by the establishing
of sudden and different conditions of turgidity of different cells, such
differences being occasioned by the induced porosity of the protoplasm
of certain of these cells. These phenomena occur perhaps in all cases
of movement.

The plastoid markedly decreases in size after long stimulation
in both Dionza and Drosera. There are therefore some grounds for
believing that it consists mainly of some reserve material or some
substance which is used up during secretion. Whether the crystal-
loids in the nucleus of Pinguicula serve a similar purpose remains to

234 Mr. J. N. Langley. Variations of — —_[Nov. 19,

be seen, for at any rate a plastoid is not present. A somewhat casual
examination was also made of many organs of movement, but in them
no plastoid was observed. In Drosera rotundifolia and other species
plastoids occur which resemble those of Drosera dichotoma. Strong
single induction shocks or tetanising currents cause the plastoid to
assume the spherical condition, or very frequently to break up into a
string of small spheres. A sudden blow on the cover slip also causes
the assumption of the spherical form.. Moderately strong tetanising
shocks cause swelling of the protoplasm, and increase of rapidity of
movement and granularity. Very strong shocks may cause the con-
traction of the primordial utricle from the cell-wall at certain small
areas, but immediate death always ensues, since the stimulus required
is abnormally great. The normal effect of a regulated stimulus is to
induce a swelling of the protoplasm and a loss of turgidity, and in
consequence of the unequal reaction of the various cells to such a
stimulus, movement of the tentacle also occurs,

[ Norzr.—I have decided to name the body which I have provision-
ally spoken of as the plastoid “the rabdoid”’ (Gk. rabdos, a stick or
wand). The change in form of the rabdoid appears to be a con-
sequence of the molecular changes in the protoplasm. Differences of
turgidity are among the results of these changes.—Noy. 28, 1885. ]

VI. “On Variations in the Amount and Distribution of Fat in
the Liver-Cells of the Frog.” By J. N. Laneuey, M.A.,
F.R.S., Lecturer on Histology in the University of Cam-
bridge. Received September 23, 1885.

I have in a previous paper* mentioned some of the changes which
occur in certain circumstances in the number and arrangement of the
fat-globules in the liver-cells of the frog. From observations made
since that time at different seasons of the year, I have been able to
ascertain certain points undetermined in the previous account.

Variations in the Amount and Distribution of Fat with the tume of
Year.—The fat in the liver-cells is at its maximum amount in Feb-
ruary and March. In January it is, as a rule, somewhat less. In
April it rapidly decreases ; from May until December it is present m
comparatively small though varying amount, It is usually present
in minimum amount in September and October.

Generally speaking, the fat-globules form an inner zone in frogs
which have hungered more than a week. Jn January, February, and
March, however, the fat-globules are commonly more numerous in
the outer part of the cells, often forming a distinct outer zone.

* “ Proc. Roy. Soc.,” vol. 34, p. 20,

1885.] —»- Fat in the Liver-Cells of the Frog. 235

Sometimes the globules stretch throughout the cells. In December,
the fat-clobules may be more numerous in the outer part of the cells,
but more commonly they are absent from the outer cell-region and
form an inner zone. At other times of the year also, the fat-globules
may be present in the outer portion of the cells, but this is com-
paratively rare.

From April to November, including those months, the globules
may be very few and small. In December this is, so far as I have
observed, very rare. In January, February, and March, I have
-always found fat-globules to be present in considerable number.

Hifect of Temperature—In December, when the fat in the liver is
increasing in amount, cold increases the amount of fat stored up, and
warmth decreases it.

The increase of fat, consequent on a decrease of temperature,
occurs chiefly in the outer part of the cells. The fat-globules which
are formed are fairly large.

The decrease of fat, consequent on increase of temperature, occurs
chiefly or wholly at the outer part of the cells; as a rule, the number
of globules in the inner part of the cells is increased. The decrease
in the amount of fat, whilst due in part to a decrease in the number
of fat-globules, is due to a still greater degree to their decrease in
size.

Although warmth lessens the amount of fat in the liver in winter-
frogs, it does not cause: the fat to disappear entirely. The effect
varies; in some frogs which have been kept seven to ten days at
22° C., the liver may still have considerably more fat than is ordinarily
present in the liver in summer-frogs.

In summer-frogs, in which the fat-globules form an inner zone, and
are nearly or entirely absent from the outer cell-region, neither
warmth nor cold affects to any great degree the number or position
of the fat-globules. They usually diminish somewhat in number and
size with increase of temperature, but this is not necessarily the case.
Variations of temperature have then much greater effect on the
amount of fat in the liver in winter than in summer, 7.e., whilst
in winter the ratio of fat formed to fat metabolised is greater
in the cold than in the warm, in summer this is not necessarily
the case.

Although summer-frogs have sometimes very little fat in the liver,
it is doubtful whether the smallness of the amount is due either to
the warmth of summer or to hunger, for we have seen that warmth does
not necessarily cause a disappearance of fat from the liver; and frogs
after long hunger have not infrequently a fair amount of liver-fat left.
Hence the ratio of fat formed to fat metabolised, depends in part upon
certain unknown conditions of the body, independent of temperature
or of food.

236 Mr. J. N. Langley. Variations of [Nov. 19,

Effect of Digestion—When frogs are fed, e.g., with worms, the fat
in the liver at first decreases, after some hours it begins to increase
and becomes greater than at the beginning of digestion; towards the
end of digestion it decreases again in amount, so that in one or two
days the amount is normal. Whilst the fat is decreasing in amount,
the globules usually decrease in size; whilst the fat is increasing in
amount, the globules usually increase: in size, and are found in the
outer region of the cells.. Later, as the fat returns to normal, the
globules form more and more an inner zone.

The extent of the changes just mentioned as occurring during
digestion, as well as the period of digestion at which they occur,
varies very considerably at different times of the year, and. in different
frogs. Winter-frogs which have before digestion much fat in the liver,
show a decrease and subsequent increase of fat during digestion, but
the increase is commonly not more than sufficient to bring the fat
up to the amount present before food was given.

In some cases in summer-frogs, especially in September and Octo-
ber, the effect of feeding is very slight. There are also. certain
differences in the distribution of the fat-globules in different frogs, in
the several stages of digestion. Usually when there are many fat-
globules present in the outer part of the cells before digestion, they
increase in number during the first stage of digestion in the iner
part of the cells; but this is not always the case, whilst disappearing
from all parts of the cell, they may disappear much more rapidly from
the inner than from the outer cell-region..

Further, when fat-globules are present in the inner zone only, it
may happen that, although they increase somewhat in number in the
cells in the later stages of digestion, they do not accumulate in the
outer cell-region, but are sparsely scattered in the outer cell-region,
and are more numerous in the inner cell-region.

Probably these differences are to be accounted for in the following
way.

We have seen that when fat is present in considerable amount,
it is present almost without exception in greater quantity in the outer
than in the inner part of the cells, and that in most cases, as it is
increasing in amount, whether from decrease of temperature, or from
digestion, it increases in the outer part of the cells, frequently being
found close to the basement membrane. Hence we may conclude,
that fat is formed more rapidly in the outer than in the inner part of
the liver-cells.

We have seen that when winter frogs are kept in the warm, it is in
the outer portion of the cells that the fat chiefly disappears, and that
in summer-frogs, fat is rarely found except in the inner cell-region.
Hence probably the metabolism as well as the formation of fat is more
rapid in the outer than in the inner cell-region.

1885.] Fat in the Liver-Cells of the Frog. 237

_ Further we have seen that in winter-frogs kept in the warm, and in
fed winter-frogs, there is commonly an increase in the number of
fat-globules in the inner zone although the total amount of fat is
much diminished. Hence probably there is in certain circumstances
a transference of fat-globules from the outer to the inner part of the
cells. The amount of fat present in the liver of course depends upon
the relative rates of formation and metabolism of fat, and as this varies
in different circumstances, so probably the rate of transference of fat
from the outer to the inner cell-region varies in different circum-
stances. To this the differences spoken of above are probably due.
In summer frogs for example, whilst in the later stages of digestion
fat is formed more rapidly im the outer cell-region, an accumulation
of fat in this region may not take place; partly on account of the more
rapid metabolism of the fat formed, and partly on account of its more
rapid transference to the inner’ cell-region.

Some of the fat-globules in the inner zone are no doubt passed out of
the cell with the bile secreted, for some small fat-globules are always
present in the bile.

One other conclusion we may draw with regard to the fat-globules:
since they diminish in size under the influence of warmth, and in the
first stage of digestion, it is probable that each separate fat-globule is
slowly metabolised in the same way that mesostate granules in
secretory glands are metabolised. The granules of the salivary
glands, of the gastric glands, of the pancreas, are not dissolved as a
whole during secretion, they are dissolved steadily and gradually.

The Hffect of Peptone and of Dextrin—From June to August,
peptone or dextrin, when injected into the dorsal lymph-sac of a frog,
produces changes like those produced by feeding; 2.e., there is at first
a decrease in the amount of fat in the liver, then an increase chiefly
in the outer part of the cells, and this is succeeded by a decrease to
the normal state, during which the fat-globules become shifted from
the outer to the inner cell-region. The increase of fat is usually
greater with dextrin than with peptone. As arule the increase in the
amount of fat takes place three to four hours after peptone has been
injected ; in twenty to thirty hours after the injection, the fat-globules
are present, as at starting, in the inner cell-region only. The times
at which the various changes take place vary, however, in different
frogs. If frogs are kept in the warm and peptone is injected, the
effect on the fat in the liver is much less than when the frogs are at
the ordinary temperatures. In September the effect of peptone
appears to be less than from June to August. In the winter months
I have not made a sufficient number of experiments to be certain what
changes peptone and dextrin then produce.

Sewall has pointed out that peptone injected into the dorsal sac of
a frog, causes, in one to two hours, the stomach to be distended with

238 List of Officers and Council. [Nov. 26,

fluid of a neutral or slightly acid reaction. This distension of the
stomach occurs in most but not in all cases. The fluid is, I find,
usually alkaline, sometimes both the mucous fluid in the stomach and
the stomach-wall itself are strongly alkaline. The fluid contains a
small amount of pepsin. Dextrin produces a similar but less.
distension of the stomach, the mucous fluid in this case is usually
acid. I may mention that digestion in the frog is delayed very
greatly by peptone, and slightly by dextrin. The stimulus set up by
the fluid in the stomach may have something to do with the changes
in the liver which follow injection of peptone or of dextrin. But
since the changes in the liver occur in the cases in which the injection
causes little or no formation of fluid in the stomach, I attribute them
in the main to the direct action of the substance injected. This I am
the more inclined to do since I find that both peptone and dextrin
cause in a few hours an accumulation of glycogen* in the liver in
summer-frogs.

November 26, 1885.
THE PRESIDENT in the Chair.

In pursuance of the Statutes, notice was given from the Chair of
the ensuing Anniversary Meeting, and the list of Officers and Council
nominated for election, was read as follows :—

President.—Professor George Gabriel Stokes, M.A., D.C.L., LL.D.
Treasurer.—John Evans, D.C.L., LL.D.

Professor Michael Foster, M.A., M.D.

Secretarzes.— | The Lord Rayleigh, M.A., D.C.L.

Foreign Secretary.—Professor Alexander William Williamson, LL.D. |

Other Members of the Council_—Professor Robert B. Clifton, M.A.,
Professor James Dewar, M.A.; Professor William Henry Flower,
LL.D.; Archibald Geikie, LL.D.; Sir Joseph D. Hooker, K.C.S.L;
Professor Thomas Henry Huxley, D.C.L., LL.D.; Admiral Sir A.
Cooper Key, G.C.B.; J. Norman Lockyer, F.R.A.S.; Professor
Henry N. Moseley, M.A.; Professor Bartholomew Price, M.A.;
Reverend Professor Pritchard, D.D., F.R.A.S.; William James
Russell, Ph.D.; Professor J. S. Burdon Sanderson, LL.D.; Professor -

* Seegen has shown that peptone increases the amount of sugar in the liver.

1885.] On the Fertilised Ovum of Peripatus. 239

Arthur Schuster, Ph.D.; Lieutenant-General R. Strachey, R.H.,
C.S.I.; General James Thomas Walker, C.B.

Surgeon-Major James Edward Tierney Aitchison (elected 1883)
was admitted into the Society.

The Presents received were laid on the table and thanks ordered
for them.

The following Papers were read :—

I. “On the Fertilised Ovum and Formation of the Layers of
the South African Peripatus.” By ADAM SEDGWICK, M.A.,
Fellow of Trinity College, Cambridge. Communicated by
Professor M. Foster, Sec. R.S. Received October 18,
‘1885.

The Fertilised Ovum and its Nucleus.

The fertilised ovum of Peripatus capensis contains a central cavity
traversed by a few strands of protoplasm.

The protoplasm has a reticular or spongy structure, the reticulum
being very close round the nucleus and much looser elsewhere. The
strands of the reticulum are composed of an apparently perfectly
homogeneous protoplasm. The nucleus is placed on one side of the
_ ovum; it is a large body which varies very considerably in shape and
structure in different ova. These variations no doubt represent
different: phases in the life-history of the nucleus. It has been
impossible for me with the small number (ten) of unsegmented ova
at my disposal to determine their sequence.

The nucleus of the fertilised ovum is, however, so large and
favourable for study that I have thought it worth while to describe
three different stages in which [ have seen it.

1. A spherical structure (diameter, 0°04 mm.) bounded by a mem-
brane, which is slightly mdented at one point, where it sends in a
prolongation of itself, which passes through the nucleus to become
continuous with the membrane of the opposite side. The nucleus is
made up of a fine spongework of very pale fibrils, which are continuous
with the nuclear membrane and with the septum just mentioned. In this
spongework are a number of deeply-staining more or less spherical
bodies. Thenuclear membrane and septum appear precisely similar in
structure to the strands of the external protoplasmic reticulum, and
the latter are continued directly into the former. The pale nuclear
reticulum is also similar to the extra-nuclear reticulum, differing only

VOL. XXXIX. _ R

240 Mr. A. Sedgwick. On the Fertilised | Nov. 26,

in intensity of staining. The deeply-staining bodies in the nucleus
are, I think, placed in the strands of the pale reticulum ; but of this
I am not certain.

This nucleus then consists of a simple spongework of protoplasm,
differing only from the external protoplasm in the fact that the stain-
ing matter is aggregated into small masses and into the septum
already mentioned. The apparent nuclear membrane is simply part of
the protoplasm at the junction of the modified (nuclear) and unmodi-
fied (cell-substance) part of the protoplasmic network.

2. A form closely resembling the above, except in the fact that the
nuclear spongework is stained slightly, though not quite so deeply as
some of the extra-nuclear protoplasm. There are only two small
deeply-staining masses, which are not so conspicuous as in the first
form.

We may state the difference between these two nuclei thus: in the
first form the chromatin of the nucleus is aggregated into a number
of small masses, while in the second form the chromatin is diffused
throughout the nuclear reticulum. The word chromatin being used
to denote the property which enables the protoplasm to take up and
retain the staining matter. The extra-nuclear protoplasmic threads
possess this property, and may be said to possess chromatin, but it is
in a diffused form, as in the second form of nucleus.

3. In the third form the nucleus is:divided by a number of septa,
radiating from its centre, into chambers. The chambers are partially
divided up into secondary chambers by prolongations of the septa.
The septa are continuous externally with the extra-nuclear proto-
plasmic reticulum. It is impossible to speak of a distinct boundary
of the nucleus in this form, and the substance of the nuclear septa
and their prolongations is exactly similar in appearance and staining
properties to the strands of the surrounding protoplasmic network or
spongework.

A number of chromatin masses occur in each chamber of this
radiate nucleus—they appear to lie in the offshoots of the septa into
the chambers and in delicate expansions of these. But it is impos-
sible to determine exactly the relation of these chromatin globules to
the protoplasmic network in the nucleus.

This form of nucleus is most interesting, because were it not for
the chromatin masses the nucleus would be quite undistingnishable
from the surrounding protoplasm, except, perhaps, by the fact that
the meshes of the network (1.e., network as seen in section) are rather
larger than in the protoplasm immediately around the nucleus.

The most important, and at the same time most certain, of these
observations on the nucleus of the fertilised ovum of Peripatus, is that
the intra-nuclear and extra-nuclear reticulum are both continuous
with the so-called nuclear membrane.

1885. ] Ovum of the South African Peripatus. 241

4. The last form I have to describe is the spindle form. It was met
with in an ovum of two segments.

The spindle is of enormous size (distance between the poles 0:06 mm. )..
The protoplasmic fibres composing it are absolutely the same in
appearance as the rest of the cell protoplasm. The chromatin is
present in a very condensed form (1.e., deeply staining) as a number:
of bent rods at the equator of the spindle. Around the poles of the-
spindle the protoplasmic reticulum is arranged in a radiate fashion.
The spindle appears not to be composed of simple fibres running from
pole to pole, but of the ordinary reticulum, the meshes of which are
very much elongated in a direction parallel to the long axis of the.
spindle.

The facts which are most clearly brought out by the above obser-
vations, and about which I have no doubt, are—

1. The continuity of the nuclear reticulum with the extra-nuclear.
reticulum in form 3 (and almost certainly in forms | and 2)..

2. The similarity in structure and continuity between the so-
called fibres of the spindle in form 4 with the surrounding reticulum ;
and the conclusion I have drawn from my observations is that the
nucleus of the fertilised ovum of Peripatus differs from the cell proto-
plasm only in the manner in which the so-called chromatin contained
in the protoplasmic meshwork (both of nucleus and rest of ovum)
behaves. In the nucleus it varies from a state of diffusion through
the reticulum to a state in which it is condensed into. the chromatin
masses of form 1.

In the subsequent stages of segmentation, the nucleus gradually
becomes smaller until at the close of segmentation it has an oval
form with a long diameter of 0°016 mm. It now presents the features
described by Flemming and other observers in the nuclei of the
salamander. I have seen all through the development of Peripatus
after segmentation most of the stages figured from the salamander.

During segmentation the nucleus generally has the third form above
described: I have never seen it in a spherical, and only once in a
spindle form. I conclude that these forms if they occur are very
rapidly passed through.

The Segmentation.

I have already described this in a general manner in my communi-
cation of May last, and with figures in the “ Quarterly Journal of
Microscopical Science” of July last.

I then stated that the endoderm cells were connected with each
other by processes (‘‘Quart. Journ. Micros. Sci.,” xxv, Plate 31,
fig. 8). I have now the following facts to add :—

1. The so-called endoderm cells are at first without a distinct
nucleus, they do not get a nucleus until just before the gastrula stage.

R 2

242 Mr. A. Sedgwick. On the Fertilised [Nov. 26,

2. All the cells of the ovum, ectodermal as well as endodermal, are
connected together by a fine protoplasmic reticulum which is
placed, as are also the cells, immediately beneath the ege membrane,
and therefore around a central space.

Kach-ectoderm cell consists of a central nucleus around which is a
close protoplasmic spongework, which at the outer parts of the so-
called cell becomes of a gradually looser nature until it runs into the
spongework of the surrounding cells.

Each endoderm mass consists of a central denser spongework which
gradually becomes looser towards the periphery of the mass until it is
continued into a fine reticulum. The endoderm masses are far apart
from each other and are connected by this reticulum.

The continuity of the various cells of the segmenting ovum is
primary and not secondary, 1.e., in the cleavage, the segments do not
completely separate from one another. But are we justified in speak-
ing of cells at all in this case? The fully segmented ovum is a
syncytium, and there are not and have not been at any stage cell limits.
I think the cleavage should be rather described not as segmentation,
but a multiplication of the nucleus or centre of force which causes a
corresponding readjustment in the density of the network at different
parts of the ovum, but no break in continuity.

The Structure of the Gastrula.

The formation of the gastrula, which is at first solid, has been
described in my first communication to the Society on this subject.

The endoderm masses at first, as I have already mentioned, have no
nuclei. Nuclei first appear in them during the progress of the epibole
by which the gastrula is formed. Ihave not been able to determine
the origin of these nuclei. They either arise de novo in the endoderm
masses or migrate into the latter from the ectoderm. The proto-
plasmic network at the centre of each endoderm mass is denser than
at the periphery, but is without the chromatin granules, so charac-
teristic of a nucleus. But I have already described a stage of the
nucleus in the fertilised unsegmented ovum in which the chromatin
granules are almost entirely absent, and in which the network pre-
sents no essential difference from the surrounding network. Again,
another in which the nuclear network merges so gradually into the
surrounding network, that it is impossible to point to any limit be-
tween them. I therefore think it quite possible that this central
denser protoplasm in the endoderm masses may give rise to the
nucleus which subsequently appears. But on the other hand I must
distinctly state that this is only a possible view which may be borne
in mind, but which cannot be accepted without the most overwhelm-
ing proof in the present state of our science.

The solid gastrula is a syncytium; the ectodermal nuclei are

1885. | Ovum of the South African Peripatus. 2A

arranged round the periphery of the ovum, while the endodermal
nuclei are within. The latter are characterised by their angular
shape, and by never presenting the karyokinetic figures characteristic:
of the ectodermal nuclei. The protoplasm of this syncytium is much
vacuolated throughout, but the vacuoles are largest im the centre.
These central vacuoles unite and give rise to the gut cavity, which
opens to the exterior through a point on the surface where the
ectodermal nuclei have always been absent. This opening is the
blastopore. The blastopore, until quite late in development, is.
traversed by protoplasmic strands, which anastomose with similar
strands projecting from the protoplasm lining the large central
vacuole or gut.

The gut of Peripatus arises, therefore, as a vacuole in a multi-
nucleated mass of protoplasm, and the gastrula of Peripatus is a multi-
nucleated mass or syncytium, with absolute continuity of the proto-
plasm of all parts of the ovum.

The Origin of the Mesoderm.

After the definite formation of the blastopore, an area of proto-
plasm, placed in the ectodermal layer of the syncytium, and charac-
terised by possessing several nuclei less densely packed together than
elsewhere, is distinctly visible in the middle line of the ventral surface
just behind the blastopore. I cannot be certain of the exact number
of the nuclei belonging to this area in the youngest embryo in
which I observed it, as the limits of the area are difficult to
determine by inspection of transverse sections. However that may
be, the: area has in transverse section very much the appearance of the
pole cells of other forms, and is the structure described in my first
paper as “some cells which cannot be definitely assigned to the
ectoderm or to the endoderm, at the hind end of the blastopore.”’ Its
nuclei undergo division and give rise to the densely packed mass of
nuclei of the primitive streak.* A part of it seems to persist for
some time in the deeper parts of the primitive streak close to the
endoderm: I have not yet succeeded in tracing the fate of this
portion.

The nuclei of the primitive streak migrate forwards between the
ectodermal and endodermal nuclei, and take up their position in the
protoplasm intervening between the latter.

These rows of nuclei are the mesodermal bands. They soon arrange
themselves into groups around a central vacuole, and so give rise to
the most conspicuous parts of the mesoblastic somites. I leave the
ovum for the present at the commencement of the formation of the
somites, merely stating that it is still a syncytium.

* Tt is possible that some of the ectoderm nuclei adjoining this area may take
part in the production ot the primitive streak nuclei.

'*’ STS yea
Bs eh

244 Mr. A. E. Shipley. On the Mesoblast [Nov. 26,

The facts above recorded are somewhat novel. That they are facts
so far as Peripatus capensis is concerned I have not the slightest
doubt. W-hether or no they are applicable to other animals is another
question. If they are, the following considerations present them-
selves :—

1, Klein’s view of the continuity between the reticulum of the
mucleus and ‘the reticulum of the extra-nuclear protoplasm receives
striking confirmation.

2. Metschnikoff’s and Lankester’s views as to the origin of the
gastrula and its gut receives support.

3. Herbert Spencer’s view of the origin of the nervous system may
perhaps not be so far from the mark as at first sight appeared.

4. The connexion between the nerve and muscles and sensory
epithelial cells receives its morphological explanation, being due to a
primitive centinuity which has never been broken. In fact the con-
nexion between almost every kind of tissue cell is explicable as
being the primitive condition.

5. There is no essential difference between ducts with perforated
cells and ducts with so-called cellular walls (inter- and intra-cellular
ducts). ;

6. If the protoplasm of the body is really a syncytium, and the
ovum until maturity in the ovary a part of that syncytium, the separa-
tion of the generative products does not differ essentially from the
internal gemmation of a protozoon, and the inheritance by the off-
spring of peculiarities first appearing in the parent, though not
explained, is rendered less mysterious, for the protoplasm of the
whole body being continuous, changes in the molecular constitution
of any part of it would naturally be expected to apres in time,
through the whole mass.

Stites these facts if generally applicable dee the adult body
to a syneytium—to a multi-nucleated vacuolated protoplasmic mass,
and embryonic development to a multiplication of nuclei and a
specialization of tracts in this mass.

IT. “On the Formation of the Mesoblast, and the Persistence
of the Blastopore in the Lamprey.” By ARTHUR E.
SHIPLEY, B.A. Communicated by Professor M. FOstTER,
Sec. B.S. Received October 29, 1885. |

At the close of segmentation the egg of the Lamprey (Petromyzon
planert) forms a blastosphere. Owing to the way in which the yolk
is distributed, the segmentation cavity is rather eccentrically placed.
It is roofed in by several rows of small cells, while its floor is com-
posed of-a few very large cells much crowded with food yolk. The

1885.1] and Blastopore of the Lamprey. 245

small cells pass gradually into the larger ones at the sides of the seg-
mentation cavity. All the cells of the blastosphere are crowded with
yolk spherules, which are, however, very much smaller in the upper
cells, where active division is going on, than in the more inert lower
cells. The latter may be conveniently termed the yolk cells. The
segmentation cavity is considerably larger than that of the frog’s
ovum ata similar period. The next stage in the development of the
ovum is accompanied by the thinning out of the upper layer of cells,
until the roof of the segmentation cavity finally consists of a single
layer of cells. On this point my observations confirm those of Calberla,
and are opposed to those of Max Schultze, who found a many-layered
roof covering the segmentation cavity just before invagination. The
layer is composed of epiblastic cells, and in this respect resembles the
many-layered roof of the segmentation cavity in the frog’s ovum of
the samestage. The lower cells of the many-layered roof seem to pass
round to the sides and floor of the segmentation cavity, so that about
the fiftieth hour after fertilisation the upper half of the egg consists
of a hemispherical segmentation cavity, roofed in by a single layer of
cells, the lower half being solid and composed of yolk cells. Viewed
as an opaque object, the upper half is of a whiter colour than the
lower.

The invagination to form the mesenteron takes place in the region
where the single layer of epiblast cells passes into the yolk cells. In my
egos the first trace of this invagination appeared about 130 hours after
artificial fertilisation. The mouth of the invagination or blastopore
is at first a wide arched slit, which subsequently narrows to a round
hole. From the first sign of invagination, a eavity, the mesenteron, is
present; in this the Lamprey resembles Amphioxus, but differs from
the Frog, where the mesenteron is formed as a slit some time after the
invagination has begun. It differs from Amphioxus, however, in the
fact that the invagination is not symmetrical, being like the segmen-
tation cavity, pushed dorsally by the accumulation of yolk cells at the
lower pole. The upper layer of invaginated cells retain the character
of the epiblast cells, the lower are larger, and have the characters of
the yolk cells. The former lie close against the inner surface of the
epiblast cells in the dorsal median line, here again differing trom the
Frog, where a mass of cells, which.subsequently form mesoderm, lies
dorsally to the invaginated cells and between them and epidermis.
There is thus no mesoblast present at the dorsal rim of the blasto-
pore, such as is found in frog’s egg. During these processes the
epiblastic cells have gradually enclosed the yolk cells; this appears to
take place by the conversion of the outer yolk cells into epiblast
cells, and takes place latest in the region of the blastopore. The
mesenteron continues to deepen, and as it increases in size the seg-
mentation cavity diminishes, and is finally obliterated. The roof and

246 Mr. A. E. Shipley. On the Mesoblast [ Nov. 26,

sides of the mesenteron consist of columnar cells, in appearance very
hike the epiblast, against the inner surface of which it is closely
pressed. The floor is composed of cells, which retain their yolk-like
characteristics for a considerable time. The mesoblast now begins to —
appear by the differentiation of two bands of those yolk cells which
he in the angles formed by the invaginated mesenteron and the
epiblast. The differentiation appears to take place from before back-
wards. The two bands of mesoblast are separated. from one another
in the dorsal median line by the juxtaposition of the invaginated hypo-
blast and the epiblast. They are separated ventrally by the hypo-
blastic yolk cells which are in contact with the epiblast over the
lower two-thirds of the egg. Subsequently, but at a very much
later stage, the mesoblast is completed ventrally by the downgrowth
on each side of the mesoblastic plates. ‘These proliferate cells at their
edge, which grow down between the hypoblastic yolk cells, and so
complete the mesoblast ventrally. The first formation of the longi-
tudinal band appears to take place by a differentiation of hypoblastic
cells in situ, and not by an invagination of cells..

This account of the origin of the mesoblast differs materially from
that given by Scott. According to: his: observations, the mesoblast is
derived from two sources: (1!) cells which are invaginated with the
mesenteron, these form the longitudinal bands; (2) the outer layer
of hypoblastic yolk cells, which split off the: remainder, and form the
ventral sheet which completes the mesoblast on that side of the body.
Since by this time the head: of the embryo has raised itself above the
yolk, there are no hypoblastic yolk cells in it,, and consequently its
mesoderm is entirely derived from the first source, whereas in the
trunk the dorsal mesoderm is derived from the-first source, the ventral
from the second.

By the time that the mesoblastic plates become separated from the
yolk cells, the neural plate becomes evident in the exterior. This
extends from the blastopore as a low ridge,. over two-thirds of the
circumference of the egg. Its appearance: is soon followed by the
separation of the anterior end from the: rest of the yolk.

The invaginated endoderm has extended round for more than half
the circumference of the egg, and its most anterior portion is included
in the head, which is by this time distinct: from the rest of the
embryo.

All this time the blastopore has been visible at the posterior end of
the neural plate. It has been figured in this: position by Schultze,
who gives a very complete set of figures of the embryo viewed as a
whole. The elongation of the embryo now proceeds so rapidly that
the anterior end curves round over the blastopore; the posterior end
is much the largest, containing all the food yolk.

_ Schultze, from observations upon the whole embryo, came to the

1885. ] and Blastopore of the Lamprey. 247

conclusion that blastopore persisted as the anus, and this view was
supported by Calberla. On the other hand the later observers, who
have studied the development by means of sections, have maintained
Benecke’s view that the blastopore closes. Scott describes the neural
canal as enclosing the blastopore, and by its closure forming a
neurenteric canal, which he figures. He states that the anus is sub-
sequently formed by a protrusion of the alimentary canal against the
skin, which becomes open about the twentieth day. Balfour states
that the blastopore closes, and does not form the permanent
anus.

My observations on the embryo: as ani opaque object led me to the
belief that the blastopore remained open, and in this I have been
confirmed by a number of series of sections taken from embryos of all
stages, from the commencement of the invagination until the time
when the cloaca is definitely established. At its first appearance the
blastopore is situated. at the posterior dorsal surface of the embryo,
but by the elongation of the:embryo.and the formation of the tail the
blastopore comes to occupy a position on the ventral surface.

Scott was of opinion that the lumen of the invaginated mesenteron
persisted only in the fore-gut. This part of the alimentary canal
shortly after the invagination is: completed is raised with the head
from the rest of the embryo.. This part is therefore free from the
large yolk cells, and the cells lining the mesenteron soon assume a
definite columnar character, although they continue to contain yolk
granules for aconsiderable time. According to Scott and Calberla the
lumen of the mesenteron in the trunk entirely disappears, and only
appears again at a muchi later stage. My sections, however, show
that the lumen never really disappears. At its anterior end, as is just
mentioned, its lining: cells soon become: columnar; and these extend,
from its blind anterior-end to the posterior part of what will subse-
quently form the gill region. A similar change takes place at
the posterior end. The cells surrounding the blastopore, and extend-.
ing for some distance into the alimentary canal, very early assume a
columnar character, and are in: fact indistinguishable from the epider-
mal cells. The cells lming the-mid-gut do not assume this epithelial-like
character till a much later stage. The dorsal row are, however, more
columnar than those on the ventral side; these latter have just the
same characters as the other yolk cells.

At its posterior end the neural tube becomes solid, and this solid
rod soon fuses with the posterior end of the notochord, and with a
solid rod of cells which pass backwards from the hind-gut, and pro-
bably represent the post-anal gut. <A little further back the meso-
blastic plates join this mass of indifferent tissue ; so that we have behind
the anus, in a position corresponding to the front lip of the blastopore,
when it occupied its primitive position on the posterior dorsal surface,

U

248 Dr. C. A. MacMunn. Researches on [Nov. 26,

a mass of indifferent tissue, into which pass representatives of all
three germinal layers. This must represent the primitive streak.

The persistence of the blastopore to form the anus has been demon-
strated in the Amphibia, by Miss Johnson in the Newt, by Gasser in
Alytes, and by Spencer in the Frog. The fact that it persists in the
Cyclostomata appears to point to the fact that this is a primitive
feature retained in those eggs which have not become much modified
by the presence of a large mass of yolk. This view would be greatly
confirmed if renewed observation on the development of Amphioxus
should demonstrate the same fact.

III. “ Researches on Myohamatin and the Histohematins.’ By
C. A. MacMunn, M.A., M.D. Communicated by Professor
M. Fostsr, Sec. R.S. Received October 19, 1S.

(Abstract. )

This paper contains an aecount of observations made on the spectra
of the organs and tissues of invertebrates and vertebrates, which
have brought to light the presence of a series of animal colouring
matters which had not previously been discovered.

The name histohzmatins is proposed for all these colouring matters,
and that of myohzmatin for the intrinsic pigment occurring in
striped muscle, which belongs to the same series.

These pigments are not identical with any known decomposition
product of hemoglobin, and they are found in animals in whose
bodies no hemoglobin can be found.

The method of examination is as follows :—The tissue or part of
organ to be examined is put into acompressorium, by means of which
any required thickness can be obtained, it is illuminated by means of
a large sub-stage condenser, and examined with a Sorby’s microspec-
troscope fitted to a binocular microscope, the binocular form being
preferred, as one tube is free for the observation of the specimen.
The source of illumination was generally an argand gas burner, some-
times direct sunlight, sometimes a Swan lamp. The objectives of the
microscope up to the one-eighth were so adapted as to enable both
fields of the microscope to be fully illuminated, which is a matter of
importance in dealing with small quantities of material, or in differ-
entiating those portions of an object which give different spectra.

The Histohematins —Examined in this way the organs and tissues
of invertebrates and vertebrates present a series of spectra, which are
all evidently connected with each. other. From Echinoderms to man
the same appearances have been found; thus there is a most striking

1885.] Myohematin and the Histchematins. 249

likeness between the spectra of such organs as the ovaries of a star-
fish and the pancreas, stomach-wall, kidney, and other organs of a
cat, and between these and that of striped muscle throughout the
whole animal kingdom.

To give an idea of the character of these spectra and their distri-
bution is not easy in an abstract, but in general they may be said to
consist of at least three bands—one before D, one or two between D
and H, and sometimes one or two others nearer violet. When one
band occurs between D and H it replaces the two found in other cases,
which are of great narrowness compared with other physiological
spectra. The band before D is always the same both in the histo-
heematins, and in myohematin with few exceptions. Sometimes this
kind of spectrum is replaced by another in which two narrow bands
like those of reduced hematin occur nearer the violet than the bands
of the latter. It was proved repeatedly that the banded spectrum
belongs to the deoxidised condition, and the bandless to the fully
oxidised ; accordingly these pigments are respiratory.

Among animals in which I have found these spectra a few may be
enumerated with the organs in which they occur. Thus in Hchino-
derms the ovaries, stomach-wall, and other parts of Uraster rubens show
them well marked.

In molluses, Limax flavus, L. variegatus, Arion ater, Helix aspersa,
H. pomatia, and other slugs and snails contain them in such parts
as the nephridiwm, albumen gland, ovo-testis, receptaculum semints, foot,
wall of crop, oviduct, penis and elsewhere, and all contain myohematin
in the muscle of the heart in both auricle and ventricle, also in the
pharyngeal muscle. In these species, as Dr. Sorby first showed, the
bile contains a kind of hematin, which is evidently connected with
the histohematins for reasons given in the complete paper. In
other molluscs such as Inttorina littorea, Purpura lapillus, Trochus
cinerarius and ziziphinus, Patella vulguta, Limnceus stagnalis, Mytilus
edulis, Ostraea edulis, Anodonta cygnea, and others, they have been
observed by the above method of examination.

In Arthropods, such as Homarus vulgaris, Astacus fluviatilis, Cancer
pagurus, Carcinus moenas, and Pagurus Bernhardus, they have also
been found, in such situations as the green glands (of the two first), the
stomach-wall, lwer, exceptionally in the branchie, and elsewhere.
They are also present in insects and in spiders.

_In all these invertebrates (and others) they can be studied unin-
fluenced by the presence of hemoglobin. Wherever they are seen the
corresponding tissue or organ is more or less yellow or reddish-yellow,
but sometimes almost colourless.

On examining vertebrates I was surprised to find the same spectra
in such situations as the liver, spleen, kidney, stomach-wall, pancreas,
wall of intestine, and sometimes in the ovary. And by washing out

250 Dr. C. A. MacMunn. Researches on [Nov. 26,

the blood-vessels with salt solution, I found the bands became much
better marked.

Thus :—In fishes they have been observed in the tench, herring,
roach, eel, and others.

In reptiles, in Tropidonotus natriz, Bascaniwm constrictor, Scincus
officinalis, Trionyx, HEmys Huropea, Lacerta viridis, and Lacerta agilis.

In Amphibians, in Rana temporaria, Hyla arborea, Bufo vulgaris,
Salamandra maculosa, Siredon pisciformis, and others.

In lirds, e.g., pigeon, owl, turkey, goose, duck, swift, &ec. The gizzard
of birds is, however, mainly coloured by oxyhemoglobin.

In Mammals, e.g., dog, cat, rat, rabbit, guinea-pig, hedgehog, sheep, ow,
pig, mouse, and man, as well as in others.

In all cases oxidation and reduction could be brought about. When
the bands are invisible they can be brought into view by dipping the
portion of organ or tissue into Stokes’s fluid, or into a weak solution
of ammonium sulphide in water; on exposure to the air they become
faint. .

Myohematin.— All the species enumerated and others have been
examined for myohematin, and in all those which possess striped
muscle it has been found.

Thus in molluscs, itis found in the heart and pharyngeal muscle of
Inimaz, Arion, Helix, and other pulmonates.

In Arthropods, in the cardiac muscle of Homarus, Astacus, Cancer,
Carcinus, and Pagurus, and not in their voluntary muscles (so far) ;
also in the muscle of the cephalo-thorax of such spiders as Hpeira
diadema, Tegenaria civilis (and others).

In insects it is abundantly present, especially in the muscles from the
thorax. It is best marked in those which move the wings actively,
such as diurnal and nocturnal lepidopters. So far it has been found
in the following insects:—Musca vomitoria, domestica, and chlora,
Apis meilifica, Bombus terrestris, Vespa vulgaris, Hydrophilus, Dyticus
marginalis, Geotrupes stercorarius, Lucanus cervus, Coccinella, Staphy-
linus olens, Cerambyz moschatus, Creophilus maxilosus, Carabus violaceus,
Peripluneta orientalis, Gryllus domesticus, Acrida viridissima, Tipula
oleracea, Pieris rayae, and various other lepidopters and dipters. It
has also been found in the mouth parts of larve.

Among vertebrates it has been found in the heart and voluntary
muscle of all the fishes, reptiles, amphibians, birds, and mammals
enumerated above. It is frequently accompanied by hemoglobin ,in
these classes, and sometimes replaced by it. It may be apparently
absent, but its bands may be brought into view by the use of reducing
agents.

The spectrum of myohematin i is remarkable for the sharpness ind
narrowness of its bands, in which point it and the other histohematins
differ from any other known animal pigment. Three bands are

1885. ] Myohematin and the Histohematins. 251

always present, one between C and D, close to D, which corresponds
to the first band of the histohzematin spectrum, two very narrow and
sharp, of which the second is darker than the first between D and
E;. besides these there are one or two nearer violet, one covering
E and J, the other before F, which are not always present. The 2nd
and 3rd bands correspond closely to similar bands in the histo-
hematin spectrum, in which they may appear joined to form one
broad band.

The colour of the pigment giving this spectrum is yellow or
reddish-yellow, but even in very pale muscles the bands can some-
times be seen, especially after the use of a reducing agent.

Various attempts have been made to isolate myohematin, but
owing to the coloured constituent being joined to a proteid, it will
not go into any of the usual solvents. It has been proved by pressing
out the plasma from frozen muscle that some of the myohzmatin
belongs to the plasma, but even after this treatment, its bands are
seen better marked in the muscle than before. It has also been got

from blood-free muscle by digesting in pepsin solution, which, how-
ever, alters the pigment, as it no longer gives the original spectrum,
but another which is remarkable, as it is imitated closely by a spec-
trum sometimes seen in insect muscle without any treatment.
Obtained by this method, the pigment is of a yellow colour, and is
only soluble in water.

From the changes which the histohwmatins aud myohematin
undergo with oxidising and reducing agents, and for reasons given in
detail in the paper, I have come to the conclusion that these pigments
are concerned in the internal respiration of the tissues and organs in
which they are found.

Spectrum of the Adrenals.—Another point of interest brought to
light by these observations is the occurrence of hemochromogen in
the medulla of the supra-renal glands of mammals; thus in tlis
situation in man, dog, cat, ox, sheep, pig, guinea-pig, rabbit, and rat,
I have found hemochromogen, the bands of which are very dark;
and it would appear that this hemochromogen is partially removed
by washing out the blood-vessels with salt solution. Hence, and
owing to the fact that elsewhere it is excretory, as in the bile, the
hemochromogen of the adrenals appears to be excretory; if so a
downward metamorphosis of hemoglobin, and probably (for reasons
given in the paper) of the histohzmatins, is one of their functions.
Hence if by disease, or by artificial removal, this metabolism is
prevented, the incompletely metabolised pigments circulate in the
blood, and staining of skin and mucous membrane, as in Addison’s
disease, may take place. In the urine of Addison’s disease such an
imperfect metabolite occurs as I have already shown.*

* “ Journal of Physiology,”’ vol. vi, p. 37.

Doe On Myohematin and the Histohematins. [Nov. 26,

To give an idea of the connexion which exists between the histo-
hematins and myohematin, I have here added a few wave-length
measurements. These are given in greater detail in the complete
paper, and the spectra have been mapped to the number of 70 in the
accompanying charts. .

No. 1. A histohematin spectrum from the ovaries of a star-fish
- (Uraster rubens) :—

‘ist Band, ss sec ~ 613—593
PALI es eigen oak tenes 069—560
ECs pcre emulate N956—548 5

No. 2. A histohematin spectrum from the stomach-wall of a
cat :—

Ist Bands, 3..)./0. X6138—593
Bind re perk ete tear 1569—563
Sg Rane iges ng ae eee A506—5o51

No. 3. A similar spectrum from the pancreas of a cat :—

Istubands, sees. x6138—596 °5
ZING eee eS .2. AV6I—563
S120 Mamas ae cea ae AD56—548 *5.

No. 4. A myohzematin spectrum from Hydrophilus :—

istepand see se - AGI8—593
Da sg Pee ae 3 NDOD——50a
23) G0 a beech le Aine cto ADD /—048—5

No. 5. A myohzmatin spectrum from the heart of the lobster
(Homarus vulgaris) :—

iso Bande ee. see. X613—593
PING Mops thi ois ropereet ae 15 69—563
DOUG: lay cece Matias X556—550
No. 6. A myohematin spectrum from the heart of a cat :—
Vsti Bam... 2 ste. ays X613—596°5
ZI ak Se oe ee 1969—563
OEC Goa se spt 1956-—550

It may be added that it is very difficult to measure these bands,
and allowing for this fact the agreement is very close, especially
as all the measurements were made independently of each other. It
is also necessary to add that the above are what may be called typical
histohematin spectra, as in some cases Bands 2 and 3 are joined to
each other to form one band.

1885.] Geometrical Construction of the Bee's Cell. 253

IV. “On the Geometrical Construction of the Cell of the
Honey Bee.” By Henry HEnNEssy, F.R.S., Professor of

Applied Mathematics in the Royal College of Science,
Dublin. Received October 20, 1885.

The well-known problem of the bee’s cell occupied the attention of
eminent mathematicians early in the last century, and it is still pre-
sented as an interesting example of geometrical maxima and minima.
In 1743 Maclaurin communicated to the Royal Society a solution of
the question, which appears in the ‘‘ Philosophical Transactions,”’* and
it seems that the comparison between the mathematical results and
the actual cells was effected by angular measurements. Long since
a simple method occurred to me for the construction of the figure
without employing angles, and as I have not been able to find it in
any publication, I venture to submit it in this short paper. |

A structure has a regular hexagon for its orthogonal cross section, ©
and is terminated by three lozenges which meet in a trihedral angle;
required the relation between the side of one of these lozenges and the
side of the regular hexagon forming the cross section of the prism so
as to give the smallest surface to the structure. The long diagonal
of one of these lozenges is equal to the side of the equilateral triangle
inscribed in the hexagon; if we call this H and the short diagonal e,
then—

B= V 3h and e= V h? +422,
where h is the side of the hexagon, and z the difference between the
parallel sides of one of the six faces of the prism. The area of a
J Bh h? + 4a?
2

lozenge is therefore

h(2l—a)
ee

, and that of the face of prism

For wu, the total surface of the structure, we have

3h ao
wa V3(h? + 4a) +2(21—2)],

and hence = 8h | =a
Vv h? + 4x2
Thi , ted t li
es %=——=: .
is, equated to zero, giv aye)
A side, s, of the lozenge is manifestly V/724 ,2, hence
Sao,

* Vol, 42,

254 Geometrical Construction of the Bee's Cell. [Nov. 26,

A side of the lozenge is thus equal to three times the difference
between the two parallel edges of the trapezium. If a line equal to
the side of the hexagon be bisected by an equal line at right angles,
and the extremities of both joined, half the resulting line will be
equal to x, so that the side of one of the lozenges 1s three tumes the half
side of a square whose diagonal equals the side of the hexagon. It is
moreover manifest that

Pu 6/3: of | hv ee
dx® (h?+4a?)s = h? + 4a2/ ;

h
which is positive for iT5Ue and therefore the surface wu is the least
possible. As the angle at top of the trapezium has for its tangent
; % |
-=2 V2,:this angle is 70° 31’ 44”, the supplement of 109° 28’ 16” for

the obtuse angle of the lozenge, found by Maclaurin.

It is manifest that H=hv3 and e= V 2K, or the longer diagonal, is
equal to the diagonal of a square whose side is the shorter diagonal
of the lozenge. Also the acute angle of the lozenge is equal to the
acute angle of the trapezium, for the tangent of half the former

lee |

v2
From these results a model of the bee’s cell can be easily con-
structed, with the aid of a pair of compasses, as follows :—

1. Inseribe an equilateral triangle in a hexagon; a side of this
triangle is the long diagonal of the lozenge; bisect this, and the
diagonal of a square erected on the half is the shorter diagonal of the

is

lozenge.

2. Draw six parallel lines at distances equal to the side of the
hexagon, and a straight line perpendicular to them from the second
of the parallel lines; inflect a straight line equal to a side of the
lozenge above constructed, and repeat this process until six tra-
peziums are finished.

3. On folding these trapeziums a hexagonal prism is formed into
which three lozenges equal to that constructed will accurately fit, and
the entire structure will be completed. Models in cardboard have
been easily made in this way, and I had one afterwards made in
glass.

2 tan 36

iL
ie. UP ata +0 =, tan) — 2a.
1—tan?36 Ve,

* As tan @=

1885.] Terrestrial Magnetism in the Horizontal Plane. 255

V. “Results deduced from the Measures of Terrestrial Mag-
netic Force in the Horizontal Plane, at the Royal
Observatory, Greenwich, from 1841 to 1876.” By Sir G. B.
Arry, K.C.B., F.R.S., late Astronomer Royal. Received
June 24, 1885.

(Abstract.)

in offering to the Royal Society some results deduced from the
systems of magnetic observation and magnetic self-registration
established several years since at the Royal Observatory, Greenwich,
during a portion of the time in which I presided over that institution,
I think it desirable to premise a short statement on the origin of the
Magnetic Department of the Royal Observatory, and on the successive
steps in its constitution.

It appears to have been recognised many years ago, that magnetic
determinations would form a proper part of the business of the Royal
Observatory. When I commenced residence at the Royal Observatory,
at the end of 1835, I found in the garden a small wooden building,
evidently intended for the examination of compasses, perhaps of the
size of those used in the Royal Navy. But the locality was incon- |
venient, and the structure was totally unfit for any delicate magnetic
purpose; for instance, the balance-weights of the sliding windows
were of iron. For some preliminary experiments a small observatory
was borrowed from Captain Fitzroy, but no real progress was made
in magnetism.

In the beginning of 1836, a scheme for the erection of a Magnetical
Observatory was brought before the Board of Visitors. The Board
approved the plan, and recommended it favourably to the Admiralty.
The Government Department superintending the Park gave their
consent to an extension of the grounds of the Observatory, and the
ground was inclosed in 1837. 'The Magnetic Observatory was built,
from my plans, in the spring of 1838. Since that time, no alteration
has been made in the building, except in 1864, when the ground
below the east, west, and south arms, was excavated, in order to
obtain positions for the three fundamental instruments in which the
severity of the temperature-changes would be much diminished.
Small accidental interruptions of observations occurred in 1847,
January, and 1861, July.

The interest taken in the subject of terrestrial magnetism in the
first half of this century was occasioned principally by the enterprise
of Gauss and other German philosophers. Magnets were, therefore,
established at the Royal Observatory, furnished with apparatus adapted
to eye observations corresponding to those of Gauss, and some

VOL. XXXIX. Si

256 Sir G. B. Airy. Results from Measures of [Novy. 26,

observations were made in concert with the Germans. The observa-
_ tions to the end of 1847 with these instruments were made entirely
by eye; the instruments (magnets 2 feet in length) being furnished
with small plane reflectors, to which telescopes were directed,
and by which fixed marks were observed. The observations
were made at every two hours, day and night; proper precautions
were taken for assurance of the general accuracy of the times of
observation; and I do not doubt that the results interpreted from
these observations are each as good as those derived from the
succeeding system; though the intervals of two hours were longer
than I could wish. But the labour was great, and (as measured by
the interruption of assistants’ work) was expensive.

The idea of self-registration by photography of the movements of
the intruments (an idea little entertained before that time) then
suggested itself; and, at the Cambridge Meeting of the British
Association in 1845, it was proposed for consideration of the
Council of that body, that the Government should be requested to
promote, by offer of a pecuniary reward, the construction of a
photographic self-registering instrument. This proposal was adopted
by the Council; letters were addressed by Sir John Herschel, Pre-
sident of the Association, to Her Majesty’s Treasury, and by myself
to the Admiralty; and, finally, the assistance of Dr. Charles Brooke
was secured, for forming an eflicient apparatus, and making the
necessary chemical arrangements adapted to our wants.

I do not propose here to describe the photographic recording
apparatus. Allusions to the construction will be found in the
Introductions to the Greenwich Observations for successive years, and
especially, and in great detail, in the introduction to the volume for
1847. The only alteration that was made in it for several years is the
following. Mr. Brooke had conceived that advantage would be
gained by making the recording barrel to revolve in twelve hours.
But this caused a doubling of the curves traced on the photographic
paper which is wrapped upon the barrel; and the inconvenience
produced by this doubling was soon found to be so great that I
thought it necessary to alter the clock-work so as to produce a
revolution of the barrel in twenty-four hours. The records of the
change of western declination from the north, and of the change of
horizontal force, are made on the same barrel; and by alterations,
first suggested by myself about 1881, and carried out by the
present Astronomer Royal (then Chief Assistant), the two curves are
now so traced that the simultaneous records of the two instruments at
all times are-in close juxtaposition.

While the observations were made by eye, at every two hours, the
means of the two-hourly readings were adopted as base for the day,
and the excess of each two-hourly reading above the mean was adopted

‘ ‘

1885.] Terrestrial Magnetic Force in the Horizontal Plane. 257

as ‘‘maenetic inequality ” of that ordinate for that hour ; producing
twelve measures of “inequality” for each day. When the photo-
graphic system was introduced, the elevation of a pencil curve drawn
by eye so as to smooth down the irregularities of the photographic
trace above a photographic base was measured for every hour,
producing twenty-four measures of “inequality.”

In the instances of excessive and rapid disturbances of the magnets
during magnetic storms, no measures of ordinates were taken for the
present purposes.

Thus the daily measures at each hour or two hours were obtained.

The next step was to collect for each month all the daily measures
on corresponding hours through each month, and to take their mean.
These are the measures for the hours which are actually treated in the
present memoir. By combining (for each month) the inequality of
magnetic horizontal force at every two hours or each hour, as
abscissa, with the inequality of magnetic declination (on the same
scale of measure) at the same two hours or hour, as ordinate, points
were defined in every monthly curve representing completely the
mean diurnal changes of magnetism for each month. On the recom-
mendation of the Board of Visitors of the Royal Observatory, reduced
photographic copies of these curves were prepared by the Astronomer
Royal for publication with the volume of Greenwich Observations for
1884.

The number, and the character, of the curves produced uninter-
ruptedly on this plan, and the circumstance that they are intended
for publication in the Greenwich Observations, appear to render
them unfit for dissemination in the Royal Society’s Transactions. I
have, therefore, decided on the following course. With the permis-
sion of the Astronomer Royal, I have adopted the three years 1863,
1864, 1865, for partial exhibition of results. (Any other years would
have answered equally well, for general exhibition.) For each of
these years I have attached to this paper the curves for the months
January, April, July, October, which suffice for showing generally the
characteristic changes of magnetism for the several months. But
some general account may be given, for which this is perhaps a
_ suitable place. ;

The form of the curves, and the position of the points on them
corresponding to hours of solar time, leave no doubt that the diurnal
inequality is due mainly—and, as far as I can judge, entirely—to the
radiant heat of the sun; and, it would seem, not to the sun’s heat on
the earth generally, but to its heat on parts of the earth not very
distant from the magnets. In the hot months of the year, the curve,
though far from circular, surrounds the central point in a form which,
as viewed from that central point, never crosses itself; and is,
roughly speaking, usually symmetrical with regard to H. and W.

| 8 2

258 Terrestrial Magnetism in the Horizontal Plane. [Nov. 26,

- But in the cold months, the space included in the curve is much
smaller in many cases, probably not more than one-sixth of what it
is in the summer months; and the curve often crosses itself in the
most bizarre fashion with irregular loops stretching out, three
crossings in one curve occurring very frequently. In the summer
months there is a certain degree of symmetry ; but here is, constantly,
a preponderance on the west side, which leads me to imagine that the
magnetic effect of the radiant heat upon the sea is considerably
greater than the effect on the land.

To obtain some numerical basis for a report, which though
exceedingly imperfect may convey some ideas on this wonderful
subject, I have adopted the following course. I have confined myself
to the months of June and July as probably the two hottest, and the
months of December and January as probably the two coldest. For
each of the curves applying to these months, I have laid down a
system of rectangular co-ordinates, corresponding to the Greenwich
meridian and to the line at right angles to the meridian (or the
geographical H. and W.). The extreme north ordinate and the
extreme south ordinate are measured, and their sum is taken, and
interpreted by a scale of measure formed in accordance with the
theory of the intruments; and this interpreted sum forms the “ Range
of Meridian Force’”’ in terms of the whole Meridian Force. In the
same manner, the “‘ Range of Transversal Force’”’is measured. As the
time of each of the two-hourly or hourly records is marked on the
curve, there is no difficulty in fixing approximately on the solar
times corresponding to the extreme N. and S. values, and the
extreme HE. and W. values, mentioned above. These are all the
elements of the magnetic record which are described in the subjoined
table.

The changes in the monthly records are very remarkable. They
leave no doubt in my mind that the diurnal magnetic changes are
produced by the sun. But I cannot account for every change that
takes place in the course of a day; nor can I undertake to say
whether we can found, on these, the theory that general terrestrial
magnetism is a part of solar radiation, perhaps sometimes acting
through or sometimes impeded by the masses of Jand and sea on
which that radiation acts.

Still I think that a considerable step is made by the establishment
of a connexion between terrestrial magnetism (on one hand), and the
radiation, or, at least, the visibility of the sun (on the other hand).

1885. | Studies of Disinfectants by New Methods. 259

VI. “Studies of Disinfectants by New Methods.” By
A. WyNTER BuyTH, Medical Officer of Health. Commu-
nicated by Dr. B. W. RicHaRDSON, F.R.S. Received
October 8, 1885.

The object of this paper is to communicate the results of a study
of the action of disinfectant substances which has occupied the leisure
of the author for the past eighteen months. Three series of experi-
ments have been made, viz. :—

1. On the Bacterium termo.

2. On the various micro-organisms in sewage.

3. On the disinfection of typhoid excreta.

The term disinfectant as used throughout this paper must be con-
sidered as synonymous with “germicide”’; to disinfect a thread or a
drop of liquid contaminated by bacteria is, according to my view, to
kill, and to kill not by a destructive or corrosive, but by a true
poisonous action, all the micro-organisms, so that the ‘‘ disinfected ”’
micro-organisms placed under the most favourable conditions for
growth are incapable of any further development.

1. The Disinfection of the Bacterium termo.

A pure cultivation of the Bactertwm termo was made in ordinary
sterile, solid, nutrient gelatin; the somewhat fluorescent greenish
liquid to which the upper layers of the gelatin were reduced, by the
growth and multiplication of the bacterium, was submitted to the
various disinfectants in the manner to be described, and then the
bacterium was withdrawn as far as possible from the influence of the
disinfectant and planted, as it were, in fresh nutrient gelatin. The
methods used in the sterilisation of beakers, test-tubes, &c., as well as
the preparation of nutrient gelatin, differed in no essential respect
from the same methods in general use in biological laboratories, and
therefore need not be described.

The B. termo was submitted to the action of the disinfectants by
two methods, which may be called the “ drop” and “ thread ’’ method
respectively.

The Drop Method.—Sterilised pure water was infected with a few
e.c. of gelatin liquefied by the bacterium ; measured volumes of this
infected water were added to measured volumes of the disinfectant,
and the whole allowed to act for twenty-four hours. A drop of this
liquid was then added to from 10—20 grams of the nutrient gelatin,
first liquefying it at a very gentle heat. As the proportion of the
weight of the drop to the weight of the nutrient gelatin varied from
about 1: 500 to 1:1000, the dilution was in most cases sufficient to

260 / Mr. A. W. Blyth. [Nov. 26,

reduce any antiseptic or inhibitory action of the minute quantity of
the chemical agent in the drop itself to a minimum, so as to exercise
no appreciable effect.

The Thread Method.—In the thread method capillary glass rods

were made by drawing out ordinary glass tubing in the hlow-pipe
flame, these were tipped with sealing-wax, and to the wax a little bit
of sterilised cotton wool was made to adhere.
- The end of the rod thus prepared was infected with the bacterium
by a short immersion in a pure cultivation and was then placed in the
disinfectant for twenty-four hours. The rod on removal was soaked
for a little time in sterilised water until all trace of the disinfectant
had been removed.

The rod thus charged and purified was next inserted into a mass of
solid nutrient gelatin in a test-tube, and put on one side at the ordi-
nary temperature of the atmosphere, protected of course from external »
contamination by a suitable plug of sterilised wool. Whether the
process used was that which I have called the “drop” or the
‘“‘ thread,” in each case ‘‘ control” experiments were made with threads
infected with the bacterium, but which had not been submitted to
disinfection.

Alcohol, Hther, §c.—As it was necessary to dissolve many of the
substances experimented upon in weak alcohol, a series of experiments
were made to ascertain the influence of alcoholic and other solvents
on the life of the bacterium, and the following table gives the result.
Alcohol of 60 per cent. disinfected, but absolute amyl alcohol, pure
ether, chloroform, and carbon disulphide merely delayed the growth.

Alcohol, Chloroform, Ether, and Carbon Disulphide—(Thread
Method).

Dayseccs cess | Zool 8B.) 41° 6. 156.17. 4 BL) 20 aes eal eet

At 15°5°—
Alcohol 5 per cent. ..

Teele

Carbon disulphide ..

s water

5: 5. |

Carbon disulphide water

a
Ether .
Chloroform . so 85
Control . + |

(St)
(en)
ee ee es ee ee ee fe

see a | mel el ree Poe

|
|
|
+

|
|
|
|
+

1885. ] Studies of Disinfectants by New Methods. 261

The — sign in the table denotes “no growth,” the + sign means
that on the day denoted in the upper column the gelatin began to
liquefy, and growth to appear.

Phenol and Oresol.—These experiments were made by the “ drop”
method.

Weighed quantities of pure crystalline phenol and of pure liquid
cresol* were dissolved in 20 per cent. alcohol in such proportion that
the strength was exactly 1 per cent. Water which had been infected
with the bacterium was measured from a burette into test-tubes, and
definite quantities of the phenol or cresol solutions added; the volume
of the whole being kept at 10 c.c., e.g., 3 c.c. of phenol solution, and
7 c.c. of the infected water would equal 0°3 per cent., 1 c.c. of phenol
solution and 9 of the infected water would equal 0-1 per cent., and so
on. Atthe end of twenty-four hours nutrient gelatin was infected
by means of dipping a clean recently ignited platinum wire in the
liquid, and then inserting the wire for a second or two in the gelatin,
which had been previously liquefied. ‘The following short table sum-
marises these experiments; as before, the — sign denotes no growth,
the + sign denotes the first appearance of evident: growth and lique-
faction.

Phenol and Cresol..

Day Seavert 2a ron e4e \ De lO de | Sil 9: |-10;

OO ey nee

At 15°5° C.—

Phenol 0:01 per cent. .. 2.2...
0:05 as whe eshte

me LO ry

9) 0°25 3”)

9 0°50 bb]
Cresol 0°01 au

bb) 0°05 bb)

AO LO 33

bb) 0°25 ”

OBL ;
Controle irs ovale aero als

fel ele algelele tale
levelieaheast= lie = [Ate lal
[2a ale oleae = ee ea
}ltt+t+}4¢4+4+4

@eeeeve sve oe

fpalel ciel et ie eee

At 35°5° C.—

iEhenol'O;01 per cent... 2s. -/.
99 0°05 99 e@e@eece
a9 0°10 ”?
39 0°25 a)

Cresol 0°01 ha
O00 : HO 66 OGL we
> 0°10 9 @eeceeeve ve
a) 0°25 99) Fee Ones'ep'e.\ 0. 8:'e —-) _— — — —

TS Fre sa Rt ee fae
We lizsle clea leslie
i es ro Pee ae ee

* The cresol used was the purest commercial sample, and was obtained from
Messrs. Calvert.

262 Mr. A. W. Blyth. [Nov. 26,

The table gives the results obtained at the ordinary temperature,
and also at the temperature of 35°5°.

The effect of a temperature of 35°5° is remarkable, and goes far to
explain the happy effects of the so-called antiseptic or Listerian
method of surgery. The effect of the higher temperature is seen
mainly in the longer period of time between the infection and the
subsequent growth, e.g., when the phenol was present in the propor-
tion of 0-1 per cent., under these conditions the growth was retarded to
the seventh and eighth day, and 0°25 of phenol which did not disinfect
with certainty at from 15—16° did so at 30°0°.

Pyridine Series—Pure samples of pyridine (C;H;N), picoline
(C,H,N), lutidine (C;H,N), collidine (C,H,,N), parvoline (C,H,,N),
and also acridine (C;,;H,N), and acridine hydrochlorate were placed
at my disposal by Mr. Benjamin Nickels.

Solutions of the bases were made in 20 per cent. alcohol, and the
bacterium was experimented upon on the same lines as in the pre-
series of experiments.

The table gives the general results obtained, and establishes well

The Pyridine Bases.

DAVE mines 2.) 3. | 4 | Sa, 6. |. 7.) So oe eee
At 15°52—
Pyridine 0-9 per cent. ....} — | +
” 16 ” as ai as aa T, =. a = = =
” 2°0 ” = <r = yr ail = = =a = =
Parvoline 0°45 __,, mie Pape |e | a) Sea
” 0°83 ” = hk. <— oF = : Se = = =
z= Ei ee ee en ee ee ee
5 O:2a2 —., ee geal <=
Picoline 09 - — | +
” 16 ” = ote
” 2°3 9 =: ar ats
4 30 = |e a Jeeta oo) er
Lutidine 0°45 __s,, —|—]+
”) 0°83 ” nat oar =e aa a5
x9 1:15 ” e ye rag, = ca +
At 35°5°—
Lutidine 0°5 Ms Re ea ea ie a eee fe
Atel a= :
Collidine 0°45 __,, See ale ea Se
s 083 _—C, are iach Mien Meee au eee
At 35°5°—
Collidine 1:0 cs ee ae ee en nes re em Te
At 15°5—
Acridine 0°1 SS ieee

|
|
|
+

as hydrochoride 0-01 pc.
At 35°5°--
Acridine hydrochloride 0-01} — | —| —| —-|—]—-—|;-/—|]—-]j]-
a) pre:

fs ™~"
Va
J

— 1885.] Studies of Disinfectants by New Methods. 263.

within 1 per cent. the least amount of the disinfectant which has the
effect of destroying the germ life.

The order of activity seems to be as follows :—Parvoline, acridine,
collidine, pyridine, lutidine, picoline.

Here also the effect of the bases at the higher temperature is very
evident and marked; 1°15 per cent. of lutidine at 15°5° failed to
disinfect, for growth was evident and vigorous by the sixth day; but
0°5 per cent. acting for twenty-four hours at 35°5° disinfected perfectly.
Similarly, 0°1 per cent. of acridine disinfected perfectly at 35°5°, but
not at the lower temperature.

It was probable enough that the empyreumatic products of tobacco,
consisting to a considerable degree of members of the pyridine
series, would also be disinfectant. The smoke from an ordinary
pipeful of common shag tobacco was pulled through a few c.c. of
sterilised water. In this tobacco-water threads infected with the
bacterium were soaked for twenty-fours, and afterwards submitted to
cultivation, but no growth resulted.

It may not be rash to infer that the cavity of the smoker’s mouth
during the act of smoking, is likely to have a disinfecting action on
any bacteria which may at that time gain access.

Alkaloids.—Hixperiments were made on certain of the alkaloids by
the “thread ” method.

The exact manner in which the alkaloids were dissolved, &c., was
as follows :—Brucine and strychnine were respectively converted into
chlorides and the neutral salt dissolved in 20 per cent. alcohol so as to
make a 2 per cent. solution.

Sulphate of atropine was dissolved in 20 per cent. alcohol.
Quinine sulphate was in one experiment dissolved in 20 per cent.
alcohol with the addition of a sufficient quantity of hydric sulphate
to ensure solution; but in another experiment the acid was omitted,
a saturated solution of the quinine being used instead ; this saturated
solution was made by boiling the salt for a few minutes, and then
allowing the solution to cool. A solution thus made equals 0°3 per
cent. of anhydrous quinine sulphate.

Morphine was used in the form of acetate. Theine was simply
dissolved in the weak alcohol without further preparation.

The results are given in the table, from which it will be seen that
strychnine, brucine, quinine, and atropine all destroyed the bacterium
in from 0°25 to 0°5 per cent. strength. The saturated aqueous solu-
tion of quinine permitted growth on the sixth day when acting at
ordinary temperatures, but when the action took place at the heat
of the body then sterilisation was effected.

It is noteworthy that solutions of morphine acetate of 1 per cent.
strength seem to have no disinfecting properties.

264 Mrv A.W: Bigth.. ~ > “ [Nove@a;

Alkaloids.

Days...cseee| 2 | 3..| 40:15. 16. | 7.) Bl |) s Or ane tetas

At 15° to 16°5°—
Strychnine 0°02 p.c...] —
si 0°04. =
” Ors; a
O01 T
5 0:02 =
os 0°25 =
5 Le og0r of Se - tibiae o -
” 1:00 » “@
Brucine 0°01 oa
. 0°02 =
” O25 5, a me io i ane Mainth- la on
03 050 —,, 77
Quinine sulphate dis- | —
solved by means of
acid in water 0°5 p.c.
Quinine sulphate dis-} — | — | —|—-—|]—]—|—-|]—-|]|—-]-]|-
solved by means of
acid in water 1:0 p.c.
Quinine sulphate in| — | — | — |] —] +
water 0°3 per cent.
At 35°5°—
Ditto so. csesevecess| — | — L— | = |) =) =) =e
At 15° to 16°5°
Atropine sulphate 0°5
per cent.
Aniline water 1:9....] — | +
> ZO —
“ Ot Fee a.
Theine 1 per cent. ....
Morphine acetate 0°5
per cent.
Morphine acetate 1:0) — | — | — | — | —} +
per cent.
Control .,....} +

f++4++

|
|
|
|
|
|
|
|
|
|

[e+ |

|
|
|
|
|
|
|
|
|
|

|
|
|
i}
|
|
|
|

eal lea
|
+] 1+
|
|
|
|
+

Ferrous Sulphate——Infected threads steeped many hours in a
saturated solution of ferrous sulphate (16°7 per cent.) afterwards
developed a strong growth, thus confirming other researches as to
the unreliability of this salt as a disinfectant.

Potassic Permanganate.—Hxperiments on the action of potassic per-
manganate were made by the thread method. As the infected thread
was immersed in a large volume of the disinfectant, the latter acted
under more favourable conditions than are likely to occur in actual
practice, in which there will be usually a quantity of easily broken
up organic matter, decomposing the permanganate, and thus in
effect removing it.

The results are given in the table, from which it appears that no

1885.] Studies of Disinfectants by New Methods. 265

true disinfectant action takes place until the strength reaches 1 per
cent.

Ferrous Sulphate and Potassic Permanganate.

Dry ation aed 5. InGesle eal Ss ie ON WO, 4) 11:

——— ee ee ee ee ee ee ee

At 16°—
Ferrous sulphate (saturated)
16°7 per cent.
Ferrous sulphate 84 per cent| — | — | — | — | +
Ferrous sulphate 5 per cent. .) — | — | — | — | +
Herrous sulphatel:6 per cent.| — |; = | — | — | +
At 35°5°—
Ferrous sulphate 1:6 percent.|. — | — | — | — | — | +

|
|
|
|
|
|
|
+

At 16°—
Potassic permanganate 0°01; — | +

per cent.
Potassic permanganate 0°04) — | +

per cent.
Povesempermaneanates lO) 6) y=) i — 1) yi)
per cent.
At 35°5°—
Potassic permanganate 0:04); — | — | — | —/|—|—J|+
per cent.
Potassie permanganate 04) — | = | — | — | —|—|—| +

per cent.
Controls seis | |

Halogens.—Since minute quantities of the halogens have a very
decided inhibitory action on growth, the thread method of investi-
gation was thought more suitable. Sterilised threads were, therefore,
infected with the bacterium, and submitted for twenty-four hours to
chlorine, bromine, and iodine water of known strength, the thread
being afterwards soaked in distilled water to free it from all traces
of the halogen, and then planted in gelatin. The results are not
essentially different from those obtained by other observers, and fully
confirm the great disinfecting power of the halogens, 0:01 per cent.
solution of any of the three being sufficient to destroy the bacterium.
Of the three, chlorine is the most active.

266 Mr, A. W. Blyth. [Nov. 26,

Chlorine, Bromine, Iodine.

Days....0s..| 2 | 3 | & | 5.| 6.1.7. | 8.4 9. | SO eee

Chlorine 0001 p.c...
i ©0025 «1.
OOO. oh
gees a ot ae
BOM be ip

Iodine “O-001) .,.. «i.
Ey) HOO hee 2

NP i) MOO se,
nt 0-01 iE

Bromine 0°001 ,, ..
55 RODE
nears. ds
5 OOM e e
Control ys iiss 3.0

5 ta) 02 (snl moma bg I | ene Ue oa Let
|
|
|
|
|
|
|
|
|

2. Hxperiments on the Disinfection of Sewage.

In the following series of experiments an entirely different method
of procedure was adopted. The number of colonies in a gram
of sewage or other suitable liquid was carefully determined by a
modification of known methods.

The same sewage was then treated by substances the disinfectant
properties of which formed the subject of inquiry, and the number of
colonies capable of growing in a nutrient soil, representing the micro-
organisms which had escaped destruction, again enumerated.

1885. ] Studies of Disinfectants by New Methods. 267

The only special apparatus used requiring description is the “ drop-
bottle ” and the “rings and plates.”

The Drop-bottle—The figure represents its shape and size, the
capacity is about 25 c.c. The stopper is hollow and terminates in
a pipette; it has a pin-hole at a, which can be closed by the
finger.

The Glass Plates and Rings.—The glass plates were 4 by 2 inches
square, the rings 4 inches in diameter, $ inch thick, and { inch high.
The plates had a ground surface the size of the ring thickness; the
rings were cemented to the plates in the following manner. After
heating the rings and plates in a hot air oven for many hours a little
peptone gelatin was run on to the ribbon of ground surface, the ring
adjusted, and the whole allowed to cool in a glass chamber formed by
a small dish covered by a slightly larger one; at the bottom of the
dish was some filter-paper moistened with a solution of mercuric
chloride. The plates were not used until the gelatin cement had
perfectly set. I should also add that the plates were ruled by means
of a diamond into squares for the purpose of easy enumeration.

Solid substances, such as ferrous sulphate, were weighed and dis-
solved in definite quantities of the sewage; in other cases solutions
of known strength were mixed with the sewage. The time during
which the disinfectant acted was, as a rule, twenty-four hours.

The method of cultivation was as follows:—A small quantity,
whether of diluted or disinfected sewage, was transferred to the
previously cleansed and sterilised drop-bottle, the bottle and its
contents carefully weighed, then by means of the pipette stopper
one or two drops spotted on to the surface of the glass cell formed
by the plate and ring already described; the weight of the drops was
ascertained by reweighing the drop-bottle.

Ordinary nutrient gelatin liquefied at a gentle heat was run from
a Lister flask into the glass cell, and mixed equally with the drops by
inclining the plate in different directions. During these several
operations dust was excluded as far as possible by covering the glass
cell by a second glass plate, merely shifting the plate sufficiently on
one side to allow the insertion of the nozzle of the Lister flask or the
point of the pipette. The cells thus charged were placed in the
moist chamber; the gelatin rapidly set, and at the end of from three
to five days the colonies of growth were counted in the usual way
and their general nature determined.

The weight of the drop or drops taken varied from 20 to 100 mers.,
the gelatin in which the drop was cultivated from 15 to 20 grams,
so that the minute quantity of disinfectant contained in the drop
itself was diluted from 200 to 1000 times. This amount of dilution
with the comparatively weak percentages of disinfectants used would
reduce the action of the disinfectant on the gelatin, the cultivating

268 Mr. A. W. Blyth. [Nov. 26,

soil—to a minimum, so that practically as soon as the micro-organisms
still surviving were floated into the nutrient gelatin they were
removed from the sphere of disinfectant influence.

Phenol and Cresol.—lt is of importance to know the relative dis-
infectant powers of phenol and cresol, and for this purpose the
following comparative experiment was made. Two quantities of
sewage were respectively treated with phenol and cresol, so that
the mixtures were equivalent to 1°9 per cent., and allowed to act for
twenty-four hours; the mean of two strictly concordant experiments
gave the following as the number of colonies which at the end of
four days could be enumerated—

No. of colonies per gram
of the sewage

taken.
Esl ates ¢1 8) Bee manepere, He oe Sue PRR eae om oR ayn oo,0a0
CrESial otis esanak & eae eho ie ieccees checjey S caecchacde eae 33,410
hs Goninon 5.625... «tare Bi byaanpeet a <Pate 1,490,000

None of the colonies in the disinfected sewage liqnefied the
gelatin. The fungi which developed after the treatment with
phenol were to the other colonies as 3: 5, the fungi in the cresol
experiment were to the other colonies as1:7. Weight for weight,
pure crystalline phenol and pure liquid cresol seem to be about
equal in disinfectant power.*

In another experiment 10 grams of phenol and 10 grams of cresol
were mixed respectively with 90 grams of pure calcic hydrate.
1 gram of each of these powders was digested with 100 grams of
sewage for twenty-four hours. The results of the cultivation were
as follows :—

No. of colonies per gram
of the sewage

taken.
Phenol ime’ j33 4c hase oe eee 311
Cresol Jimie! 2"... s/o) 5e ec oe ee ee 118
Control... S628. Gas ox see ee 1,490,000

Ferrous Sulphate-—A saturated solution of ferrous sulphate was
made by boiling the crystals in water, allowing to cool, and then
filtering from the deposited crystals. The strength of the solution

* Mr. J. P. Laws, F.C.S., in some recent experiments on the disinfection of the
Bacillus anthracis, found the relative “restraining ” power of phenol and paracresol
to be as 2 : 8, the killing power as 2: 5; hence he gives some superiority to cresol
as regards B. anthracis. His samples were both crystalline, and obtained from
Kahlbaum and made from the benzene and toluene sulphonates of potassium
(Fourteenth Annual Report Local Government Board, Supplement—Medical
Officer. London, 1885, p. 209).—December 23, 1885.

1885. ] Studies of Disinfectants by New Methods. 269

was ascertained to be equal to 16°75 per cent. of the anhydrous sul-
phate.

Equal volumes of the saturated solution and of the sewage were
mixed together, and drops weighed out and cultivated at the end of
one and twenty-four hours respectively. The results of these experi-
ments were as follows :—

No. of colonies per gram
of the sewage

taken.
Sewage containing 8°37 per cent. of
ferrous sulphate acting for 1 hour .. 1,250
Sewage containing 8°37 per cent. of
ferrous sulphate acting for 24 hours 572
MEWERCOMEEOLS: Gels wot ce ws ee ole. 1,490,000

Ferric Perchloride——A. solution of perchloride of iron was added
to sewage in such proportion that the mixtures of sewage and iron
represented 16°4, 9°2,and 5°3 per cent. of ferric perchloride ; the three
mixtures were placed on one side at the ordinary temperature for
twenty-four hours, weighed drops of each were then taken for culti-
vation.

No. of colonies per gram
of the sewage

taken.

1. Sewage treated with ferric chloride
RG AEP COM: Sy cts eG elie teins oe SSeS 20,856

2. Sewage treated with ferric chloride
Ne CT OOM a 5 0y 6 ap wif ws ay acettn. ile’ d wie gets 35,294

3. Sewage treated with ferric chloride
Ma PEL COME. <sssrew. sare ss fra cies sisrelete ore 42,444
Canbrobirs shea i he ies he Lo 1,490,000

It was noted that the colonies developed comprised all classes
of micro-organisms—mucors, aspergilli, bacilli, bacteria, and micro-
cocci having all their representatives.

The proportion of fungi to the other growths was carefully deter-
mined with the following results:—No. 1, the number of fungoid
growths to the rest was as 1:48; in No. 2, as1:5; in No. 3, as
1:4.

Zine Chloride—In the same sewage which formed the subject of
the previous experiments zine chloride was dissolved, and the solu-
tions allowed to act for twenty-four hours. The following table gives
the strength of the solutions, and the number of colonies which were
enumerated after four days’ cultivation.

970 | Mr. A, W. Blyth. [Nov. 26,

No. of colonies per gram
of the sewage
taken.

Sewage containing 5°22 per cent. zinc chlo-

TALS” onc tes Cen ee oe eee ancy os ae 6206
Sewage containing 11°75 per cent. zinc chlo-

HidG .'5..) (eee pee oo aiceetee ee 5764
Sewage containing 15°67 per cent. zinc chlo-

PMC 6 s.u.0,5 cout ome Rais ome Ale eee ae ee 1333

Mercuric Chloride—Equal volumes of a 0°l per cent. solution of
mercuric chloride and sewage were mixed together and allowed to act
for twenty-four hours.

To another portion of the sewage mercuric chloride was added so
as to be in the exact proportion of 071 per cent. ; this also was allowed
to act for twenty-four hours.

The result was as follows :—

No. of colonies per gram

of the sewage
taken.

Sewage containing 0'1 per cent. of mer-

enuwe ehlertde: -..0 se aaie onion ee 550
Sewage containing 0°5 per cent. of mer-

CHrie Chlgrge.. .\2i.o.0) sa cme eke 77
Sewage undisintected -..0. 2x ose cee 1,490,000

Chloride of Lime.—A gram of chloride of lime of average quality
was added to 100 grams of sewage and placed in an incubator set at
37°; after twenty-four hours weighed drops of the sewage were
cultivated.

At the same time 2 grams of chloride of lime were added to
100 grams of the sewage and digested for twenty-four hours, at the
ordinary temperature, and cultivated side by side with the above. In
‘each the sewage had a very distinct odour of chlorine.

The result of the cultivation was as follows :—

No. of colonies per gram
of the sewage

taken.
Chloride of lime 1 gram, sewage 100 grams
at SA? Shee EEA Pees Cae eee — 46
Chloride of lime 2 grams, sewage 100 grams
ati UW igo kee Ree ee As Lees hes 1638

Aniline-—1 gram of sewage was added to 99 grams of saturated
aniline water, allowed to stand at the ordinary temperature of the
atmosphere for twenty-four hours, and then ses weighed out and
cultivated.

1885. ] Studies of Disinfectants by New Methods. 271

On the fourth day of cultivation the colonies produced were calcu-
lated to be equal to 33,846 per gram of the original sewage, which
when not disinfected yielded 1,490,000 per gram. It was noted that
the fungi were to the other organisms as 4: 7. About 1500 of the
colonies were of the class that liquefy the gelatine.

Quinine Sulphate.—A saturated solution of quinine sulphate was
made by boiling the crystals with water, allowing to cool, and filtering
from the crystals which separated. The strength of this solution was
ascertained by evaporating 10 c.c. to dryness in a tared platinum dish.

_ It was found in this way to be equal to 0°3 per cent. of the anhydrous

sulphate.

1 gram of sewage was mixed with 50 grams of the saturated solu-
tion, and after acting for twenty-four hours drops were weighed out
and cultivated.

The colonies developed at the end of five days were noted to be
about one-half composed of fungi, and to equal 48,936 per gram of
the original sewage, which, as previously stated, contained 1,490,000
per gram.

Terebene.—20 c.c. of terebene were added to 100 c.c. of sewage and
digested with frequent agitation for twenty-four hours at the common
temperature. In this way the sewage was saturated with as much
terebene as the conditions would allow, the excess separating and
floating in an upper stratum. A small quantity of the lower liquid
was transferred to the weighing bottle, and some drops weighed out
for cultivation.

At the end of four days the number of colonies were only equal to
83 per gram of the original sewage, nor did any fresh colonies make
their appearance even after keeping the cell in the moist chamber for
ten days.

Potassic Permanganate.—Two flasks, each containing 1 gram of
crystallised permanganate, were submitted for twenty-four hours to
different temperatures, viz., the one at 18°, the other in an incubator
set at 37°

The sewage used was the same as in the former experiments, and
contained over a million and a quarter of centres of growth when
cultivated in its normal state.

The sewage and permanganate which had been placed at the lower
temperature yielded on cultivation colonies of micro-organisms equal
to 171 to the gram, but that which had been incubated at 37° showed
no sign of growth.

Ammonia, hydroxylamine, methylamine, ethylamine.—Solutions of
ammonia, hydroxylamine, methylamine, and propylamine were made
twice the strength of normal; that is to say, that double the equi-
valent of ammonia (17), of hydroxylamine (383), &c., was dissolved
in a litre of water. To one volume of each of these solutions one

VOL. XXXIX. t

272 Mr. A. W. Blyth. [Nov. 26,

volume of sewage was added, and the whole allowed to rest at the
ordinary temperature for twenty-four hours, at the end of which
time drops of each were weighed out and cultivated in the usual
manner. The control was the same sewage diluted with an equal
bulk of sterilised water. }

The results were as follows :—

No. of colonies per gram
of the sewage

taken.

Hydroxy lame teers ss lee nee 50
Methylamiume’ ne: os ee eee 180
Eithylamine ss 0 see ec, ene 181
Propylamine™. 2 s.q5 5-6. eee 237
AMMO nWIA ee ese: ee ee 257
COMErOl se fat se he ere ee 6250

3. The Action of Disinfectants on Typhoid Hacreta.

Kberth, Klebs, and Gaffky have each described micro-organisms
which they consider peculiar to abdominal typhus, 7.e., enteric or
typhoid fever. Gaffky has specially studied the question, and
describes, with great minuteness, the manner of growth of a bacillus
which he found in twenty-six out of twenty-eight typhoid bodies
(Gaffky, ‘‘ Zur Oetiologie des Abdominal Typhus.” ‘“ Mittheilungen
aus dem Kaiserlichen Gesundheitsamte,” 2 Band, Berlin, 1884). The
bacillus grows in nutrient gelatin, in light brown colonies, which do
not liquefy the gelatin; if a minute portion of one of the colonies be
taken up on a needle and transferred to a drop of water for micro-
scopic observation, the bacillus is seen to have the power of self-move-
ment. If the bacillus is sown on sterlised potatoes, a peculiar sort
of pellicle in about forty-eight hours is produced, formed wholly of
bacilli. The method of growth on gelatin, on potato, and the
power of self-movement, taken together, Gaffky considers to belong
to no other bacillus hitherto described. At the ordinary temperature
no spores were formed, but they were readily produced when the
bacillus was cultivated on potato at a blood heat.

Gaffky, although seldom failing to find this bacillus in typhoid
bodies, could not detect it in the excreta.

In the study of the action of disinfectants on typhoid excreta, it
was necessary to first determine the number of colonies. which could
be raised by cultivation from a gram of the typhoid matter operated
upon, and also search for any distinctive organism.

From a typical case of typhoid fever, on the tenth day of the
disease, a small quantity of the typhoid stool was obtained; it was —
very liquid, offensive, of a light brown colour, and free from blood.
A portion of this was weighed and diluted with sterilised water, so

1885.] Studies of Disinfectants by New Methods. 273

that the solution equalled 5 per 1000. Weighed drops of this solution
were cultivated, and the number of colonies obtained enumerated.
According to the mean of four experiments the number per gram of
colonies of all kinds in the original typhoid stool was 1,031,250.

Of these various growths 40 per cent. were forms of mucor and asper-
gillus, about 20 per cent. were bacilli, bacteria, and micrococci, which,
from their manner of growth and general characters, seemed to belong
to common and familiar forms, and were not farther investigated.

Besides these there were some light brown colonies which grew
slowly, the one generally in almost circular spheres, the other in
flatter irregular wart-like masses; neither of these growths while
cultivated on the thin sheet of gelatin-peptone in the glass cell
seemed to liquefy the gelatine, that is, within five or six days of culti-
vation, for observation could not be carried on longer than this period,
other common organisms, sueh-as B. termo, liquefying the whole mass
and mixing up the colonies. It was, therefore, necessary for the
farther study of these brown colonies (which might be Gaffky’s
bacillus) to obtain of each pure cultivations. For this purpose a
minute quantity of each was transplanted into a test tube of nutrient
gelatin by means of a sterilised platinum wire; from this cultiva-
tion a second was produced, and from the second a third. As the
general behaviour of the various cultivations never altered, nor could
any foreign element be detected, the last cultivations were considered
_ to be pure, and from these the surface of sterilised slices of potatoes
were inoculated. The bacillus, which may be referred to as bacillus (a),
and which grew in a more or less spherical manner in the sheet
gelatin, when transferred to a test-tube of solid gelatin-peptone,
liquefies very slowly the gelatin, growing always in contact with the
air. On potato it extends asa dirty scum. The bacilli examined in
water showed no power of self-movement. The irregularly growing
brown colony, which may be called bacillus (b), also very slowly
liquefies the gelatin, but only along the track of the needle. A
test-tube cultivation at the end of from fourteen to twenty days has
the following appearance. Along the track of the needle there is
a cone-shaped perfectly liquid mass. On the surface of the liquid
float little detached white-brown colonies; at the bottom is a white
deposit composed of colonies which, having been formed on the
surface in contact with the air, have slowly sunk. The lquid inter-
vening between the deposit and upper floating colonies is perfectly
clear. On potato the bacillus grows rapidly, forming an irregularly-
shaped brownish crust, and ultimately presents an appearance very
similar to the common wall lichen (Parmelia parietina).

Whether these bacilli have any connexion with the typhoid state or
not, the characters described are quite different from those of Gaffky's
bacillus.

7 2

274 | Mr. A.W. Blyth, [Nov. 26°

Whatever their significance may be, they were for this particular
sample of excreta distinctive, and moreover had such a special manner
of growth that they could be readily recognised by the unaided sight, ~
so that their presence or absence in the succeeding experiments could
be easily noted.

The disinfectants first experimented upon were some in common
use, such as ferrous sulphate, cresol, and potassic permanganate.

Ferrous Sulphate.-—To the 0°5 per cent. typhoid water crystals of the
sulphate were added and allowed to remain at the ordinary tempera-
ture for twelve hours, crystals at the end of that period were still
undissolved, so that in effect the solution was saturated.

Of this liquid a quantity equal to 125 mgrms. of the original typhoid
stool was taken for cultivation. Growth was rapid; at the end of
three days fifteen colonies were counted, composed of common
liquefying bacteria and bacilli; besides these, there were sixty-five
others which did not liquefy the gelatine, 7.e., within the same time,
among which were to be found both kinds of the light brown bacilli
above described. The total number of colonies calculated per gram of
the original typhoid matter, which had escaped destruction, were thus
640.

Oresol.—The crude carbolic acid of commerce, so largely used for
disinfecting purposes, 1s a mixture of phenol and cresol with small
quantities of other tar principles. ‘The cheapest carbolic acid may be
considered impure cresol, all phenol that the manufacturer can
possibly crystallise out having been removed; hence in the following
experiments with Calvert’s cresol some information is obtained as
to the value of the disinfection of typhoid matters as ordinarily
performed.

An exact 1 per cent. solution of cresol was made in typhoid water,
and drops weighed ont, at the end of fifteen minutes, three hours,
and twenty-four hours respectively.

The number of colonies per gram of the original typhoid matter
appearing at the end of four days’ cultivation was as follows :—

No. of colonies per gram
of typhoid matter

taken.
Cresol acting for 15 minutes ......... , 89
” Hs 3 HOUrS=). pulse om
PALME ae a ao

99 99

The brown colonies were not detected in the last cultivation, but
were present in the others.

The experiments were next extended to the amines and to the
pyridine series, substances, the action of which on Bacteriwm termo
and on sewage had already been studied.

—1885.] Studies of Disinfectants by New Methods. 275

Ammonia, hydroxylamine, and the amines.—The same strength of
solution of ammonia and the amines employed in the treatment of
sewage was also used in the experiments on typhoid matter.

The 0°5 per cent. of typhoid stool was diluted with an equal volume
of these solutions, with of course the result that every 100 parts
contained by weight one-tenth of an equivalent of ammonia,
hydroxylamine, and the amines, and 0°25 per cent. of typhoid matter.

As a control one volume of typhoid water was diluted with one
volume of sterilised water and cultivated side by side with the others.
At the end of four days the colonies were enumerated, the light brown
bacilli (a) and (0) were present as well as representatives of all others
seen in the control.

No. of colonies per gram
of typhoid matter

taken.

Mietinylamnnme’ ois ch Vie o's 14,350
IBL yd: Omsy AMIE S See Shs hal)! 6 22,222
Mola TINTTIee eines, fre state Get eke 33,933
Propylamine ....... ERE te, 8 73,913
/s SUUS0 TONLE alge ara re a geet BOI oP 103,703
AWecontrokec eset eet 900,125

The order in which the different amines stand is pretty well the
same as in the similar experiment on the disinfection of sewage (see
ante), but none of them seem to be strong disinfectants.

The Pyridine Series.—2 per cent. solutious of pyridine, C,H;N,
picoline, O,H,N, lutidine, C,H,N, and parvoline, CgH,,N, were made in
20 per cent. alcohol. Hqual volumes of these solutions were then
- mixed with equal volumes of the 0°5 per cent. typhoid water, and after
the end of twenty-four hours weighed drops were cultivated.

Pyridine.—The quantity taken for cultivation of the typhoid water
was equivalent to 0°5 mgrm. of the typhoid stool. After four days’
cultivation three colonies developed, two of these were common
moulds, the third a common bacillus.

Picoline.—After four days’ cultivation, a quantity of the solution
equivalent to 0°385 mgrm. of typhoid yielded fifteen colonies, five of
which were identical with the light brown bacillus (a) already
described.

Lutidine.—After four days’ cultivation, a quantity of the solution
equivalent to 0'62 mgrm. of typhoid stool yielded twelve colonies, all
of which seemed of a common kind.

Parvoline.—After four days’ cultivation, a quantity of the solution
equivalent to 0°85 mgrm. of typhoid stool yielded five colonies, five of
these were common forms of mould, one was the light brown bacillus
(b) previously described.

Hence with regard to the members of this series experimented

276 Studies of Disinfectants by New Methods. [Nov. 26,

upon, the number of colonies per gram of typhoid developed in a
normal solution acting for twenty-four hours was as follows :—

No. of colonies per gram
of typhoid matter

taken.
Parvolime, sCarl aN (2 oe ego ee 5,882
Pyridine Cael iNG ivan eae 6,000
Picolines CEN inn eee eee 16,949
otidime CAEN Ge ilsce eee 19,355

Summary.—From the three series of experiments certain general
conclusions may be drawn; these are as follows :—

1. The relative merits ee phenol and cresol as a disinfectant are
fairly equal, as shown by experiments on Bacterium termo and on
sewage, so that preference for one or the other must be determined
from considerations apart from degrees of activity.*

2. Ferrous sulphate as a disinfectant of Bacterium termo, of sewage,
and of typhoid excreta is shown to be unreliable. Hven strong
solutions fail to destroy all classes of micro-organisms. Considering
the extensive use of ferrous sulphate in cases of typhoid fever, and
that in both scientific and popular manuals ferrous sulphate is
confidently recommended as a disinfectant of specific excreta,it seems
important to accentuate the fact that my experiments are in their
result wholly opposed to the popular view and custom.

3. The experiments on the amines clearly show that the disin-
fectant action of members of that series differs in degree according to
the displacement of hydrogen by methyl, ethyl, propyl, or hydroxyl.
The connexion between chemical constitution and disinfectant
action is also seen in the experiments on the pyridine series, but is not
so marked.

4, Other things being deny the shorter the time a disinfectant
acts, the less the disinfection; this was shown very clearly in the
experiments on typhoid excreta treated with cresol for varying
periods of time. It, therefore, necessarily follows that even when
strong disinfectants are poured on to specific excreta, and the whole
within a few minutes thrown into a drain or cesspool, which by
great-dilution more or less removes the excreta from the sphere of
disinfectant influence, no true disinfection has been accomplished.

5. Disinfection is far more efficient at 35°5° to 37°, the temperatures
at which development and growth of micro-organisms is most active,
than at ordinary temperatures. This is shown in the experiments on
Bactertwm termo with phenol, cresol, lutidine, collidine, and potassic
permanganate, as well as in the experiments in the treatment of
sewage with chloride of lime and potassic permanganate.

* See foot-note on p. 268. °

1885. ] Anniversary Meeting. 277

November 30, 1885.
ANNIVERSARY MEETING.
Professor T. H. HUXLEY, D.C.L., LL.D., President, in the Chair.

The Report of the Auditors of the Treasurer’s Accounts on the
part of the Society was presented, by which it appears that the total
receipts during the past year amount to £6,134 7s. 2d., and that
the total expenditure in the same period amounts to £4,918 18s. 11d.,
leaving a balance of £1,183 1s. 3d. at the Bankers’, and £32 7s. Od.
in the ands of the Treasurer.

The thanks of the Society were voted to the Treasurer and Auditors.
The Secretary then read the following Lists :—
Fellows deceased since the last Anniversary.

~ On the Home List.

Andrews, Dr. Thomas. Montefiore, Sir Moses, Bart.
Arnott, James Moncrieff, F.R.C.S. | Pole, William, M.A.

Barlow, Peter William, F'.G.S. Selkirk, Thomas James, Earl of,
Carpenter, William Benjamin, E.G.S.

C.B., M.D. Teignmouth, Charles John Shore,
Davidson, Thomas, LL.D. Lord, D.C.L.

Field, Frederick, F.R.S.E. Vaux, William Sandys Wright,
Flight, Walter, D.Sc. M.A.

Guy, William Augustus, M.B. Voelcker, Augustus, Ph.D.
Houghton, Richard Monckton | Watson, Morrison, M.D.

Milnes, Lord, M.A. Weldon, Walter, F.C.S., F.R.S.E.
Jeffreys, John Gwyn, LL.D. Yolland, William, Colonel, R.E.,
Jenkin, Henry Charles Fleeming, C.B.

M.1.C.H.

On the Foreign List.

Henle, Franz Gustav Jakob. | Milne-Edwards, Henry.
Siebold, Karl Theodor von.

Chanyes of Name and Title.

Northcote, Right Hon. Sir Stafford Henry, to Harl of Iddesleigh.
Roberts, William Chandler, to Roberts-Austen.

278 Anniversary Meeting. [Nov. 30,

Fellows elected since the last Anniversary.

Baird, A. W., Major R.H. Hicks, Henry, M.D.
Bowen, Right Hon. Lord Justice | Hicks, William Mitchinson, M.A.
Sir Charles Synge C., Kt. Japp, Francis R., Ph.D.

Carpenter, Philip Herbert, D.Sc. | Marshall, Arthur Milnes, M.D.
Clark, Sir Andrew, Bart., M.D. Martin, Prof. Henry Newell, D.Se,
Common, Andrew Ainslie, F.R.A.S.] O’Sullivan, Cornelius.
Creak, Httrick William, StaffCom-| Perry, Prof. John.

mander R.N. Ringer, Prof. Sydney.

Divers, Prof. Edward. Vines, Sidney Howard, D.Sc.

Re-admitted.

James Bateman.

On the Foreign List.
Cornu, Alfred. | Dana, James Dwight.

The President then addressed the Society as follows :—

At the earliest opportunity after my return to England last spring,
I offered my very grateful acknowledgements to the Society for the
kindness with which the Fellows had condoned my enforced absence
from my post during the winter. And I should not venture to occupy
your time by recurring to the subject, did not the return of St.
Andrew’s day admonish me that duty and inclination alike require me
to offer my especial thanks to the Treasurer for the cheerful readiness
with which he took upon himself the burden of my duties, and the
efficiency with which he discharged them on our last Anniversary.

On the last occasion on which I had the honour to address yon, it
was my painful duty to commence by lamenting the death of a very
eminent member of the Society, who was, at the same time, one of
my oldest and most intimate friends. I deeply regret to find myself
once more in this position. The lamentable accident which has
deprived the Society of one of its oldest and most distinguished
Fellows, Dr. Carpenter, has robbed me of a friend, whose kindly
sympathy and help were invaluable to me five-and-thirty years ago,
and who has never failed me since.

You are all acquainted with Dr. Carpenter’s great and long continued
services to science as an investigator and as an expositor of remarkable
literary skill; and there must be many here who, having worked with
him in the University of London, of which he was so long Registrar,
are familiar with the high integrity, the energy, and the knowledge,
which marked him as an administrator. He was a man of varied
accomplishments outside the province of science, single-minded in
aim, stainless in life, respected by all with whom he came in contact.

Within the last few days, Physics has lost an eminent representa-

1885.] President's Address. 29)

tive in Dr. Thomas Andrews, of. Belfast. Among the cultivators of
Chemical Science we have to regret the decease of Mr. Field, who
was one of the original members of the Chemical Society; of Mr.
Weldon, and of Dr. Voelcker, whose names are well-known in con-
nexion with manufacturing and agricultural chemistry. In Biology,
we have lost Dr. Davidson, whose elaborate monographs on the fossil
Brachiopoda are remarkable examples of accurate malacological work
combined with artistic skill; Dr. Gwyn Jeffreys, the veteran explorer
of our marine molluscous fauna, and a high authority on conchology ;
and Dr. Morrison Watson, whose early death has cut short the career
of an anatomist of much promise. Mineralogy has suffered a
similar loss by the premature death of Dr. Walter Flight. In
Hngineering Science, we have to lament the deaths of Mr. Barlow
and Professor Fleeming Jenkin. I may be permitted to dwell fora
moment upon the latter name, as that of a most genial and accom-
plished man and a valued personal friend, with whom it had been my
privilege to be associated for a time in his well-directed and successful
efforts to improve the sanitary condition of our cities. The elder
generation of English geologists will remember the keen interest
which the Harl of Selkirk took in their pursuits. The death of Lord
Houghton robs us of a connecting link with all the world.

Three very distinguished names have disappeared from the ranks
of our foreign members: that of Henle, of Gottingen, among whose
many merits must stand that of ranking next after Schwann among
the founders of histology; that of the venerable Henry Milne-
Hdwards, of Paris, one of the most distinguished members of the
school of Cuvier, and admirable no less for his contributions to
zoological philosophy than for the extent and the precision of his
additions to our knowledge of facts; and lastly, that of Von Siebold,
of Minich, whose remarkable investigations into the phenomena of
parasitism and of sexless reproduction brought about the solution of
some of the most difficult problems of zoology, while it would be
difficult to exaggerate the influence of his wonderfully accurate and
comprehensive “ Handbook ” on the progress of invertebrate zoology
forty years ago.

On the Ist of December last year the total number of Hollows of
the Royal Society amounted to 519; of these 473 were on the home
and 46 on the foreign list. Deducting Her Majesty, our Patron, and
four other Royal personages, the number on the home list was 468.
At the present moment, we have 45 foreign members; while the total
strength of the home list (deducting Royal personages) is 465, or
three fewer than twelve months ago. The number of deaths in the
home list during the past year is 20. This is a larger mortality than
that of last year; and it still exceeds the number of Fellows added
to the Society by election, which during the past year was 16;

280 Anniversary Meeting. [Nov. 30,

namely, the statutory 15 Fellows elected in the ordinary way and
1 Privy Councillor.

As the Treasurer observed in his address on the last Anniversary,
it is obvious that we are rapidly approaching a state of equilibrium
between our losses and our gains; and under the present conditions
of election, the strength of the home list may be expected to remain
somewhere between 460 and 470.

While our number thus tends to remain stationary, the list of can-
didates for the Fellowship, though it has fluctuated a good deal from
year to year, has, on the whole, become longer, until, at present, the
candidates are more than four times as numerous as the annual
elections sanctioned by our rules. This state of things has given
rise to comment, both within and without the Society, on more than
one occasion. It has been said that any restriction upon the number
of our Fellows is unwise, inasmuch as we narrow our influence and
diminish our revenues thereby ; and, by way of a still more unpleasant
suggestion, it is hinted that, by such limitations, we lay ourselves
open to the charge of a desire to arrogate to ourselves the position of
the elect of science.

With respect to the first objection I venture to oan out, that the
influence of the Society upon the advancement of science is not by
any means measured either by its numerical strength or by the
amount of the funds at its disposal.

And, as to the second charge or insinuation, if 1t is worth while to
meet it at all (which may be doubtful), I am disposed to think that,
in another than the invidious sense of the words, it is highly desirable
that the Fellows of the Royal Society shouid regard themselves, and
be regarded by others, as the elect of science. An organisation which
was the direct product of the new birth of science in the days of
Gilbert, of Galileo, and of Harvey; which was one of the earliest of
the associations founded for the sole purpose of promoting natural
knowledge ; and which has so faithfully performed its functions that
it is inseparably associated with all the great strides which science
has made for two centuries, has insensibly and without effort become
a recognised representative of men of science in these islands: as
such, on the one hand, it is consulted by the Government on scientific
questions; and, on the other hand, it claims the right to be heard by
the Government on all questions of scientific interest. I believe it to
be impossible that the Society should discharge the functions which
it has not sought, but which have thus devolved upon it, satisfactorily,
unless it really does consist, in one sense, of the elect of science; that
is to say unless every care is taken to keep its scientific character at
the level of its scientific reputation, and to ensure that it shall be not
the mere figure-head of the scientific body, but a living association of
representative men engaged in all branches of scientific activity.

1885. ] President's Address. 281

Those among my hearers whose memories go back forty years will
remember that, at that time, the Society was in great danger of losing
its scientific character, though it would doubtless have taken it a long
time, and a good deal of perversity, to get rid of its scientific reputa-
tion. It had become the fashion to append F.R.S. to a name, and
the scientific members were in danger of being swamped by the
invasion of dilettanti. The aim of our eminent colleague, Sir William
Grove, and his friends, who fought the battle of 1847, and thereby,
to ny mind, earned the undying gratitude of all who have the
interests of science at heart, was not to create an academy of im-
mortals, but to save the Fellowship of the Society from becoming a
sham and an imposture. And they succeeded in their object by
carrying a measure of reform which embodied two principles—
the first, that of the practical responsibility of the Council for the
elections, the second, that of the limitation of the number of can-
didates annually elected. The result of the steady adherence of the
Society to these principles for thirty-eight years is that, year by
year, the Society has approached more and more closely to that
representative character which, I cannot but think, it is eminently
desirable it should possess.

During a great part of this time I have enjoyed more and closer
opportunities than most people of watching the working of our
system. Mistakes have been made now and then, no doubt, for even
members of Council are fallible; but it is more than thirty years
since the propriety of the selections made by the Council has been
challenged at a general meeting; and I have never heard a question
raised as to the conscientiousness with which the work is done, or
as to the desire of the Council to mete out even-handed justice to
the devotees of all branches of science. I am very strongly of
opinion that if the Royal Society were a ‘“‘Chamber of Science,”
subject to dissolution, and that after such dissolution a general
election, by universal suffrage of the members of all scientific bodies
in the kingdom, took place, an overwhelming majority of the present
Fellows would be re-elected.

Such being my conviction, it is natural that I should express a
fervent hope that the Society will never be tempted to depart from the
principles of the method by which, at present, it recruits its strength.
It is quite another question, however, whether it is desirable to
retain the present limit to our annual addition or to increase it.

There is assuredly nothing sacred in the number 15; nor any good
reason that I know of for restricting the total strength of our home
list to 460 or 470; so long as our recruits approve themselves good
soldiers of science the more we enrol the better. And if I may
pursue the metaphor, I will add that I do not think it desirable that
our corps should consist altogether of general officers. Any such

282 Anniversary Meeting. [Nov. 30,

exclusiveness would deprive us of much useful service, and seriously
interfere with the representative character in which our strength
hes. I think we ought to be in touch with the whole world of science
in the country, and constitute a microcosm answering to that macro-
cosm. Those who are in favour of making a change observe that the
limit of fifteen was fixed nearly forty years ago; that the number
of those who occupy themselves seriously with science and attain a
position which would undoubtedly have brought them into the
Society at that time, has increased and is constantly increasing ; and
that it is undesirable that we should be compelled to leave out of our
body, year after year, persons whom we should be very glad to see in
it. On the other hand, it is to be recollected that a change once made
can hardly be revoked, and that, in view of the importance of such a
step, the Society will do well to make sure of the consequences before
taking it.

I have thought it desirable to raise the question, not for the purpose
of suggesting any immediate action—for my personal opinion 1s that,
at present, no change is desirable—but in order that the attention of
the Fellows may be directed to a matter which I think is sure to
come before them in a practical shape before many Anniversaries go
by. And, whenever that time arrives, I think another problem may
possibly offer itself for solution. Since this Society was founded,
English-speaking communities have been planted and are increasing
and multiplying in all quarters of the globe—to use a naturalist’s
phrase, their geographical distribution is ‘“‘ world wide.” Wherever
these communities have had time to develop, the instinct which led
our forefathers to come together for the promotion of natural know-
ledge has worked in them and produced most notable results. The
quantity and quality of the scientific work now being done in the
United States moves us all to hearty admiration; the Dominion of
Canada, and our colonies in South Africa, New Zealand and Australia,
show that they do not mean to be left behind in the race; and the
scientific activity of our countrymen in India needs no comment.

Whatever may be the practicability of political federation for more
or fewer of the rapidly growing English-speaking peoples of the globe,
some sort of scientific federation should surely be possible. Nothing is
baser than scientific Chauvinism, but still blood is thicker than water ;
and I have often ventured to dream that the Royal Society might
associate itself in some special .way with all English-speaking men of
science ; that it might recognise their work in other ways than by the
rare opportunities at present offered by election to our foreign Fellow-
ship, or by the award of those medals which are open to everybody ;
and without imposing upon them the responsibilities of the ordinary
Fellowship, while they must needs be deprived of a large part of its
privileges. How far this aspiration of mine may be reciprocated by

~1885.] Prosident’s Address. 283

our scientific brethren in the United States and in our Colonies I do
not know: I make it public, on my own responsibility, for your and
their consideration.

I am anxious to call the attention of the Fellows to an alteration in
our rules; in virtue of which it is hoped that the valuable library of
the Society will be made more extensively useful to them by being
accessible up to a later hour than heretofore, and by better provision
for the comfort and convenience of those who desire to read or write
in the Society’s rooms.

The funds of the Society have been augmented in various ways
during the past year.

A few weeks ago, our distinguished colleague Sir William Armstrong
wrote to me proposing to make a very handsome, indeed, I may say,
munificent contribution to our finances. The precise form which the
gift should take was left open to discussion, and it was only at the
meeting of Council to-day that the matter was finally settled by the
letter addressed to me, on behalf of Sir W. Armstrong, by Captain
Noble, which I proceed to read to the Society :—

“Referring to the communications which have passed between
yourself and Sir W. Armstrong with regard to a proposed gift by
Sir William to the Society, I have had some discussion with Sir
W. Armstrong as to the form which his proposed donation should
take. }

‘Sir W. Armstrong is very anxious that the Scientific Relief Fund
Trust should be raised from £7,600, the amount at which I think it
now stands, to £20,000, and he has authorised me to say that if the
Fellows, with the assistance if necessary of other friends of science
outside of the Society, see their way to raise £6,500, he will himself
give a second £6,500, thus making up the desired sum.

‘““The only condition, or rather request, that he makes in connexion
with this gift is that, in the event of any Fellow being in such circum-
stances as to make the payment of his subscription burdensome to
him, the Council for the time being will order the payment of such
subscription out of the income arising from the Relief Fund.”

The President and Council have accepted Sir William Armstrong’s
generous gift, and have offered him their hearty thanks for it; they
have already been promised contributions by other Fellows of the
Society, and they trust that there will be no difficulty in making up
the sum required.

The value of the fee for the Croonian Lecture has been increased
from £2 18s. 9d. to about £50 a-year, by the falling in of certain
leases. :

Allusion was made in the Treasurer’s Address last year to the

284 Anniversary Meeting. | ‘[Nov. 30,

Darwin Memorial. I am happy to say that Mr. Boehm’s admirable
statue was formally and publicly accepted by H.R.H. the Prince of
Wales, on behalf of the Trustees of the British Museum, last
summer, and now adorns the entrance hall of the Natural History
Museum at South Kensington. The balance of the sum raised,
amounting to £2,000, has been handed over to the Royal Society, and
the interest thereof will be employed under the name of the ‘‘ Darwin
Fund for the Promotion of Biological Research” in any way the
President and Council may think fit. I.sincerely trust that this fund
may be increased from time to time, as the Donation Fund, founded
by Dr. Wollaston, has been ; and that its beneficent influence on the
progress of biological science may thus keep green the memory of the
oreat man whose name it bears, in the way which, assuredly, would
have been most agreeable to himself.

T am sure that I may express your acknowledgments to Mr. James
Budgett for the repetition of his liberal donation of £100 in aid of the
cost of publication of Professor Parker’s important and elaborate
monographs on the vertebrate skull, one of which occupies a whole
part of the Transactions, and is illustrated by 39 quarto plates.

We are indebted to the subscribers to the Henry Smith Memorial
for the marble replica of the bust by Mr. Boehm of that eminent
mathematician and most accomplished scholar, which now ornaments
our library. The Fine Art Society has presented Mr. Flameng’s etching
of the portrait of your President, painted by the Hon. John Collier.

Among the presents to the Library, I may particularly mention the
second volume of Professor G. Retzius’ valuable and splendidly
illustrated work “Das Gehér-organ der Wirbelthiere”; and ‘Les
Habitants de Surinam,” by the Prince Roland Bonaparte, by their
respective authors; and four volumes of the “‘ Challenger”’ Report,
by Her Majesty’s Stationery Office.

Five numbers of the “ Proceedings” (about 880 pages) have
appeared since the last Anniversary. Only one part of the Philoso-
phical Transactions has been as yet published; but two other parts
(Parts I and II for 1885) are passing simultaneously through the press.

The possibility of devising means by which papers read before us
may be publighed more rapidly, has seriously engaged the attention
of the Officers of the Society, and I trust that, before long, the
Council may have some well-conceived plan for achieving that end
brought under their consideration. While all will agree in deprecating
unnecessary retardation, it must be remembered that a certain delay is
absolutely necessary, if the Committee of Papers is to discharge with
due care its important function of arriving at a sound judgment,
after considering the opinions of responsible specialists on the merits
of each paper submitted to it. In substance, I do not think that we

1885. ] | President's Address. 285

ean hope to better our present arrangements; all that can be asked is
that they should be improved in some details, and more especially
that the time which necessarily intervenes between presentation and
publication should be minimised.

The preparation of copy for the Catalogue of Scientific Papers,
decade 1874—85, now approaches completion. A total of 290 series
have been indexed, giving 85,000 title slips, written, checked, and
distributed. This number, which is within 10,000 of that contained
in the two volumes of the preceding decade, nearly exhausts the
material in our own library; it remains to supplement this by
reference to other libraries.

At the meeting on the 18th of June last, our Fellow, Professor
Roy, communicated to the Council the project entertained by himself,
Dr. Graham Brown, of Edinburgh, and Mr. Sherington (G. H.
Lewes Student, Cambridge), of proceeding to Spain with a view of
investigating the nature of cholera, and requested the assistance of |
the Royal Society.

In view of the great practical importance of such an investigation,
and the desirableness of making a new attempt to solve a problem
about which highly competent inquirers have arrived at contra-
dictory results, the President and Council resolved to do everything
which lay in their power to assist Dr. Roy and his colleagues.
The Secretary was instructed to inquire of the Spanish Minister
whether the proposed investigations would be agreeable to the Spanish
authorities, and whether Dr. Roy might expect to obtain facilities and
assistance. On the receipt of a courteous and sympathetic letter
from his Excellency, the Secretary was further instructed to inform
the Foreign Office of Dr. Roy’s expedition, and to request that Her
Majesty's Government would afford him and his colleagues all the
assistance in their power. Moreover, £150 was granted from the
Donation Fund in aid of the expenses of the undertaking, which
were shared between the Royal Society and the Society for the
Advancement of Medicine by Research.

I am sure the Fellows of the Society will join with me in con-—
gratulating Dr. Roy, Dr. Brown, and Mr. Sherington on having
returned safe and sound from an adventure in which the interest of
scientific inquiry must have been heightened by a considerable spice
of personal danger. Dr. Roy has furnished me with a brief pre-
liminary report of the work done, the substance of which I proceed
to lay before the Society.

The members of the Commission met with very serious difficulties
in their attempts to study the pathology of cholera in Spain, where
they spent three months; but owing to the powerful support which
was given them by the English Embassy in Madrid, they were

286 Anniversary Meeting. [Nov. 30,

able eventually to pursue their studies in a satisfactory manner.
At Aranjuez and Madrid they obtained free access to the cholera
hospitals, and made nearly thirty autopsies of typical cholera cases
within very short periods after death. From all of these cases
they were able to obtain material for cultivation and thus to make
a large series of investigations on the different forms of micro-
organisms which are found in the tissues and intestinal contents of
cholera cases. Owing, however, to the impossibility of obtaining
animals for inoculation, and reagents of various kinds, they were
unable to complete their inquiry in Spain, and they were obliged to
leave the investigations of certain points until their return to
England. They have directed their attention chiefly to the relation
which the comma bacillus, first described by Koch, bears to the
cholera process, and they hope to be able to make important addi-
tions to our knowledge of this important subject. They are at
present engaged in completing their work, and in the course of a
few weeks they hope to be able to present their report to the Royal
Society.

The Marine Biological Association, to the funds of which the
Royal Society made a substantial contribution last year, is making
good progress. A site for building has been granted by the War
Office, at Plymouth; plans have been prepared, and if the Treasury
will follow the precedent which it has so largely and beneficially
adopted in educational matters, of helping those who help them-
selves, as I am glad to say my Lords seem inclined to do, I trust that,
before long, the laboratory will be in working order.

The prosecution of the borings in the Delta of the Nile, to which
reference has been made on previous Anniversaries, have unfortunately
been hindered by various obstacles. Quite recently I have been
favoured by Colonel H. Maitland, R.E., with an account of the
borings made near Rosetta, in which a depth of 153 feet was reached
without apparently attaining the bottom of the fluviatile deposits ;
and I hope that circumstances may shortly permit the resumption of
the original project of carrying a line of borings across the Valley of
the Nile on the parallel of Tantah or thereabouts.

In the meanwhile the Committee in charge of the imvestigation
has presented a report by Professor Judd on the results of the exami-
nation of the borings formerly made. I have been favoured by
Professor Judd with the following brief summary of these results,
which have been fully set forth in a paper read at the first meeting
of the Society after the recess.

Although two of the recent borings in the Nile Delta have attained
depths of 73 and 84 feet respectively, yet neither of them has reached
the rocky floor of the old Nile Valley, nor, indeed, have they afforded

1835.] President's Address, 287

any indications of an approach to the solid rock. The samples of
the Delta deposits obtained by these boring operations are found to
be in all cases mixtures, In varying proportions, of Nile mud, or
material carried In suspension by the river and desert sand, or parti-
cles swept in from the surrounding districts by the action of winds.
The study of these materials by the aid of the microscope has
revealed a number of facts which may be made the basis of generali-
sations of considerable interest to geologists.

The minerals present in these sands and muds are found to be such
as characterise the granitic, and highly crystalline metamorphic rocks ;
there can be litle doubt, therefore, that the vast regions included
within the Nile basin are in the main composed of rocks belonging to
those classes, or of sedimentary deposits derived directly from them.
Of still greater interest is the fact that the fragments of felspars
and other complex silicates in the Delta deposits exhibit but slight
evidence of kaolinisation or other chemical change. This points to
the conclusion that, in the rainless districts drained by the Nile, the
disintegration of rocks is effected by mechanical rather than by
chemical agencies. A very striking confirmation of this conclusion
is afforded by the study of the composition of the waters of the
Nile, our knowledge of which has been greatly advanced by the recent
researches of Dr. C. M. Tidy. In spite of the circumstances that the
waters of the Nile must undergo great concentration during its
passage of 1,400 miles through regions of exceptional heat and
drought, it is found that those waters actually hold in solution little
more than one-half the percentage of mineral matter which is present
in the river waters of temperate and rainy regions. The chemical
disintegration of rocks being so largely due to the action of rain and
vegetation, it is not surprising to find that where these agencies are
almost entirely absent the rocks exhibit but few signs of chemical
change.

The Krakatoa Committee, which is now rather a large one, con-
sisting of thirteen members, has been steadily at work during the
year; and the discussion of the very varied and large mass of data
has been undertaken by sub-committees, dealing respectively with
the following branches :— |

Geological—including eruption and earthquake phenomena, and
the geological features of the distribution of dust and pumice.

Meteorological (A)—including air waves, sounds, and the geo-
graphical distribution of dust and pumice.

Meteorological (B)—including twilight effects, coronal appear-
ances, cloud haze, coloured sun, moon, &.

Magnetic and electric phenomena.

Tidal waves.

WOU. KXXIX. U

BS Tks
288 _ Anniversary Meeting. [Nov. 30,

With the exception of the last-named Sub-Committee, viz., that
upon Tidal Waves, of which the work has been delayed by the illness
of Sir F. Evans, all the reports are now in a forward state, and there
seems to be every prospect of the work being concluded in the course
‘of a very few months.

The question of the proper administration of the funds adminis-
tered on behalf of the Government by the representatives of the
Royal Society and of other scientific bodies, who constitute the
Government Grant Committee, has frequently been debated with
much care by the President and Council, who are held responsible for
the final assignment of the grant by the Government.

On the 20th of May last the Council determined, once again, to
devote special attention to the subject, and on the 25th June the
minutes will inform you that the following resolutions were passed :—

“That in every case of renewed application for a personal grant,

after such grant has been received by the applicant in two consecutive
years, the application be made not less than three months before it is
to be considered, accompanied by a full statement of the case from
the applicant, and that before being presented to the Committee, it be
referred by the Council to two referees, who shall report to the
Council on its merits.”
_ “That the Secretaries be instructed to return to the applicants for
aid from the Government Grant such applications as do: not in all
particulars comply with the conditions laid down in the circular to
applicants.” 3 |

It is very desirable that our intention to enforce the latter resolu-
tion strictly should be widely promulgated. I may add that we have
considerable reason to complain that too frequently those who have ob-
tained grants through the Committee make no report of the work done
to the Society, but leave information on that head to reach us as it
may through the publications in which the results obtained by the
grantees are made known,

Nineteen large royal quarto volumes of the Official Reports on the
Scientific Results of the ‘‘ Challenger’ Expedition have now been issued
from the press. These contain thirty-seven zoological, three botanical,
and eight physical and chemical reports, together with the narrative
of the voyage, which contains the general scientific results of the
expedition. Six more volumes are now passing through the press, a
considerable part of each being already printed off. The work con-
nected with the remaining memoirs is in a forward state. The whole
of the investigations and the manuscript will be completed during the
next financial year, and in the course of the year 1887 the whole of

moss. |. President's Address, 289

the Reports will be published, and the work connected with the expe-
dition brought to a close.

In the Treasurer’s address last year the Society was fully informed
of the action taken by the President and Council in the matter of
the position of this country with respect to the international “ Bureau
‘des Poids et Mesures.” I am happy to be able to report to the Society
that, last December, we received a letter from the Treasury, stating that
my Lords had asked the Secretary of State to. instruct the British
Ambassador at Paris to make known to the Comité International des
Poids et Mesures that Her Majesty’s Government were willing to
join the Convention on the terms described in our Secretary’s letter
of the 18th August, 1884, and that the proposal had been accepted.

Your President is, ew officio, Chairman of the Board of Visitors of
the Royal Observatory. As such, it was my duty to preside at a
recent meeting of that body, when my colleagues agreed to recom-
mend the adoption of a day, commencing. at midnight, in all observa-
tories and in the Nautical Almanac, from and after the commence-
ment of the year 1891.

Much to my regret, I have been unable to take part in the work of
the City and Guilds Institute during the past year; but I have reason
to know that considerable progress has been made towards the
attainment of its object—the advancement of technical education in
London and in the provinces. The Finsbury Technical College is
fulfilling its purpose in the most satisfactory manner, and its day and
evening classes are so numerously attended that an extension of the
building is under consideration. About 250 technical classes in
different parts of the kingdom are now affiliated to the Institute, and
some of them are already developing into efficient technical schools.
The assistance which the Institute is enabled to afford to these classes
is restricted by want of means; but there can be no doubt that far
larger opportunities of obtaiing evening instruction in the appli-
cation of the different branches of science to industry are afforded
to the artisans of London now than was the case even four or five
years ago.

Large additions have been made to the equipment of the Central
Institution at South Kensington. The engineering laboratory and
the extensive chemical and physical laboratories are organised, and
the systematic instruction of students has commenced. Scholarships
of the value of £30 a-year, tenable for three years, have been offered
to and accepted by the Governors of a number of public and other
schools. These scholarships are to be awarded by the head master
(not necessarily on the result of a competitive examination) to any
pupil who is competent to pass the entrance examination of the
Central Institution.

u 2

290 Anniversary Meeting. [Nov. 30,

The City and Guilds Institute is the outcome of the perception of
the necessity for technical education, in the interests of industry, by
the wealthiest city and the wealthiest guilds in the world; it may,
therefore, seem singular that the chief obstacle to the proper
development of the important schools which it has founded is
poverty. Such, however, I understand to be the case. The Central
Institution requires an assured income of at least £15,000 a-year if
it is to work properly; but the joint resources of the City and Guilds
of London, at present, appear to be able to afford it only a precarious,
annually-voted, subsidy of £9,000 a-year—far less, that is to say, than
the private income of scores of dividual Londoners. In Germany,
a similar institution would demand and receive £20,000 a-year as a
matter of course; but Englishmen are famous for that which a
‘perplexed Chancellor of the Exchequer (I think it was) once called
their ‘“‘ignorant impatience of taxation,” and there is no occasion
on which they so readily display that form of impatience as
when they are asked for money for education, especially scientific
education. Jam bound to add, however, that my experience on the
Council and Committees of the Institute has left no doubt on my
mind that my colleagues have every desire to carry out the work they
have commenced thoroughly; and that the money difficulty will dis-
appear along with certain other difficulties which, I am disposed to
think, need never have arisen.

Such are the chief matters of business, if I may so call them,
which it is proper for me, in my Presidential capacity, to bring before
the Society. But it has been not unusual, of late years, for the occu-
pant of the Chair to offer some observations of a wider bearing for
the consideration of the Society; and I am the more tempted to
trespass upon your patience for this purpose, as it is the last
occasion on which I shall be able to use, or abuse, the’ President’s
privileges.

So far as my own observations, with respect to some parts of the
field of natural knowledge, and common report, with respect to others,
enable me to form an opinion, the past year exhibits no slackening in
the accelerated speed with which the physical sciences have been
growing, alike in extent and in depth, during several decades. We are
now so accustomed to this “unhasting but unresting” march of
physical investigation ; it has become so much a part of the customary
course of events, that, with every day, I might almost say with every
hour, something should be added to our store of information
respecting the constitution of nature, some new insight into the order
of the cosmos should be gained, that you would probably listen with
incredulity to any account of the year’s work which could not be
summed up in this commonplace of Presidential addresses.

1885. | President's Address. 291

Nor shall I be charged with innovation if I add that there is no
reason to suspect that the future will bring with it any retardation in
the advance of science. The adverse influences, which, in the middle
ages, arrested the work commenced by the older Greek philosophers,
are so much weakened that they no longer offer any serious obstacle to
the growth of natural knowledge; while they are powerless to prevent
the extension of scientific methods of inquiry and the application of
scientific conceptions to all the problems with which the human mind
is confronted. If any prophecy is safe of fulfilment, it is that, in the
twentieth century, the influence of these methods and conceptions
will be incomparably greater than it is now; and that the inter-
penetration of science with the common affairs of life, which is so
marked a feature of our time, will be immeasurably closer. For good
or for evil, we have passed into a new epoch of human history—the
age of science.

It may seem superfluous that I should adduce evidence in support of
propositions which must have so much of the nature of truisms to
you who are sharers in the work of science and daily witnesses of the
effects of its productive energy. But the proverbial tendency of
familiarity to be incompatible with due respect is noticeable even in
our appreciation of the most important truths, and our strongest con-
victions need furbishing up now and then, if they are to retain their
proper influence. I certainly cannot accuse myself of ever having
consciously entertained a low estimate of the past work or the future
progress of science; but, a few months ago, enforced leisure and the
attainment of an age when retrospection tends to become a habit, not
to say a foible, led me to look at the facts anew ; and I must confess
that the ‘spectacle of the marvellous development of science, alike in
theory and practice, within my own life-time, appeared to me to
justify a faith, even more robust than mine, in its future greatness.

For, if I do not greatly err, the greater part of the vast body of
knowledge which constitutes the modern sciences of physics, chemistry,
biology, and geology has been acquired, and the widest generalisations
therefrom have been deduced, within the last sixty years; and fur-
thermore, the majority of those applications to scientific knowledge to
practical ends, which have brought about the most striking differences
between our present civilisation and that of antiquity, have been
made within that period of time.

To begin with the latter point—the practical achievements of
science. The first railway for locomotives, which was constructed
between Stockton and Darlington, was opened in September, 1825,, so
that I have the doubtful advantage of about four months’ seniority
over the ancestral representative of the vast reticulated fetching and
carrying organism which now extends its meshes over the civilised
world. I confess it fills me with astonishment to think that the time

207) Anniversary Meeting. [Nov. 30,

when no man could travel faster than horses could transport him,
when our means of locomotion were no better than those of Achilles
or of Ramses Maimun, les within my memory. The electric tele-
graph, as a thing for practical use, is far my junior. So are arms
of precision, unless the old rifle be regarded as:such. Again, the
application to hygiene and to the medical and surgical treatment of
men and animals, of our knowledge of the phenomena of parasitism,
and the very discovery of’the true order of these phenomena, is a
long way within the compass of my personal knowledge.

It is unnecessary for me to enumerate more than ‘these four of the
many rich gifts made by-science to mankind during the last -sixty
years. Arresting the survey here, I would ask if there is any corre-
sponding period in previous history which can take credit for‘so many
momentous applications: of scientific knowledge ‘to the wants of
mankind? Depreciators of the value of natural knowledge are wont
to speak somewhat scornfully of these and such-like benefactions as
mere additions to material welfare. I must own to the weakness of
believing that material welfare is highly desirable in itself, and I
have yet to meet with the man who prefers material ilfare. But
even if this should be,:as some may say, painful evidence of the
materialistic tendencies incidental to scientific pursuits, it is surely
possible, without much ingenuity, or any prejudice in favour of one
or other view of the mutual relations of material and spiritual
phenomena, to show that each of these four applications of science
has exerted a prodigious influence on the moral, social, and political
relations of mankind, and that such influence can only increase as
time goes on.

If the senseless antipathies, ‘born of isolation, which formerly
converted neighbours, whether they belonged to adjacent families
or to adjacent nations, into natural-enemies, are dying away, 1m-
proved means of communication deserve'the chief credit of the change;
if war becomes less frequent, it will be chiefly because its horrors are
being intensified beyond bearing by the close interdependence and
community of interest thus established between nations, no less than
by the improvement of the means of destruction by scientific inven-
tion. Arms of precision have taken the mastery of the world out
of the hands of brute force, and given it into those of industry and
intelligence. If railways and electric telegraphs have rendered it
unnecessary that modern empires should fall to pieces by their own
weight as ancient empires did; arms of precision have provided against
the possibility of their being swept away by barbarous invasions.
Health means not merely wealth, not merely bodily welfare, but
intellectual and moral soundness; and I doubt if, since the time of
the father of medicine, any discovery has contributed so much to the
promotion of health and the cure of disease as that of the part played

1885.] President's Address. 293:

by fungoid parasites in the animal economy, and that of the means
of ee them, even though, as yet, unfortunately, it be only in a
few cases.

- But though these practical results of scientific work, during only
two generations, are calculated to impress the imagination, the
Fellows of this Society know well enough that they are of vastly less
real importance than the additions which have been made to fact
and theory and serviceable hypothesis in the region of pure science.
But it is exactly in these respects that the record of the past half
century is so exceptionally brilliant. It is sometimes said that our
time is a day of small things—in science it has been a day of the
greatest things, for, within this time, falls the establishment, on a
safe basis, of the greatest of all the generalisations of science, the
doctrines of the Conservation of Energy and of Evolution.

As for work of less wide scope, I speak in the hearing of those
who can correct me if Iam wrong, when I say that the larger moiety
of our present knowledge of light, heat, electricity, and magnetism,
has been acquired within the time to which I refer; and that our
present chemistry has been in great part created, while the whole
science has been remodelled from foundation to roof. It may be
natural that progress should appear most striking to me among
those sciences to which my own attention has been directed, but I
do not think this will wholly account for the apparent advance “‘ by
leaps and bounds” of the biological sciences within my recollection.
The cell theory was the latest novelty when I began to work with
the microscope, and I have watched the building of the whole vast
fabric of histology; I can say almost as much of embryology, since
Von Baer’s great work was published in 1828. Our knowledge
of the morphology of the lower animals and plants, and a great deal
of that of the higher forms, has very largely been obtained in my
time; while physiology has been put upon a totally new foundation
and, as it were reconstructed, by the thorough application of the
experimental method to the study of the phenomena of life, and by
the accurate determination of the purely physical and chemical com-
ponents of these phenomena. The exact nature of the processes of
sexual and nonsexual reproduction has been brought to light. Our *
knowledge of geographical and geological distribution, and of the
extinct forms of life, has been increased a hundredfold. As for the
progress of geological science, what more need be said than that the
first volume of Lyell’s ‘‘ Principles ” bears the date of 1880 ?

This brief enumeration of the salient achievements of science in
the course of the last sixty years is sufficient not only to justify
what I have said respecting their absolute value, but to show how
much it excels, both in quantity and quality, the work produced
in any corresponding period since the revival of science. It suggests,

294 Anniversary Meeting. [Nov. 30,

as I have said, that science is advancing and will continue to advance
with accelerated velocity.

It seems to me, in fact, not only that this is so, but that there are
obvious reasons why it must be so. In the first place, the inter-
dependence of all the phenomena of nature is such that a seemingly
unimportant discovery in one field of investigation may react in the
most wonderful manner upon those which are most widely remote from
it. The investments of science bear compound interest. Who could have
imagined that a curious inquiry into the relations of electricity with
magnetism would lead to the construction of the most delicate instru-
ments for investigating the phenomena of heat; to means of measuring
not only the smallest intervals of time, but the greatest depths of the
ocean ; to methods of exploring some of the most hidden secrets of life P
What an enormous revolution would be made in biology, if physics
or chemistry could supply the physiologist with a means of making
out the molecular structure of living tissues comparable to that which
the spectroscope affords to the inquirer into the nature of the heavenly
bodies. At the present momeut the constituents of our own bodies
are more remote from our ken than those of Sirius, in this respect.
In the next place, the vast practical importance of the applications
of scientific knowledge has created a growing demand for technical
education based upon science. If this is to be effective, it means the
extension of scientific teaching to all classes of the community, and
the encouragement and assistance of those who are fit for the work of
scientific investigation to adopt that calling. Lastly, the attraction of
the purely intellectual aspects of science and the rapid growth of a
sense of the necessity of some knowledge of the phenomena of nature,
_and some discipline in scientific methods of inquiry, to every one who
aspires to take part in, or even to understand, the tendencies of
modern thought, have conferred a new status upon science in the
seats of learning, no less than in public estimation.

Once more reverting to reminiscence, the present state of scientific
education surely presents a marvellous and a most satisfactory con-
trast to the time, well within my memory, when no systematic
practical instruction in any branch of experimental or observational
“ science, except anatomy, was to be had in this country; and when
there was no such thing as a physical, chemical, biological, or geolo-
gical laboratory open to the students of any University,* or to the
pupils of any school, in the three kingdoms. Nor was there any
University which recognised science as a faculty, nor a school, public

* This statement has been challenged, so far as chemistry is concerned, on behalf
of the University of Edinburgh; but Sir Lyon Playfair informs me that, at the
time to which I refer, the practical instruction did not go beyond “ mere testing
exercises for medical students.” (T.H.H. Dec. 10, 1885.) :

1885. | President s Address. 295

or private, in which scientific instruction was represented by much
more than the occasional visit of a vagrant orrery.

At the present moment, any one who desires to obtain a thorough
scientific training has a choice among a dozen institutions; and
elementary scientific instruction is, so to speak, brought to the doors of
the poorer classes. If the rich are debarred from like advantages it is
their own affair; but even the most careful public school education
does not now wholly exclude the knowledge that there is such a thing
as science from the mind of a young English gentleman. If science
is not allowed a fair share of the children’s bread, it is at any rate
permitted to pick up the crumbs which fall from the time-table, and
that is a great deal more than I once hoped to see in my lifetime.

I have followed precedent in leading you to the point at which it
might be fair, as it certainly would be customary, to end by congratu-
lating you, as Fellows of the Royal Society, on the past progress and
the future prospects of the work which, for two centuries, it has been
the aim of the Society to forward. But it will perhaps be more
profitable to consider that which remains to be done for the advance-
ment of science, than to “ rest and be thankful” in the contemplation
of that which has been done.

In all human affairs the irony of fate plays a part, and in the midst
of our greatest satisfactions, “surgit amari aliquid.” I should have
been disposed to account for the particular drop of bitterness to which
I am about to refer, by the sexagenarian state of mind, were it not that
I find the same complaint in the mouths of the young and vigorous.
Of late years, it has struck me, with constantly increasing force, that
those who have toiled for the advancement of science are in a fair
way of being overwhelmed by the realisation of their wishes. We
are in the case of Tarpeia, who opened the gates of the Roman citadel
to the Sabines, and was crushed under the weight of the reward
bestowed upon her. It has become impossible for any man to keep
pace with the progress of the whole of any important branch of science.
If he were to attempt to do so his mental faculties would be crushed
by the multitude of journals aud of voluminous monographs which a
too fertile press casts upon him. This was not the case in my young
days. A diligent reader might then keep fairly informed of all that
was going on, without robbing himself of leisure for original work,
and without demoralising his faculties by the accumulation of unas-
similated information. It looks as if the scientific, like other revolu-
tions, meant to devour its own children; as if the growth of science
tended to overwhelm its votaries; as if the man of science of the
future were condemned to diminish into a narrower and narrower
specialist, as time goes on.

I am happy to say that I do not think any such catastrophe a

296 Anniversary Meeting. [Nov. 30,

necessary consequence of the growth of science; but I do think it is
a tendency to be feared, and an evil to be most carefully provided
against. ‘The man who works away at one corner of nature, shutting

his eyes to all the rest, diminishes his chances of seeing what is to

be seen in that corner; for, as I need hardly remind my present
hearers, that which the investigator perceives depends much more on
that which lies behind his sense organs than on the object in front of
them.

the degeneration of scientific workers, lies in the organisation and
extension of scientific education, in such a manner as to secure
breadth of culture without superficiality ; and, on the other hand,
depth and precision of knowledge, without narrowness.

I think itis quite possible to meet these requirements. ‘There is no
reason, in the nature of things, why the student who is destined for a
scientific career should not, in the first place, go through a course of
instruction such as would ensure him a real, that is to say, a practical
acquaintance with the elements of each of the great divisions of mathe-
matical and physical science ; nor why this instruction in what Gf Imay
borrow a phrase from medicine) I may call the institutes of science,
should not be followed up by more special instruction, covering the
whole field of that particular division in which the student eventually
proposes to become a specialist. I say not only that there is no
reason why this should not be done, but, on the ground of practi-
cal experience, I venture to add that there is no difficulty in doing
it. Some thirty years ago, my colleagues and I framed a scheme
of instruction on the lines just indicated, for the students of the
institution which has grown into what is now known as the Normal
School of Science and Royal School of Mines. We have found no
obstacles in the way of carrying the scheme into practice except
such as arise, partly, from the limitations of time forced upon us from
without; and, partly, from the extremely defective character of
ordinary education. With respect to the first difficulty, we ought, in
my judgment, to bestow at least four, or better, five, years on the
work which has, at present, to be got through in three. And, as
regards the second difficulty, we are hampered not only by the
ignorance of even the rudiments of physical science, on the part of
the students who come to us from ordinary schools, and by their very
poor mathematical acquirements, but by the miserable character ot
the so-called literary training which they have undergone.

Nothing would help the man of science of the future to rise to the
level of his great enterprise more effectually than certain modifica-
tions, on the one hand, of primary and secondary school education,
and, on the other, of the conditions which are attached by the
Universities to the attainment of their degrees and their rewards

It appears to me that the only defence against this tendency to

1885.1 | President's Address. 200

As I ventured to remark some years ago, we want a most favoured
nation clause inserted in our treaty with educators. We have a
right to claim that science shail be put upon the same footing as
any other great subject of instruction, that it shall have an equal
share in the schools, an equal share in the recognised qualification
for degrees, and in University honours and rewards. It must be
recognised that science, as intellectual discipline, is at least as
valuable, and, as knowledge, is at least as important, as literature,
and that the scientific student must no longer be handicapped by a
linguistic:(1 will not call it literary) burden, the equivalent of which
is not imposed upon his classical compeer.

Let me repeat that I say this, not as a depreciator of literature, but
in the interests of literature. The reason why our young people are
so often scandalously and lamentably deficient in literary knowledge,
and still more in the feeling and the desire for literary excellence,
lies in the fact that they have been withheld from a true literary
training by the pretence of it, which too often passes under the name
of classical instruction. Nothing is of more importance to the man
of science than that he should appreciate the value of style, and the
literary work of the school would be of infinite value to him if it taught
him this one thing. But Ido not believe that this is to be done by
what is called forming oneself on classical models, or that the advice
to give one’s days and nights to the shoal oe any great writer, is of
much value. ‘“ Le style est homme meme,” as a man of science who
was a master of style has profoundly said; and aping somebody else
does not help one to express oneself. A good style is the vivid
expression of clear thinking, and it can be attained only by those who
will take infinite pains, in the first place, to purge their own minds of
ignorance and half knowledge, and, in the second, to clothe their
thoughts in the words which will most fitly convey them to the minds
of others. I can conceive no greater help to our scientific students
than that they should bring to their work the habit of mind which is
implied in the power to write their own language in a good style.
But this is exactly what our present so-called literary education so
often fails to confer, even on those who have enjoyed its fullest
advantages ; while the ordinary schoolboy has rarely been even made
aware that its attainment is a thing to be desired.

I venture to lay these last observations before you, because we have
heard a good deal lately of schemes for the remodelling of the Univer-
sity of London, which has done so much, through its Faculties of
’ Science and Medicine, to promote scientific instruction. Asa member
of the Senate of the University I am necessarily greatly interested
in such projects, and I greatly regret that I have been unable to
take part in the recent action concerning them. ‘This is not the
time or the place for the discussion of any of these proposals, but many

‘ ears
ite
Bass ani 3.4 P=

298 Anniversary Meeting. | Nov. 30,

of my hearers must be as warmly interested in them as I am myself
and it may not be out of place to submit two questions for their
serious consideration.

In the interests of science, will any change be satisfactory which
does not lighten the linguistic burden at present imposed on students
of science and of medicine by the matriculation examination P

And again, in the interests of science, will any change be satis-
factory which does not convert the examining university into a teaching
university ? And, by that last term, I do not mean a mere co-operative
society of teacher-examiners, but a corporation which shall embrace
a professoriate charged with the exposition and the advancement of
the-higher forms of knowledge in all its branches.

The future both of pure science and of medicine in this country
is, I think, greatly interested in the answer which Fellows of this
Society, after due meditation, may be disposed to give to these
questions.

I have to announce an unusually large number of changes in the
staff of the Society.

Last December we regretted to receive the resignation of Mr. Walter
White, so long our Assistant Secretary, whose faithful and efficient
services, continued for more than forty years, are well known to all
the Fellows of the Society. The minutes of the Council record our
appreciation of Mr. White’s services, and our endeayour to give as
substantial a form as possible to our hearty recognition of his deserts.
The vacancy thus caused has been filled up by the appointment of
Mr. Herbert Rix, whose work since he has held the office of clerk
has been such as to justify the confidence of the officers, not only that
the functions hitherto discharged by the Assistant Secretary will be as
well performed as heretofore ; but that, if the interests of the Society
should demand it, we may throw still more important duties upon him.
I receive the most favourable reports of the efficiency of Mr. James
who has been appointed to the office of clerk in place of Mr. Rix.

Notwithstanding my release from all serious work, my health
remained so very indifferent for some months after my return to
England, that I felt it my duty to the Society to bring the question of
my resignation of the Presidency, on the present Anniversary, before
the Council which met on the 20th of May. My colleagues were kind
enough to wish that my final decision should be deferred, and J need
hardly say how willing I should have been to retain my honourable
office, if I could have done so with due regard to the interests of
the Society, and perhaps I may add, of self-preservation.

lam happy to say that I have good reason to believe that, with
prolonged rest—by which I do not mean idleness, but release from
distraction and complete freedom from those lethal agencies which

1885.] | President's Address. 299

are commonly known as the pleasures of society—I may yet regain
so much strength as is compatible with advancing years. But in order
to do so, I must, for a long time yet, be content to lead a more or less
anchoritic life. Now it is not fitting that your President should
be a hermit, and it becomes me, who have received so much kindness
and consideration from the Society, to be particularly careful that no
sense of personal gratification should delude me into holding the
office of its representative one moment after reason and conscience
have pointed out my incapacity to discharge the serious duties which
devolve upon the President, with some approach to efficiency.

I beg leave, therefore, with much gratitude for the crowning honour
of my life which you have conferred upon me, to be permitted to
vacate the chair of the Society as soon as the business of this meeting
is at an end.

As I am of opinion that it is very undesirable that the President
should even seem to wish to exert any influence, direct or indirect, on
the action of the Fellows assembled in General Meeting, I am silent
respecting the proposals embodied in the new list of the officers of
the Society which my colleagues and I have unanimously agreed to
submit for your consideration.

The President then proceeded to the presentation of the Medals :—

The Copley Medal is awarded to Professor August Kekulé of
Bonn, whose researches in organic chemistry, extended over the last
five-and-thirty years, have been fruitful of results of high importance
in chemical science. The great work of Professor Kekulé’s life,
that which has raised him to the highest rank among the inves-
tigators of the day, is his general theory of the constitution of
carbon compounds, in which the now universally accepted conception
of the constitution of those compounds was first clearly and definitely
stated.

A development of the fundamental theory led Kekulé to the dis-
covery of the constitution of an exceedingly numerous and very com-
plex class of compounds, which he has named the aromatic compounds,
and his theory of the constitution of the aromatic compounds has
suggested and guided innumerable investigations. The marvellous
success obtained by many of his followers and pupils in building up
artificially complex substances which had defied the efforts of all pre-
vious investigators, affords tangible evidence that Kekulé’s labours
have given us a deeper insight into the order of nature.

One of the Royal Medals is awarded to Professor Hughes, F.R.S.,
for a series of experimental investigations in electricity and magnetism,
which are remarkable alike for ingenuity of contrivance, for the
simplicity of the apparatus employed, for the delicacy of the indica-
tions afforded, and for the wide applicability of the instruments

300 Anniversary Meeting. [Nov. 30,

invented to researches other than those for which they were originally
designed.

The microphone, the induction balance, and the sonometer, are
instruments by which inconceivably minute electrical. and magnetic
disturbances not only make themselves loudly audible, but may be
definitely measured; and their application has opened up new lines
of inquiry.

The other Royal Medal is awarded to Professor H. Ray Lankester,
F.R.S8., for his labours, now extending over more than twenty years,
in the field of animal morphology (especially invertebrate anatomy
and embryology) and of paleontology.

Professor Lankester has been active in many directions, and has
everywhere left his mark, not only as an energetic teacher and accurate
worker and a philosophical thinker; but as one who, in times when
the example is more than ever valuable, has always been careful to
remember that speculation should be the servant and not the
master of the biologist.

The Davy Medal is awarded to Professor Stas of Brussels.

Professor Stas’ great research, for which it is proposed that
the Davy Medal be awarded to him, is that on atomic weights.
There are probably no researches in chemistry, the results of
which appeal so little to the imagination, and which are so little
applauded as those on atomic weights, yet for difficulty and import-
ance they are hardly surpassed by any. The determination of these
fundamental constants of chemistry has engaged the attention of
many of the leading chemists, and, before the time of M. Stas’
experiments, an immense amount of careful labour had been bestowed
on finding methods for the more accurate and complete purification
of the compounds employed for the purpose.

The indefatigable and conscientious care which M. Stas has
devoted to the re-determination of a certain number of the most
important atomic weights, and the marvellous skill with which he has
overcome the various difficulties which successively presented them-
selves, render his memoir on the subject one of the most remarkable
and valuable of chemical monographs.

I regret to say that the state of M. Stas’ health has not permitted
him to be with us to-day, but the representative of his Sovereign, the
King of the Belgians, in this country, has kindly consented to receive
the medal for him. |

M. le Baron Solvyns, I request your Excellency to be so good as
to receive the medal awarded to M. Stas; and to assure him of the
pleasure which it gives the Royal Society to show their sense of his
high merits, by asking his acceptance of this memorial of his illustrious
predecessor, Humphry Davy.

-1885.] | Anniversary Meeting. 30]

The Statutes relating to the election of Council and Officers were
then read, and Dr. Gilbert and Mr. Kempe having been, with the
consent of the Society, nominated Scrutators, the votes of the Fellows
present were taken, and the following were declared duly elected as
Council and Officers for the ensuing year :— |

President.—Professor George Gabriel Stokes, M.A., D.C.L., LL.D.
Treasurer.—John Evans, D.C.L., LL.D,

Professor Michael Foster, M.A., M.D.

is | The Lord Rayleigh, M.A., D.C.L.

Foreign Secretary.—Professor Alexander William Williamson, LL.D.

Other Members of the Council.

Professor Robert B. Clifton, M.A.; Professor James Dewar, M.A. ;
Professor William Henry Flower, LL.D.; Archibald Geikie, LL.D. ;
Sir Joseph D. Hooker, K.C.S.I.; Professor Thomas Henry Huxley,
LL.D.; Admiral Sir A. Cooper Key, G.C.B.; J. Norman Lockyer,
F.R.A.S.; Professor Henry N. Moseley, M.A.; Professor Bartholomew
Price, M.A.; Professor Pritchard, F.R.A.S.; William James Russell,
Ph.D.; Professor J.S. Burdon Sanderson, LL.D.; Professor Arthur
Schuster, Ph.D.; Lieutenant-General R. Strachey, R.E., C.S.1.;
General James Thomas Walker, C.B.

The thanks of the Society were given to the Scrutators.

The following Table shows the progress and present state of the
Society with respect to the number of Fellows :—

‘Patron : Cone £4 £3

oval oS pounders.! yearly. | yearly. | 7°
Dec. 1, 1884 ee +) 46 202 189 Td. 319
Since Elected ..| | + 2 + 8; + 1/)]+ 12/ + 18
Since Re-admitted ve al
Since Deceased .. ~- 3 =O) eee Ol eae Ome aa OS
INOW, oO, SSo: . 5) 450 196 182 87 515

Financial Statement.

302

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[Nov. 30.

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304

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1885.]

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[Nov. 30,

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=
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3

310 Appropriation of the Government Grant. [N ov. 30,

Account of the appropriation of the sum of £4,000 (the Govern-
ment Grant) annually voted by Parliament to the Royal
Society, to be employed in aiding the advancement of

Science (continued from Vol. XX XVII, p. 457).
1884-85.

Dr. D. Gill, for reducing and discussing several series of
observations of the minor planets Victoria and Sappho, for the
purpose of determining the Solar parallax....:............--

Council of the Royal Astronomical Society (per H. B.
Knobel), for comparison of Greenwich Lunar Observations,
1847-61, with Hansen’s “‘ Tables de la Lune” ..............

Dr. D. Gill, for assistance and chemicals to obtain (1) a
Series of daily photographs of the Solar Corona; (2) Photo-
graphic Star-maps of the Southern Heavens................

Prof. J. A. Ewing, towards the construction and establishment
of Seismometers at the Observatory on Ben Nevis ..........

Prof. W. N. Hartley, for Materials, Apparatus, and Aegina
ance for continuing his investigations in (1) Spectrum Photo-
graphy, in relation to New Methods of Quantitative Chemical
Analysis; (2) On the relation between the Absorption Spectra
and the Molecular Constitution of Organic Compounds ......

H. B. Guppy, for the exploration of the Interior of the
Islands of Guadalcanar and St. Christoval (Solomon’s

W. H. Caldwell, for panes aid in studying the development
of Ceratodus, Monotremata, and Marsupials in Australa ....
Dr. S. J. Hickson, towards the expense of a voyage to the
Malay Archipelago with a view to certain Anatomical and
Hmbryological Researches: a. <2... - -eiee a 2 ee
Dr. H. Hicks, for the expense of Exploring two Bone
Caverns, situated in the Carboniferous Limestone on the east
side of the Vale of Glwyd, North Wales °.........-Sacepe
J. S. Gardner, for continuing Investigations into the
Tertiary Inter-basaltic Floras of Ireland, Scotland, and Ice-
Bits ee ate AAA kt GOS yey a Soo lft
F. R. Japp, for a study of the Reactions of Quinones, Di-
ketones, and allied compounds... :\.\.5-. & --.s-2-. een
Henry Robinson, for continuation of Researches on the
ae Weights of the Metals of the Cerium and Yttrium

320

300

200

100

150

200

200

50

50

£1,820

1885. | Appropriation of the Government Grant. 311

Broueht forward. 5. .4../.6 ee 6 3 £1,820
N. Collie, for completing a Research on the Salts of Tetrethyl
5] STL CULT ea a 20
H. Tomlinson, for continuation of his Researches on the In-
fluence of Stress and Strain on the Physical Properties of

RO te RE I PNG le aecteas Sect incase avsict all 6 SIR Ma « Ware eicie Cleo 50
H. R. Mill, for a Research on the Chemistry of Estuary
OE ESE cc 8 Sgt cg RMR Ree rt em ein gee ie sae ee ae 200

Wilson L. Fox (R. Cornwall Polytechnic Society), for the
purchase of a Dip Circle and a Unifilar (£80), and furnishing
the Unifilar with an Altazimuth (£20) for the Falmouth Ob-
SED TEURCIOE SSIs 7s Ren eae, ena as eee ae ee 100
Prof. P. G. Tait and A. Buchan, for an Investigation into
the best form of Apparatus for the observation of the actual
Temperature of the Air apart from the effects of the Sun’s
Rays, and other circumstances, on the Thermometers used.... . 50
Dr. Gore, for expense (including assistance) of an Experi-
mental Investigation of the subject of “ Transfer-resistance ”

smeblecHolmiac and Voltaic, Cells ..:: calc .0late \cre-cailniste cielaialerace 150
J. Kerr, for continuation of Optical and Electro-optical

REESE AICS, 45... o. sncn sors Bh pace yenedcn bcd hea shad ixep taevenevanenshsuen ss IES EO
R. Milne Murray, for continuation of his Research on the

Reema pUOM AOL IE. WLOTUGs, », ois. 2.5 opnascereiaforsic 5 a's ie & aw wie eS ha 50
Rev. A. E. Eaton, to defray the cost of Illustrations of a

Revisional Monograph of Terrestrial Isopod Crustacea ...... 100
Dr. L. C. Wooldridge, for the expense of Researches on the

Enysialesy and Patholeogy+ot the Blood 3)... .0./2.5 sce oe. oe eo EO
H. T. Stainton, in aid of the Publication Fund of the

Zoological Record Association..... SUNT ORES Beney ed Renter ays 150
Victor Horsley, for a Research on the Functions of the

ss LVIASEG, LEOCAY? RIG an aa erm Cn ara aU i PR etree 50

J.J. Harris Teale, for aid in the Collection of Specimens
and Preparation of Sections to illustrate a work on Petro-

Sperapiny eee te on cjreePern «Eis 6104 5 Sh Ae Gia Safehers avteieree weeny oe 60
K. A. Schafer, for additional assistance in Researches into

ube Ehysiology or the Nervous System .2.. 0.32.0... 22s eee 50
R. Kidston, for Investigations in the Distribution of the

Pe ALOOMICLOUS OSI EAATIUS: 4 2:2 slele a 0 = ca 9S 2.5 ciccieters Hae wee be 40

G. C. Bourne, towards the expense of-an Hxpedition to the.
Chagos Islands, with a view to study their Faunaand Flora.. 100

J. T. Cunningham, for continuation of a Research on the
Development of Marine Teleostean Fishes, and of Myzine
WUT TERS COC BOGE RENNIE PE CRO CII a me aioe oy Oe

Carried: forwards oes seve 4< «<4 £3,090

312 Appropriation of the Government Grant. [Nov. 30,

Brought forward.......ccsse Be 34 05/0)
Spencer U. Pickering, for an Investigation on Molecular
Compounds... ...%'. see dee 25 see ae so see eee ee 100
O. Masson and L. Dobbin, for a Research on the Action of
the Halogens on the Salts of Organic Bases ........../..... 25
W. R. Dunstan, for an Investigation of the Chemical and
Physiological Properties of the Glucoside (Loganin) which
exists in. Strychnos, Nux Vomica........+....~.542 - ose 15
C. ¥. Cross, E. J. Bevan, and C. S. 8. Webster, for aid in
re-investigating the substance Phenose and the Chemistry of
Taquefactiom, 2.0.50 ce ne BL celscle wie ole Ge ble 125
Percy F. Frankland, for an Assistant in a Research on the
Action of various Chemical and Mechanical Agencies upon
the Vitality and Distribution of Micro-organisms in Air and
Water © Sede cals Big Gaik ote ellis diate ote die 6 ee 5 Mane 50
W. EH. Adeney, for determining the Wave-lengths and
mapping the lines of the Ultra-violet Spark Spectra of
Chromium and Manganese, and those lines of iron more re-
frangible, than wave-length 2146.7. ...0../...... 2.20 eee 50
T. Rupert Jones, for continuing Hxamination of the Fossil
Ostracoda: .cen cecum mcs wtebee Mehe te ee eer eeeee +> eee 100
Prof. W. K. Parker, for continuation of Researches on the
Morphology of the Vertebrata ......... ons-dip Siete wie se 300
Walter Gardiner, for Investigations on the various Pheno-
mena in connexion with Insectivorous Plants .............. 100
H. B. Baker, for Investigating whether the Presence of a
third body is necessary for the Combustion of Hlementary
Bodiésanm Oxygen 0 62 anes 6 ot ae ote bee eee ee 100
£4,055
Dr. Cr.
oe is. Mad. ceri
To Grant from Treasury ....... 4,000 0 0} By Balance, Dec. 1,
To Repayments —..\.-\...2--% ss. <200 0 0 1884) ........venis | Soe elma
To Interest on Deposit......... 17 2 5 | By Appropriations, as
To Balance on hand, Nov. 30, above... ...2.ss- «« Se@naneaeueee
WSO oie le velatede apne bse wats alsin 301 12 5 | Printing, Postage, Ad-
vertising, and other
s Administrative Ex-

PENSES oe. cadece a © VeueomeeE

£4,468 14 10 £4,868 14 10

1885. } Account of Grants from the Donation Fund. 313

Account of Grants from the Donation Fund in 1884-85.

25 use
Prof J. J. Thomson, for Apparatus to make quanti-
tative experiments in the decomposition of steam under
various pressures by the silent electrical discharge ...... Zon 0
Dr. Gaskell and Mr. Gadow, to further assist them in
their anatomical and physiological Researches on Rep-
Sale clo.) anna So) os sa claih s <it\e 0.4, o,a'eie apne == 5,0 SOO 70)
Dr. Brunton, for continuation of his Researches on the
connexion between Chemical Constitution and Physio-
epee RT FP RU ao a og vies dag oe BA 50 0 0
i Committee of the Royal Society, for Sietlies aid in
photographing the Corona of the Sun and carrying out

other physical observations at high elevation............ 36 14 2
Prof. Lankester, in aid of an investigation into the Fresh-

iecteeen ee OF eT on) a is dine ogee ee she wee ea ss JOE)
Mr. Harvey Gibson, for aid in the prosecution of his

Researches into the Embryology of Patella vulgata...... Za Os, 56
The Marine Biological Association, for the erection of

marine laboratories on the coast of Great Britain........ 250 0,0

Prof. Schafer, for further aid in his Researches into the

Physiology of the Heart, and the Electrical Condition of

paeeeks SEMPER CE EAMIG SS cos oo ahtiniotnreGiershald ase dm ae sea ele® caer 200 -OEn6
Dr. Sclater, to secure the services of Mr. W. H. Hudson

in revising and preparing for publication a work on the

inrds ot the Arcentine Republic’. ..... 2-00. cee cs ees ve 40 0 0
The Krakatoa Committee, for further Expenses in

collecting and classifying notices of the Volcanic Out-

PMEsEI at ge. Gerais OF Sunda ¢ . 6c. '< slew He ds «Oe Slee holes 510 0 0
Prof. Roy, for aid in investigating in Spain the nature

BRO HOLETS ) 505 ss outa sls Beha Nee eS eer See LOO" 6
Prof. Judd, for aid in making excavations at Cutties’

Bialik: Carry, Bear WIG, 5). ci. + 21s cies) stele n'y bo 2c = wie s ior 0. 0

£733 14 2

Report of the Kew Committee for the Year ending
: October 31, 1885.

The operations of The Kew Observatory, in the Old Deer Park,
Richmond, Surrey, are controlled by the Kew Committee, which is
constituted as follows:

Mr. Warren de la Rue, Chairman.

Captain W. de W. Abney, Vice-Adm. Sir G. H. Richards,

R.E. C.B.
Prof. W. G. Adams. The Earl of Rosse.
Capt. Sir F. Evans, K.C.B, Mr. R. H. Scott.
Prof. G. C. Foster. Lieut.-General W. J. Smythe.
Mr. F. Galton. Lieut.-Gen. R. Strachey, C.S.I.
Mr. HE. Walker.

The work at the Observatory may be considered under the fol-
lowing heads :—

Ist. Magnetic observations.

2nd. Meteorological observations.

ord. Solar observations.

4th. Experimental, in connexion with any of tbe above depart-

ments.

Sth. Verification of instruments.

6th. Rating of Watches.

7th. Miscellaneous.

I. MaGnetic OBSERVATIONS.

The Magnetographs have been in constant operation during the
year, and in accordance with the usual practice, determinations of
the scale values of all the instruments were made early in January.

As regards magnetic disturbances, no very exceptional variations
have been registered. The principal perturbations occurred on the
following dates :—November 2-3, 1884; March 15-16, May l3and 27,
and June 20-26, 1885.

In February the Kew 9-inch Unifilar Magnretometer by Jones was

Report of the Kew Committee. 315

sent to Messrs. Elliott Brothers, London, for the purpose of having
Mr. Whipple’s arrangement for steadying the Collimator Magnet
fitted, and at the same time a rack and pinion adjustment was
attached to the small telescope employed in viewing the collimator
scale, in order to bring the scale more readily into focus.

The values of the ordinates of the different photographic curves
determined in January were as follows :—

Declination: 1 inch=0° 22°04. 1cm.=0° 8”7.

Bifilar, January 13, 1885, for 1 inch 6H=0°0268 foot grain unit.

em... —0-0005 CGS. unit:
Balance, January 14,1885 ,, 1 inch 6V=0-0280 foot grain unit.
ot cm. ,. —O070005 G:G.S. unit.

Information on matters relating to terrestrial magnetism and
various data have been supplied to Dr. Wild, Professor Mascart,
Dr. Van der Stok, Mr. R. H. Scott, Professor W.G. Adams, Dr. aN
vorsel, Professor Riicker, and Dr. Atkinson.

The monthly observations with the absolute instruments nalts been
made as usual, and the results are given in the tables forming
Appendix I of this Report.

The following is a summary of the number of magnetic observations
made during the year :-—

Determinations of Horizontal Intensity........ o4
af hniglima tions 2ja. odors sp2e% = os 127
Absolute Declination........ ts,

33

International Polar Commission.—The magnetic observations made
during the year September, 1882, to August, 1883, at Fort Rae, North
America, by the expedition under Captain Dawson, R.A., have been
fully reduced and prepared for publication, on the plan adopted by
the International Polar Commission at their Meeting at Vienna in
1884, by the Observatory staff during extra office hours, and the
work is at present passing through the press. ‘The readings of the
Kew Magnetographs have also been reduced on the same plan at the
cost of the Polar Committee of the Royal Society, and copies
forwarded to Dr. H. Wild, President of the Commission. Special
scales were constructed for the tabulation of the Kew curves on the
C.G.S. system by Mr. Baker, the magnetic observer.

Krakatoa Hruption—The Krakatoa Committee of the Royal
Society having entrusted to the Kew Committee the data which
they have collected relating to electrical and magnetical phenomena
which occurred about August 27, 1883, the date of the eruption of
Krakatoa, the curves of the magnetographs of the Observatories at

316 _ Report of the Kew Committee.

Batavia, Colaba, Lisbon, Mauritius, Melbourne, Paris, Stonyhurst,
and Zi-ka-wei have been carefully compared with each other, and a
report thereon will shortly be submitted to the Committee.

Il. MeteoroLoGgicaAL OBSERVATIONS.

The several self-recording instruments for the continuous registra-
tion respectively of atmospheric pressure, temperature, and humidity,
wind (direction and velocity), bright sunshine, and rain, have been
maintained in regular operation throughout the year.

In February the barometer tube was removed for a short time
from the barograph, and a carefully divided glass scale substituted in
its place, which was then photographed with the view of re-deter-
mining the scale value of the instrument, and also of measuring the
amount of distortion the curve undergoes by shrinkage of the
gelatinized paper during the photographic operations, to which it
is subjected, subsequent to its reception of the luminous image.

In September the action of the barograph was observed to be some-
what sluggish, and an examination of the instrument showed an
obstruction of the air-vent in the cistern due to an accumulation of
dust. This was removed, and there has since been no want of
sensitiveness on the part of the barometer.

The standard eye observations for the control of the automatic
records have been duly registered during the year, together with the
daily observations in connexion with the U.S. Signal Service
synchronous system. A summary of these observations is given in
Appendix IT.

The tabulation of the meteorological traces has been regularly
carried on, and copies of these, as well as of the eye observations,
with notes of weather, cloud, and sunshine have been transmitted
as usual to the Meteorological Office.

The following is a summary of the number of meteorological obser-
vations made during the past year :—

Readings of standard barometer .............. 1750
Hh dry and wet thermometers........ 3460

- maximum and minimum thermo-
AUCLELS. \..ch utc Pome ehGe a ee 730
os radiation thermometers .......... 2825
ss HAIN Sans) poems ele. ciate eee 730
Cloud and weather observations .............. 1825
Measurements of barograph curves............ 8760
iA dry bulb thermograph curves.. 9490
-. wet bulb thermograph curves. . 8760
ia wind (direction and velocity)... 17520
= raiutall curves? . ene asi sneer 680

He sunshine traces.. des eere eee 2079

Report of the Kew Committee. 317

In compliance with a request made by the Meteorological Council
to the Committee, Mr. Whipple visited Falmouth in May in order to
superintend the removal of the meteorological instruments from the
old Observatory to the new building recently erected near that town
by the Royal Cornwall Polytechnic Society ; he has since inspected
the instruments at the Aberdeen, Stonyhurst, and Glasgow Observa-
tories, and the Anemographs at Yarmouth and Sandwick.

Mr. Baker visited the Valencia and Falmouth Observatories for the
purpose of inspection during his vacation.

With the sanction of the Meteorological Council, weekly abstracts
of the meteorological results have been regularly forwarded to, and
published by ‘‘The Times” and “The Torquay Directory.” Data
have also been supplied to the Council of the Royal Meteorological
Society, the editor of ‘“‘Symons’s Monthly Meteorological Magazine,”
the Secretary of the Institute of Mining Engineers, Messrs. Gwilliam,
Rowland, and others. The cost of these abstracts is borne by the
recipients.

Hlectrograph.—The difficulty of maintaining the potential of the
charge of this instrument constant, mentioned in last year’s Report,
having greatly increased, in spite of all measures of precaution which
were taken, the Meteorological Council were in July informed of its
unsatisfactory condition. They accordingly gave instructions to
discontinue its working, and it is intended to draw up a report on
the results which may be obtained from the eleven years’ curves of
variations of atmospheric electricity now available for discussion.

III. Sonar OBSERVATIONS.

The sketches of Sun-spots, as seen projected on the photoheliograph
screen, have been made on 170 days, in order to continue Schwabe’s
enumeration, the results being given in Appendix II, Table IV.

Transit Observations.—3820 observations of solar and 102 of sidereal
transits have been taken, for the purpose of keeping correct local time
at the Observatory, and the clocks and chronometers have also been
compared daily. The Observatory Chronometer, Breguet 3140, has
been cleaned and readjusted.

The following clocks, French, Shelton K. O., and Dent 2011, and
the chronometers, Molyneux No. 2125, and Breguet No. 3140, are
kept carefully rated as time-keepers at the Observatory.

TV. ExprerRimentaL Work.

Photo-nephograph.—The experiments with the photo-nephographs
having proved satisfactory, and a report to that effect having been
presented to the Meteorological Council, it was decided in June to

318 Report of the Kew Committee.

take frequent pictures for the purpose of determining the rate of
motion of clouds. Accordingly the telegraph cable uniting the two
stations was buried in the ground (permission having previously been
granted by the lessee of the Old Deer Park), and the stands and
electrical fittings were made fixtures.

A quantity of photographic plates, prepared in accordance with
Captain Abney’s formula, were also obtained from a manufacturer,
and certain arrangements made in the photographic laboratory of the
Observatory for their convenient manipulation. Blank forms for
the computation of the cloud positions and motions were also drawn
up and printed.

Between July 6th, when the installation of the apparatus was com-
pleted, and the date, when the experiments were brought to a close,
in accordance with the instructions of the Meteorological Council,
168 cloud negatives were obtained on 23 days, from these 62 approxi-
mate determinations of the rate and direction of motion of clouds
at heights varying from 3,000 feet to 50,000 feet have been secured.

A detailed report of the work is being drawn up for presentation
to the Meteorological Council.

Solar Radiation Thermometers.—The Committee have made a
great number of experiments on the construction and exhaustion of
the solar radiation thermometers, and the Superintendent is engaged
on a report to be communicated to the Royal Society. The general
result would indicate that solar radiation as measured by the black
bulb thermometer in vacuo has hitherto been considerably under-
rated.

Baily’s Wind Integrator.—This instrument, after working success-
fully with electrical counters for some time, was simplified by the
inventor by the substitution of mechanical counters. These being
found to work satisfactorily, Mr. Baily removed the instrument in
May for the purpose of exhibiting it at the International Inventions
Exhibition.

The spare Beckley Anemograph to which it was attached has been
dismounted, and together with the de la Rue recorder (see report for
1879) has, by direction of the Meteorological Council, been forwarded
to Mr. Munro to be reconstructed as a Beckley recorder of the
original type.

Hlectrical Anemograph.—The Meteorological Council having granted
a sum of money for experiment, and placed at the disposal of
Mr. W. Preece, F.R.S., Superintendent of Telegraphs, an old
Beckley Anemograph of the 1858 model, that gentleman had it
fitted up by Mr. Kempe, of the Chief Hngineer’s Department,
G.P.O., so as to record electrically, and it was erected on the Experi-
mental House of the Observatory. The velocity attachment has
woiked most satisfactorily for the past six months, neither batteries

Report of the Kew Committee. 319

nor connexions having needed the slightest attention. The direction
gear has, however, occasionally required readjustment of its orienta-
tion after strong winds have blown, and is now undergoing alteration.

Hand Anemometers.—A number of these instruments, intended to
show the velocity of the wind during a brief period of observation,
have had their scale values determined by direct comparison with the
Standard Anemograph of the Observatory.

Range-finders.—Facilities have been afforded to Dr. Ristori,
F.R.A.S., by the employment of the Cocke apparatus, for the purpose
of graduating some new range-finders invented by Mr. Nordenfeldt,
and constructed by Mr. Casella, the cost of the experiments being
defrayed by the inventor.

V. VERIFICATION OF INSTRUMENTS.

The following magnetic instruments have been verified, and their
constants determined :—

2 Unifilar Magnetometers and an Inclinometer for Elliott
Brothers, London.

1 Unifilar Magnetometer with two Collimating Magnets, and
an Inclinometer for the Admiralty, London.

1 small-pattern Fox Circle for the Bureau of Navigation,
United States Government, and an ordinary Inclinometer
for Dover, Charlton.

3 pairs of Inclinometer Needles have been purchased on commiss:on
and verified for Dr. Wild and the Mauritius Observatory.

One Unifilar and an Inclinometer are at present undergoing
examination for the Falmouth Observatory.

The total number of other instruments tested in the past year was
as follows :—

arannerersynsovamiG vrCe ies erse esi, o's 450 5) 4 5 <8 Soe 54
3 Marine and Statiom so... ks <6 <i 98
PABA THOM GIS aes yee tay cg sone ty Sto) oe sriecanel siete Scale. Siyeile we) wile 104,
Ai Dron iH ales ie aa teuct csc 256

Thermometers, ordinary Meteorological ..... 1825
ee RSenEMGl ene ke ue hnte cee cane taleet eye 143

a VO MAG ALT, 2s sess doe enclens ane 13

Ay Oiimical esos wea cae wees 8238

$3 Solariradiaiiom fo cn0. 6 ae ss. 49

Motel esc sa 10268

VOL. XX*XIX. Y

LW ys ie as G he oa
v « « » 4 re
? é J ‘ ve 2

320 Report of the Kew Committee.
Ey drometers oo. seein 2 oe tee eee oe eee 461
Anemometers. ....25...4: ye AT Se er 14
Rain Gauges). to Dee ae 20
Nexbantbs. 60s She se ee Gee ae 130
Index and Horizon Glasses, unmounted......... 74:
Dark Glasses, unmounted” 222) ./2.). 5 oe eee 235

Besides these, 38 Deep-sea Thermometers have been tested, 32 cf
which were subjected, in the hydraulic press, without injury, to
pressures exceeding two tons on the square inch. 55 Thermometers
have been compared at the freezing-point of mercury, making a total
of 10,361 for the year.

Duplecate copies of corrections have been supplied in 43 cases.

The number of instruments rejected on account of excessive
error, or which from other causes did not record with sufficient
accuracy, was as follows :—

Thermometers, clinical’. 5. 2- sc. ee nate eee 52
a ordinary meteorological ........2. 4
VARIOUS esis auouelace a seta Rouble evo ce shee ee 97

3 Standard Thermometers have also been calibrated, and supplied
to societies and individuals during the year.

1 Evaporation Gauge, 4 Thermograph Thermometers, 1 Sunshine
Recorder, 2 Gauge Barometers for comparing Aneroids, 1 Electrical
Anemometer, and 1 Richard Thermograph were also tested.

There are at present in the Observatory undergoing verification,
2 Barometers, 222 Thermometers, 100 Hydrometers, 24 Sextants, and
1 self-recording Aneroid.

Seatant Testing Apparatus——In consequence of the increasing
number of sextants sent to the Observatory for examination it was
found desirable to provide a special accommodation in the building
for the work. As the room known as the Pendulum room was
unoccupied, and the masonry pier fitted up in it as a support for
pendulum apparatus was no longer required, it was resolved to
convert the apartment into a sextant room, and accordingly the pier
was removed, and the Cooke testing apparatus dismounted from the
South Hall and re-erected on its site. Four careful redeterminations
were then made of the angles between the collimators, and they
were found to have been unaffected by the transfer of the apparatus
to the new position.

VI. Rating or WATCHES.

The arrangements for rating watches mentioned in previous
Reports have been continued during the year with great success, and

:

Report of the Kew Committee. ey

up to the present 367 watches have been tried, of which 39 were
submitted by the owners, and 328 by the manufacturers or dealers.

The 302 watches received during the year were entered for testing
in the following classes :—

For class A, 254; class B, 38; and class C, 10. Of these 72 failed
to gain any certificate; 6 passed in C, 60 in B, 110 in A, and 6
others obtained the highest possible form of certificate, the class A
especially good.

Owing to numerous requests from manufacturers and others, a
system of awarding marks to class A watches, indicating the degree
of relative efficiency exhibited during trial, was adopted, being based
upon plans already in use in the Geneva and Yale Observatories.
In it the number of marks awarded to a watch that only just succeeds
in obtaining an A certificate is 0, but to an absolutely perfect watch
would be 100, made up as follows:—40 for a complete absence of
variation of daily rate, 40 for absolute freedom from change of rate
with change of position, and 20 for perfect compensation for effects
of alteration of temperature.

As, however, the trials already in use do not comprise a test for the
going of travellers’ or explorers’ watches, experiments are in progress
with a view of constructing apparatus to test the behaviour of watches
when kept in motion, as in the case of daily wear and travelling, in
order to make a special examination on this point for watches sub-
mitted for trial by the Royal Geographical Society.

A series of tests for pocket chronographs has also been introduced
by special request of the Cyclists’ Union.

In Appendix III will be found a table giving the results of trial of
the watches which have gained the highest certificates in each class.

The following table will indicate the nature of the trials to which
ordinary certificates refer :—

For certificate of Class
Position of watch during test.

A. B. C.
Vertical, with pendant up.......... 10 days 14 days 8 days

3s + pata tien oe ortee Peal ps — a=

3 is Pea POLL Gicokeret sions dose Oy x — —
Horizontal, with dial up .........6+. Se 59 14 days 8 days

2 Me Pe OWN skuleete, i082 OMe — —

ce Ah Lemp Sos Hie \s\e10)< vies Se 1 day oo

9 9 35: E. eeoceeoees 5 ” i! ” eats

MGV, VALCO cian st cade at etre avelelw, s.sce 4.00 4 wile Bets Baas —
Total duration of test.........es00 45 days 31 days 16 days

¥ 2

322 Report of the Kew Committee.

VII. MiscELLANEous.

Photographic Paper, §c.—This has been supplied to the Okserva-
tories at Alipore, Colaba, Falmouth, Glasgow, Mauritius, Stony-
hurst, St. Petersburg, and Toronto, and to the Meteorological Office.

History of the Observatory.*—A. paper giving a history of the Kew
Observatory from its earliest foundation down to the present date has
been compiled by Mr. R. H. Scott, a member of the Committee, and
printed in the “ Proc. Roy. Soc.,” vol. xxxix, p. 37.

Dowson Gift—The Committee are indebted to Mr. EH. T. Dowson,
F.R. Met. Soc., for the presentation of a large collection of weights
and measures formed by the late Mr. James Yates, F.R.S., member
of the Metric Committee of the British Association, with books
and pamphlets bearing on the Metric System. At the request of
Mr. H. J. Chaney, Warden of the Standards, a number of these
works, copies of which were not to be found in the Library of the
Standards Office, were handed over by the Committee to that Depart-
ment.

The Observatory has also been presented by the Rev. John Rigaud,
B.D., Fellow of Magdalen College, Oxford, with a framed sketch
portrait of his father, Stephen Peter Rigaud, Hsq., M.A., F.R.S.,
Savilian Professor of Astronomy and Radcliffe Observer, who, in the
early part of the present century, during the Oxford vacations, was
in the habit of relieving his uncle, the Rev. 8S. Demainbray, of his
charge as “ The King’s Observer at Kew.”

Hehibition.—A number of instruments of interest were exhibited
at the Sixth Annual Exhibition of the Royal Meteorological Society,
which was devoted to sunshine recorders and actinometry, and held in
the rooms of the Institution of Civil Engineers in March last.

International Inventions Hxhibition.—The Committee have exhibited
in Groups 27 and 29 at this Exhibition articles of which the following
is the description as given in the Official Catalogue :—

‘Forms and papers illustrating the methods employed at the Kew
Observatory, Richmond, in examining, rating, and certifying as to
the performance of watches, pocket chronometers and chrouographs
for the manufacturers and general public.”

““(1.) Photo-nephograph or Cloud-height Measuring Apparatus.
(2.) Apparatus employed in the examination and testing of sextants,
quadrants, theodolites, &c. (3.) Specimens of certificates awarded
to instruments, and general information relating thereto.”

The Jury Commission has awarded to the Committee a Diploma of
Honour for their exhibits.

The Superintendent, with the consent of the Committee, read the

* This paper was based upon a short note on the History of the Observatory,
submitted by Mr. McLaughlin, one of the staff, to a local Society in Richmond.

ee |

Report of the Kew Committee. 323

following papers before the Aberdeen Meeting of the British Associa-
tion :—

““On the Hrrors of first class Sextants, as determined from the
Records of the Verification Department at the Kew Observatory ;”’
and “On the Behavicur of first class Watches whilst undergoing
Tests in the Rating Department of the Kew Observatory.”

At the request of the Royal Cornwall Polytechnic Society, the Kew
Committee have undertaken the purchase and trial of a set of
Magnetographs now in course of construction for the Falmouth
Observatory, on a new plan, the designs and specification for which
have been prepared by Mr. Whipple, as the Royal Society grant was
inadequate to provide for instruments of the ordinary Kew pattern.

By the kindness of Captain Rung, ef the Meteorological Institute,
Copenhagen, the Superintendent has been able to procure two spe-
cimens of his apparatus for whirling thermometers. These, with the
necessary thermometers, have been forwarded to Dr. Doberck, the
Government Astronomer at Hong Kong.

Magnetic Disturbances.—By permission of the Committee, Mr. W.
Lant Carpenter has visited the Observatory for the purpose of
extracting certain magnetic information from the tabulations, in order
to assist Professor Balfour Stewart in his investigations on Terrestrial
Maenetism.

Workshop.—The machine tools procured by grants from the Govern-
ment Grant Fund or the Donation Fund for the use of the Kew
Observatory have been kept in thorough order. In consequence of
the increased number of clinical thermometers submitted for verifica-
tion, a new specially constructed Galton testing apparatus has been
purchased at a cost of 38/., as well as a duplicate Hall-marking
apparatus. Accommodation has been found in the workshop for the
assistants engaged in the new department specially devoted to the
examination of this class of instruments.

Inbrary.—During the year the Library has received, as presents, the
publications of--

26 Scientific Societies and Institutions of Great Britain, and

78 Foreign and Colonial Scientific Societies and Institutions.

House, Grounds, and Footpath.—These have all been kept in order
during the year. <A step ladder has been set up to give more con-
venient access to the roof of the Sun-room for the purpose of testing
Anemometers. The dome has also been lifted and its fittings
readjusted. The necessary external repairs to the building, as well
as an examination and cleaning of the drains, have been effected by
Her Majesty’s Commissioners of Works.

The Committee has addressed a memorial to Her Majesty’s Com-
missioners of Woods and Forests, through the President and Council
of the Royal Society, with the object of securing free passage to the

324 Report of the Kew Committee.

Observatory at all hours through the yard tenanted by the lessee of
the park at the entrance gates, and negotiations are in progress on
the subject.

The Committee has effected an insurance of the contents of the
Observatory and outbuildings against loss by fire in the Liverpool,
London, and Globe Fire Insurance Company.

PERSONAL HsTaABLISHMENT.
The staff employed is as follows :—

G. M. Whipple, B.Sc., Superintendent.

T. W. Baker, Chief Assistant and Magnetic Observer.
H. McLaughlin, Librarian and Accountant.

H. G. Constable, Solar Observations and Watch Rating.
We ing o:
J. Foster,
T. Gunter,
W. Boxall,
H. Dagwell.
H. A. Widdowson.

F. Oliver.

W. C. Gough.

H. Redding.

M. Baker, Messenger and Care-taker.

Verification Department.

The following resignations have taken place during the year :—
H. Barton, C. Henley, and A. Nish.

325

Report of the Kew Committee.

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Report of the Kew Committee. 327
APPENDIX I.

Magnetic Observations made at the Kew Observatory, Lat. 51° 28' 6" N.
Long. 0° 1" 15°1 W., for the year October 1884 to September 1885.

The observations of Deflection and Vibration given in the annexed
Tables were all made with the Collimator Magnet marked K C 1, and
the Kew 9-inch Unifilar Magnetometer by Jones.

The Declination observations have also been made with the same
Magnetometer, Collimator Magnets 101 B and N EK being employed for
the purpose.

The Dip observations were made with Dip-circle Barrow No. 33, the
needles 1 and 2 only being used; these are 34 inches in length.

The results of the observations of Deflection and Vibration give the
values of the Horizontal Force, which, being combined with the Dip
observations, furnish the Vertical and Total Forces.

These are expressed in both English and metrical scales—the unit in
the first being one foot, one second of mean solar time, and one grain;
and in the other one millimetre, one second of time, and one milligramme,
the factor for reducing the English to metric values being 0°46108.

By request, the corresponding values in C.G.S. measure are also given.

The value of log 7*K employed in the reduction is 1°64365 at tem-
perature 60° F.

The induction-coefficient pw is 0°000194.

The correction of the magnetic power for temperature ¢, to an
adopted standard temperature of 35° F. is

0:0001194(t,—35) + 0:000,000,213(¢,—35)?.

The true distances between the centres of the deflecting and deflected
magnets, when the former is placed at the divisions of the deflection-
bar marked 1:0 foot and 1°3 feet, are 1:000075 feet and 1°300697 feet
respectively.

The times of vibration given in the Table are each derived from the
mean of 12 or 14: observations of the time occupied by the magnet in
making 100 vibrations, corrections being applied for the torsion-force
of the suspension-thread subsequently.

No corrections have been made for rate of chronometer or arc of
vibration, these being always very small.

The value of the constant P, employed in the formula of reduction
m =(1—~), is —0-00129.
pa 7X’ To"

In each observation of absolute Declination the instrumental read-
ings have been referred to marks made upon the stone obelisk erected
1,250 feet north of the Observatory as a meridian mark, the orientation
of which, with respect to the Magnetometer, was determined by the
late Mr. Welsh, and has since been carefully verified.

The observations have been made and reduced by Mr. T. W. Baker.

328 Report of the Kew Committee.

Vibration Observations for ‘A bsolage Measure of Horizontal Force.

Table. I.
Tempe-| Time of ;
Month. G. M. T. rature. es 108 mX. May
? Fahr. | Vibration.* ere OL i.

1884. a. Thom A secs.
October:; ..i.....| 29 11-254 mM} 48:1 46517 0°30820 | 0°51988
30 12 29P.M. | 563 46542
2 eM ge 4°6530 | 0°30841 | 0°51976

November........| 27 11 444.m. 46°7 46472
3 51 P.M. 49°3 46473 0°30906 0°51979
December. he. .: 29 11 57 a.m. 89:1 46493
2 55 P.M. 40°3 46458 0°30850 0751948
1885.
dianiuaryec es aan ss 29 1 50P.M. 550 4°6509 0°30880 | 0°51978

30 12 19P.M. 51°6 46543 0°30798 | 0°51937

Hebruary 2... ..(-260 41 52 A Mo) oles 46503 a
3 6pm. | 540 4° 6482 0°30898 | 0:51970

WATCH: oirsheystere 6 eae 23 12 10P.m. 47-0 46494.
2-10P.M. 48°0 4-64.77 0°30876 0°51965

24 12 21 P.M. 49-1 46496
Pe BID Dil-6 4-64.98 0°30870 0°51970

VUd Saka onasdo 27 11 384.M. 64:7 46555
2 55 P.M. 71°8 4°6552 0°30875 | 0°51971
28 219PM. | 742 46590 0°30846 | 0°51976

WEN Bona ao sua ce) eile WZ Nout 68°8 46608
2 55 P.M. 75°0 4°6583 0°30822 | 051983
FAS Pay See is 67°5 46566 0°30850 | 051926

PUNE! )5 aes slew ot ZO Ok 2s ACME 63°1 4°6538
2 57 P.M. 72°5 4°6523 0°30915 | 0°51971

July levy oon es 29 11 28a.m.| 660 | 46572
256p.m.| 71°8 | 46540 | 0:30872 | 0°51965

AU GUSE 6 «6.0m e)seia | CO 20 AGM al a nGa 4°6544
248Pp.mM. | 668 4:6563 0°30859 | 051955

September........| 28 11 384a.m. | 55°0 4654.2

3 Ly PM. Vek y, 46522 0°30857 | 0°51922

* A vibration is a movement of the magnet from a position of maximum displace-
ment on one side of the meridian to a corresponding position on the other side.
+ m=wmagnetic moment of vibrating magnet.

Report of the Kew Committee. 329

Observations of Deflection for Absolute Measure of Horizontal Force.

Table II.
Distances Tempe 3
Month. G. M. T. o apne, | eseereel ee
Centres of wae Deflection.
Magnets. : Mean
1884. di; ht am: foot. . th a eta
October. ccs... 29 12 15P.M. 1:0 51:4 5 21 56 :
13 a 655 41 | 9 12860
30 11 45 a.m 1:0 50°7 15 21 28
13 ie AIRS oe.
= ire T20 57-9 | 151858 | 2 12819
13 yo) 6 54 45
November...... 27 12 15 PM. 1:0 AT 7 15 19 54
13 waa Gis G
Dials 1-0 49-4 | 15 19 53 | 212259
13 ae 6 54 56
Weeonees. | 2942 36pm 1-0 40°1 | 15 21 30
13 ee Graausen
213.) 1-0 40-0 | 15 20 44 | 9 12264
ae 13 ie 6 55 25
Tanuary........ 99 247~Mi 1-0 RAO Vola ae Te |
1:3 we 6 54 4g | 9°12288
30 11 27a.ml ‘1-0 AOPGu i 15920 480.1
13 iy 655 13 | 912298
February ......| 26 12 28 P.M. 1:0 53°0 15 19 22
1:3 oe Pye rr a Belines
223 ,, 1-0 Bulb | a le axl | eee
13 6 54 34
Mirena ot.’ 23.11 33am) 1-0 AG OWI Ise 3
13 6 Soyo
249em| 1-0 47-3 | 15 20 37 | 2 12266
13 6754 55
2411 40am) 1:0 45-7 | 15 20 58
13 6 55°15) \ co
2446p! 10 52-5 | 15.20 Q | 9 12279
13 De 6 54 50
April.......-..| 2712 20e.m] 1-0 65°6 | 15 18 34
13 oy 654 14h
2490. 1-0 69-8 | 151645 | 912277
13 es 6 53 25
28 258 ,, 10 72-2 15 7 18 ee
My yoke et 2812 4pm) 1-0 Pio | is aoa
13 tae 654-26
212 ,, 1-0 Tie Osetia) Neon teoRe
13 fae 6 54 10
29 322 , 10 70°5 15 16 10 ae
SETS: (os Pee y orang 2912 9pm 1:0 64°8 by ily) 3B
13 wie Gas aah dow
Pl Ve hAC0 Ro ene gan ie 12200
13 a 653 4

330 Report of the Kew Committee.

Table [1—continued.

‘Distances emia:
Month G. M. T of Sees Observed Logs.
: “ea eee Centres of Tsieve ‘| Deflection. ».¢
Magnets. a Mean.
1885. d. h. m. foot. } he
uly oe ese ee 29nte Wy earl bo 67-6 | 15 17 42
13 ule 6 4 ae
Ce ee ieee) 1-4. | 15 166 eee
13 eat 6 53 25
August ........| 2812 5pm} 1-0 64:4 | 15
13 oe 6 5A oe
DP opt, | oko 65-9 | 15 17 te eens
13 a 6 5a
September......| 28 12 37P.| 1-0 57-0 | 15 18 22
13 ee 6 54 27. 1 a
232 |; 10 60-8 | 15 16a

13 eege 6 53 26

Report of the Kew Committee.

Inclination Observations.—Table III.

ddl

Noy.

1885.

Jan.

Feb.

Mar.

30
31

26
28

23
24.

25

25
26

|: | ween |: | wheter

Inclination.

Needle.

North.

A
°

oO 4
67 39°31
38°43
38°59
39°90
39°25
39°66

Ose O99

67 40°47
40°31
38°63
38°90

.| 67 39°58

67 39°03
39°40
38°25
39°44

67 39:03

67 38°46
29°22
39°50
39°56

67 39:18

37°53
38°87
38°68
37°68
36°88
37°40

67 37°84

Hh 67 (sob
2 37°53
]
2

67

NrNMRrNF

38°06
38°85

.| 67 37°85

Month.

1885.
April

May

June

July

Sept.

| Needle.

G.. bs m: No.
20 2 45 P.M.

21

2
24 3
3

26
27

30

23

25

27 3
28

25
27
28

21
22

25

Inclination.

North.

te) 4
67 38°44
38°25
37°06
37°22
36°41
37°13

67 37°42

67 40°69
38°10
40°25
40°03
39°00
39°06

67 39°52

67 38:18
38°28
37°26
37°53

-| 67 37°81

67 37:97
37°22
37°03
37°06

-| 67 37°32

67 37°62
36°59
36°09
37°62
38°25
37°34

67 37°25

67 36:09
37°34
38°18

— 36°40
39°31
39°90

67 37°87

Report of the Kew Committee.

332

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336 » Report of the Kew Committee.

Table IV.

Summary of Sun-spot Observations made at the Kew Observatory.

atone, | pte, | new grompe | Daye ith
enumerated. ear
1884. |
October onaccc vaemte oc: 14 11 0
November .¢.572 os. . 6% 13 PLCS 1
December ss: jem staat sie | 7 0
1885.
SV TAUATY; coe myer coe erersicie wie 6 6 0
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Marchivs 5 ft4e scccste seee 20 cies b 1
INGRNS FAs S55 Sach odo Ts 18 8 0
Mairi intees eae 17 14 0
Tine eee 13 ee) 0
UUUb Bs aitoo so so oa cela 20 10 0
LTE 5556455 Soc mds | 15 8 0
September. ........ sees 11 6 0

Dotalecse ses eee 170 112 2

337

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TIT XIGNHddV

308

~

Report of the Kew Committee.

APPENDIX IV.

list of Instruments, Apparatus, &c., the Property of the Kew Com-
mittee, at the present date out of the custody of the Superintendent,

on Loan.

To whom lent.

G. J. Symons, F.R.S.

The Science and Art
Department, South
Kensington.

Dr. T. Thorpe, F.R.S.

Major Herschel, R.E.,
E.R.S.

Mr. R. W. Munro ..

Lieutenant A. Gordon,
R.N.

Major-General Sir H.

Lefroy, R.A., F.R.S.

Professor W. Grylls
Adams, F.R.S.

Professor O. J. Lodge

Mr. W. F. Harrison .

Captain W. de W.
Abney, F.R.S.

Articles.

Old Kew Thermometer Screen ............--
Portable Transit. Instrument;... <i. eeneeoee

The articles specified in the list in the Annual
Report for 1876, with the exception of the
Photo-Heliograph, Pendulum Apparatus,
Dip-Circle, Unifilar, and Hodgkinson’s Acti-

nometer.

Three Open Scale Standard Thermometers,
Nos. 561, 562, and 563.
Tripod Stand .:03/.. one ne

Invariable Pendulums, Nos. 1821, 4, and 11,
Shelton Clock, R.S. No. 34. Stands, and
Accessories.

Standard Straight-edge. ......6.e000-5 sees

Unifilar Magnetometer by Jones, No. 102,
complete, with three Magnets and Deflection

ar.

Dip-Circle, by Barrow, one Pair of Needles,
and Magnetizing Bars.

One Bifilar Magnetometer.

One Declinometer.

Two Tripod Stands.
Toronto Daily Registers for 1850-3 .

Unifilar Magnetometer, by Jones, No. 101,
complete.

Unifilar Magnetometer, by Jones, No. 106,
complete.
Barrow Dip-Circle, No. 23, with two Needles,
and Magnetizing Bars.
Tripod Stand.

Condensing lens and copper lamp chimney

Mason’s Hygrometer, by Jones ..........

Date

of loan.

1879
1883
1881

1881
1883

1885
1883

1883

1883
1885

i 188).] Presents. 339

Presents, November 19, 1885.
Transactions.

Amsterdam :—Genootschap Natura Artis Magistra. Bijdragen tot

de Dierkunde. Aflevering 12. 4to. Amsterdam 1885.
The Society.
Batavia :—K. Natuurkundige Vereeniging in Nederlandsch-Indié.
Natuurkundig Tijdschrift voor Nederlandsch-Indié. Deel
XLIV. 8vo. Batavia 1885. Catalogus der Bibliotheek. 8vo.

Batavia 1884. The Society.
Berlin:—K. Akademie der Wissenschaften. Abhandlungen. 1884.
Ato. Berlin 1885. The Academy.
Bologna :—Accademia delle Scienze. Memorie. Serie 4. Tomo V.
Ato. Bologna 1883. The Academy.
Boston :—American Academy of Arts and Sciences. Proceedings.
New Series. Vol. XII. 8vo. Boston 1885. | The Academy.

Brussels :—Academie Royale des Sciences. Biographie Nationale.
Tome VIII. Fasc. 1-2. 8vo. Bruwvelles 1885. Mémoires. Tome
XLV. 4to. Bruvelles 1884. Mémoires Couronnés. Tome
XXXVI. 8vo. Bruxelles 1884. Mémoires Couronnés et
Mémoires des Savants Etrangers. Tome XLVI. 4to Brucelles
1€84. The Academy.

Société Malacologique de Belgique. Annales. Tomes XV,
XVIII, XIX. 8vo. Bruxelles 1880, 1883-1884.
The Society.

Cherbourg :—Société Nationale des Sciences Naturelles. Catalogue

de la Bibliothéque. Livr. III. Partie II. 8vo. Cherboury

1883. The Society.
Société Nationale des Sciences Naturelles et Mathématiques.
Mémoires. Tome XXIV. 8vo. Paris 1884. The Society.
Danzig :—Naturforschende Gesellschaft. Schriften. Band VI.
Heft 2. 8vo. Danziy 1885. The Society.
Edinburgh :—Geological Society. Transactions. Vol. IV. Part 3.
Vol. V. Part 1. 8vo. Hdinburgh 1883, 1885. The Society.
Falmouth :—Royal Cornwall Polytechnic Society. 52nd Annual
Report, 1884. 8vo. Falmouth. The Society.
Glasgow :—Philosophical Society. Proceedings. Vol. XVI. 8vo.
Glasgow 1885. The Society.

Leipzig :—Konigl. Sachs. Gesellschaft der Wissenschaften. Ab-
handlungen. Math.-Phys. Classe. Band XIII. Nos. 2-4.
8vo. Leipzig 1884-1885. Abhandlungen. Phil.-Hist. Classe.
Band X. Nos. 1-2. 8vo. Leipzig 1885. Berichte. Math.-
Phys. Classe. Band XXXVI. Nos. 1-2. Band XXXVII.

340 Presents. [Nov. 19,

Transactions (continued).
Nos. 1-2. 8vo. Leipzig 1885. Berichte. Phil.-Hist. Classe.
Band XXXVI. Nos. 1-4. Band XXXVII. Nos. 1-3. 8vo.

Leipzig 1884-85 The Society.
Naturforschende Gesellschaft. Sitzungsberichte. Jahrg. XI,
1884. 8vo. Leipzig 1885. | The Society.

London :—Institution of Civil Engineers. Minutes of Proceedings.
Vols. LXXX—LXXXIT. 8vo. London 1885. Heat in its
Mechanical Applications. 8vo. London 1885. Charter, Bye-
Laws, and List of Members. 8vo. London 1885.

The Institution.

Institution of Mechanical Engineers. Proceedings. Nos. 3-4.

8vo. London 1885. General Index to Proceedings, 1874-1884.

8vo. London. The Institution.
Tron and Steel Institute. Journal. No.1. 8vo. London 1885.

The Institute.

Royal Astronomical Society. Memoirs. Vol. XLVII. Part 2.

Ato. London 1885. List of Fellows, June 1885. 8vo.

The Society.

Royal Microscopical Society. Journal. Ser. 2. Vol. V. Parts

4,5. 8vo. London 1885. , The Society.

Society of Antiquaries. Archeologia. Vol. XLVIII. 4to. Lon-

don 1885. Proceedings. Series 2. Vol. X. No. 2. 8vo. London

1885. List of Fellows. June 1885. 8vo. The Society.

Newcastle-upon-Tyne :—North of England Institute of Mining and
Mechanical Engineers. Transactions. Vol. XXXIV. Parts

3-0. 8vo. Newcastle-upon-Tyne 1885. The Institute.
Palermo :—Societa di Scienze Naturali ed Economiche. Giornale.

| Vol. XVI. 4to. Palermo 1884. The Society.
Paris:—Ecole Normale Supérieure. Annales. Sér. 3. Tome II.
Nos. 4-8. 4to. Paris 1885. The School.

Faculté des Sciences. Theses Mathématiques. Par M. Georges
Humbert. 4to. Paris 1885.
Muséum d'Histoire Naturelle. Nouvelles Archives. Sér. 2.
Tome VII. 4to. Paris 1885. The Museum.
Société Frangaise de Physique. Séances. Juillet- Decembre,
1884, Janvier—Juillet, 1885. 8vo. Paris 1885. Collection de
Mémoires relatifs a la Physique. Tome II. 8vo. Paris 1885.
The Society.
T6ki6 :—University. Memoirs. No.2. 2 vols. 8vo. Téki6 1885.
Appendix to Memoir No. 5. 8vo. T6ki6 1885.
_ The University.
Toronto :—Canadian Institute. Proceedings. Series 3. Vol. III.
Fasc. 2. 8vo. Toronto 1885. (Two copies.)
The Canadian Government.

1885.] Presents. | 341

Transactions (continued). :

Vienna :—K. K. Geologische Reichsanstalt. Jahrbuch. Band

XXXV. Hefte 1-3. 8vo. Wien 1885. Abhandlungen. Band

XI. Abth.1. 4to. Wien 1885. The Institution.

Yokohama:—Asiatic Society of Japan. Transactions. Vol. XII.
Part IV ; Vol. XIII. Part 1. 8vo. Yokohama 1885.

| The Society.

Observations and Reports.

- Caleutta:—Geological Survey of India. Paleontologia Indica.
Ser. 4. Vol. I. Part 5; Ser. 10. Vol. Ill. Part. 6; Ser. 13.
Vol. I. Part 4 (fase. 5). 4to. Calcutta 1885. Memoirs.
Vol. XXI. Parts 3-4. 8vo. Calcutta 1885. Records. Vol.
XVIII. Part 3. 8vo. Calcutia 1885. The Survey.

Meteorological Office. Observations recorded at Six Stations in
India. December, 1884, and January to April, 1885. Ato.
Description of the Stations. 4to. 1885. Report on the
Meteorology of India in 1883. By H. F. Blanford, F.R.S.
Ato. Calcutta 1885. Indian Meteorological Memoirs. Vol. II.
Part 4. By H. F. Blanford, F.R.S. 4to. Calcutta 1885.

The Office.

Dun Echt :—Observatory. Mauritius Expedition, 1874. Divi-
sion 2, 4to. Dun Hecht 1885. Circulars. Nos. 94-98. |

The Karl of Crawford, F.R.S.

Hong Kong :—Observatory. Observations and Researches made at
the Observatory, 1884. By W. Doberck. Folio. Hong Kong
1885. The Observatory.

London :—Royal Observatory, Greenwich. Observations, 1883. 4to.
London 1885. Greenwich Spectroscopic and Photographic
Observations, 1883. 4to. 1885. Greenwich Magnetical and
Meteorological Observations, 1883. 4to. 1886. Greenwich
Astronomical Results, 1883. 4to. 1885. Report of the
Astronomer Royal to the Board of Visitors, 1885. 4to.

Tiflis :—Physikalisches Observatorium. Magnetische Beobach-
tungen, 1883. Small 4to. Tiflis 1885. Meteorologische
Beobachtungen, 1883-84. Small 4to. Tiflis 1885. Bevbach-
tungen der Temperatur des Erdbodens, 1831-83. Small 4to.

Tiflts 1885. The Observatory.

Journals. |
American Journal of Philology. Vol. VI. No. 2. 8vo. Baltimore
1885. The Editor.

Annales des Mines. Série 8. Tome VII. Livr. 2, 3. 8vo. Paris
1885. L’Ecole des Mines.

342 Presents. [Nov. 19,

Journals (continued).
Annales Hydrographiques. Série 2. No. 679. 8vo. Paris 1885.
Dépot de la Marine.
Archives Néerlandaises des Sciences Exactes et Naturelles. Tome
AS Livr. 1,2. 8vo. Harlem 1885.
Société Hollandaise des Sciences.
hecipidd (The). Vol. II. Nos. 7,8. 8vo. London 1885.
Dr. B. W. Richardson, F.RB.S.
Astronomie (L’). Année IV. Nos. 5-9. 8vo. Paris 1885.
The Editor.

Abney (Capt.) Photography with Emulsions. 8vo. London 1885.
The Author.

Ashburner (C. A.) Brief Description of the Anthracite Coal Fields

of Pennsylvania. 8vo. 1884. The Author.
Bailey (W. H.) Anniversary Address before the Medical Society of
New York. 8vo. Syracuse, N.Y. 1881. The Author.
Ball (V.), F.R.S. Report on the Museums of America and Canada.
Svo. 1884. The Author.
Barlow (William) New Theories of Matter and of Force. 8vo. London
1885. | The Author.
Beddoe (John), F.R.S. The Races of Britain. 8vo. Bristol 1885.
The Author.
Benson (L. 8.) Creation. Man’s Fall explained. 8vo. New York
1885. The Author.
Braithwaite (R.) The British Moss-Flora. Part IX. 8vo. London
1885. The Author.

Bredichin (Th.) Sur les Oscillations des Jets d’Hmission dans les
Cométes. 8vo. Moscou 1885. Révision des valeurs numeriques
de la Force Répulsive. 8vo. Moscou 1885. The Author.

Cauchy (Augustin) Quvres. Sériel. Tome V. 4to. Paris 1885.

Académie des Sciences.

Collings (W. J.) Specificity and Evolutionin Disease. 8vo. London
1884. The Author.

Cremona (Luigi), For. Mem. R.S. Les Figures réciproques en
Statique graphique. 2 Vols. (Texte et atlas.) 8vo. Paris 1885.

De Penning (G. A.) On the Nature of Gravity. 8vo. Calcutta
1885. On the Effect of Gravity. 8vo. Calcutta 1885.

The Author.

Dewalque (G.) Stries glaciaires dans la vallée l’Ambléve. 8vo.

Inége 1885. The Author.
Gibbs (Woolcott) Researches on the Complex Inorganic Acids. 8vo.
Cambridje, Mass. 1885. The Author.

Gore (J. E.) Catalogue of Suspected Variable Stars. 8vo. Dublin
1885. The Author.

1885. ] Pessente 343,

Gravis (A.) Recherches Anatomiques sur les organes végétatifs de
VUrtica dioca L. 4to. Bruzelles 1885. The Author.
Hensel (Julius) Eine neue Theorie der Lebens-Chemie in typischen
Figuren veranschaulicht. 8vo. Christiania 1885. The Author.
Hill (S. A.) On Observations of the Solar Thermometer at Lucknow.
8vo. Calcutta 1885. The Author.
Hirn (G.-A.) La Notion de Force da la eeience Moderne. 8vo.
Paris 1885. Résumé des Observations Météorologiques faites
pendant les années 1882-84, en quatre points du Haut-Rhin et
des Vosges. 8vo. Colmar 1885. Rougeurs Crépusculaires

observées 4 la fin de 1883. 8vo. Paris 1885. The Author.
Hirth (F.) China and the Roman Orient. 8vo. Lezpsic 1885.
The Author.

Hoge (Jabez) Homer Colour-blind. 8vo. 1885. Testing for Colour-
blindness in the Mercantile Marine. 8vo. 1885. Arsenical Poison-
ing by Wall-papers and other Manufactured Articles. 8vo.
[London] 1885. The Author.

Jervois (Sir F. W. D.) New Zealand Institute. Anniversary
Address of the President. 8vo. Wellington 1884.

The Institute.

Jones (T. Rupert), F.R.S. The Origin and Constitution of Chalk
and Flint. &vo. Hertford 1885. On the Ostracoda of the
Purbeck Formation, with Notes on the Wealden species. 8vo.

1885. The Author.
Ketteler (Dr. E.) Theoretische Optik. 8vo. Braunschweig 1885.
The Author.
Kluk-Kluezycki (V. P.) Umsturz Irrthiimlicher Schullehren. 8vo.
Krakauw 1889. The Author.
Kolliker (A.), For. Mem. R.S. Stiftchenzellen in der Epidermis von
Froschlarven. 8vo. Wurtzburg 1885. The Author.
Kops (Jan) and F. W. van Heden. Flora Batava. Nos. 269-70. 4to.
Leiden [1885 }. The Netherlands Legation.

Lewis (H. Carvill) Marginal Kames. 8vo. 1885. A great Trap
Dyke across South-Eastern Pennsylvania. 8vo. 1885.

The Author.
_ Liveing (Prof.), F.R.S. Chemical Equilibrium the result of the dis-
sipation of Energy. 8vo. Cambridge 1885. The Author.

Liversidge (A.), F.R.S. Analysis of Slate in contact with Granite
from Preservation Inlet, N. Zealand. 8vo. 1884. On the Che-
mical Composition of certain Rocks in N.S.W. 8yvo. Sydney
1883. On some N.S.W. Minerals. 8vo. Sydney 1885.

The Author.

Loomis (Hlias) Contributions to Meteorology. (Revised Edition.)
Ato. New Haven, Conn. 1885.

Maltese (F.) Cielo. 8vo. Vittoria 1885. The Author.

B44 Presents. [Nov. 19,

Millardet (A.) Histoire des Principales Varictés et Especes de Vignes
d’origine Américaine qui résistent au Phylloxera. 4to. Paris
1885. The Author.

Moore (F.) The Lepidoptera of Ceylon. Part XI. 4to. London 1885.

Government of Ceylon.

Mueller (Baron von), F.R.S. Descriptive Notes of Papuan Plants.
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Prota-Giurleo (Prof. Nestore) Comunicazione fatte all’ undecimo
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348 Mr. E. Schunck.

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Hungarian Academy.

“Contributions to the Chemistry of Chlorophyll.” By Epwarp
ScHUNOK, F.R.S. Received April 30, 1885. Read May 7,
1885.

Action of Acids on Chlorophyll.

Every one who has worked with chlorophyll must be familiar with
the peculiar effect produced on the addition of acids to its soiutions.
If an alcoholic solution be taken, the colour of the solution changes
when an acid is added from bright green to yellowish-green, and the
spectrum at the same time undergoes alteration. After standing
some time the solution gives a dark green deposit, which, after
separation from the greenish-yellow liquid, shows when dissolved in
boiling alcohol or ether, the spectrum of so-called ‘acid chlorophyll.”

This change is attributed by some to a simple modification of the
chlorophyll; others consider it due to the formation of products of
decomposition. The latter view is, I have no doubt, the correct one.

In order to obtain the products due to the action of acids on chloro-
phyll, I find it best to use hydrochloric acid. Fresh green leaves of
any kind are extracted, without undergoing any preliminary treat-
ment, with boiling spirits of wine. The extract, which should be of
an intense green, is poured off from the exhausted leaves, and
allowed to stand for a day or two. During this time, a light green
somewhat slimy deposit is formed, consisting chiefly of wax and
fatty matters coloured by chlorophyll.

On examining this deposit closely, it will almost invariably be
found to contain, interspersed in the mass, small, red, glistening
crystals. These crystals consist of a body first observed by Hartsen,*
and called by him, ‘‘ chrysophyll,”’ a name which it would be well to
retain.t The deposit having been separated by filtration, a current
of hydrochloric acid gas is passed into the dark green filtrate. This
produces at once a dark green almost black voluminous precipitate,

* “Neue Untersuchungen tiber das Chlorophyll,” “ Chem. Centralblatt,’’ 1875,
S. 613.

+ The erythrophyll of Bougarel and the crystallised xanthophyll of other
chemists are doubtless identical with chrysophyll.

Contributions to the Chemistry of Chlorophyll. 349

which increases in quantity on standing. After the precipitate has
settled, the liquid appears greenish-yellow; it shows the spectrum of
acid chlorophyll, due to the presence of colouring matters from the
precipitate, these being not entirely insoluble in alcohol, but it also
contains yellow colouring matters which darken the blue end of the
spectrum, as well as other bodies extracted from the leaves which
have no connexion with chlorophyll. |
The dark green precipitate is now filtered off and washed with

spirits until the filtrate appears nearly colourless. It contains besides
impurities, which are chiefly of a fatty nature, two distinct colouring
matters identical with the phyllocyanin and phylloxanthin of Fremy.
These names I see no reason to change. They have been retained by
Tschirch,* one of the latest writers on the subject. The method I
adopt for separating the two substances is essentially the same as
that of Fremy. I have tried other methods, but they have led to no
result. The use of alkaline solvents is to be avoided, since both
colouring matters are changed by the action of alkalis. The crude
product of the action of the acid is first treated with ether, in which
nearly the whole dissolves. The insoluble matter having been
filtered off, the filtrate is mixed with about its own volume of fuming
hydrochloric acid. The mixture, after being well shaken, is left to
stand, when it separates into two layers, an upper yellowish-green
one, containing phylloxanthin and a great part of the fatty matters,
and a lower dark blue one, containing phyllocyanin. This is the
experiment of Fremy, which is so often referred to in memoirs on
chlorophyll, as having led him to the conclusion that chlorophyll was
a compound or mixture of a blue and a yellow colouring matter. I
propose first to give an account of phyllocyanin, the colouring matter
of the blue layer.

The two liquids obtained in the manner just described are
separated in the usual way, and the lower blue one is agitated with
fresh ether, the process being repeated until the ether appears nearly
colourless, and the phylloxanthin has been removed. After a short
exposure, to allow the ether contained in it to evaporate, it is mixed
with water, which produces a dark blue precipitate. This is filtered
off, washed to remove hydrochloric acid, then dissolved in boiling
glacial acetic acid. This solution on cooling gives a crystalline
deposit of phyllocyanin, which is filtered off and récrystallised from
acetic acid. If, on decomposing a little of it with boiling dilute nitric
acid, nothing is left undissolved, the product may be considered pure,
but if yellow oily drops appear on the surface of the boiling acid, the
process of crystallisation from acetic acid must be repeated. The
product is finally filtered off, washed with acetic acid, and dried.

_ By the process just described, I have obtained phyllocyanin from

* “Untersuchungen tiber das Chlorophyll,” Berlin, 1884.

350 Mr. E. Schunck.

grass, from ivy leaves, from the leaves of the common thorn, and
from the fronds of Pteris aquilina. No difference could be dis-
cerned between the different specimens obtained.

_ Properties of Phyllocyanin.

When dry, phyllocyanin has the appearance of a dark blue mass,
which may easily be reduced to a fine powder. It resembles indigo,
but when rubbed with a hard body it remains blue, and does not
exhibit the coppery lustre which characterises indigo. Under a lens,
small white glistening points are seen dotting the mass, produced by
reflexion from crystalline surfaces. Hxamined under the microscope,
it is found to consist almost entirely of elongated rhomboidal, or
irregularly six-sided crystalline plates, which are generally opaque,
but when very thin are translucent and then appear olive-coloured by
transmitted light. Phyllocyanin is insoluble in water. It dissolves
in boiling alcohol, but a great part of the substance dissolved separates
out on the solution cooling, as a voluminous mass, consisting of
microscopic crystals. It is more soluble in ether, glacial acetic acid,
benzol, and carbon disulphide than in alcohol, but the best solvent is
chloroform, which takes up large quantities of phyllocyanin even in the
cold. A minute quantity of the substance imparts an intense colour
to any of these solvents, especially chloroform. It is only on diluting
largely that these solutions lose their opacity. They then appear of a
dull green or olive colour, and show the well-known and often
described spectrum of ‘‘ acid chlorophyll,” consisting of five bands of
various intensity. The solutions fluoresce, but not so strongly as
solutions of chlorophyll.

When the ethereal solution is mixed with concentrated hydro-
chloric acid, the whole of the phyllocyanin is taken up by the acid,
yielding a dark greenish-blue solution, which sinks to the bottom.
Should phylloxanthin be present, it will be found in the upper
ethereal layer, which then shows a yellowish-green tint, and an ab-
sorption spectrum differing from that of phyllocyanin. The lower
greenish-blue solution shows when sufficiently dilute five absorption
bands, the spectrum, in fact, of the hydrochloric acid compound of
phyllocyanin, which differs widely from that of phyllocyanin itself.

Phyllocyanin is almost insoluble in boiling petroleum ether, and
nearly insoluble in ligroin. It dissolves easily in warm aniline.

Phyllocyanin contains nitrogen, but is free from sulphur.

Action of Heat.—When heated on platinum, phyllocyanin gives
off an acid smell, then swells up considerably, evolving gas which
burns with a smoky flame, and leaves a voluminous charcoal, which
burns away slowly, a hardly visible trace of ash being left. When
heated slowly between two watch-glasses, it swells up slightly, and

Contributions to the Chemistry of Chlorophyll. 301

becomes charred. On the lower glass there is left a black mass
which imparts no colour to boiling chloroform, and seems to be simply
charcoal. On the upper glass, there is found a small quantity of
brownish sublimate, which, under the microscope, is seen to consist
partly of crystalline needles, partly of regular rhombic crystals which
are honey-yellow by transmitted hght.

When slowly heated in an air bath to 160°, phyllocyanin remains
apparently unchanged. It is still completely soluble in chloroform,
the solution showing the usual absorption bands. On heating, how-
ever, to 180°, complete decomposition takes place, but without any
change of volume in the substance. The charred mass now imparts
to boilmg chloroform only a very faint green tinge, and when heated
in a tube, gives off no empyreumatic products, only a slight odour
of hydroeyanie acid.

Actiow of Oxilisers—On adding a little nitric acid to a boiling
saturated solution of phyllocyanin in glacial acetic acid, the solution
immediately becomes yellow, but without evolution of nitrous
fumes. It deposits nothing on cooling and standing. On the
addition of water 1t gives a dirty green flocculent precipitate, the
filtrate from which is still yellow, but shows no absorption bands.
The precipitate dissolves easily in alcohol, giving a yellow solution,
which shows a spectrum differing from that of phyllocyanin.

Phyllocyanin itself, treated with boiling dilute nitrie acid is
rapidly decomposed and dissolved with evolution ef nitrous fumes.
The solution evaporated in the water-bath leaves a residue which,
treated with water, dissolves in part. The filtrate has a bitter -
taste, and leaves, on evaporation, a soft yellow residue, in which, on
standing, some colourless crystalline needles are formed. The portion
insoluble in water dissolves easily in alcohol, giving a yellow solution
which, on evaporation, leaves a residue having a erystalline ap-
pearance, but not really crystalline when examined under the
microscope.

A hot concentrated solution of phyllocyanin in glacial acetic acid
becomes, on the addition of a little chromic acid, yellowish-green,
but deposits nothing on cooling. The solution gives with water a.
dull green precipitate, the filtrate from which is yellow, and shows no
absorption bands, while the precipitate itself, treated with ether, gives
a solution which differs somewhat as regards colour and absorption
bands from a solution of phyllecyanin.

Phyllocyanin treated with a watery solution of chromic acid, tu
which a little sulphuric acid has been added, is decomposed with
much effervescence, giving a green solution, which, after evaporation,
leaves a residue yielding to solvents only amorphous products.

Insolation.—I will introduce here what I have to say regarding the
effect of insolation on phyllocyanin, because there can be no doubt

VOL, XXXIX. 2A

Doz Mr. E. Schunck.

that the effects observed are due to oxidation. Anyone who has
observed the ease and rapidity with which a solution of chlorophyll is
bleached on exposure to light and air would be struck with the
extraordinary permanence exhibited by phyllocyanin under the
same circumstances. A moderately strong solution of phyllocyanin
when exposed to sunlight retains its colour for a long time, the last
trace disappearing only after many weeks’ exposure.

In order to observe the changes which take place, it is best to
take a chloroformic solution of phyllocyanin and expose it to
sunhght in a loosely-stoppered bottle, the stopper being occasionally
removed, and the contents shaken. The green colour of the solution
gradually becomes fainter, the absorption bands of phyllocyanin
remaining visible, After some time the colour changes to yellow, but
the solution still shows a strong band in the red, corresponding to
band I of phyllocyanin. At length this band also disappears, and
there is now nothing to be seen but the total obscuration at the
blue end of the spectrum, which most yellow solutions show. In
one experiment the chloroformic solution was exposed to alternate
bright sunlight and diffused daylight from the middle of April to the
_ middle of June, when it was filtered from a floceulent yellow deposit .
which had formed. A further exposure to the middle of August was
required to cause the entire disappearance of the band in the red.

Several products are formed during this process of insolation. The
first consists of a flocculent yellow deposit, which gradually separates
from the chloroformic solution. This deposit, after filtermg off and
washing with chloroform, is found to be easily soluble in alcohol and
caustic alkali, but insoluble in boiling water, in which it simply melts;
insoluble also in ether, ligroin, and carbon disulphide. The alcoholic
solution is yellow, shows no absorption bands, and leaves, on spon-
taneous evaporation, a residue which has a somewhat crystalline
appearance, but is found to be amorphous when examined under the
microscope. The chloroformic filtrate leaves, on evaporation, a
residue, which, on treatment with hot water, dissolves only in part.
The part left undissolved by water resembles the product deposited
from the chloroformic solution. It melts in boiling water; it is
easily soluble in alcohol, the solution being yellow and leaving, on
evaporation, a pale yellow brittle amorphous residue ; it is insoluble in
ether and carbon disulphide. The watery filtrate from this second
product, after treatment with animal charcoal, which deprives it of
most of its colour, leaves, on evaporation over sulphuric acid, a pale
yellow transparent gum-like residue, in which nothing crystalline can
be detected, and of which the following are the most characteristic
reactions :—

Heated on platinnm it is decomposed, giving off acid fumes with
an odour like those from heated tartaric acid, leaving much charcoal ;

Contributions to the Chemistry of Chlorophyll. 358

its watery solution has a strong acid reaction and a sour and at the
same time very bitter taste; the solution gives no coloration with
ferric chloride ; it evolves ammonia when boiled with caustic potash,
and it reduces Fehling’s solution on boiling.

It appears, therefore, that by msolation, phyllocyanin yields pro-
ducts which resemble, if they are not identical with, those due to the
action of nitric and chromic acids. It is possible that some of these
products may be contained in faded autumnal leaves after the chloro-
phyll has disappeared, but their indefinite character would render
their identification very difficult. Green leaves, in becoming yellow,
pass through a stage in which they yield when treated with alcohol
an extract which, though quite yellow and non-fluorescent, shows a
strong absorption band in the red. Of this fact I was forcibly
reminded when watching the progressive changes of phyllocyanin
during insolation.

Action of Chlorine.-—On passing a current of chlorine gas through
a chloroformic solution of phyllocyanin, the first effect observed is a
change of colour in the solution from dull green to a bright grass-
green, the latter colour closely resembling that of a solution of chlo-
rophyll. The solution shows an absorption spectrum which coincides
neither with that of chlorophyll nor with that of phyllocyanin.

On standing for a day or two the solution loses its bright green
colour, and acquires a reddish hue, with a green tint at the edges
where the thickness of the liquid is less. It now shows the same
number of bands as a phyllocyanin sclution, but the bands are all
nearer the red end. On evaporation it leaves a greenish-brown
amorphous residue. On passing more chlorine through the chloro-
formic solution of phyllocyanin the green colour seen at first dis-
appears, the solution becomes yellow, at last pale yellow, all the bands
characteristic of phyllocyanin at the same time disappearing. The
liquid leaves, on evaporation, a yellow amorphous residue lke resin.
This, after heating in the water-bath to drive away all traces of
hydrochloric acid, is found to contain chlorine. It does not dissolve
in boiling water, but merely softens. It is easily soluble in alcohol,
the solution being yellow and showing much obscuration in the blue
of the spectrum, but no absorption bands even when very dilute.
It dissolves only in part when treated with caustic potash lye.

Action of Bromine.—On the addition of a little bromine to a cliloro-
formic solution of phyllocyanin, the solution acquires a bright grass.
green colour, and now shows four absorption bands. On adding an
excess of bromine to the solution, heating and evaporating, an olive-
coloured amorphous product, containing bromine, is obtained, which
dissolves easily in alcohol. The solution is brownish-red, and shows
a spectrum similar to that of phyllocyanin, but having the bands all
nearer the red end.

354 Mr. E. Schunck.

Action of Acids —A mixture of 1 part of concentrated hydrochloric
acid with 9 parts of absolute alcohol, dissolves phyllocyanin easily.
In daylight the solution appears dark blue, green at the edges; in
artificial ight it appears purple. It shows a spectrum differing from
that of phyllocyanin, and more nearly resembling that of chloro-
phyll, especially as regards the fourth and fifth bands, which are
extremely faint, whereas with phyllocyanin they are very intense ;
the spectrum is, in fact, that of the hydrochloric acid compound of
phyllocyanin. On adding water to the solution, unchanged phylio-
cyanin is precipitated, but if the solution be evaporated, it leaves a
residue green by transmitted, blue by reflected light, which is no
longer phyllocyanin, for it dissolves in alcohol with a brownish-green
colour, and the solution shows a spectrum identical with that of the
product formed by the action of alkalis on phyllocyanin, and cha-
racterised by two bands in the red, and two fine, but distinct bands
in the green, which will ‘be referred to presently.

Phyllocyanin is soluble in concentrated hydrobromic acid.

It dissolves in concentrated sulphuric acid, giving a grass-green
solution, which shows a spectrum resembling that of the hydrochloric
acid compound. On the addition df water, unchanged phyllocyanin
is precipitated, but if the solution be left to stand for some time, the
phyllocyanin contained in it is changed, and the precipitate with
water now consists of several products, one of which shows the same
spectrum as that formed by the action of hydrochloric acid.

Phyllocyanin is not in any way affected by treatment with a ‘boiling
watery solution of phosphoric acid. On the addition of phosphoric
acid to a boiling alcoholic solution of phyllocyanin, the latter acquires
a purplish tint, but the spectrum remains the same, and the solution
on cooling deposits unchanged phylloeyanin.

Phyllocyanin shows no tendency to combine with oxalic, tartaric,
or citric acid, but these acids do affect it to a certain degree, that is,
they induce decomposition at temperatures at which the substance
itself remains unchanged. Mixtures of finely powdered phyllocyanin
with oxalic, tartaric, and citric acids remain unaltered when heated in
the water-bath. After being heated in an air-bath to 130°, the oxalic
acid mixture no longer contains phyllocyanin, the latter being com-
pletely charred and decomposed, whereas the tartaric and citric acid
mixtures show only slight indications of change at that temperature.
On being heated to 155°, and kept at that temperature for some time,
the tartaric and citric acid mixtures are found to contain products
which differ from phyllocyanin, without having properties such as
compounds of the latter with acids might be expected to show.
Under the conditions described, therefore, phyllocyanin shows no
tendency to combine with weak acids.

Action of Alkalis—When phyllocyanin is treated with very dilute

Contributions to the Chemistry of Chlorophyll. 309

caustic potash or soda-lye, it dissolves entirely. The solution has the
same colour as other phyllocyanin solutions, and shows a similar
spectrum, but with the bands less distinctly marked. lt gives pre-
cipitates of various shades of green, with earthy and metallic salts,
such as the chlorides of barium and calcium, lead acetate, and copper
acetate. These might, perhaps, be regarded as compounds of phyllo-
cyanin, and be called phyllocyanates. Nevertheless it is easy to
show that by mere solution in alkali, phyllocyanin undergoes a com-
plete change. If the alkaline solution be mixed with an excess of
acetic acid, and then shaken up with ether, the precipitate with acid
dissolves in the ether, the solution having the colour of a phyllocyanin
solution, and showing the characteristic absorption-bands; but if the
solution be left to stand in contact with excess of acid for some time,
its colour changes from olive to a brown or smoke colour, and it now
shows quite a different and very elegant spectrum, characterised by
two bands in the red, one of which is thin and nearer the red end
than the first band of phylocyanin, and two very fine but distinct
bands in the green, the third and fourth bands of phyllocyanin
having disappeared, while the fifth still remains. Since phyllocyanin,
before solution in alkali, is not changed appreciably by acetic acid,
even on boiling, it is evident that by the action of alkali it is in some
way metamorphosed, so as to be liable to further change when acted
on by the acid. In preparing this product of the successive action
of alkali and acid, care must be taken to operate in the cold, for if
hot alkaline lye be used, an entirely different product is formed. It
is deposited from a boiling alcoholic solution in microscopic crystals,
which are quite opaque, even in a strong light, and resemble crystal-
lised phyllocyanin. Im none of the various memoirs on chlorophyll
that have come under my notice have I seen any spectrum figured or
described at all resembling that of the solutions of this substance.
The spectrum is distinctly seen, even in exceedingly dilute solutions.

The next product of the action of alkalis on phyllocyanin is formed
when hot alkaline lye is employed. In order to obtain it, a solution
of phyllocyanin in boiling alcohol is mixed with alcoholic potash or
soda, and boiled. On standing, the solution yields a semi-crystalline
deposit of a fine purple colour by reflected light, cons:sting of a potas-
sium or sodium compound of the product formed. This is filtered off,
washed with alcohol, and then dissolved in water. The solution
gives with acetic acid a green flocculent precipitate, which is
filtered off, washed, and dissolved in boiling glacial acetic acid.
This solution on standing deposits small crystalline rosettes, which
are green by transmitted light, and of a fine purple by reflected light.
The solutions of this substance have a dull purple colour, and exhibit
a distinct spectrum, characterised by a broad very dark band in the
green. |

2a 2

396 Mr. E. Schunck.

I shall return to these products on a future occasion.

Phyllocyanin does not dissolve very readily in ammonia.

Action of Aniline—When a solution of phyllocyanin in aniline is
slowly evaporated, a residue is left consisting partly of dark granules
of phyllocyanin, partly of pale purplish-brown crystalline needles,
arranged in tufts and rosettes. The latter may be either a compound
with aniline, or a product of the action of aniline on phyllocyanin at
the ordinary temperature ; 1t is formed in minute quantities only. A
more energetic action takes place at higher temperatures. When
aniline and phyllocyanin are heated together in a sealed tube to
130° and kept at that temperature for some time, a complete
change takes place. The contents of the tube on being poured into
alcohol dissolve in part only, a crystalline mass being left undissolved,
the filtrate from which is greenish-brown, and shows the peculiar
spectrum of the first product of the action of alkalis on pbyllocyanin.
The crystallme mass on the filter dissolves partly on treatment with
boiling alcohol, and the filtered liquid deposits on cooling a quantity
of white crystalline needles in star-shaped groups, which are soluble
in ether and chloroform, but insoluble in dilute acids and alkaline
lyes. The portion of the crystalline mass left undissolved by boiling
alcohol dissolves in chloreform. The solution is red, and shows a
very characteristic spectrum, consisting of three fine but very dis-
tinct bands in the red, of which the central one is the strongest, one
very dark band covering the yellow and part of the green, which,
when the solution is so far diluted as to show only two bands in.the
red, splits up into two nearly equal bands, and lastly, one dark band
at the edge of the green and blue. The chloroformic solution leaves,
on evaporation, a semi-crystalline residue, having a purplish hue.

It might be supposed that on treatment with ammonia, phyllo-
cyanin would yield products similar to those formed by the action
of aniline, but this is not the case. When phyllocyanin is heated
with strong liquor ammoniz in a sealed tube to 140°, bodies are
formed which are similar to if not identical with those due to the
action of fixed alkalis.

Compounds of Phyllocyanin.—From what has been stated above, it
may be inferred that phyllocyanin plays the part of a weak base, that
is, it combines with strong acids, the compounds however being un-
stable, and easily decomposed even by water. Like other weak
bases, it may also act as an acid, though for reasons before men-
tioned, it may be doubted whether, in combining with bases, it does
so without undergoing change. Notwithstanding its nearly neutral
character, however, phyllocyanin is capable of yielding compounds of
great comparative stability, into which metals and acids, especially
organic acids, enter as constituents.

When phyllocyanin is dissolved in boiling glacial acetic acid, it

Contributions to the Chemistry of Chlorophyll. 30

erystallises out unchanged on the solution cooling. The same
happens when freshly precipitated cupric oxide or zinc oxide is added
to a boiling alcoholic solution of phyllocyanin; the solution deposits
phyllocyanin, and there are no indications of any combination taking
place between the phyllocyanin and the metallic oxide.

A very different effect is observed when either of the two oxides
is employed along with acetic acid. When cupric oxide is added to
a solution of phyllocyanin in boiling acetic acid, the solution acquires
at once a deep greenish-blue colour, and it no longer contains un-
combined phyllocyanin, for its spectrum is different, and on standing
it deposits lustrous crystals, which doubtless consist of a compound
of which phyliocyanin, acetic acid, and copper are essential con-
stituents. If zinc oxide be employed, a similar effect is observed ;
the liquid acquires an intense green colour, and now contains the
corresponding acetate of phyllocyanin and zinc.

The same phenomenon is seen when ferrous oxide, manganese
oxide, or silver oxide, or one of the corresponding acetates is
taken, solutions of various shades of green being obtained, which
contain phyllocyanin compounds, but no similar compounds are
formed when potassium, sodium, barium, calcium, magnesium,
or lead acetates are employed, for on adding the acetate of any
of the last-named metals to an acetic acid solution of phyllo-
eyanin, the colour of the latter remains unchanged, and phyllocyanin
is deposited, just as if no metallic acetate were present. Acetic
acid is, however, not the only acid which yields the reaction. If
palmitic, stearic, oleic, tartaric, citric, malic, or phosphoric acid be
employed, it takes place just as with acetic acid, but, in some cases,
time is required for its completion. The process results, there can be
little doubt, in the formation of compounds analogous to those with
acetic acid. ‘To obtain these compounds, it is only necessary to add a
little of the freshly precipitated metallic oxide, and an excess of one
of the acids named, to a solution of phyllocyanin in boiling alcohol,
keeping the solution boiling for several hours, then filtering and
adding water, in which the compounds are insoluble. The precipi-
tated compounds, which are generally of a bright green, are filtered
off and washed before treatment with reagents.

The following is an enumeration of the compounds obtained in the
way just described :—

Phyllocyanin cupric acetate.

ss », palmitate.
at » stearate.

me » Oleate.

43 » tartrate.

iY » citrate.

a »» phosphate.

308 Mr. E. Schunck.

Phylloecyanin argentic acetate.

ie zinc acetate.

" 5, palmitate.

4 », Stearate.

“ », Oleate.

55 » citrate.

ie ferrous acetate.

ie » palmitate.

aM » Oleate.

3 » citrate.

" » malate.

a 5» phosphate.
5 manganese acetate.

It would, of course, be easy to extend this list by taking a Bio ae
variety of acids and metallic oxides.

Nevertheless, strange to say, several compounds, the existence of
which might have been anticipated, are not formed under the same
conditions as those above enumerated. Phyllocyanin does not enter
into combination when its alcoholic solution is boiled with cupric
oxide and oxalic acid, zinc oxide and oxalic acid, zine oxide and
tartaric acid, ferrous oxide and tartaric acid. I could also see no in-
dication of double compounds of phyllocyanin hydrochloride with
the chlorides of platinum, mercury, or copper being formed, but on
the other hand, a double sulphate of phyllocyanin and copper seems
to exist. Attempts to form compounds by heating mixtures of
phylocyanin with glycerin and various fatty acids, at a temperature
of 130°, led to negative results.

The various compounds above enumerated have a number of pro-
perties in common, though the several classes differ, iter se, in some
important particulars.

They all dissolve more or less easily in alcohol, ether, chloroform,
benzol and carbon disulphide, in fact in all the solvents which take
up phyllocyanin and chlorophyll, but they are all insoluble in water,
with the exception of the phyllocyanin manganese acetate, which
dissolves readily therein. The solutions have a green colour, varying
from grass-green, like that of chlorophyll solutions, to a fine bluish-
green or blue, and they show peculiar spectra. The alcoholic solu-
tions remain quite unchanged when sulphuretted hydrogen is passed
through them, no precipitate is formed, and the solutions, on
evaporation, leave the various compounds with their original proper-
ties unchanged. It is only on incineration that the presence of the
metallic constituents is detected, the copper compounds leaving, after
being burnt, cupric oxide; the zinc compounds, zinc oxide, the iron
compounds, ferric oxide. Lastly, they are all soluble in dilute alkaline
lyes, and are again precipitated unchanged on the addition of acetic

Contributions to the Chemistry of Chlorophyll. 309

acid. These reactions make it somewhat doubtful whether these
compounds are to be considered as double salts in the ordinary accep-
tation, and whether the metallic constituents may not rather be con-
tained in them somewhat in the same way as the iron in hematin.

I have still a few remarks to make on the distinctive properties
characterising the three principal groups of these compounds, the
eupric, zinc, and ferrous groups.

Of:these, the cupric compounds are the most beautiful, and, at the
same time, the most stable. Their solutions show a brilliant colour,
inclining more to bluethan green, and spectra with four absorption
bands, the position of which varies somewhat according to the acid
employed. They are not decomposed by treatment with strong acids.
‘Tf an alcoholic solution of any one of them be mixed with a large
quantity of hydrochloric acid and boiled, the coleur isnot changed,
and on adding water, and then shaking up with ether, the ethereal
liquid which rises to the surface shows the same colour-and the same
‘spectrum as the original alcoholic solution. The phyllocyanin cupric
acetate is the most beautiful of the series. It is best prepared by
adding cuprie acetate to a-solution of phyllocyanin in boiling acetic
acid. The crystalline mass which separates out on standing is
filtered off, treated with dilute hydrochloric acid to remove any.
excess of cupric acetate that may ‘be present, and then redissolved in
glaeial acetic acid boiling. The solution on cooling deposits the
compound in erystalline scales, which are elongated, pointed at the
ends, of a pale greenish-blue by transmitted light, and of a brilliant
purple, with a -semi-metallic lustre, by reflected light; it much
resembles crystallised indigo-blue. The other cupric compounds
yield only microscopic crystals.

The zincic group of compounds yield solutions of a brilliant green,
showing spectra of five bands. These compounds are distinguished
from the preceding by their instability in the presence of strong acids.
Jf an alcoholic solution of any one of the zinc compounds be mixed
with hydrochloric acid:and boiled, its colour changes to blue. On now
adding water, the blue colour disappears, and a precipitate is formed
which on shaking up with ether dissolves. The ethereal solution
has the colour and shows the absorptiou spectrum of phyllocyanin
solutions. The zinc compounds are therefore decomposed by hydro-
chloric acid, yielding phyllocyanin again as one of the products of
decomposition.

The behaviour of phyllocyanin towards zine oxide in the pre-
sence of organic acids may serve to explain a peculiar phenomenon
first observed by Church* and subsequently described by Tschirch.
The former took chlorophyll that had become olive-brown on standing,
and, acting on it with zinc powder in the water-oven, obtained a body

* “Chemical News,” xxxviii, 168.

360 Mr. E. Schunck.

yielding bright green solutions, which he took to be regenerated
chlorophyll. Tschirch acted on Hoppe-Seyler’s chlorophyllan with
zinc powder, and observed the same phenomenon, the conclusion at
which he arrived being the same, viz., that chlorophyll is reproduced
from chlorophyllan by the reducing action of zinc. I think, however,
that what Tschirch obtained was, in reality, a zinc compound, and
would have been formed just as well by using zine oxide. Chloro-
phyllan is probably an impure substance, containing, it may be, some
fatty acid, together with phyllocyanin, so that by the action of zinc
oxide on the mixture a compound similar to those above described
may be formed.

I have tried the experiment with the peaintae produced by treat-
ing a chlorophyll solution with hydrochloric acid, which probably
differs very little from chlorophyllan, dissolving it in boiling alcohol,
adding zine oxide and boiling for some time, when a bright green
liquid was obtained, which might have been taken for a solution of
chlorophyll, but evidently contained a zinc compound of the same
character as those formed directly from phyllocyanin by a similar
process. The spectrum was identical with that of the zinc compounds
from phyllocyanin.

The ferrous group of compounds yield solutions of .a pure green,
like that of chlorophyll. They are not, however, strikingly fino-
rescent, and when exposed to sunlight in open vessels they retain
their colour unchanged for a long time. The group may be divided
into two sub-groups: :the first sub-group comprising compounds
into which one of the fatty acids—acetic, palmitic, or oleic acid—
enters as a constituent; the other sub-group, such as are formed by
the action of citric, malic, or phosphoric acid. The members of the
first sub-group show, in solution, the same-spectrum, consisting of
four ill-defined absorption bands, with much obscuration throughout.
To the other group belongs a spectrum consisting also of four bands,
which are, however, differently placed and more distinct than with
the first sub-group. If a small quantity of hydrochloric acid be
added to an alcoholic solution of any one of the iron compounds the
solution acquires a blue tint, and the bands are now found to have
shifted considerably towards the blue end. This effect may be due to
the removal of a portion of the iron, and the formation of compounds
with less iron. If a member of the second sub-group be taken, the
phosphate or the malate for instance, then on the addition of hydro-
chloric acid a spectrum is obtained which closely resembles the
ordinary chlorophyll spectrum as regards the number, position, and
relative strength of the bands. The members of the first sub-group
undergo a further change by treatment with an excess of hydro-
chloric acid and boiling, but the resulting product is not phyllo-
cyanin.

Contributions to the Chemistry of Chlorophyll. a61

All the members of the iron group of compounds undergo a peculiar
change by the action of ether. When the alcoholic solution of any
one of them is mixed with its own volume of ether, the green colour
oradually fades and gives place to yellow. All the bands except
that in the red disappear, while another fine band further in the red
makes its appearance. At length the two bands in the red also
vanish, and nothing is now seen but a considerable obscuration at the
blue end, due to the presence of a yellow colouring matter in solu-
tion. The change resembles that which is seen on exposure of a
chlorophyll solution to air and sunlight; it takes place, however,
quite as readily in a closely stoppered bottle, kept in the dark, as in
an open tube exposed to light. It is affected more rapidly by ordinary
methylated ether than by pure ether. Benzol and acetone act in the
same way as ether, but chloroform and carbon disulphide are without
effect.

The phyllocyanin manganese acetate, which is obtained by adding
manganese acetate to a solution of phyllocyanin in glacial acetic acid,
differs from the compounds previously described by its solubility in
water. It also dissolves easily in alcohol, but less readily in ether
and benzol. Its solutions are green, like those of the iron compounds,
and show a peculiar spectrum. It is not changed by treatment with
boiling hydrochloric acid, and its alcoholic solution remains unaltered
when mixed with ether or benzol.

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PAGE

I. On the Fertilised Ovum and Formation of the Layers of the South
African Peripatus. By Apam Sep@wicx, M.A., Fellow of Trinity
College, Cambridge . : : : : : ; . : aor

II. On the Formation of the Mesoblast, and the Persistence of the Blasto-
pore in the Lamprey. By ArtHuR EH. Suiptry, B.A. . : - 244
TIT. Researches on Myohxmatin and the Histohematins. By C. A. |
MacMounn, M.A.,M.D. . : : , 5 : A , . 248
IV. On the Geometrical Construction of the Cell of the Honey Bee. By
‘Henry Hennessy, F.R.S., Professor of Mathematics in the Royal
Coliege of Science, Dublin : Pei ene : aa pene : . 253
V. Results deduced from the Measures of Terrestrial Magnetic Force in
the Horizontal Plane at the Royal Observatory, Greenwich, from 1841 eat
to 1876. By Sir G. B. Arry, K.C.B., F.R.S., late Astronomer Royal 255

VI. Studies of Disinfectants by New Methods. By A. Wynter BuiyTH,
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Contributions to the Chemistry of Chlorophyll. By Epwarp Scuuncx,F.R.S. 348

Obituary Notice :—

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CONTENTS. 1M
December 10, 1885.

I. Preliminary Results of a Comparison of certain simultaneous Fluctuations
of the Declination at Kew and at Stonyhurst during the Years 1883 and

1884, as recorded by the Magnetographs at these Observatories. By

the Rev. SrEPHEN JOSEPH PrERRY, F.R.S., Director of the Stonyhurst
Observatory, and Batrour Stewart, LL.D., F.R.S., Professor of
Physics at the Owens Coliege, Manchester :

II. On the Magnetisation of Steel, Cast Iron, and Soft Iron (being the
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III. On the Limited Hydration of Ammonium Carbamate. By H. J. H.
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Contributions to the Chemistry of Chlorophyll. “361

All the members of the iron group of compounds undergo a peculiar
change by the action of ether. When the alcoholic solution of any
one of them is mixed with its own volume of ether, the green colour
gradually fades and gives place to yellow. All the bands except
that in the red disappear, while another fine band further in the red
makes its appearance. At length the two bands in the red also
vanish, and nothing is now seen but a considerable obscuration at the
blue end, due to the presence of a yellow colouring matter in solu-
tion. The change resembles that which is seen on exposure of a
chlorophyll solution to air and sunlight; it takes place, however,
quite as readily in a closely stoppered bottle, kept in the dark, as in
an open tube exposed to light. It is effected more rapidly by ordinary
methylated ether than by pure ether. Benzol and acetone act in the
same way as ether, but chloroform and carbon disulphide are without
effect.

The phyllocyanin manganese acetate, which is obtained by adding
manganese acetate to a solution of phyllocyanin in glacial acetic acid,
differs from the compounds previously described by its solubility in
water. It also dissolves easily in alcohol, but less readily in ether
and benzol. Its solutions are green, like those of the iron compounds,
and show a peculiar spectrum. It is not changed by treatment with
boiling hydrochloric acid, and its alcoholic solution remains unaltered
when mixed with ether or benzol.

VOI. &EKIX. DR

362 Rev. 8. J. Perry and Prof. Balfour Stewart. [Dee. 10,

December 10, 1885.
Professor G. G. STOKES, D.C.L., President, in the Chair.

The Presents received were laid on the table and thanks ordered for
them.

The President announced that he had appointed as Vice-Presi-
dents—
The Treasurer.
Dr. Archibald Geikie.
Sir Joseph Hooker.
Professor Huxley.
General Strachey..

Dr. John Anderson (elected 1879) was admitted into the Society.

Pursuant to notice, Professors Adolf Baeyer, Felix Klein, A.
KXowalewski, and Sven Lovén were balloted for and elected Foreign
Members of the Society.

The following Papers were read uae

I, * Preliminary Results of a Comparison of certain simultaneous
Fluctuations of the Declination at Kew and at Stonyhurst
during the Years 1883 and 1884, as recorded by the
Magnetographs at these Observatories.” By the Rey.
STEPHEN JOSEPH Perry, F.R.S., Director. of the Stony-
hurst Observatory, and BALFOUR STEWART, LL.D., F.R.S,,
Professor of Physics at the Owens College, Maricheees
Received October 31, 1885.

From a comparison made by Messrs. Sidgreaves and Stewart
(“ Proc. Roy. Soc.,” October, 1868), between a few prominent simul-
_ taneous changes of declination at Kew and at Stonyhurst, it appeared
that the ratio between the magnitudes of such changes was not con-
stant, but depended to some extent upon the abruptness of the dis-
turbance. |

With the view of examining into this matter, we have made a
somewhat more detailed comparison, selecting for this purpose some

1885.| Fluctuations of Declination at Kew aud Stonyhurst. 363

of the best marked fluctuations during the years 1883 and 1884, both
large and small, abrupt and non-abrupt.

There are two ways in which such a comparison may be made, the
first of these being to measure the vertical difference in the declina-
tion curve between the two turning points of a fluctuation. This is
the method which we have pursued in this investigation. It is, how-
ever, subject to the objection that the course of the curve between
two such points is not precisely a straight line, and hence that this
course embraces different values of abruptness.

On the whole, however, this method as we have used it appears to
us to lead to definite, and we think not inaccurate, resuits. The
other method would be to compare together the simultaneous rates of
change of the declination at the two observatories, selecting for this
purpose such portions of the records as present the appearance of
constant slope, that is to say are straight lines.

This method we have not hitherto pursued, but it is possible that
we may do so, and compare it with the other in a contemplated
future research.

It is unnecessary to give a description of the magnetographs at the
two observatories, suffice it to say that both declination magnets are
as nearly as possible of the same size and weight, being about
5°5 inches long, 0°8 inch broad, and 0:1 inch thick.

The scale of the arrangement is, however, different at the two
observatories in such a manner that at Kew 1 mm. of scale = 0°87’,
while at Stonyhurst 1 mm. of scale = 1:13’. It would thus appear
that equal vertical curve-differences at Kew and at Stonyhurst are to
each other very nearly in the proportion of 1 to 1:3. This is the
proportion which we shall use in the present paper.

For the Kew results, we are indebted to the kindness of the Kew
Committee ; of Mr. Whipple, Superintendent of the Kew Observatory ;
and of Mr. Baker, the magnetical assistant there.

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Rev. S. J. Perry and Prof. Balfour Stewart.

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1885.] Fluctuations of Declination at Kew and Stonyhurst. 369

We do not know of a single instance in which the fluctuation is not
in the same direction at both observatories.

We have given the G.M.T. of the commencement and end of each
fluctuation at each observatory. Practically speaking, the times at
both places are so nearly simultaneous that we do not feel justified in
asserting that they are not quite so. Occasionally, however, there
are indications that certain short period fluctuations are not precisely
of the same duration at both places. In what follows we have
rejected such cases; also we have adopted the durations as recorded
at the Kew Observatory, rejecting however all cases when these are
less than five minutes, inasmuch as an accurate measure of duration
is essential to our method.

Let us now, simply as a conjecture which may be of service in
indicating the best method of treating the observations of Table I,
suppose that in these disturbances two causes are in operation, and
that the result is due partly to true magnetic changes, and in part to
secondary currents caused by these changes.

Let K denote the whole observed value of the disturbance at Kew,
and of this let & denote the portion due to strictly magnetic change,
also let akf(t) be the portion of the whole disturbance caused by
secondary action, « being a constant which may conceivably be either
positive or negative, and ¢ denoting the duration. Hence K =
k(1+a@(t)). In like manner let S denote the whole Stonyhurst
change.

We are, perhaps, justified in putting S = &(S + y(t)), Band +
being constants.

Hence we shall have 8 aes
K 1l+e9(t)

function of the duration.

that is to say, s will be a

It thus appears that the value of © will, according to this or indeed

according to any probable hypothesis of this nature, be independent
of the values of S and K, and be a simple function of the duration.
These reasons have induced us to construct the following table (II),

in which the ratio alk ascertained for disturbances of varying dura-

tions.

[ Dee. 10,

Rey. 8. J. Perry and Prof. Balfour Stewart.

310

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371

1885.] Pluctuations of Declination at Kew and Stonyhurst.

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372 Rev. 8. J. Perry and Prof. Balfour Stewart. [Dee. 10,

Table IT will explain itself. In it we have embodied the various
individual observations of Table I, with the following exceptions :—

On account of apparently On account of the duration
unequal duration. being under five minutes.
No. 3 NLA erat Soe No. 10
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From Table 11 we may deduce the following conclusions :—

(1.) In the very great majority of cases the angular value of the decli-
nation disturbance is greater for Stonyhurst than for Kew.

(2.) The ratio Pie certainly greater for disturbances of short than for

those of long duration. Our observations are not, however, sufji-
ciently extensive to enable us to represent this ratio graphically as
a function of the duration.

(3.) As far as we can tell from a limited number of observations the
value of the above ratio does not depend on the magnitude of the
disturbance.

We trust to make on a future occasion a more complete comparison
between the simultaneous magnetic fluctuations as derived from the
curves of the two observatories.

Nore.—It might be desirable to add a few words in fuller explanation of the
method adopted.

This method is founded on the implied belief that disturbances are indications of
the way in which the magnetic earth rights itself with regard to the forces acting
upon it. Our experience is that such disturbances never occur singly, but very
frequently as couplets or sets of couplets. There is no such thing as a magnetic
tableland separated from another by a single slope. We have rather a rise and
then a fall, or it may be a fall and then a rise, and in the end the state of things,
after the disturbance has run its course, is not greatly different from that before it
began. ‘This duality, as well as the results of this paper, would lead us to imagine

1885.] Fluctuations of Declination at Kew and Stonyhurst. 373

that secondary currents must have an influence, perhaps a powerful one, in causing

disturbances.

In order to fix the mind, let us here imagine that this secondary current influence
(exhibited probably in the shape of an earth current) is opposed in direction to the
true magnetic change. We should, therefore, expect something of the following

nature.

ED or E’D’=magnetic change, first movement.
DF or D’F’= magnetic change, second movement.

DC-or pic’ = 2.

In the first of these diagrams AB denotes a true magnetic descending change,
while ACB is the observed disturbance couplet. In the second A’B’ denotes a
true magnetic ascending change, while A’C’B’ is the observed disturbance couplet.

In our various measurements, therefore, it is assumed that we pass from a point.
of no disturbance, A or A’, to another, C or O’, in which there is a magnetic change
and a superposed secondary current change, or from a point in which these two
forces act to a final point, B or B’, of no disturbance. Now the maximum earth
current force will depend upon the maximum rate of magnetic change. This maxi-
mum rate we cannot tell, but we may imagine it to be proportional to the mean
rate of magnetic change, being possibly represented in an approximate manner by
the expression—
magnetic change

duration
functions of the text would be replaced by the expressions (taking both branches of

Max. current force = a constant x . Inother words, ourgeneral

the eurve) —
K =k ( 1+)
t

$= (9 +1)

It would appear from this as well as from the diagrams that the first turn of a

couplet should be less than the second.
The results in our paper cannot, therefore, be regarded as a final analysis, but
merely as being of sufficient interest to demand a fuller inquiry.—November 4th.

1885.

374 | Mr. J. W. Gemmell. [Dec. 10,

II. “On the Magnetisation of Steel, Cast Iron, and Soft Iron”
(being the investigation for which the Watt Prize of 1884
was awarded by the Senate of the University of Glasgow).
By Joun W. GEMMELL. Communicated by Sia WILLIAM
THomsoy, Kt., LL.D., F.R.S. Received October 31, 1885.

The experiments, of which the following is a description, with their
results, were performed in the Physical Laboratory of the University
of Glasgow, and had for their object the finding of the difference
between specimens of iron and of steel with respect to the intensities
of their total and residual magnetisation due to different degrees of
magnetising force.

The specimens consisted of (1) wires of ‘soft Scotch” iron, of
“common wire,” of ‘‘ charcoal iron,” and of “‘ soft steel;’ and (2) bars
of cast iron and of malleable iron. The wires were 31 cm. long and
0-5 cm. in diameter, and weighed respectively 39°85, 39°9, 41°5, and
38°5 grams. The bars, two of which were cf cast iron procured from
different foundries, were 15°25 cm. long, and of section 1 em. square.
The cast iron bars Wena. each 114 grams, and the malleable iron bar
125 grams.

The arrangement of the apparatus employed i in the investigation is
shown in the accompanying diagram (fig. 1). The magnetising coil,

inn

TRAY DANIELLS

represented at C, was 40 cm. in length, and consisted of three layers
of 600 turns each of silk-covered copper wire, wound on a brass tube
of the same internal diameter as the wires. It was placed on a con-
venient stand with its axis horizontal and at right angles to the mag-
netic meridian. For.the experiments on the bars the coil was 21 cm.
in length, and consisted of five layers of 155 turns each of insulated

1885.] Magnetisution of Steel, Cast Iron, and Soft Iron. 375

copper wire wound on a copper case of square section just fitting the
bars.

The magnetising current passing through the coil was obtained from
a battery of Thomson’s tray Daniells, by means of which any desired
current above 0°25 of an ampére could be employed. To obtain cur-
rents ranging from 0 tothe minimum (0°25) to be got by the battery, a
resistance-box, capable of inserting any resistance up to 10,000 ohms,
was placed in the circuit with a single cell.

The strength of the current was measured by one of Sir William
Thomson’s graded galvanometers, represented at G, a full description
of which will be found in Mr. Andrew Gray’s “ Absolute Measure-
ments in Hlectricity and Magnetism.”

A reflecting magnetometer, M, of the well-known form devised by
Mr. J. T. Bottomley, was used to measure the intensity of magnetisa-
tion. . In the experiments on the wires it was placed due magnetic
east of the coil, at a distance of 1 metre from the middle point of its
axis, and in such a position that if the axis were produced it woald
pass through the centre of the mirror. In the experiments on the
bars its position was due magnetic north of the coil.

A framework, holding a lamp L, and having a scale 8 of half-
millimetre divisions attached to it, was placed in front of the mag-
netometer at such a distance that the scale was exactly 1 metre from
the magnetometer needle. The light from the lamp, passing through
a tube T in front, in which a fine wire is vertically fixed, is reflected
from the mirror to the scale, and the deflection read by the image of
the fine wire in the middle of the spot of light.

The results in these experiments were got by beginning with a
feeble magnetising current, which was increased step by step until the
maximum obtainable was reached. It was then gradually diminished
to zero, when the direction of the current was reversed, and the same
process of increasing and diminishing repeated.

The magnetometer readings taken while the current is flowing repre-
sent the effect upon the magnetometer needle of the joint electromag-
netic action of the current passing through the coil, and the magneti-
sation it produces in the wire or bar. Hence the effect due to the
magnetisation of the wire or bar alone is obtained by subtracting from
the total effect the magnetic effect of the coil. This last is propor-
tional to the current flowing, and was found by experiment to be for
the “wire” coil 0'0385, and for the “ bar” coil 0°0326 of a division
of the magnetometer scale per division of the galvanometer scale.

The results of the investigation are shown in the accompanying
curves. The abscisse are divisions of the galvanometer scale, and are
therefore proportional to the magnetising forces. The ordinates are
divisions of the magnetometer scale, and are therefore proportional

to the mtagnetisation produced. The curves marked A represent the

376 | Mr. J. W. Gemmell. a [Deck aas

total, and those marked B the residual magnetisation. Beginning at
zero, we pass to the right, gradually increasing the magnetising force
until we reach our limit. Then returning, we pass through zero, and
with the opposite magnetising force proceed to the left limit, from
which we again return to zero.

The first experiments were made upon the wires, the results of
which are given in Curves I, II, II], and IV. These wires were after-
wards annealed and retested, with the results shown in Curves V to
VIII inclusive. The remaining Curves IX, X, and XI, contain the
results obtained from the bars.

The results given by the curves may be reduced to absolute measure
by means of the figures on each, which were obtained in the following
manner :—

et

H = the horizontal component of the earth’s magnetic iorce.

M = the magnetic moment of the wire or bar.

m = the magnetic moment of the magnetometer needle.

KF = the strength of a pole of the wire or bar.

f = the strength of a pole of the needle.

y = the distance of the centre of the wire or bar from that of
the needle.

a = half the distance between the poles of the wire or bar.

b = half the distance between the poles of the magnetometer
needle.

0 = the angle of deflection of the magnetometer needle.

The position of the wire, with regard to the magnetometer in the
experiments on the wires, is shown in fig. 2.

> CZZUE SSSI

The pole N of the wire attracts the pole s of the needle with

a force

F;
= b being so small in comparison with 7 that the poles of the

and the pole S repels the pole s with a force

re

1885.] Magnetisation of Steel, Cast Iron, and Soft Iron. 3t7

needle may be regarded as at its centre c. Hence the total attractive
force exerted on the pole s is—

Aar

1 1
Ry { Ga GE or BY cary that is hee

=a
We find similarly that the pole N exerts an equal repulsive force
on the pole n. The needle is therefore acted on by a “ couple ”—

a — €os 0. phabas == eer cos 0.

(72 a*)? (x py atta (2 —a?)?

To balance this we have another “couple,” fH.2bsin @, that is,
mH sin 6. Hence, equating these two couples, we get—

(eoemenmetemce, . . . - « (ls)

The value of H at this point was found to be 0°16, by comparison
with a particular spot in the laboratory, for which, by the method
fully described in Mr. Thomas Gray’s paper on “The Experimental
Determination of Magnetic Moments in Absolute Measure”’ (“ Philo-
sophical Magazine,’ November, 1878), the value of H had already
been very accurately determined. Half the distance between the
poles of the wire, represented by a, may be taken as half its length,
that is, 15°55 cm. The angle through which the magnetometer
needle is deflected is measured on the half-millimetre scale; and for
small angles tan @ = $ tan 20; so tan@ is got by dividing the scale
reading by 2r in half-millimetres, that is by 4000. By substituting
these values in equation (1), we find that the magnetic moments are
obtained by multiplying the readings of the magnetometer scale,
which in the curves are represented by the ordinates, by the factor
19°110125. The magnetic moments per gram are therefore got by
multiplying the ordinates in—

Curves ITand V by 0°4795.
De Groae WWE Orzo)
VL eV LE, 04605:
EV a VEEP, 0) 4964:

The position of the bar with regard to the magnetometer in the
experiments on the bars, is shown on fig. 3.

The pole N of the bar attracts the pole s of the needle with a force
oe » and the pole S repels the pole s with an equal force. The
VOL. XXXIX. 2c

378 al Mr. J. W. Gemmell. | [Dec. 10,

resultant of these two forces is a force R, parallel to the bar, and of

value aE par * that is foe

Fia. 3.

A'force, equal and parallel to this, but in the opposite direction,
may be similarly shown to act on the pole of the needle. Thus the
needle is acted on by a “ couple,” the value of which is—

cos @.

2bf/—_— cos 0, that is a :
Ge zy, (7 +a*)#
To balance this “‘ couple”? we have, as before, another ‘‘ couple,”
mH sin'@. Hence, equating these, we get—

M=(7?+o?)?Htan6, °. . . =. Sees

Now, in these experiments, r is 100 cm., a 76 cm., and H was
found to be 07155. Substituting these values in equation (2), we
Bi: R2=2/ Hy Ji (1—cosSsN); but cosSsN =cos? 1GsN—sin4SsN="—
re+a 7 a=
Ef a M
J je) 7 SET ee ee et
m+a° VJ 4 ge Ts

; hence

1885.) Magnetisation of Steel, Cast Iron, and Soft Iron. 379

‘find that the magnetic moments of the bars are got by multiplying
the ordinates by 41°085378. Therefore, to get their magnetic
moments per gram, we have to multiply the ordinates of IX and X
by 0°3604, and those of XI by 0°3287.

The magnetising force is evaluated by the equation—

Ta oe eae CS)

where 7 is the number of turns of wire in the coil per centimetre
of its length, and C the current strength in c.g.s. units passing
through it.

The abscisse of the curves are scale divisions of the galvanometer,
with its magnetometer at the platform division 32, or the readings at
other divisions reduced to those of this division. Thus the abscissse

7 =: 5 represent the currents in absolute measure.
The magnetising force F is therefore obtained from the curves by

multiplied by

Jel H
a907 Of 7" a" In the first eight

experiments, n=45, and H=0:16; thus we have 0°2828 as the factor
for reducing the abscisse of the curves I to VIII inclusive. The
abscisse of curves [X, X, and XI are reduced by the factor 0°224,
n being 37, and H 0°16.

From a comparison of the curves Nos. I to IV inclusive, it will be
seen that the “charcoal iron” has the highest magnetisability, and
the ‘‘ soft steel’ the lowest, while that of the ‘‘soft Scotch iron ”’
approaches very near to the former. With regard to retentiveness,
the ‘‘charcoal iron” shows the least, and the ‘soft steel” the
greatest.

Passing on to curves V to VIII inclusive, we find that the general
effect of annealing the wires has been to lower their retentiveness,
and to raise their magnetisability for all forces. In the “soft Scotch
iron”’ wire little difference has been made; but in the others the
effect is very marked, and is most noticeable in the “charcoal iron”
wire with respect to its magnetisability, and in the case of the “ soft
steel”’ wire with respect to its retentiveness. Comparing the results
of these eight experiments then, we find that the specimen which has
the highest magnetisability, and at the same time the lowest reten-
tiveness, is the annealed “charcoal iron” (7). Coming next to this
specimen, in both respects we have the ‘“‘ charcoal iron” wire (3), and
the annealed “common wire’’ (6), between which there is little or
no difference. The ‘soft steel’’ wire is the lowest of all in respect of
magnetisability, and highest in retentiveness. Annealing it, however
(8), has had the effect of bringing it very close to the ‘common
wire”’ (2).

As regards the bars, the second specimen of cast iron is greatly

2c 2

multiplying the abscisse by 47n

380 Mr. J. W. Gemmell. [Dee. 10,

inferior to the first in respect of magnetisability. The malleable iron
bar exhibits a very much higher magnetisability than the cast iron
bars; and its residual magnetisation was so low that it could not gee
observed with the same arrangement of apparatus.

- These are the main points in a comparison of the results of the
experiments. A study of the curves, however, reveals many points
of interest, one or two of which I may here indicate.

The curve beginning from the zero of magnetisation was not obtained
in all the experiments, the wires having been previously magnetised
in a preliminary test; but in those cases in which the smallest mag-
netising forces were employed, the curve of results is seen to be for
_a short distance concave towards OY.

Returning again to the small magnetising forces after having pro-
ceeded to the limit, we find the curve first becoming concave towards
OY, and then convex just before it crosses that line. On the negative
side of OY, it remains concave for but a short distance, and is convex |
when it crosses the line of zero magnetisation, remaining so both in
the direct and the return curves until we again near the zero of
magnetising force, when it becomes concave for a short distance up
to zero. To show these points clearly, the central portion on an
enlarged scale has been affixed to each set of curves.

Turning to the curves for the residual magnetisation, an interesting
point at once presents itself. This is a loop between the direct and
return curves, more or less marked in most of the diagrams, but best
seen in No. IV. A similar loop is seen in the curves of total magnet-
isation in Nos. V and VII, and there seems to be a tendency to form
such a loop in all these curves. Regarding that part of the positive
return curve which represents the effects of the small magnetising
forces, we see that the residual magnetisation first begins to take a
greater value, and then diminishes again just before the zero of
magnetising force is reached. 7

I shall defer any discussion of these anomalies until I have made a
further observation of them under conditions more suitable for their
special investigation.

1885.] Magnetisation of Steel, Cast Iron, and Soft Iron.

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386 | Mr. H. J. Hy Fenton: [Dec. 10,

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IIT. “On the Limited Hydration of Ammonium Carbamate.”
By H. J. H. Fenton, M.A, F.C.S., F.1.C., Demonstrator
in Chemistry in the Taree of Cae Communi-
cated by Dr. Hugo Muuuer, F.R.S.. Received November
19, 1885.

It occurred to me that a study of the action of water on ammonium
carbamate, with reference to the influence of time, mass, and tempera-
ture, would be of interest as tending to throw light upon the laws
which govern a chemical action of the simplest type in the liquid state
—the action consisting of the direct union of two simpler molecules
to form one more complex—

CO(NH,) (ONH,) + OH,=CO(ONH,),,

There are but few such actions which can be investigated, where all
the substances are in the liquid state and all extraneous matter
absent.

In a paper read before the Chemical Society in 1879,* I showed that
ammonium carbamate when acted upon by sodium hypochlorite in

* “ Chem. Soc. Jour.,” 35, 12.

1885.] Limited Hydration of Ammonium Carbamate. 387

presence of sodium hydroxide, yields one-half of its nitrogen in the
free state, the other half remaining in the form of sodium carbamate—

2CO(NH;) (ONH,) + 3NaCl0 +2NaOH=2C0(NH,)(ONa)+3NaCl
+50H,+N,.

Sodium hypobromite at once decomposes sodium carbamate, evolving
its nitrogen in the free state—

2CO(NH,) (ONa) + 3NaBrO + 2NaOH=2CO(ONa), + 3NaBr
+3H,O + No. |

This, in fact, may be claimed as a specific reaction for carbamates—
no other substance yet investigated will yield nitrogen when treated
with a hypobromite after the completed action of a hypochlorite.
Urea evolves but half its nitrogen with a hypochlorite, in presence of
caustic alkali, but the other half remains as a cyanate, which is not
acted upon by a hypobromite.*

Based upon this reaction, then, we have a direct and simple method
of determining the amount of carbamate existing in a solution at any
given time.

Since, under the action of a hypochlorite, ammonium carbamate
yields one-half of its nitrogen (1.e., that present as ammonium), it is
evident that any excess over aed above this half which is evolved
from its solution, is a measure of the water which has been assimilated
converting the carbamate into carbonate.

For the sake of convenience we may express the hydration which
occurs in terms of the ratio of the number of molecules of water
assimilated to that of the molecules of ammonium carbamate taken.
Let V = the total volume of nitrogen contained in the ammonium
carbamate taken, and V, = that evolved by the action of a hypochlo-
2V,—V

Vv

rite on its solution. Then the above ratio evidently =

(since one atom of nitrogen evolved in excess of the half total corre-
sponds to one molecule of water assimilated, and two atoms of nitrogen
ae ae present represent one molecule of ammonium carbamate
taken).

The ammonium carbamate used in these experiments was prepared
by the direct union of carefully dried ammonia and carbon dioxide.
The apparatus employed in the estimation of the evolved nitrogen
was similar to that described in a former paper on the action of
Hypochlorites in Urea.*

Experiments were undertaken with a view of investigating to what
extent the action is influenced’ by (1) time, (2) mass, (3) tempera-
ture, and (4) to study the reverse action, namely, the dehydration of
normal ammonium carbonate into ammonium carbamate.

| * “Chem. Soc. Jour.,”’ 33, 300.

388 Mr. H.J.H.Fenton. = * ~ [Dee 10,

I. Influence of Time.

Weighed quantities of ammonium carbamate were dissolved in
water and the solutions made up to a definite volume. Measured
portions were then withdrawn and examined at stated intervals by
treatment with sodium hypochlorite and sodium hydroxide, care being
taken to employ approximately the same quantities of reagents for
each experiment of the series. The times were reckoned see! the
moments of complete solution of the salt.

62873 grams ammonium carbamate were dissolved in water—the
solution made up to 100 c.c. and 5c¢.c. (corresponding to 0°31437 gram
of carbamate) taken for each experiment. Theory for total nitrogen
= 90°20 c.c. }

c.c. of Nitrogen

Minutes. Intervals. (corrected). Hydration.
Ou ire en ner Arabtec teen O4°16)- Sa 0 -2008
0) aS eae Ort ee ee bet FOOL eae 0°2575
BOTH Aen ANH a0 fete Were 60 O7 Ce Bee 0 °3386
AQ). ee eee Bi rewiaatias 66 04% % cee 0 4.644
OOS) Ferre Oe ae 68-60 tee ee 0°5211
LOO Paes Owe pe wists 3 Cp ie: eee 0 5842
BAO" HC Ae DAR Ee Rea (2°08 > 20 ee 0 5983
LOOM ere 5 YA ie ae (2° 2 O ee 0 °6125

After a further interval of about 24 hours, 72°28 c.c. of nitrogen
were evolved. Similar experiments were made with a weaker solu-
tion, namely, one containing 48781 grams of ammonium carbamate
in 250 c.c.; 10 c.c. were taken for each determination, corresponding
to 0°1951 gram of carbamate, and to a total of 55°98 c.c. of nitrogen.

c.c. of Nitrogen.

Minutes. Intervals. (corrected). | Hydration.
ON ad ey Ae Ea BOO") Ete ter 0° 2536

DON ee sae ka Drie ctae wee Co ae [PAE A Aone Bt 0° 3833
AU eee Ae Pe tc dana apa CNOA) lias A oll Aad 0 4615
AQ) iatas nies BF isniniaatens AS 20) casts sie 0°5434
BOM Cee G rr Es ae ects AS OURS LTE a 0°6327
120" Noe Be DAN URNS creeks AT AGP OE es soo OM OIGH
a Lied See BAS ATOLLS cantly Mar rine ae pote = 0 °6995

After about 24 hours 47:96 c.c. of nitrogen were obtained.

It is evident from these results that the action, which proceeds
rapidly at first, becomes progressively slower, and finally reaches a
limit short of complete hydration.

The time required to reach a determinate state of hydration! is
evidently greater for a strong solution than a weak one, 7.e., decreases
as the relative number of water molecules increases.

1885.] Limited Hydration of Ammonium Carbamate. 389

II. Influence of Mass.

83272 grams of ammonium carbamate were dissolved in water and
the solution made up to 100 cc. (Solution A.)

25 c.c. of solution A were made up to 50 c.c. (Solution B.)

25 c.c. of solution A were made up to 250 c.c. (Solution’C.)

The relative strengths were therefore A: B: C:: 1:4: 44.

_ The solutions were set aside for four days in carefully stoppered
flasks and under similar conditions. Volumes of each solution which
corresponded to equal masses of ammonium carbamate were then
withdrawn—namely, 5 c.c. of A, 10 c.c. of B, and 50 c.c. of C, repre-
senting 0°41636 gram of carbamate—and examined by the hypochlo-
rite method in the usual way.

5c.c. of A gave 95°73 c.c. N (corr.).
LOD eae nian a 09209 A
BOR is ny Cue. LLO)60 rr

In order to be certain that the equilibrium state had been arrived
at, the same solutions were again examined after a further interval of
two days, when :
5 c.c. of A gave 95°35 c.c. N (corr.).
JU stare Tel Bel ee tee S18) 5
DOr iy Gon so LO ces 5

showing that the limits had been reached in the former experiments.
These numbers correspond to the hydrations—

HARE YA ats nace tes, Oe 0 5963
IS EPEPS SLUGS ak eat cies 0 6735
Crh Seeman ane tts 0° 8550

In order further to confirm these results, the residues from the last
experiments, after the completed action of the hypochlorite, were
treated with sodium hypobromite in order to estimate the nitrogen
remaining as carbamate.

Residue from A gave 22:02 c.c. N (corr.).

99 9? B 99 17 ‘00 99
339 99 C 99 8 ‘Ol 9
making the totals—
Jes ei eR Sn ee 117 ‘37 c.c. N (corr.).
AWN asa A ih ted LEG 46%. 25) fy
Os ee reien dra nice, a aren 118-84 ¥,

theory for 0°41636 gram ammonium carbamate requiring 119°46 c.c.
There is always a loss of about 8 per cent. of nitrogen in estimations

390 Mr. H. J. H. Fenton. — [Dec. 10,

with hypobromite* : if this correction be applied the agreement will
be still closer. ,

In order to facilitate the interpretation of the results, further
experiments were made in the same direction, using mixtures of
carbamate and water in simple ratios of their molecular weights.

OF > 4 1 10k
carbamate. water.

(a) 0°3270 gram am. carb. with 15°09 grams water, correspondingto 1 : 200

(b) 0°1836 ~—,, jini aaa ‘ i 14 800
(ec) 0°1307 ii i 12-06 ¥ € 1 : 400
(d) 0-1042 ae a0? eg a 1 00

After standing for some days under similar conditions the following
results were obtained :— 7

c.c. of N (corr.) Theory for total

obtained. nitrogen. ‘Hydration.
(3) Reha Na Be OF 02) ae ee. ISSU ieee 0: 7487
(By ae ere Minos 52°66) soem 0 -7962
Cay hae: SUB 7 eee. 87 Aor Aan 0 8447
(eee 28 62) eee 29°89... 09156

Another experiment was made in which the ratio of the molecular
weights was nearly 1: 1, namely, 0°2614 gram ammonium carbamate
with 0:0632 gram water. After standing for two days, 49°52 c.c.
nitrogen (corr.) were obtained—theory for total nitrogen requiring
750 c.c. The hydration was therefore 0°3187.

It follows from the above results that the hydration is a function of
the number of water molecules present. So far the minimum hydra- —
tion corresponds to tne case in which the substances are present in
about equal molecular proportions, and is in this respect analogous to
the combination of iodine with hydrogen} and of phosphorus trichlo-
ride with chlorine.f{ From analogy it was to be expected that the
hydration would again increase as the ratio of the ammonium carba-
mate molecules to those of water increased; but the experiment
cannot be made under the same conditions as shee above, since with
any appreciable excess of the carbamate the water is insufficient to
completely moisten the solid.

III. Influence of Temperature.

The above results may be taken as representing the phenomena
which occur at about 20—22° C., from which the temperature varied
but little throughout the experiments.

* Russell and West, “Chem. Soc. Jour.,” 27, 749.

+ Lemoine: ‘‘ Equilibres Chimiques entre PHydrogéne et l’Iode Ganenee
“Ann. Chem. Phys.” [5], xii, 145.

t Wurtz, “Comptes Rendus,” lxxvi, 602.

1885.] Limited Hydration of Ammonium Carbamate. 391

In order to gain some idea as to the effect which temperature
might have upon the action, two equal volumes of an arbitrary solu-
‘tion of ammonium carbamate were taken and. kept in sealed vessels,
one at the temperature of the room—about 15° C., and the other in
melting ice. After about five hours the solutions were examined by
the hypochlorite method, taking care to keep the apparatus in each
case as nearly as possible at the respective temperatures.

Solution at 0° C. gave 68°0 cc. N (corr.).
99 15 99 19° 4 99

Similar pairs of experiments were made with another solution at
stated intervals, equal volumes being measured out in the first
instance and then subjected to the respective temperatures in sealed
vessels.

After 30 minutes solution at 0° gave 63 °7 c.c., solution at 15° gave 76 °2

2) uk nour 3 73:0 3 a * 83:2
” 2 hours ” ” 74°0 ” ” 88 °9
” 4, ” ” ” 76°3 ” 9 90°6

The hydration is therefore, in all cases, less at the lower tempera-
ture. ,

The minimum hydration will probably occur at a sufficiently low
temperature, and when the substances are present in equal molecular
proportions. A mixture was made of 0°6199 gram ammonium car-
bamate with 0°1424 gram of water—corresponding almost exactly to
equal molecular weights. This mixture was kept in a sealed tube
placed in a block of ice for 18 hours, when it may be safely assumed
that the equilibrium state was arrived at. It was then examined by
the hypochlorite method (the apparatus being kept at about 0° C.
throughout), and yielded 95:90 c.c. of nitrogen (corrected). Theory
for total nitrogen requires 177'1 c.c., so that the hydration is repre-
sented by 0°0830.

Probably, at a sufficiently low temperature, the hydration would be
practically nil, when the substances are present in molecular pro-
portions—.e., ammonium carbamate and water would practically not
combine at all—resembling the cases of phosphorus trichloride and
chlorine, &c., at sufficiently high temperatures.

IV. Dehydration of Normal Ammonium Carbonate.

The salt was prepared by the method of Divers.* About 5—6 grams
of it were dissolved in water, and the solution made up to 100 e.c. (A).
Portions of this solution were diluted to $ (B) and 1, (C). After
two days—

* “ Chem. Soc. Jour.,”’ 23, 179.

392 Mr. H. J. H. Fenton. [Dec. 10,

5 c.c. of A gave 35°54 ¢.c. N (corr.)
10) 3 iste Bred ee eo -
50 9 C ” 40°85 99

Equal volumes of another solution were examined at intervals, with
the following results :—

1S)

After 5 minutes 67°94 c.c. N (corr.) were evolved.
» 40 re) 66°73 9 ”
- ,, about 3 hours 62°52 Ms 3
24, 62°28 ”

99 39

These results indicate that normal ammonium carbonate undergoes
dehydration into carbamate when in solution, and that the dehydra-
tion is greater as the relative number of water molecules is less.

The instability of normal ammonium carbonate, and the difficulty
of obtaining it free from adhering impurities has, for the present,
prevented me from making more extended observations on this part
of the subject. It seems not unlikely, that if the same relative
number of molecules could be started with, the same equilibrium
state between carbamate, carbonate, and water, would be arrived at
for the same temperature, whether ammonium carbamate or normal
carbonate were initially taken—that is, that the curves of hydration
and dehydration would meet at the same point. I hope before long to
be able to make experiments in this direction.

Since there is this tendency for ammonium carbonate to become in
part dehydrated in aqueous solution, and for the system to come toa
state of equilibrium where the carbamate and carbonate co-exist, it
seems probable that the hydrolysis of urea, under the action of
ferments, &c., may be less simple than is usually represented—that
the reaction, instead of being simply CO(NH,),+2H,O=CO(ONH,),,
may be of the following type :—

nCO(NH,),+ (2n—m)H,0=mCO(NH,)(ONH,) + (n—m)CO(ONH,)».

I propose to attack this subject by the same method as those
employed above. :

By means of the actions of sodium hypochlorite and hypobromite
it is evidently possible and easy to estimate quantitatively wrea,
carbamic acid, and ammonia, when all are present in the same
solution.

Take two equal portions of the solution to be examined, treat one
with sodium hypobromite, and let the volume of nitrogen evolved
(corrected for loss) = Vj.

Treat the other portion with sodium hypochlorite, and let V,=
volume of nitrogen obtained.

Act upon the residue from this last experiment with sodium hypo-

1885.; Limited Hydration of Ammonium Carbamate. 393

uonoiphyy

Falicabe ee

|
S
SN
D
i?)
N
AS)
S
8
R
ira)
2
~.
~
NS
es
CN
Sy

PIJOWPIUMISSD APZON, f2 Sa7NIZIOAT

-UIYD) AZDUDGA

: 20 e4 26 32
Lntervals of five minutes

bromite, and let V3 represent the volume of nitrogen given off
(corrected).

Let «=volume of nitrogen due to urea.
= es - ammonia.
a carbamic acid.

99 by) 99

Then Ql.) w+tytz=V).
2. WL y=V,.
(2.) piace 2
(2.) ee

A preliminary trial of this method with a mixture of urea and
ammonium carbamate gave very satisfactory results.

It appears to me that no really satisfactory method has hitherto
been known by which carbamic acid could be detected and estimated
in presence of urea and ammonia, so that the process indicated above
may perhaps be of service in investigations bearing on the formation
of urea in the animal body, and its origin, whether carbamic or
otherwise.

bo
o

VOL. XXXTX.

394 Prof. J. W. Judd. [Dec. 10,

IV. “On the Relation of the Reptiliferous Sandstone of Elgin
to the Upper Old Red Sandstone.” By Professor JouHN W-
JUDD, F.R.S., Sec. G.S. Received November 19, 1885.

The question of the geological age of the yellow sandstones of the
district lying to the north of the city of Elgin has been, as is well
known, the subject of very animated discussions among geologists.
Some have even gone so far as to assert that the evidence on the
question, which has been adduced by paleontologists, is absolutely
incapable of reconciliation with that relied upon by stratigraphists.

Until the discovery of fossils in the beds in question, it was quite
natural to suppose that these white and yellow sandstones, which
locally assume reddish tints, are part and parcel of the Upper Old
“Red Sandstone—a formation presenting somewhat similar mineral
characters, and covering a considerable area in the district. This
was the view which was taken by Murchison and Sedgwick, Dr. Mal-
colmson, Dr. Gordon, Mr. A. Robertson of Inverugie, Captain Brick-
enden, Mr. Patrick Duff, Mr. Martin, and indeed of all the geologists
who at first studied the relations of the rocks in Morayshire.

But when fossils, which proved to be of great interest and impor-
tance both to the geologist and the biologist, were detected in this
formation, a careful re-examination of the evidence relied upon by
these geological pioneers was called for. The nature of these remark-
able fossils was indeed calculated to awaken the gravest doubt as to
the correctness of the commonly received opinions concerning the
position in the geological series of the strata which yielded them.

In 1844 Mr. Patrick Duff obtained from the quarries at Lossie-
mouth, near Elgin, a cast of portion of the dermal covering of an
organism of considerable size. Drawings of this fossil were sent by
Mr. A. Robertson, of Inverugie, to Agassiz, and were by that natu-
ralist described under the name of Stagonolepis Robertsoni.* Agassiz
regarded the fossil as the impression of the scales of a ganoid fish allied
to Megalichthys and Glyptopomus. Six years later, in 1850, Captain
Brickenden obtained, from quarries in the same rock, at Cummings-
town, a series of remarkable footprints, which were believed by most
paleontologists to indicate the existence of reptiles at the time when
the beds were deposited ; and in the following year Mr. Patrick Duff
obtained from the Spynie quarries the skeleton of a small Lacertilian,
which was described by Mantell under the name of Telerpeton
Elginense.~ Shortly after this, many more footprints were detected

* “Monographie des Poissons Fossiles du Vieux Grés Rouge, &c.’”’ (1844-5),
p. 1389.
+ “Quart. Journ. Geol. Soc.,”’ vol. viii (1852), p. 97.

1885. ] On the Reptiliferous Sandstone of Elgin. 395

in the quarries about Cummingstown and Hopeman, and casts of the
dermal armour of Stagonolepis were obtained from Findrassie, a little
to the south-west of Spynie.

In 1858, Professor Huxley made the important announcement that
Stagonolepis was not a fish, as supposed by Agassiz, but a Crocodilian ;
at the same time stating that he had recognized the remains of a third
species of reptile among fossils sent to him by Dr. Gordon from
Lossiemouth ; this new reptile subsequently received the name of
Hyperodapedon Gordoni.*

In 1867 the same author was able to demonstrate from fresh and
better preserved specimens which had been discovered at Lossie-
mouth, that Telerpeton was not only a true Lizard, but one of a very

.specialised type;t and two years later he gave a full description of the
structure and zoological position of Hyperodapedon, showing it to have
been a Lacertilian having affinities with the recent Sphenodon and the

‘Triassic Rhynchosaurus ; he was also able to announce the discovery
of remains of the same genus in the Keuper of Warwickshire and
Devonshire, and in the Maledi (Trias) beds of India.t

The year 1877 was marked by the publication of Professor Huxley’s
Monograph on Stagonolepis, in which he referred to an interesting
cast of a jaw from the Findrassie quarry, to which he gave the name
of Dasygnathus longidens. This rather obscure fossil, it was shown,
might possibly be referable to the fishes or Labyrinthodonts, though
it presents some points of resemblance with the Dinosaurs.§

In the year 1884 I saw in the Elgin Museum the cast of a skeleton
which had recently been obtained from a quarry newly opened near
Elgin, and to be more particularly referred to in the sequel. This
fossil appeared to me to be so different from all the remains: hitherto
found in the formation, that I obtained an impression of it and sub-
mitted it to Professor Huxley, who recognised in it certain characters
distinctive of the Dinosauria. From the same quarry a skeleton
apparently belonging to another lizard, distinct alike from Telerpeton
and Hyperodapedon, with portions of the skeleton of the last-men-
tioned genus, were also obtained.

Returning to Elgin in the autumn of the prevent year, I was told
by my friend Dr. Gordon that another reptilian specimen, including
the skull and some other parts of the skeleton, had been found in ae
same quarry. On examining this specimen I at once saw that it
exhibited the characteristic features of Dicynodon, and my opinion on
the subject was confirmed by my friend Dr. Traquair, F.R.S., of

* “Quart. Journ. Geol. Soc.,’’ vol. xv (1859), p. 440.
+ Ibid., vol. xxiii (1867), p. 77.
ft Lbid., vol. xxv (1869), p. 138.
§ “Memoirs of the Geological Survey of the United Kingdom,” Monograph IIT
(1877).
2d 2

396 | Prot wey We duday aa [Dec. 10,

Hdinburgh, who, at my request, proceeded to examine the specimen.
A second example of the same genus has since been discovered, and I
trust that ere long a full description of this interesting addition to

‘our British fossils will be given by Dr. Traquair.

In addition to these facts, I may add that casts of teeth, undis-
tinguishable from those of Ceratodus, were some time ago obtained
from the Spynie quarries.

The present state of the paleontological evidence concerning the
age of the beds then is as follows. The strata have yielded the
remains of no less than four orders of reptiles, all of them belonging
to forms very different to any which have been found in Paleozoic
rocks. The Lacertilia are represented by Telerpeton, Hyperodapedon,
and an undescribed form; Crocodilia by Stagonolepis; Dinosauria
by an undescribed skeleton and possibly by Dasygnathus ; and Dicy-
nodontia by two individuals belonging to the type genus of the order.
In addition to these we have a great number of footprints differing
so greatly in form and size that they must probably have been made
by creatures of very different proportions and organisation. Professor
Huxley in his later researches on the subjects of these footprints* points
out the necessity of the greatest caution in any attempts to correlate
them with either of the reptiles whose skeletons have been found in.
the same formation; indeed, he hesitates as to whether the most per-
fectly preserved of them should be referred to Amphibians or to
representatives of one or other of the orders of Reptilia. Among
the less perfect of the markings in these and other rocks of the
Elgin district, there are not a few concerning which I have serious
doubts whether they are to be ascribed to vertebrate animals at all.

It will be seen from this summary that the paleontological evidence
in favour of the Triassic age of the Hlgin sandstones is now absolutely
overwhelming. Besides the remains of Hyperodapedon and Dicynodon,
genera which appear to be confined to Triassic strata, in districts so
widely separated as South Africa, India, the Ural Mountains, and the
British Islands, we have Stagonolepis, a crocodile with Mesozoic
affinities, the highly organised Telerpeton, and Dinosaurs; the last
mentioned having never been found in any rocks older than Trias.
Ceratodus, too, has usually been regarded as having commenced in
the Trias, though it must be admitted that difficulty may exist in
separating the cast found at Spynie from Otenodus, which occurs in
the Carboniferous, or Dipterws, which occurs in the Devonian.

There are certain facts concerning the distribution of these fossils
in the formation where they occur, to which it may be instructive to
refer as bringing out into strong relief the imperfection of the
geological record. The footprints, which are so abundant at Cum-
mingstown and Hopeman, would appear to have been seldom, if ever,

* “Mem. Geol. Survey,’ Monograph ITI, pp. 46-51.

1885. ] On the Reptiliferous Sandstone of Elgin. 397

found in the quarries where the bones and scutes occur. All the
specimens of these bones and scutes which have been obtained at
Lossiemouth seem to have occurred in a single course of rock at the
bottom of the quarries, where the useful building stone ceases. All
the specimens obtained from this locality seem to belong to Stagono-
lepis, Hyperodapedon, and Telerpeton. In the new quarry near Elgin,
however, neither Stagonolepis nor Telerpeton has been found, but
Dinosaurs and Dicynodonts occur.

Let us now inquire what is the nature of the stratigraphical
evidence which has been regarded as opposed to the paleontological
arguments in favour of the Triassic age of this formation. At the
outset it is necessary to bear in mind two very important circum-
stances. first. The exposures of the Reptiliferous Sandstone and
of the Upper Old Red in the district are more or less isolated, the
greater part of the country being thickly covered by drift and other
superficial deposits. Secondly. The whole of the rocks in the district
exhibit evidence of having undergone great disturbance; this is
shown by their steep inclinations, and by the foldings and fractures
which can often be recognised in the quarries opened in them.

The Reptiliferous Sandstone makes its appearance at the surface in
two parallel ridges, ranging from north-east to south-west for a dis-
tance of about nine miles. The most northerly of these ridges extends
from Brandenburgh to Burghead. Although the rocks are well
exhibited both in sea-cliffs and in reefs on the shore, the only fossils
obtained from them are the footprints of the Cummingstown and Hope-
man quarries, near the south-western extremity of the ridge, and the
remains of Stagonolepis, Telerpeton, and Hyperodapedon, found in a
single bed at Lossiemouth, at its north-eastern end. A tract of about
three miles wide, thickly covered by superficial deposits, completely
isolates the northern or coast ridge from the southern one, which is
known as the Quarrywood ridge. In this Quarrywood ridge the Reptili-
ferous Sandstone is only found along its northern face for a distance
of about three miles. The southern slope of the ridge is composed of the
ordinary rocks of the Upper Old Red Sandstone, containing Holo-
plychius nobilissimus Ag., with species of Glyptopomus and Pterichthys.
There is no evidence of the occurrence of Triassic strata, either along
the southern slopes of the Quarrywood ridge or in the district lying
still further south about the city of Elgin. The localities in which
the sandstone containing reptiles has been found along the northern
slope of the Quarrywood ridge are as follows:—At Spynie, which
may be regarded as a north-eastern prolongation of the Quarrywood
ridge, thé deep quarries have yielded Telerpeton, Hyperodapedon, and
Ceratodus. At Findrassie Wood, a mile and a half further to the
south-west, a quarry now abandoned, has yielded Staganolepis and
Dasygnathus. Lastly, the quarry near the top of the ridge, above

398 | Prof. J. W. Judd. (Dee. 10,

New Spynie Church, and a mile and a half still further to the south-
west than Findrassie, has yielded Hyperodapedon and another lizard
with a Dinosaur and a Dicynodont.

The difference in mineral characters between the Triassic Sand-
stone on the northern side of the Quarrywood ridge and the Upper
Old Red Sandstone on its southern face is certainly not a very
striking or well-marked one. But this is a circumstance at which no
geologist who is in the habit of studying the Old and the New Red
Sandstone will be surprised. Nevertheless, a careful study of the two
sets of rocks shows that there are appreciable differences between them,
and, as a matter of fact, practised observers like Dr. Gordon seldom
find any real difficulty in pronouncing at a glance whether any par-
ticular mass of building-stone belongs to the “reptiliferous” or the
‘‘ holoptychian ” formation. It must be admitted, however, that occa-
sionally the pale-pink Old-Red rock assumes a nearly white colour,
while the white or yellow “ reptiliferous ” rocks locally acquire reddish
tints, undistinguishable from those of the ‘‘ holoptychian ” sandstone.

In both the coast ridge and the Quarrywood ridge, as was well
pointed out by Dr. Gordon, the Reptiliferous Sandstone is seen to be
covered by a very peculiar and easily-recognisable deposit, known as
the ‘“Cherty rock of Stotfield.”’ It has been frequently suggested
that the preservation of these two sandstone ridges, and thus of the
whole peninsula between Burghead Bay and Spey Bay, was in all pro-
bability due to the presence of this remarkable rock, which offers such
resistance to the ordinary agents of denudation.* The rock consists
of a more or less intimate admixture of siliceous and calcareous mate-
rials, including also crystallised patches of galena, blende, and pyrites ;
it has yielded no trace of organic remains. Sir Roderick Murchison
compared the “ Cherty rock of Stotfield”” with the Cornstones of the
Old-Red rocks, with which, however, it has but lttle in common;
and some confusion appears to have arisen from bands of true Corn-
stone, which occur in Upper Old Red Sandstone to the south of Hlgin,
having been taken for the Cherty rock of the Trias.

Professor Harkness, in 1864, was able to show that the positions in
which the Cherty rock and the Reptiliferous Sandstone occur in the
neighbourhood of Elgin are such as can only be explained by the
existence of great faults. Ata later date, I showed how numerous are
the indications of disturbance in the district—evidence of tilting of
the beds, of actual contortion, and of fracture occurring in many of
the quarries. In the New Bishopmill Quarries, for example, the
effects of a fault, in throwing side by side beds of valuable freestone
and other sandstones unsuitable for building purposes, is very clearly
seen, and similar evidence is found all over the area where these beds
occur. On the north of the coast-ridge I have shown that beds of

* “Quart. Journ. Geol. Soc.,” vol. xx (1864), p. 424.

1885. ] On the Leptiliferous Sandstone of Elgin. 399

Inferior Oolite are seen faulted against the Trias of Stotfield,* and
the same is probably the,case also at Burghead. In the great
** Scars” or reefs which lie off this coast red sandstones are seen, and
I have been assured that scales of Holoptychius occur in them. If
this be true, then the whole of the Mesozoic strata, forming the
peninsula between Burghead Bay and Spey Bay, consists of rocks
which are actually let down by trough-faults and synclinal folds into
the midst of a tract of the Upper Old Red Sandstone. The presence
of such great lines of dislocation is unquestionable, and in the paper
referred to I have endeavoured by means of dotted lines to indicate
the approximate position of some of them. It must be remembered,
however, that in a country so deeply covered by drift as Northern
Morayshire, the working out of the relations of the rock-masses by
tracing their outcrops at the surface is an almost hopeless task.

As throwing an entirely new light on the age and relations of the
‘Reptiliferous Sandstone of Hlgin, I was able in the year 1873 to
show that strata identical in character with that deposit and with the
Cherty rock of Stotfield occur on the northern, as well as on the
southern side of the Moray Firth. At Dunrobin, in Sutherland, the
yellow sandstones are seen covered by the Cherty rock, and this in
turn is overlain in apparently conformable sequence by the various
members of the Lias and Oolite. The whole of the Mesozoic strata
of Sutherland are seen to be thrown by a great fault against the
Lower Old Red Sandstone and the Crystalline rocks of the Highlands.

Although it is certain, however, that some of the cases of juxta-
position between the Old Red and the Triassic strata must be due to
faulting, yet there are reasons for believing that the latter strata
lie directly and unconformably upon the former. But, as was re-
marked by Dr. Gordon in 1877, “the district is so covered by drift
that no junction of the Holoptychian and the Reptiliferous strata has
been laid bare.”

It was therefore with the greatest interest that in the summer of
1884 I learned from that veteran geologist, whose important services
to science have extended over a period of more than half a century,
that the bones of reptiles had at last been detected in the same
quarry with the remains of Holoptychius. On repairing to Elgin I
received the greatest assistance in investigating the matter from Mr.
J. Gordon Phillips, the intelligent and energetic curator of the Elgin
Museum.

It appears that about the beginning of 1882 an old stone-pit, known
as ‘the Millstone Quarry,” and situated near the summit of the
Quarrywood ridge, immediately above the church of New Spynie, had
been reopened, and extensive excavations had since been carried on
there. The beds here present a somewhat similar character to those

* “Quart. Journ. Geol. Soc.,” vol. xxix (1873), p. 128, &c.

400 Wve 8) Biro Nie dial [Dee. 10,

of Lossiemouth‘and Spynie, consisting of white or pale-yellow sand-
stone, containing occasional black particles composed of iron and
manganese oxides. The sandstones of this pit are generally much
coarser in grain than those at Lossiemouth and Spynie, and they some-
times even pass into a grit. In some of the beds, particles of fel-
spar occur in such profusion as almost to cause the rock to assume
the appearance of an ‘“‘arkose.”’ That these rocks really belong to
the Reptiliferous Sandstone has been confirmed by the finding, up
to the present time, of no less than six skeletons of reptiles, and
by the total absence from them of the “‘ Old-Red ” fish-remains.

The Reptiliferous Sandstone, both of the coast ridge and of the
Quarrywood ridge, not unfrequently contains scattered pebbles of
quartz; but at the “ Cutties’ Hillock Quarry,” as the new pit is now
called, this feature is more strikingly exhibited, and such quartz-
pebbles become very abundant, especially in some of the lower beds.
As the excavations were carried downwards, indeed, the coarse sand-
stone was seen passing into a conglomerate, called by the workmen
the “ pebbly-post.” This bed of conglomerate was found to be from
3 feet 6 inches to 4 feet thick, and, it being considered desirable to
determine if other courses of freestone fit for building purposes under-
lie the “ pebbly-post,” a trial-shaft was opened at the bottom of the
quarry. :

It was discovered in this way that the ‘‘ pebbly-post,”’ which in its
lower portion becomes more perfectly conglomeratic, and contains
pebbles of white and purple quartz up to the size of the fist, rests on
beds of pink and red sandstones, very finely laminated, and exhibiting
evidence of much false-bedding. These beds are strikingly different in
character from the coarse-grained, white sandstones lying above the
“‘nebbly-post,” in which the bedding is usually indistinct and im-
perfect. The stone lying below the conglomerate was found to be
unsuited for building purposes, and the trial-shaft, after being carried
to the depth of 13 feet in the bottom-rock, was abandoned; very
fortunately, however, the last blast which was fired in it revealed a
remarkably fine specimen of Holoptychius, which has been identified
by Dr. Traquair as H. nobilissimus, and is now in the Elgin Museum.

It unfortunately happened that no careful geological study was
made of the beds exposed in the trial-shaft at the time when it was
open; but I was able, with the assistance of Mr. J. Gordon Phillips,
and of Mr. Watts, the very intelligent lessee of the quarry, aided by
an inspection of the materials thrown out, to substantiate the above
facts and to add the following details :—

The red and finely-laminated sandstones of the Upper Old Red
Sandstone are directly overlain by the bed of quartzose conglomerate.
This latter bed, which is from 3 feet 6 inches to 4 feet in thickness,
contains fewer and smaller pebbles in its upper part, and thus

C14

1885. | On the Reptiliferous Sandstone of Elgin. 401

graduates insensibly into the coarse Reptiliferous Sandstone, which
forms a number of courses, each from 8 feet to 4 feet thick, and are
exposed to a depth of over 20 feet. The Reptiliferous Sandstone in this
pit section exhibits evidence of considerable disturbance ; its beds dip
to the north-east at an angle of about 15°, while, at one part of the pit,
there are indications, in great slickensided surfaces and a slight dis-
placement of the beds, of a small fault. In these upper sandstones
remains of a least six reptiles have up to the present time been dis-
covered, five of them occurring in one course of stone, while the
remaining one came from the bed immediately below. The forms
represented in this pit are Hyperodapedon, and another lizard,
Dicynodon, and a Dinosaur.

The characters of the sandstones above the bed of conglomerate are
very distinct from those of the sandstones below it. The former are
very fine grained and have their lamination very strongly pronounced,
exhibiting much false-bedding; while the latter are usually much
coarser and seldom show any trace of stratification. The colours, too,
are very distinctive, but this is a character upon which it would be
unwise to place much reliance. Examined in thin sections, under the
microscope, I found that the two sandstones present well-marked and
constant differences.

_ These facts all point to the conclusion that the Reptiliferous Sand-
stone of Hlgin passes downwards into a bed of conglomerate, which
rests unconformably upon the strata of the Upper Old Red Sandstone.

During a visit to Sutherland last year, I also obtained evidence that
a precisely similar relation in all probability exists between the
Triassic rocks and the Upper Old Red Sandstone on the northern side
of the Murray Firth.

Some years ago Dr. Joass of Golspie found remains of Holoptychius
in the sandstones which crop out in reefs on the shore at some distance
southward from that place. Between these reefs of Upper Old Red
Sandstone and those of Dunrobin, where I was able in 1873 to
identify the Reptiliferous Sandstone and the Cherty rock overlying it,
the rocks are wholly concealed. But Dr. Joass showed me masses of
a conglomerate which are frequently thrown up by the waves on the
Golspie shore, containing yellow and purple quartz-pebbles, and
identical in character with the rock of the “‘pebbly-post”’ in the
Cutties, Hillock Quarry near Elgin. There can be little doubt that.
the bed from which these fragments are derived lies between the
Trias and the Upper Old Red Sandstone of the Sutherland coast.

The Royal Society long ago testified its sense of the importance of
determining the age and relations of the remarkable strata of Elgin,
by appointing a Committee and making a grant from the Donation
Fund to aid in securing new specimens of the fossils. Seeing, then,
that an opportunity offered itself for determining the exact relations

402 Prof, J. W. Judd. ~ [Dec. 10,

of the Reptiliferous to the Holoptychian beds, I preferred a request to
the Council of this Society for a grant to be applied in excavations
directed to uncovering the line of junction between the two beds.

My request having been acceded to, the kind intervention of Dr.
Gordon obtained for me the permission of Thomas Yool, Esq., of
Leuchars, the factor of the Karl of Fife, on whose property the quarry
is situated, for carrying out the necessary work. The Messrs. A. and
W. Watt, the lessees of the quarry, not only rendered much valuable
advice and assistance, but kindly undertook the personal superintend-
ence of the necessary operations. In making a careful examination
of the pit, after it had been opened, I had the great advantage of the
aid and judicious counsel of Professor T. G. Bonney, F.R.S8., Pre-
sident of the Geological Society.

We were able to observe that, while the conglomerate of the
““ pebbly-post ” graduates insensibly into the overlying Reptiliferous
Sandstone, it is sharply divided from the red sandstones below. It
was unfortunately found that, owing to the imperfect bedding of the
upper series and the prevalence of oblique lamination in the lower
one, it was impossible to obtain decisive evidence of a discordance of
dip between them. But the line of junction between the two sets of
strata, which was exposed for a distance of 10 feet only, showed
every appearance of being an eroded one. We came to the conclusion
that while the upper series having the “‘ pebbly-post ”’ for its base, is
certainly perfectly distinct from the lower one, there can scarcely be
the smallest doubt that the former rests uncomformably upon the
latter; in other words, the evidence points to the conclusion that
during the vast periods of the Carbiniferous and Permian, the Upper
Old Red Sandstone of the Elgin area was upheaved and denuded, and
that subsequently the Upper Trias beds were deposited unconformably
upon the eroded surface.

As the question of the age and relations of these interesting rocks
may now be considered as definitely settled, it may be well to give a
brief résumé of what is known concerning the interesting patches of
Triassic strata in the east of Scotland, from which such important
paleontological treasures have been derived.

There is reason for believing that the Trias of this district does
not exceed 200 to 300 feet in thickness. At present it is known
to occur only in the coast ridge, 9 miles long and about 1 mile
broad, and on the northern slope of the Quarrywood ridge for a
distance of about 3 miles. Outlying patches, like the Boar Rock
in Spey Bay, show that its superficial extent has been greatly reduced
by denudation and the deposit of drift upon it. Similar beds covering
only a very small area however, make their appearance on the
northern side of the Moray Firth, between Dunrobin and Golspie.

The lowest member of the formation consists of quartzose con-

1885. | On the Reptiliferous Sandstone of Elgin. 403

glomerate, very similar to that which occurs in the Poikilitic of the
west coast of Scotland, and of many parts of England. This, by
the gradual diminution in the size and number of the pebbles, passes
occasionally up insensibly into a coarse grit, containing scattered
quartz pebbles, and, finally, into the very fine-grained white or yellow
sandstone which constitutes the bulk of the formation.

In the whole of this deposit, organic remains are very sparsely dis-
tributed. The extensive sea-cliffs and shore-reefs of the coast ridge
have not yielded a single specimen, nor have any fossils been found in
similar situations in Sutherland. Many of the largely worked quarries
have proved equally barren. Several quarries in immediate proximity
to one another have, however, yielded footprints, and a single band
of soft rock in the Lossiemouth Quarries, situated at the depth of
about 100 feet from the top of the sandstone series, has yielded many
remains of Stagonolepis, Hyperodapedon, and Telerpeton. It is not
improbable that it is a bed on about the same horizon which has
yielded Telerpeton, Hyperodapedon, and Oeratodus at Spynie, and
Stagonolepis and Dasygnathus at Findrassie. The new quarry at
Cutties’ Hillock, however, is certainly opened in beds lower in the
series, and, indeed, near its base. The only form up to the present
found in this lower division which is common to it and the higher
strata is Hyperodapedon, but the lower. beds have also yielded a
Dinosaur, a Dicynodont, and a new species of Lacertian. There are
good grounds tor anticipating further important discoveries in this
part of the series, as large quantities of stone are now being taken
from the quarry in which it is exposed.

The beds of the Reptiliferous Sandstone are often seen to be traversed
vertically by masses of a hard quartzite-like rock, which,are known to
the quarrymen as “ keys.”’ Such masses are seen rising through the
sandstones in the sea-cliffs, and in many of the quarries, where, being
unfit for building purposes, they are either avoided in the quarrying
operations, or are broken up to serve as road-metal. A key of this
kind is present in the quarry at Cutties’ Hillock. Microscopic exami-
nation of these quartzite-like masses shows them to consist of the
ordinary white or yellow sandstone, in which silica has been deposited
in the form of quartz upon and between the individual grains. As
in the case of the “ crystallised sandstones,” and many quartzites,
the secondary silica is in crystallographic continuity with the quartz
grains on which it is deposited ; this is clearly shown when thin
sections of the rock are examined by polarised light, the orientations
of the original and the secondary quartz, as exhibited by their optical
characters, being thereby rendered manifest.

Overlying the Reptiliferous Sandstone is the very remarkable cal-
careous and siliceous rock, known as the ‘‘ Cherty rock of Stotfield,”
the peculiar characters of which have been already indicated. At

404 Profs. V. A. Horsley and Ey A. Schifen! | eesame

present this member of the series is only seen as a number of isolated
patches, and we have no evidence as to whether it ever constituted a
continuous deposit. Its thickness is never great, and probably in no
case exceeds 30 feet.

The “Cherty rock of Stotfield”” which has afforded no traces of
organic remains, even when studied under the microscope, is evidently
a chemical and not an organic deposit. Its appearance and characters,
indeed, strongly suggested that, like very similar deposits in Hun-
gary, it may have been formed by geysers, an idea which was
entertained by Sir Charles Lyell. If this be so, it is impossible to
avoid entertaining the suggestion that the formation of the keys may
have been due to the rise of heated water containing silica in solution
along the joint planes of sandstones below. Some support is afforded
to this suggestion by the fact that where, as at Stotfield, the Cherty
rock is largely developed, there the quartzite ‘“‘ keys” are particularly
numerous in the underlying sandstones.

It may be of some interest to add that the Trias of the district of
Scania in Southern Sweden contains rocks quite undistinguishable in
their mineral characters from the Pebbly Conglomerate, the Repti-
liferous Sandstone, and the Cherty rock of the Trias of Hastern
Scotland.

V. “Experimental Researches in Cerebral Physiology. IL On
the Muscular Contractions which are evoked by Excitation
of the Motor Tract.” By V. A. HORSLEY, Mis iaae:
Professor Superintendent of the Brown Institution and
Assistant Professor of Pathology im University College,
London, and E. A. ScHAFER, F.R.S., Jodrell Professor of
Physiology in University College. Received December 1,
1885.

The following note gives the results of a large number of experi-
ments which we have undertaken, in order to determine the character
of the muscular contractions which result from excitation of the several
parts of the motor tract, especially with reference to the rhythm
with which the skeletal muscles respond to such excitation.

For the purpose of our experiments we may consider the motor
tract under four heads, viz.:—l. Its commencement in the nerve-
cells of the cerebral cortex. 2. The connexion of these cells with
the lower nerve-centres by the nerve-fibres in the corona radiata.
3. Its continuation along the medulla oblongata and medulla spinalis
(including the nerve-cells of those structures). 4. Its peripheral con-
tinuation along the motor nerves.

1885.] Experimental Researches in Cerebral Physiology. 405

Methods.—Our method of proceeding has been to excite these

several parts in succession, and record the contractions of one of the
limb muscles upon a moving blackened surface, either by directly
connecting the tendon with the lever of a myograph, or by Marey’s
method of transmission by tambours and indiarubber tubing, the time
being simultaneously recorded upon the moving surface by a clock
marking seconds. Usually the rate and duration of the excitation
were also recorded by a small electromagnet. Besides the contrac-
tions resulting from electrical excitation, we have frequently obtained
an accidental record upon the moving surface of spontaneous or
voluntary contractions of the muscle the responses of which to elec-
trical excitation of the cortex cerebri we were preparing to record,
and we have thus been able to compare these records of voluntary
contractions in animals both with the results of electrical excitation
of the several parts of the motor tract in the same animals, and with
records of voluntary contractions in the human subject. We have
also studied in the same way the epileptoid contractions which are
often found to follow a period of electrical excitation of the cortex
cerebri in animals, and have compared these epileptoid contractions
with numerous others recorded by one of us from cases of true epi-
lepsy and other affections of the nervous system (in man and animals)
accompanied by rhythmic muscular movements.
_ Results.—It was somewhat vaguely stated by Franck and Pitres,*
and has generally been admitted by other authors, that so far as
regards the rhythm of muscular response, the result of exciting either
the cerebral cortex or any other part of the motor tract is precisely
the same as that which is well known to be the case with the excita-
tion of the motor nerve, namely, that for all rates of excitation the
rhythm of muscular response is identical with the rhythm of excita-
tion. Our experiments on the contrary show that this statement only
holds good for low rates of excitation up to about ten or twelve per
second, but that for all higher rates of excitation of the cortex
cerebri, corona radiata, or medulla spinalis the muscular response does
not vary with the rate of excitation, but maintains a constant rhythm
which is independent of the excitation rate and approximates to ten
per second.

The muscle-curves which we have obtained from different mammals
as the result of successive excitation of the cortex cerebri, corona
radiata after removal of the superjavent cortex, and of the cervical
cord after section below the medulla oblongata, are very similar to one
another, and exhibit along their course, both at the commencement
and during the whole extent of contraction of the muscle, small but
distinct undulations following one another at the rate of about ten

* “Travaux du Laboratoire de Marey,” iv, 1879, pp. 412-447. See also a paper
by the same author in the “ Arch. de Physiologie,’ Nos. 1 and 2, 1885.

A06 Profs. V. A. Horsley and E. A. Schafer. (Dee. 10,

per second, with very considerable regularity, although in a few
instances the rhythm may be a little slower or faster than these (eight.
to thirteen per second are the extreme variations recorded). These
undulations have the same rhythm and character whatever the rate
of excitation (unless this be allowed to fall below about ten per
second). Moreover, precisely similar undulations are always visible
upon the myographic curve of all voluntary or spontaneous contrac-
tions (including reflex contractions) both in the lower animals and in
man. :

It is further noted that in the record of the contractions of epilepsy
there can frequently be seen marked upon the larger curves, produced
by the relatively slow clonic spasms, smaller undulations succeeding
one another with a rhythm of eight or ten per second. In some cases
the clonic contractions themselves may attain this rate, but they are
then always simple and without any indications of smaller waves.

In a very few instances out of a very large number of experiments
there occurred upon the tracings obtained as the result of rapid exci-
tation of the cortex cerebri, corona radiata, and medulla spinalis,
besides the usual well marked undulations of the rate of about ten per
second, other very minute waves upon these undulations correspond-
ing in rhythm With the rate of excitation. These were the only
occasions in which we have obtained results at all similar to those
-mentioned by Franck and Pitres.

The accompanying tracings will serve to indicate the general
nature of our results. Tracings A, B, C, and D are all taken from
the same animal (dog). Tracing A shows the myographic curve
obtained during excitation of the cortex cerebri (sigmoid gyrus), as
well as the succeeding epilepsy. Tracing B was that obtained on
excitation of the subjacent corona. Tracing C resulted from excita-
tion of the cut spinal cord. Tracing D from excitation of the motor
nerve. The excitation was produced by varying the current through,
the primary coil of a sliding inductorium by a metallic reed vibrating
thirty times per second in the case of A, C, and D, and forty per
second in the case of B. ‘The vertical lines mark seconds. LE is
the tracing of a voluntary muscular contraction in man (opponens
pollicis).

Conclusions.—The main conclusions to be drawn from the results
of our experiments appear to be these:—1. That the normal rate of
discharge of nervous impulses from the motor nerve-cells of the
spinal cord along the motor nerve-fibres is approximately ten per
second.* 2. That in the case of nervous impulses reaching these

* This conclusion is supported by the fact that the rhythm of a clonus (e.g., ankle-
clonus) depending upon the activity of the spinal cord is also about 8 or LO per
second, and that the rhythm of strychnine-tetanus in the frog, as indicated by the
electrical variatious of the muscle-current, has about the same rate (Lovén).

407

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10}JB VJVIPVI BUOLOD JUsoR[qns oT} JO UOL}V4IOXO Jo J[NSeL OYA sv pouTe}go SuloRAy, ‘g

. ——— nent

"SpU000S YIVU SoyvUIpIO oY, *WOTYeIIOXe Jo oyeL puv portod oy} Fo prover YdvasSouoryo ‘g £ oaano orydeasoxut ‘vy
"I1Go409 Xo}A00 OY} FO MOTZeyTOxe pidva Jo 4]Nset OY} 8B SOP B JO WAAB-dL0F OYJ JO UINAOZISIP snSuo] LOsu0}xe OYy WOAZ pouteyqo Sutovay, “y

1885.] Lxperimental Researches in Cerebral Physiology.

408 Experimental Researches in Cerebral Physiology. (Dec. 10,

JERE

| | \
|
|

Bene a

sara ‘oN

C. Tracing obtained from the same muscle as in A and B as the result of excitation
of the distal end of the cut spinal cord.

E. Tracing of a voluntary contraction of the opponens pollicis (man).
The ordinates indicate seconds, as before.

nerve-cells in more rapid succession than about ten per second, a
process of summation occurs within the nerve-cells, so that the
rate of discharge remains about the same in all cases. 3. That the
nervous impulses which produce a voluntary contraction also traverse
the motor nerve-fibres at about the same rate. There is, however,
no distinct evidence to show whether this rhythm of the volitional
impulses is generated in the cells of the cerebral cortex, or in the cells
of the lowernerve-centres. 4. That the slower rhythm which is often
exhibited in epileptoid contractions is the result of a further summa-
tion, but there is no distinct evidence to show where this occurs.

1885. | The Form of the Wave Surface of Quartz. 409

5. That occasionally, though rarely, the summation of rapidly succeed-
ing nervous impulses may be only incompletely effected within the
nerve-cells of the spinal cord, or may not occur at all. In these cases
results similar to those of Franck and Pitres are obtained.

A more detailed account of these experiments will shortly be pub-
lished in the “‘ Journal of Physiology.”

rd

December 17, 1885.
Professor G. G. STOKES, D.C.L., President, in the Chair.

The Presents received were laid on the table, and thanks ordered for
them.

Professor Horace Lamb (elected 1884) was admitted into the Society.

The following Papers were read :—

I. “ An Experimental Investigation into the Form of the Wave
Surface of Quartz.” By James C. McConnEL, B.A. Com-
municated by R. T. GLAZEBROOK, M.A., F.R.S. Received
November 9, 1885.

(Abstract.)

The paper contains an account of a number of measurements of
the well-known “dark rings” of quartz. Hach ring is due to one
wave being retarded in the quartz behind the other by an integral
number of wave-lengths, so the measurements give the directions
through the plate of quartz corresponding to a series of known
retardations. The relative retardation is, especially in a crystal of
weak double-refracting power like quartz, mainly dependent on the
distance between the two sheets of the wave surface. Thus my
observations really give the separation between the two sheets at
various points, and it is in this separation that the peculiarities of
quartz are most strongly marked, and the various expressions put
forward by theory most widely divergent.

With a plate cut at right angles to the axis, | obtained values of
the separation from ¢=4° to 6=39°—¢@ being the angle between the
ordinary wave normal and the axis—and with a plate cut parallel to
the axis I obtained values from 6=53° to ¢=90".

An obvious danger in this mode of investigating the wave surface

VOL, XXXIX. 26

410 Mr. J.C. McConnel. On the [Dec. 17,

is the influence of the refraction effects. This is discussed at some
length in the paper, and is shown to be in all probability negligible.
The measurements were taken with a spectrometer fitted up as a
polariscope, whose great focal length and finely graduated circle were
of much service.
I found it convenient to treat separately the region near the axis,

where the abnormal form of the wave surface of quartz is most:

obvious. I have compared my results with nine different theories,
each of which gives an expression of one of the two following forms.

D2 Psm- @ 4 Dy
D?=P,? sin* 6+ D,? cost d.

Here D is “the number of wave-lengths by which one wave lags

behind the other in air, after the lhght has traversed normally a

plate of quartz one millimetre thick, the normal to whose faces makes
an angle @ with the optic axis.” Dy) is the value of D when ¢=0,
and js known from the rotatory power, and P, and P, are constants to
which the theories assign different values. By inserting the observed
values of D and ¢, I obtained values of P, and P, from each ring.
The results from one plate about 20 mm. thick were as follows :—

Dae. HX 4° 24" 5° 514’ 6° S1P 7° 408’ 8° 234" 9° 38’ 11° 41’
1 SN a A les 15°054 .15°207 15°220 15:260 15°249 15°258 15-269
Eee ee 15:220. 15°293° 15°290 15:31]. '15:295 . 15 292 ee

Similar results were obtained from a second plate about 27 mm.
thick.

From these figures I concluded that the second expression was the
correct one, and that P,=15°30+'01. There is a considerable dis-
crepancy in the case of the first ring, of which two possible ex-
planations are given in the paper.

a—b

= =15°351, where a and 0 are the wave velo-
a

Cauchy gives P,»=
cities perpendicular to the optic axis.

pi omni yk 51 79,
1—b? 2a ar

Lommel gives P

iettier Gee ae ease ee aa
2b ar

Sarkan () a0 Pye eee one,
2a ar

The other five, MacCullagh, Clebsch, Lang, Boussinesq, and Voigt,

have the first form of expression and give a o—* = 15806.
a a—

é
ts

1885. ] Form of the Wave Surface of Quartz. 411

Thus Sarrau alone succeeds in explaining the observations satisfac-
torily.

For the larger values of ¢, I calculated on Sarrau’s theory what
value of a—b was required to give the retardation observed in each
ring, and obtained as follows :—

Qi lle aieian's # Moy dae 21" 28° 16k 28072) 82) 85° B40") 887 367
a—b ... °0037916 -0037922 -0037927 -0037931 °0037939 -0037932 °0037936

The observations on the plate cut parallel to the axis gave—

Gay lay Ae Bom oO maT MUL rotmdoe ego lark 497 53. Sar 40"? 85° 37”
a—b ... °0037949 -0037947 -0037945 °0037944 °0037943 °0037946 °0037944,
In this last set the retardation amounted to about 300 wave-lengths,
so that the bands corresponding to the two D lines were consider-
ably separated, and the bands seen were consequently ill defined.
Fortunately, however, a large angular error only produced a small
change in a—b, so that these results are far more accurate than those
of the other two sets. Forg@>50° the rotatory term is negligible, and
Sarrau’s theory is reduced to the simple Huyghenian construction.
So our observations show that for @>50° the Huyghenian construc-
tion represents the wave surface in quartz with great accuracy.

From @=15° to 6=50° there is a slight but persistent increase of
a—b with ¢ It is shown in the paper that this may be satisfactorily
accounted for by using the more general form of Sarrau’s wave
surface, viz., (s?— a”) (s*—a? cos? @—L? sin? ¢).

Aa?

2

(gz cos? +f, sin? P) (gg cos? P—g, sin’).

Here s is the wave velocity and a, b, go, f;, g, are constants, gy
depending on the rotatory power. Up to this point we have been
supposing f, and g, are negligible. If now we make 87a*g.(g,—f,)
= '00033(a?— b?)*\?, we find that Sarran’s theory agrees with observa-
tion throughout within the limits of experimental error, even in the
case of the first ring.

The observations were taken in the Cavendish Laboratory, Cam-
bridge, during the months of March and June, 1885.

For full.details as to the apparatus, the plates of quartz used, the
mode of observation, the precautions necessary, the temperature
effects, and the calculations, reference must be made to the paper.

bh
ie)
in)

412 Myr. J. Starkie Gardner. Fossil Plants and the | Dée-iNe

II. “Second Report on the Evidence of Fossil Plants regarding
the Age of the Tertiary Basalts of the North-East Atlantic.”
By J. STARKIE GARDNER. Communicated by Sir J. D.
Hooker, K.C.8S.L, F.R.S. Received November 30, 1885.

I have the honour to make known the results attending the expen-
diture of £75, placed in my hands by the Government Grant Com-
mittee for the purpose of investigating the fossil floras of Scotland,
which has been expended at Ardtun Head.

The position and physiography of this headland in the Isle of “Mall
has been fully described by the Duke of Argyll. It is the point of
land separating Loch Laigh and Loch Scridain, and is about two
miles in circumference and a mile across.

it is composed mainly of two sheets of basalt with remains of a
third sheet, on some eminences and along the shore of Loch Laigh.
These are almost horizontal, with a slight dip east, up Loch Seridain,
and a considerable dip in the same direction up Loch Laigh. The
upper sheet is not less than 40 to 50 feet thick, crystallised into rude
massive columns, now much fissured and weathered, whilst the
lowest presents a thickness of 60 feet, visible above low water, the
upper two-thirds being amorphous, and the rest fashioned into slender
and most perfect columns, bent in every direction, like those of the
Clam-shell cave at Staffa. The beds are so exceedingly horizontal
towards the seaward direction, that no one can doubt the columnar
basalts of Staffa and the Treshnish Isles, Geometra and the mainland
of Mull, being on the same horizon, if not parts of the same sheet.
Between the two great lava beds at Ardtun is intercalated a bed of
sedimentary deposit, reaching a maximum of 60 feet thick, and con-
sisting of pale very fine-grained clay and limestone at the base, then
sand and gravel, black laminated shales, whinstone, gravel, and
laminated sands. The gravels are made up of flint, pebbles, and
subangular rolled fragments of older lava beds, in a matrix of broken-
down volcanic material. They present all the ordinary lnes of
current bedding, beautifully weathered out, and the pebbles are
drifted precisely as in ordinary river gravels.

There can be no question whatever, indeed, but that the gravels are
the deposits of the waterway of a river, and the shales, its overflows
and backwaters. The river must have been of some magnitude, as
its deposits traverse the whole seaward face of the headland, and their
extension inland seems to be marked by the occurrence of two beds of
coal, which have, to a small extent, been worked, one near Bunessan
and the other nearer Ardtun village. An intrusive sheet of fine
compact basalt rises on one side of the head, cutting a devious way

1885. | Age of the Tertiary Basalts of the Atlantic. 413

through each bed in turn, and dipping beneath the sea at the other
extremity. On the coast, near the centre of the head, occurs a small
chine, apparently due to the weathering out of a vertical dyke, which
has cut through the gravels and shales, and left them in a very
accessible position ; it was here, accordingly, that I resolved to excavate
them.

With the assistance of the Duke of Argyll’s energetic factor, Mr.
Sinclair, men and tools and a barrel of powder were forthcoming,
and after a few days’ work and the removal of a mass of the intensely
indurated shingle bed, to the extent of perhaps hundreds of tons, many
square yards of the whinstone and the underlying black shales were
exposed. The large specimens of Platanites aceroides and Onoclea
hebridica, now exhibited, were the results. The new specimens of the
latter, including fertile as well as barren fronds, give a very different
idea of its growth to what would have been imagined from those
formerly known, and we see that the pinne were produced on very
long and stout naked stems. The ravine, however, proved an unfor-
tunate selection, for the whinstone became poorer in fossils as we got
farther in, and the underlying black shales, though crowded with
leaves, proved so squeezed and full of slickensides or faulted surfaces,
and, consequently, so brittle as to be practically valueless for collect-
ing purposes. The lighter limestone is wholly absent at this spot.
From the condition of the shales and calcined appearance of the
gravels—here of a steely-grey colour, intensely hard, with pure white
and occasionally cherry-coloured flints, it is evident that the ravine
must be the site of an old dyke, and if proof were wanting of a violent
upthrust at this spot, it is to be found in the upturned edges of the
bottom bed on the west face. The succession of beds in the section
we had been so laboriously working at in the ravine, in no way pre-
pared me for the discovery I made subsequently, that within 100 yards
there existed, many feet below the lowest sedimentary bed present in
the ravine, a deposit of limestone, rivalling in fineness and texture
the celebrated lithographic stone of Solenhofen, and containing, as
expressed by Professor Newberry, ‘‘ most exquisitely preserved leaves.”’
On removing some turf, in order to obtain a true section, I was over-
joyed to find this deposit, so completely different in character to any
previously seen in the basalts. It may seem strange that it should
have been overlooked by the many geologists who have visited the
spot; but the beds are in a very inaccessible position, and to work
them dangerous, until sufficient had been worked away to afford
standing room. Quarrymen could not be induced to work there at
all, but two boatmen did not make any objection.

It is too early to attempt as yet to give any account of the new
flora, which seems to differ considerably from that of the shales above.
Very large leaves of many kinds occur in the clay at the base, which

AVA Age of the Tertiary Basalts of the Atlantic. [Dec. 17, :

was so friable, however, that only fragments could be secured. The
leaves in the limestone are smaller and very sparsely scattered through
it; there are, moreover, no cleavage planes, and hence much patience
is required to obtain and develop them. I have obtained about twenty
species of dicotyledon from it, the most prevalent being Grewia crenata,
Hr., and Oorylus MacQuarrit, Forbes, and Acer arcticum, Hr., all of
which are also found in beds of the same age in Greenland. There
are no ferns and only three conifers, a large variety of Guilago adian-
toides, Unger, a new Podocarpus, the most northerly species I believe
yet found, and Taxus Campbelli. The fragments from the clays show
about eight additional species, and altogether I should judge that both
floras were very rich. All the conifers occur also in the shales, and a
specimen of Guzlago has long been in the collection at Inverary. The
most characteristic plants of the shales are those described by the
Duke of Argyll and Edward Forbes, Platanites aceroides and Rham-
nites multinervis. Tawites Campbelli is not, as affirmed by Heer,
identical with Sequoia Langsdorjir, but appears to be a true Taxus.
Some other leaves are certainly referable to Protophyllum, and we have
representatives apparently of leaves determined as Alnus, Cornus,
Berchenia, Populus, and Corylus—but among them there are none, so
far as I can ascertain, that have ever been found in Huropean beds of
Miocene age. This is a point, however, upon which I do not wish to
insist at present, farther than to say, that the flora seems to bear a
prima facie resemblance to cretaceous floras of America rather than to
any yet known from Europe. The resemblance of the Conifers to
those indigenous to China at the present day, is too remarkable to be
overlooked.

It has become evident that the fluviatile rocks of the British
basalts are of far greater extent and importance than had hitherto
been imagined. Before the complete account of them, which I hope
later on to prepare, can be proceeded with, their position in the series
has to be fixed, their lateral extension to be mapped.

The first of these points is fortunately not difficult to settle. The
base of the basalts is exposed at Burg Head on the opposite side of
Loch Scridain, resting upon Jurassic rocks and fragmentary masses of
chalk. The base of the series seems formed of two immense sheets
of ash, the lowest: of which is full of scoriw, and about 100 feet above
these, resting upon columnar basalt, in every respect similar to that
of Ardtun Head, are fluviatile beds, sands and clays from 9 to 12 feet
thick. Overlying these is a bed of rudely columnar basalt, and taking
account of all the circumstances, there cannot be much doubt about
the fluviatile series on both sides of the loch being upon the same
horizon. The beds are, in fact, seen to be horizontal to the west as
far as the eye can reach. The horizon of the Ardtun gravels would,
therefore, seem to be about 150 feet from the base of the series.

1885.] On Trichophyton tonsurans. 415

Taking into account the superior thickness of the basalts in Mull, and
above all the presence of ash beds at their base, it seems probable that
they were nearer the vents than Antrim, and that their lowest beds
are at least not newer, so that the Mull leaf-beds at 150 feet from
the base should be much older than the Glenarm and Ballypalady
leaf-beds at 600 feet from the base.

The horizontal extent of the fluviatile beds of Mull is more difficu't
to estimate. Gravel is mentioned as present at Loch Truadh, to the
north-west, and at Carsaig to the east. In the latter locality it is,
perhaps, thicker and more extensive than at Ardtun. The horizon
should also be found in two of the Treshnish isles and round the
north-west coast of Mull, and there can be little doubt but that
deposits of plants exist in many localities besides Ardtun. Black
_ shales, with identical leaves, have been found in Canna, and leaflets
of Taxus or a similar foliaged conifer at Uig.

Though the fluviatile beds at Bourg are unfossiliferous, a very
interesting relic of the Hocene vegetation occurs there, for a large
tree, with a trunk 5 feet in diameter, has been enveloped as it stood
to a height of 40 feet, by one of the underlying lava beds. Its solidity
and girth enabled it to resist the fire, but it subsequently decayed,
leaving a hollow cylinder filled in with debris and lined apparently
with the charred wood. ‘There is also the limb of a larger tree in a
fissure not far off. The wood proves to be coniferous, belonging
possibly to the Podocarpus whose leaves are so conspicuous in the
beds above.

III. “Addition to a former Paper on Trichophyton tonsurans.”
(“ Proc. Roy. Soc.,” vol. 33, p. 254.) By GEror@E Tun, M.D,
Communicated by Prof. M. Foster, Sec. R.S. Received
December 3, 1885.

In the “‘ Proc. Roy. Soc.,” vol. 33, p. 234, 1881, a paper of mine is
published on “ Trichophyton tonsurans.”’

Since the time that the investigations recorded in that paper were
made, the study of parasitic fungi has been greatly facilitated by the
introduction by Dr. Koch of gelatinised meat juice as a medium for
cultivation, and having again studied the development of tricho-
phyton with the advantages derived from the use of this medium, |
believe that two results which I have obtained might be usefully
published as a supplement to the paper referred to.

The gelatinised meat juice which I used was peptonised and
neutralised, and trichophyton grew on it readily and with certainty.

In my previous experiments (in which I used vitreous humour) I
had succeeded in growing the fungus when the hairs containing the

416 A New Form of Spectroscope. [Dec. 1%,

spores were floated on the surface of the fluid, but I had not suc-
ceeded in finding evidence of growth when the hairs were submerged.
This result must have been due to some accidental cause which
escaped undetected, as I have found that trichophyton grows when the
hairs are entirely submerged in the gelatinised beef juice, and the
spores are excluded from contact with the air.

In my previous paper I described a number of experiments which
appeared to show conclusively that trichophyton is not related to the
ordinary fungi (Penicilliwm, Mucor, &c.) with which it had been up to
that time confounded. The experiments with gelatinised meat juice
confirm that view. In many instances in which I cultivated tricho-
phyton on this medium I never once observed organs of fructification
or appearances that suggested that it could be identified with common
fungi. As regards Penicillium glaucum with which, from the abund-
ance of its spores in the atmosphere of laboratories, cultivations are
most likely to be, and are most often fouled, the difference can be
shown by a very simple experiment.

A layer of the gelatinised meat juice is poured over a pure slide
and allowed to cool under proper precautions. Ringworm hairs and
penicillium spores are “‘sown”’ in parallel lines on the surface of the
medium, and the slide is put in a moist chamber at ordinary tempera-

tures. If the slide is examined in from twenty-four to forty-eight.

hours the penicillium will be found to be growing with great rapidity,,.
whilst the mycelium of trichophyton has made in comparison very

little growth. Repeated crops of penicillium may be grown up to the

stage in which the characteristic organs of fructification are fully
developed, whilst during the same time the trichophyton mycelinm
grows steadily and slowly, with no distinct signs of spore formation
and no trace of organs of fructification.

I may add that, in a recent letter to me, Dr. Koch states his convic-
tion that trichophyton is a distinct and independent kind of fungus.

IV. ‘A New Form of Spectroscope.” By J. NoRMAN LOCKYER,
F.R.S. Received December 5, 1885.

Some two or three years ago, when the sun-spot work carried on
at Kensington revealed the different behaviour in different spots of
lines visible in the spectra of the same element, it seemed desirable
to extend similar observations to metallic prominences, and, if
possible, in such a way that comparisons over a considerable reach of
spectrum should be possible.

It then struck me that a grating cut in half, with one part movable,
would afford a ready means of doing this.

1885.] On the Formation of Vortex Rings by Drops. 417

Circumstances prevented the realisation of this scheme till quite
recently, when I put into Mr. Hilger’s hands a grating presented to
me by Mr. Rutherfurd.

The result is excellent. It is possible to observe C and F, for
instance, together quite conveniently, with either a normal or a tan-
gential slit. The only precautions necessary are to see that half of
the light passing through the object-glass falls on the half grating,
and that the rays which come to a focus on the slit plate are those
the wave-lengths of which are half way between the wave-lengths of
the two lines compared.

V. “On the Formation of Vortex Rings by Drops falling into
Liquids, and some allied Phenomena.” By J. J. THoMson,
M.A., F.R.S., Fellow of Trinity College, Cavendish Pro-
fessor of Experimental Physics, Cambridge, and H. F.
Nrewaut, M.A., Trinity College, Cambridge. Received
November 28, 1885.

When a drop of ink falls into water from not too great a height, it
descends through the water as a ring, in which there is evidently
considerable rotation about the circular axis passing through the
centres of its cross sections; as the ring travels down through the
water inequalities make their appearance: more ink seems to collect
in some parts of it than in others, and as these parts of the ring
descend more rapidly than the rest, it assumes some such appearance
as that shown in fig. 1. These aggregations as they descend develope

HinGeiee

fresh rings in the same way as the original ring was developed from
the drop. The ring is thus split up into several rings, each of which
is connected with its neighbours by threads of ink affording a very
pretty illustration of the continuity of motion in a liquid (see fig. 2).

As the secondary rings descend they develope other rings just as
they were developed from the original one, and the process of repro-
duction seems to go on indefinitely.

It is not every liquid, however, which, when dropped into water,
gives rise to rings, for if we drop into water any liquid which does
not mix with it, such as chloroform, the drop in consequence of the

-

418 Prof. J. J. Thomson and Mr. H. F. Newall. [Dec. 17,

surface tension remains spherical as it descends. In fact, we may say
that, with some few exceptions to be noticed later, rings are formed
only when a liquid is dropped into one with which it can mix. This
is important, because surface tension has been supposed to play an
important part in the formation of these rings; it is difficult, how-
ever, to see how any appreciable surface tension ean exist between
liquids that can mix, and as far as our experiments go they tend to
show that it is only the absence of surface tension which is necessary
for their production. There are, as we shali show later, many cases:
where rings are formed under circumstances in which there is no
possibility of capillary action, such as when the liquid into which the
drop falls is the same as the drop itself. As capillarity was found not
to be involved in the production of the rings, it seemed interesting to
investigate the subject further, and the following investigation was
undertaken with this object. As the result of our experiments we
have been led to a theory of the production of these rings of which
we shall now give a brief sketch in order to render the sequence of
our experiments more intelligible. ,

Let us suppose that a spherical drop falls into a hquid; the motion
of the liquid surrounding the drop will at first be much the same as
if a solid sphere of the same size were to fall into the liquid. Now,
when a sphere moves through a liquid the tangential velocity of the
liquid is different from the tangential velocity of the sphere, so that
the liquid flows past the sphere. If the sphere be fluid as well as the
medium in which it moves, there will not be an absolute discontinuity
in the motion, but only a very rapid change, so that there is a finite
alteration in an exceedingly small distance. This alteration is equiva-
lent to a vortex film covering the sphere, the lines of vortex motion
being horizontal circles, and if the liquid be viscous the vorticity in
the film will diffuse inwards and outwards. As the drop falls the
resistance makes it get flatter and flatter until it becomes disk-shaped ;
by this time, however, it is full of vortex motion, and as the disk-
shape is an unstable arrangement of vorticity, the disk must break up
into the stable arrangement—that of an anchor ring. This is a

1885.] On the Formation of Vortea Rings by Drops. 419

rough outline of the theory we adopt. It will be seen that the most
important property of the liquid concerned is its viscosity—the
viscosity must be such that when the drop has become disk-shaped
there should be enough vortex motion in it to cause it to break up; if
the viscosity is too small the vortex motion init will not have had time
to spread far by the time the drop has become disk-shaped, and so the
drop will continue to flatten and get into thin sheets with streaks of
vortex motion in it instead of breaking up into a ring, whilst if the
viscosity is too great the vortex motion will be dissipated before the
drop becomes disk-shaped.

We shall now give the experiments which led us to form the
conclusions. We began by investigating the change in the shape of
the drop before it became disk-shaped.

Shape of the Drop before rt becomes a Ring.

To study the change of shape of the drop as it falls through the
liquid we have had recourse to instantaneous illumination, and have
used for this the bright spark formed at breaking in a mercury cup a
circuit containing an electromagnet. It was necessary that we should
be able to illuminate the drop at any point of its fall, and it was
obviously convenient to make the actual fall of each drop start a set
of processes which should result in the spark. The figure shows
diagrammatically the arrangement we have used.

The drop is formed at the end of a small piece of glass tubing

Leclapchée — ~
BAG:

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ws L tl s

Nae

Filter Jupier

a ech

iil] I
i
Hh tN il

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ol Mercury
Z Cua

Grove ceils

420 Prof. J. J. Thomson and Mr. H. F. Newall. [Dee. 17,

3; inch in diameter, the liquid filtering slowly through a small filter
paper held by a wire ring in the upper end of the glass tube. The
tube and filter are fixed at one end of a light lever, which is counter-
poised at the other end and balanced carefully on a knife edge. The
lever was made of a narrow strip of brass foil, folded for the sake of
increased rigidity into a A-shape. On the lever between the knife
edge and the adjustable counterpoise a small piece of platinum is
fixed, and when the balance is set this is pressed lightly upwards
against a platinum point which is held in position by a brass arm.
The knife edge is connected with one terminal, the brass arm with
the other terminal of a circuit containing one or two Leclanché cells
and a Morse sounder, which we have adapted so as to serve asa
contact breaker in the spark circuit. The moving brass lever of the -
Morse is prolonged by means of a light wooden arm, and the arm
carries a wire tipped with platmum and bent so as to dip into a
mercury cup. A current from three or four Grove cells is passed
along this wire, and the circuit is completed through a strong electro-
magnet. The mercury cup is placed conveniently so as to illuminate
the drop as it falls.

In using the apparatus the following is the procedure :—Several
drops are passed into the filter paper, and the counterpoise is adjusted
so that contact is just made at the platinum points. Thus, the relay
circuit is complete, and as a consequence the lever of the Morse is
held down, and so the electromagnet circuit is made by the dipping
of the platinum tip into the mercury cup. The spring and counter-
poise of the relay and the mercury cup have been ‘‘set” so as to
give the spark at break at about the moment required. When the
drop detaches itself from the tube the equilibrium of the balance is
upset, the counterpoise sinks, and so breaks the relay circuit, which
consequently breaks the electromagnet circuit at the mercury surface,
and the spark so produced illuminates the drop at some point in its
descent. This point may be varied by altering the “setting” of the
relay and mercury cup.

Various liquids were used for dropping: fluorescein dissolved in
weak ammonia gave very good results for two or three drops when
dropped into water, but it soon diffused through the column of water,
and the drops were then no longer clear, as the efficient rays had been
absorbed at the surface of the column. Milk gave excellent results ;
but even when considerably diluted it is disagreeable to work with on
account of the greasiness that accumulates in the dropping tube, and’
of the cloudiness produced in the column. A weak solution of nitrate
of silver dropped into a column of weak sodic chloride solution was
found to do best, as very good rings are formed, and the precipitate.
may be discharged by the addition of a few drops of ammonia. The
results figured below are those obtained in this way.

1885. ] On the Formation of Vortex Rings by Drops. 421

We have observed a great number of drops at many different points
of their fall through the column into which they have been dropped,
and at any given instant have found that afew definite forms repeat
themselves. Thus we are led to believe that the conditions of fall,
though seemingly not altered, vary in a few definite ways, so that
successive drops do not always pass through the same series of phases.
Indeed, simple observation in continuous light shows clearly differences
in the perfection of formation of the rings under apparently similar
conditions. We have found a set of forms for a particular instant,
and from the various sets taken for successive instants, separated by
small intervals, we have picked out series of forms which strike us as
continuously derivable from one another.

Fig. 4.

Bap oi CQ gags Sar ey Ra BE CE

47742) z r

3 B)
COO)
Urers.

ae)
ESL oY

422 Prof. J. J. Thomson and Mr. H. F. Newall. [Dec. 17,

It will be seen at a glance from the figures that the variations are only
in the unimportant parts, whilst the essential parts are recognisably
the same. At the early stages the drop is more or less spherical ;
but as it descends, it gets flatter and flatter, as we might expect
since its motion is resisted, and at one of the stages becomes almost
disk-shaped, and passes very quickly from this into the ring
shape.

This change of shape, we imagine, is due to the presence of the
vortex motion, the distribution of rotation in the ring being a stable
arrangement of vortex motion, whilst that in the disk is not. The
vortex motion in the drop has travelled from the boundary, diffusing
according to the same laws as those which govern the conduction of
heat, the quantity corresponding to the diffusivity in the conduction of
heat being in this case p/p, where 1s the coefficient of viscosity and
p the density of the liquid. If «/p be very small, the vortex motion
will not travel far into the drop, whilst if it be large it will all have
diffused before the ring has become disc-shaped. In neither of these
cases should we expect the disk to change into a ring, and it will be
seen later on that as a matfer of fact it does not.

Effect of Dropping one Liquid into another.

A drop does not always make a ring when it falls into a vessel con-
taining liquid. We have tried the effect of letting a drop of one
liquid fall into a vessel containing another liquid for a good many
substances. The results are-given in the following table :—

Column of Water :—

Rings are formed when drops of the following liquids are let
fall into a column of water: milk, alcohol, blood, aqueous solu-
tions of sugar, of gum arabic, of potash, of permanganate of
potash, of carbonate of potash, of sodic chloride, of copper
sulphate, of nitrate of potash, of oleate of soda, of nitrate of
silver, of cobalt chloride, of carbonate of soda, of ammonic
chloride, hydrochloric acid, acetic acid, nitric acid, Plateau’s
soap solution, essence of carraway, solution of iodine in
ammonia, solution of fluorescein in ammonia, glycerine and
water, sulphuric acid.

Globules are formed when drops of the following liquids are let
fall into a column of water: carbon bisulphide, chloroform,
ether, olive oil, paraffin oil, turpentine.

Column of Paraffin Oil :—

Rings: carbon bisulphide, chloroform, ether, olive oil, turpen-
tine, butylic alcohol.

Globules: water, alcohol, essence of carraway, glycerine and
water, dilute sulphuric acid.

1885. ] On the Formation of Vortex Rings by Drops. 423

Column of Alcohol :—
Rings: carbon bisulphide, chloroform, water, turpentine, butylic
alcohol, sulphuric acid.
Globules: olive oil, paraffin oil.

It will be seen from the tables that a drop of one liquid only makes
a ring when let fall into another liquid, when the two liquids can mix,
and, therefore, when the surface tension is very small.

The following experiment shows that an exceedingly small amount
of surface tension is sufficient to prevent the formation of the rings.
Absolute alcohol dropped into benzene gives rings; water gives
globules : to about 10 c.c. of absolute alcohol water was added drop
by drop, the mixture was stirred, and a drop was let fall into ben-
zene. Until after the third drop of water had been added, little
change in the appearance was noticed; a ring was formed, and this
subdivided into secondary rings, and so on. After the fourth drop
was added, very small globules began to appear after a good many
subdivisions. After the fifth drop was added, the ring first formed
subdivided not into rings but into flattened globules. After the sixth
or seventh drop was added, the appearance of the primary ring
changed; there seemed to be a more definite surface to it; in fact a
small surface tension had sprung up. The globules formed on subdi-
vision of the ring were quite disconnected from one another, whereas
before there had been trails or festoons following each. After the
seventh or eighth drop of water was added, the formation of the
primary ring seemed uncertain; the flattened globule, if large, broke
up irregularly into smaller globules without the intervention of the
ring shape. ‘This experiment shows that if a liquid A forms spheres
when let fall into another B, then A may be diluted with more
than 1000 times its volume of some liquid, which has no surface ten-
sion with B, before it loses the property of making spheres.

The most striking proof, however, that the formation of the rings
does not depend on surface tension, is the fact that the rings are
formed when the liquid of which the drop is made is the same in all
respects as that into which it falls. If we take a vessel full of water,
and raise from it by means of glass tubing enough water to make a
drop, then, when this drop falls back again into the vessel from the
proper height, it forms a ring. After a little practice, it is easy to
distinguish the ring from the rest of the liquid, and this may be done .
still more easily if we mix some insoluble powder with the water.

Hxpervments with one Liquid.

We found on trying different liquids that they behaved very
differently when treated in the way we have just described. In some
of them a distinct ring was formed by the drop, whilst in others the

*
‘

424 Prof. J. J. Thomson and Mr. H. F. Newali. [Dee. 17,

drop after falling into the liquid seemed to spread through it without
assuming any definite shape. We found when we used various
liquids that if the drops were let fall under similar circumstances, the
results depended only on the value of n/p (the kinematic coefficient of
viscosity for the liquid). This is shown in the following table, where
the behaviour of the drop and the value of «/p are given for several
liquids, which we have divided into classes. The viscosity coefficient
zw has been determined by Poiseuille’s transpiration method; that is,
from the time in which a constant quantity of liquid flows under
constant pressure through a fine capillary tube. To test the character
of the rings formed in the case of any particular liquid, drops of it are
let fall into a column of it from three different heights: Ist, such
that the drop just touches the surface of the liquid column at the
moment it detaches itself from the tube; this height of fall is
denoted in the table by “ fall = 0”; 2nd, such that the tube is held
1 inch above the surface of the column; 3rd, such that the tube is
held 2 inch above the surface. In describing the character of the
rings we have used terms which it will be well to define. ‘“ Splash”
denotes the irregular spread of the drop through the liquid column ;
it takes place with whirls and eddies irregularly, and is difficult to
represent, but the figure (5) would probably recall the appearance to

Fie. 5.

one who had seen the reality. ‘“ Uncertain” expresses that a ring or
a splash is formed, one as often as the other. ‘‘ Blob”? denotes the
appearance of a drop that does not break and spread through the
column, but remains within its boundary; the figure (6) represents

Fite. 6.

cam

the case. ‘‘ Doubtful” denotes that the drop tends to become a ring,
but that it is a question whether it ever leaves the state of a blob.

425

On the Formation of Vortex Rings by Drops.

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VOL. XXXIX.

496 Prof:J. J. Thomson and Mr. H, F. News (aan

Notes.—(i.) Oleate of soda solution in water, wade of that streneee which best
gave certain results when a drop was let fall into a special sample of paraffin oil (see
below).

(ii.) Sulphuric acid III, a mixture of acid and water, made by adding water to
strong acid until drops taken from the mixture and let fall into it gave rings as good
as many of the liquids in Class II.

(iii.) Paraffin oil such as is ordinarily used in lamps.

(iv.) Glycerine II, a mixture of glycerine and water, dilute enough to bring it
only just into Class IT.

(v.) Sugar solution i in water, so strong as just to give rings when dropped into

itself.

(vi.) Paraffin oil II, a special sample of oil that we have not been able to match,
and which will be referred to below (p. 432).

(vii.) Sulphuric acid II, made of such strength that it should belong by the
character of its ring to Class IIT.

(viii.) Sulphuric acid I, strong commercial acid.

(ix.) Glycerine I, diluted with water, but still of such strength that rings were
never formed by drops of it falling into a column of it.

These experiments indicate that the nature of the motion, after the
drop has fallen into the liquid, depends upon the value of p/p. Now
p/p 1s a quantity of the dimensions of the product of a length and a
velocity, so that nothing can depend upon the absolute value of this
quantity, but only on the ratio of it to the product of some length
and velocity in the system. The most obvious length in aie
system with which p/p can be connected is the size of the drop or
ring. If this is so, diminishing the size of the drop when p/p is kept
constant ought to produce the same effect as increasing /p when the
size of the drop is kept constant. Now if we take a liquid from
Class I, the effect of increasing p/p sufficiently would be to make it
behave like one in Class II, that is, give very much better rings, so
that for a liquid of this kind we should expect that small drops would
make better rings than large ones. To test this, we repeated the ex-
periments with the liquids of Class I, using much smaller drops than
we used before, and we found that now they made rings much more
readily and certainly, in fact, with this sized drop, they deserved to
be put into Class IJ. If we try the same thing with liquids in
Class III, we find that the rings are worse with small drops than
with large. On the other hand, increasing the size of the drop when
n/p is kept constant, should have the same effect as diminishing p/p
when the size of the drop remains constant, so that if we repeat the
experiments with liquids from Class IV, using larger drops than
before, we should expect to get better rings. Hxperiment showed
this to be the case. Large drops were obtained by dipping a piece of
glass tubing into the liquid (e.g., strong sulphuric acid), and then
raising the tube after closing the top with the finger; on removing
the finger, a considerable quantity of liquid flows through the tube,
making a large ring. The velocity with which »/p would be most

1885. ] On the Formation of Vortex Rings by Drops. 427

naturally connected is the velocity of the drop; it is not possible,
however, to alter this very much without introducing great dis-
turbance into the liquid.

These results admit of very easy explanation, if our theory of the
formation of the rings is correct. According to this, the reason that
the liquids in Class I do not make rings, is because the vortex motion
has not penetrated sufficiently into the drop to make it break up,
when it becomes disk-shaped. If, however, the drops be made
smaller, the vortex motion has a better chance of filling it before it
becomes disk-shaped, and so causing it to break up into a ring.
When p/p is very large, as is the case for liquids of Class IV, the
vortex motion is dissipated so quickly, that though the drop may
have been filled with vortex motion, this has all diffused away before
the drop reaches the disk-stage. If we make the drop larger, it will
take longer to get full of vortex motion, and there may be enough left
in, by the time it gets disk-shaped, to cause it to break up into a ring.
There is another way in which the formation of rings by liquids of
Class IV may be promoted: suppose that, instead of letting a drop
fall into a column of the same liquid, we let it fall into another
liquid for which u/p is smaller; then since this liquid is a worse
conductor of vortex motion than the drop, the vortex motion will not
diffuse so readily into the surrounding liquid. Thus we should
expect the drop to form a ring more readily than before; and we
have found this to be the case. Thus, for example, drops of sul-
phuric acid I from Class IV, let fall into either sulphuric acid II of
Class III or sulphuric acid III of Class IJ, give rings. Similarly
with solutions of sugar, of caustic potash, and of glycerine.

These effects are sometimes masked by the effects produced by
difference of density ; for if the drop is much heavier than the liquid
into which it falls, it will fall faster, and this will promote the
formation of the ring. If we guard against this source of error, we
may see that if a drop does not make rings when it falls intoa column
of the same liquid, it will not make rings when it falls into a column
of another liquid of the same density, but for which p/p is greater ;
but it may make rings if p/p be less than for the drop.

On the Splitting up of the Rings.

When a ring has travelled some little distance through the liquid,
its outline generally becomes irregular, and after a time takes the
corrugated appearance shown in fig. 1. The corrugations become
more and more marked as the ring falls, until the appearance is that
represented in fig. 8, y: the drops at the bottom of the bends develop
rings in the same way as the ring itself was originally developed.
This process of subdivision is repeated several times, until the ring
assumes the appearance shown in fig. 7.

2B) 2

428 Prof. J. J. Thomson and Mr. H. F Newall. [Dec. 17,

The separate rings always remain connected with each other by
threads of liquid; this shows that there is no surface tension; for if
there were, these threads would break up into drops. The only
stage at which the motion is discontinuous is when the drops are
changed into rings. The change from the ring shape to stage 2
(fig. 1) occurs quite gradually, and there is nothing analogous to the
separation which takes place when a cylinder of liquid splits up into
drops. We have made a great many experiments on the subject, and
have arrived at the conclusion that two conditions are necessary for
the splitting up of the rings.

1. The liquid forming the ring must be of density different from
that of the liquid into which it falls.

2. There must be motion in the liquid into which the drop falls.

We suppose that the splitting up takes place in the following way.
In consequence of the motion in the column of liquid the ring gets a
little uneven, more of the liquid collecting in one part of the ring
than another. Now, if there is plenty of vortex motion in the ring,
this irregularity will not be permanent, as the anchor ring with
uniform cross section is the stable form for the motion, so that unless
the disturbing force is too great, the ring will oscillate about the
anchor-ring shape, and the irregularity will not increase. If, however,
the vortex motion in the ring be small, it may not be able to balance
the disturbing forces and the irregularities will increase. The dis-
turbance is-due to the resistance of the liquid in the column, the
places where the liquid in the ring has collected falling faster than the
remaining portions of the ring; the ring consequently takes in time
some such appearance as that shown in fig. 8 (yand 6). The thicker
portions will behave now as the drop did when it fell into the column,
and they will develop rings in just the same way.

1885. | On the Formation of Vortex Rings by Drops. 429

Fie. 8.

The observations on which we base these conclusions are the
following :—

We have never seen a ring break up when the liquid forming the
ring was the same in all respects as that surrounding it. If the
temperature of the drop be different from that of the column, or if so
much powder has been added to the drop as to make the difference of
the density appreciable, there is breaking up.

The number and size of rings into which the original ring breaks,
and their manner of distribution round its circumference, are quite
irregular.

430 Prof. J. J. Thomson and Mr. H. F. Newall. [Dec. 17,

When the liquid into which the drop falls has been ailowed to rest
for some hours, a ring will go much further and will last much
longer without splitting up, than when it follows on a succession of
rings. Some rings of very dilute permanganate have thus been ob-
served to last for as long as ten minutes.

When there is little difference in the density of the drop and the
liquid into which it falls, the ring does not break up until there is no
vortex motion in it.

When, however, the difference in density is large, the ring may
break up while it is still rotating.

If a tube be drawn out into a fine capillary and be filled with sul-
phuric acid, and held so that its capillary end is just beneath the
surface of a column of water, a fine stream of acid flows down; and
ou it marked beadings appear. Hach bead gives rise to a vortex ring,
and the rings so formed behave in characteristic manner (fig. 9.)

Fi@4. 9.

Here there seems strong evidence of a tension between the acid and
the water, but the appearances are to be explained by differences of
velocity in the stream, brought about by motion in the column of

1885. | On the Formation of Vortex Rings by Drops. 431

water, or by vibrations communicated to the capillary tube. If the
experiment be made with all care to avoid vibration, the stream falls
unbroken through a column of 8 inches of water: whilst if a tap
be given to the acid tube a break occurs in the stream, in consequence
of a momentary stop in the flow of acid, a small bead is formed, and
from it aring. If no care is taken to avoid vibration the beads will
follow one another very rapidly. It may be objected that if there
existed a surface tension, it would only be when disturbances were
communicated that beadings would appear. But in such a case, the
resolution into drops would be complete, and small spherules would
be formed between the larger drops. In fact, however, the con-
nexions between the beadings are fine filaments of acid, so that the
beadings are never really separated from one another. We have,
moreover, convinced ourselves of the correctness of this explanation,
by allowing a stream of cold water with lycopodium powder to flow
from a fine tube into a column of slightly warm water; similar cessa-
tions in flow and formations of beadings may be observed; the rings
are not well formed, but this is to be expected, for the conditions are
not nearly so favourable.

Huperiments with two Liquids between which there is Tension.

When there is a very small tension between the liquid of the drop
and that in the column, some very interesting results are obtained.
In a few cases a ring is formed for a moment, but is almost imme-
diately broken up into drops and spherules. As instances of such
cases we may mention strong caustic potash solution dropped into
paraffin oil: strong sulphuric dropped into turpentine or into paraffin
oil: a certain mixture of turpentine and alcohol dropped into parafiin
oil: a mixture of alcohol and chloroform dropped into water: and
the mixture of alcohol and a few drops of water dropped into benzene
(see above, p. 423). In most cases the drop falls through the liquid
shaped like a disk, and in the first part of its course changes its shape
very considerably. These changes may be well observed in the case
of a drop of sodium sulphate solution falling through paraffin oil;
they are shown in fig. 10.

At first the drop is nearly spherical (a) ; then it becomes flattened
(8); next it becomes quite flat underneath or sometimes even hollow
(y), the top remaining curved. During all this time the velocity of
the drop has been changing. The top now gets flatter and flatter
(6, «, €), while it begins to bulge out at the bottom till the drop is
saucer-shaped (y, @), hollow at the top, and rounded at the bottom, and
we perceive that itis followed close on by a vortex ring in the liquid of
the column. It now moves with constant velocity through the liquid
as though it met with no resistance, differing in this respect from the
case where the drop falls as a ring, when its velocity—unless th

432 Prot. J. J. Thomson and Mr. H. F. Newall. [Dec. 17,

Fig. 10.

difference of density is very great—continually diminishes. We see
the reason for this to be that the vortex at the back of the disk since
it tends to make the liquid move along its stream lines, will increase
the pressure in the rear and thus diminish the resistance. In fact we
see that what the vortex does is to make the conditions very much
the same as if the saucer-shaped drop were moving in a stream
flowing with the same velocity. The existence of the following vortex
is shown in a very beautiful manner in the next stages represented at
e and « in the figure: the edges of the saucer-shaped disk become
thinned out to such an extent by the action of the radial streams above
and below, that they are drawn out into fine filaments which imme-
diately break up into small spherules, and these are carried round in
the vortex behind the drop.

These latter stages are best shown in the case of a certain solution
of oleate of soda let fall into a special sample of paraffin referred to
above (p. 426), and the changes are represented in fig. 11.

If only a small drop of oleate is let fall, the steady state is reached
before the spherules are detached, and the drop falls in the shape
shown ata. Ifa slightly larger drop falls, then the form b is reached,

1885. | On the Formation of Vortex Rings by Drops. 433

Fie. 11.

Oate of Seda into special Furaffin Ore.

and persists until so much of the drop has been whirled off into the
following vortex that the form a is reached again, and the velocity
of fall never attains such a value as to bring about the thinning out
of the edges. If a still larger drop is let fall, the forms C,, Cy, and Cs,
are assumed, in which the thin cylindrical part at the edge is at first
vibrating up and down, until the steady phase, C3, is reached: this
will by degrees be reduced to the form b, but the column of paraffin
was not long enough for us to observe the final form a. Ifa still
larger drop of oleate is used, the vibrations of the cylindrical part, d,
are so great that the drop is torn asunder and such disturbance is
produced in the column that a steady fall is not attaimed. These
results may be obtained by increasing the strength of the oleate
solution and keeping the size of the drop constant.

One more case of interest may be described, namely, that of drops

434 Prof. J. J. Thomson and Mr. H. F. Newall. [Dec. 17,

of carbonate of soda dropped into paraffin oil. The phases are repre-
sented in fig. 12. The earlier ones are somewhat similar to those
above described. But the phase shown at e is different. Here it
seems quite a chance, as it were, that the disk does not break into a
ring. The instability is immediately shown by the oscillations, which
begin at this point and continue in a regular manner through a fall
of more than 3 feet. An attempt is made to show this in the
phases ¢, 7, 06. A thickening appears at one side, and the opposite
edge thins off considerably, and these irregularities travel regularly
round the drop as it falls through the column.

Hffect of the Height of Fall on the Formation of the Ring.

We have found that alteration of the height from which a drop falls
before reaching the surface of the column modifies the formation of

Fia. 12.

the rings considerably. Good rings are formed only within small
limits of height—from about 1 to 3 inches, according to the size of the
drop. Above 3 inches it is only when the drop falls back into the
column after rebound that a ring is formed, and that very irregularly.
But within the limits for any particular size of drop rings are much

1885. | On the Formation of Vortex Rings by Drops. 435

better formed from some heights than from others. We have observed
many cases, varying the size of the drop, the liquid of which it is
composed, and the tension of the surface, and have found that the
variations in goodness of the rings—where goodness is judged by the
length of path in the liquid—depend on the variations in the shape of
the drop at the moment it touches the surface. Curves were plotted
out, abscissee being taken equal to the height of fall, and ordinates
equal to the depth to which the ring goes without breaking up. The
curves show two or more maximum points: the abscissa values for
these differ from one another by lengths which may be reduced to time
intervals. We find that there is very fair agreement between the
intervals so calculated and the periods of vibration of the drop about
the spherical form. With small drops of water there are several
maxima close together, but more widely separated as the fall gets
longer (fig. 13). The eqnivalent intervals are about ~: of a second,

BiG bo:

Flerght of foul of Prop ev Azer.
Drops 2 Ji itne Ata.

a
N
S
aa
e
>
s
N
RX
>
RN
%
©
yy
N

whilst the period of vibration of a drop of the size used is about
ss of a second. With as large drops as can be formed from a tube
there are only two maxima separated by an interval equivalent to 3'5

436 Presents. [Dee. 17,

of asecond. The period of vibration of such a drop was calculated
to be =, of a second.

The effect of diminishing the tension would he to increase the
period of vibration. In experiment we have observed that the separa-
tion of the maxima is much greater in the cases of paraffin and of
turpentine and of alcohol. But difficulties were experienced in the
fact that drops of these liquids when let fall from small heights up
to about half an inch, generally assumed the spheroidal state. Hqual
drops of water and of weak oleate of soda solution were let fall into
water, and it was found that the separation of maxima was nearly
twice as great for the oleate as for the pure water.

In the case of large drops, drops let fall from a point midway
between the points to which maxima correspond are nearly always
broken up without the formation of a ring. In the case of small
drops rings are nearly always formed, but the depth of their paths in
the liquid varies from about half an inch to 5 inches.

VI. “A Preliminary Account of a Research into the Nature of
the Venom of the Indian Cobra (Naja tripudians). By
R. Norris WOouLFENDEN, M.D. Cantab. (from the Physio-
logical Laboratory, University College, London). Commu-
nicated by E. A. SCHAFER, F'.R.S. Received November 17,
1885.

The Society adjourned over the Christmas Recess to Thursday,
January 7th, 1886.

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Washington 1885. The Office.

Abel (Sir F.), F.R.S. Address delivered November 18, 1885, before
the Society of Arts. 8vo. London. The Author.

Caruel (T.) Flora Italiana. Vol. VI. Parte 2. 8vo. Firenze 1885.

Botanical Museum, Florence.

Gill (David), F.R.S. Catalogue of 4,810 stars for the epoch 1850.
Svo. London [1884]. The Greenwich Observatory.

Gould (Dr. B. A.) Addresses at the Complimentary Dinner to. 8vo.
Injnn, Mass. 1885.

Hirn (G.-A.) L’Avenir du Dynamisme dans les Sciences Physiques.
Ato. Parts 1886. Recherches expérimentales et analytiques sur
les Lois de Ecoulement et du Choc des Gaz en Fonction de la
Température. 4to. Paris 1886. The Author.

Kirkman (Rev. T. P.), F.R.S. On the Enumeration and Construc-
tion of Polyedra, &c. 8vo. [1883]. Of Knots of fewer than Ten

Crossings. 4to. [1884]. The Author.
Marcet (W.), F.R.S. Address at the Leicester Congress of the
Sanitary Institute of Great Britain. 8vo. 1885. The Author.
Marsh (O. C.) Dinocerata, a Monograph of an extinct order of
gigantic Mammals. 4to. Washington 1884. The Author.
Pritchard (Prof. C.), F.R.S. On the Relative Proper Motions of 40
Stars in the Pleiades. 4to. London 1885. The Author.

Quain (R.), F.R.S. The Healing Art in its Historic and Prophetic

Aspects (Harveian Oration). 8vo. London 1885. The Author.

Schafer (Prof. HB. A.), F.R.S. Introductory Address on Medical

Education, delivered at University College.. 8vo. [ London] 1885.

The Author.

Thompson (D’Arcy W.) A Bibliography of Protozoa, Sponges,
Coelenterata, and Worms. 1861-83. 8vo. Cambridge 1885.

University Press, Cambridge.

Thomsen (Julius) Thermochemische Untersuchungen. Band IV.

8vo. Leipzig 1886. The Author.

Influence of Labour upon the Discharge of Nitrogen, 443

“The Influence of Bodily Labour upon the Discharge of
Nitrogen.” By W. Nortu, B.A., F.C.S. Communicated |
by J. BURDON SANDERSON, F.R.S. Received October 29,
1883. Read November 15.

[PuLaTEs. 5—10.]

As in the experimental researches previously published on the sub-
ject of the present paper, the methods employed have been for the
most part entirely different from those which I have found best
adapted to the purpose, 1 have after much consideration judged it
inexpedient to lengthen an already long communication by giving an
account of them.

The scope of my inquiry has been strictly limited to one question,
viz., that of the influence of labour in modifying the normal relation
between food and excreta. I have made no attempt to investigate the
mode in which nitrogenous products came into existence in the
organism.

The only published experiments of any importance which bear
strictly on the subject of inquiry are those of Dr. Parkes,* contributed
to the Royal Society in 1867 and 1871, and those of Dr. Austin Flint,
on the pedestrian Weston, 1871.+ The results of these two investi-
gations were as follows :—

Dr. Parkes found that during or immediately after severe labour,
the discharge of nitrogen was more or less increased; the increase,
however, was so inconsiderable that it might well be questioned
whether it could not be accounted for as dependent on the more
perfect absorption of food, for although the diet of the soldiers
experimented upon was carefully regulated, and the nitrogen it con-
tained determined by analysis, with the result that before work the
quantity of nitrogen taken in considerably exceeded the quantity
discharged, the two became practically equal during the work period,
consequently if the whole period of observation is taken into account,
the nitrogen discharged is found to be more than balanced by that of
the food.

Dr. Austin Flint, on the other hand, found that over the period of .
work the increase of discharge was so large that no such explana-
tion appeared to him admissible; if, however, comparison is made
of the intake with the output of nitrogen during the whole time of
observation, comprising the three periods of five days each before,
during, and after labour, it is found that the two are unequal, the

* “On the Elimination of Nitrogen during Rest and Exercise on a Regulated
Diet,” ‘Proc. Roy. Soc.,” vol. 15, p. 339, vol. 16, p. 44, 1867 ; vol. 20, p. 402, 1871.
t+ “ New York Medical Journal,’ June 1871, p. 609.
2Ga2

4440 Mr. W. North. The Influence of

difference in favour of the nitrogen of the food amounting to
217 grains in a total of 5075.

These results were subjected to careful experimental criticism in
1876,* by Dr. Pavy, who showed as the result of his own analyses
that the immediate effect of labour in increasing the nitrogen output
of the body is more than compensated by the concomitant and sub-
sequent intake.

It is further to be considered that whatever results had been obtained
by Dr. Austin Flint, they could not have been received without some
misgiving, for his methods of research were insufficient as bases for
quantitative statement ; thus the nitrogen of the urine was throughout
determined by a process which is known to be hable to errors of
variable amount, which no care on the part of the worker is adequate
to guard against. So also as regards the intake of nitrogen. Dr. Flint’s
estimates were for the most part founded, not on analyses of the
material actually used, but on calculations based on the percentages
given in M. Payen’s tables,t percentages which are known to be at
best only approximately correct ; moreover, the diet of Weston was of so
complicated and variable a composition, that even if each constituent
had been analysed, the result would still have been open to question.

The circumstances under which Dr. Austin Flmt had to make his
observations probably made it impossible for him even to attempt to
secure uniformity of diet. In this respect the conditions of Dr. Parkes’
experiments were immeasurably superior; fully recognising that
uniformity was essential, he fed his men in the simplest possible way.
He was not, however, able to accomplish this without employing a
diet which was so different from that to which as soldiers they were
accustomed that, however satisfactory its elementary composition
might be, it could scarcely be considered as natural.

Notwithstanding this difficulty, the experiments of Dr. Parkes
render it, to say the least, highly probable that the immediate effect of
labour is to increase the discharge of nitrogen, they leave it undecided
whether or not this increase occurs at the expense of stored material
independent of any concomitant or subsequent increase of intake.

If this be so, the results of experiments conducted under natural
conditions and by perfectly accurate methods, ought to show that if
the nitrogen output were graphically represented during the course of
it by a curve, in the construction of which the quantity of nitrogen in
the food was taken as base line or axis, the part of such output curve
corresponding to the previous period would be a more or less horizontal
line below the level of the axis. That corresponding to the period
during or immediately following work will show an elevation, followed
by a depression of less amplitude but longer duration, corresponding

* “Tancet,” 1876, vols. i and ii.
t+ ‘“Traité des Substances Alimentaires,” Paris, 1865.

Bodily Labour upon the Discharge of Nitrogen. 445

to the subsequent period, and the form of the curve would be such
that of the two spaces included between it and the axis, the one
above would never exceed the one below, provided the period of obser-
vation were sufficiently prolonged. It has been a primary object of
the present inquiry to determine whether a result in this form can be
invariably obtained or not; its value, if obtained, would lie, not of
course in its affording evidence that increased expenditure of nitrogen,
consequent on work, is balanced by diminished expenditure afterwards
(for this has been already shown, and has in itself very little signifi-
cance), but in its proving that the increase is not and cannot be an
effect of increased intake, that the over-expenditure of nitrogenous
material which work determines is exclusively expenditure of pre-
viously stored material, and consequently that the degree of effect
produced by work will vary according to the state of the body in
respect of storage at the time at which the work is done.

The subject-matter of the present paper will for the sake of clear-
ness be discussed under the following heads :—

(1.) Plan of Experiment.

(2.) Observations on Palse, Temperature, Respiration, and Body-
Weight, before, during, and after work.

(3.) Experimental Diet.

(4.) Methods of Collecting Excreta.

(5.) Methods of Analysis of Food and Excreta.

(6.) Nature of the Work done.

(7.) Detailed Statement and General Summary of the Quantitative
Results of Experiments.

In the concluding paragraphs an attempt will be made to set forth
the inferences to which the experiments lead, and to indicate the direc-
tion which must be given to further inquiry.

The Plan of Hxperiment.

I always began an experiment with the intention that it should
extend over at least nine days, which I divided as follows:
days’ ordinary occupation, one day work, and a second period of four
days’ ordinary Occupation, or more if I thought it necessary for the
complete subsidence of any effects produced by the work. In addition
to this I usually prepared myself some days (ten or twelve) before,
by living exceedingly regularly, and always having the same kind,
and as nearly as possible, without weighing, the same quantity of
food ; further, in order to get rid of what in a former paper* I have
called reserve nitrogen, I have found it necessary somewhat to increase
my daily exercise for a few days before commencing an experiment,
or, as in my later investigations, to take the additional precaution of

* “ Journal of Physiology,” vol. i.

446 Mr. W. North. The Influence of

abstaining from food for thirty-six hours. Judged by the results,
this seems to bring about the desired effect more rapidly and with
ereater certainty than increased exercise, and has the advantage of
not causing such great systemic disturbance—at least in my own case.

In the paper above referred to I have stated my belief as the result
of experiment in the possibility of storing in the body a certain
amount of nitrogen, which, when occasion arises, is discharged again,
and I found in these experiments that my mode of life, and particu-
larly the amount of food which I had been taking in the previous
week, materially influenced the effect produced by the inanition:
that is to say, that in the one case, in which I had not been living up
to my usual standard of diet for some little time before the fast com-
menced, the nitrogen curve began to descend immediately and very
rapidly to its minimum; whereas in the second, in which the reverse
condition pertained, that is to say, when for a week before the experi-
ment I had been living somewhat more generously than usual, the
nitrogen curve descended more slowly, and the general effect of the
starvation upon me was very much less; I would lay particular stress
upon these facts, although beyond the use of the term “store nitro-
gen,” I have attempted no explanation of them, because they will be
found to havea very important bearing upon the results of the experi-
ments which form the subject of this paper. _

Having thus, in one way or the other, 7.e., either by starvation or
increased exercise and regulated diet, prepared myself, I put myself
upon the special experimental diet, going about my work, and living
just as usual, except that my meal-times and the quantity of food
taken daily were regulated with great exactness.

In the earlier experiments I performed the whole of the analyses
myself, and in all I have personally weighed, prepared, and cooked
every article of my diet.

The analyses of food, urine, and feeces, made in 1882 and 1883,
were made for me by a skilled assistant, and I may take this oppor-
tunity to remark, that with my present mode of experiment, the labour
involved is so great as to render it quite impossible for any one to be
at the same time the subject of the experiment and the analyst, apart
from the fact that for many reasons it is very undesirable.

Observations on Pulse, Temperature, Respiration, and Body- Weight.

These were made regularly twice a day, immediately on waking in
the morning, and just before going to bed at night.

The Pulse—The observations were made in two positions, standing
and lying, the difference between the two being, I think, a fair index
of the condition of the nervous system. The morning observation
was made immediately on waking, and before any movements had

Bodily Labour upon the Discharge of Nitrogen. AAT

been made which might excite the heart. The standing observation
‘was made by getting out of bed as quietly as possible, and standing
upright for two or three minutes, during which I counted my pulse,
until I found that the quickening produced by the movement had sub-
sided. I then made the observation, often repeating it two or three
times. At night I remained standing for five or six minutes before
counting the pulse, and on lying down the same precaution was
observed.

Respiration.—Observations in the two positions were also made
morning and evening, the same care being taken to ensure accuracy.

I found it was not by any means an easy matter to count the respi-
ration without affecting its rate by the very act of doing so. The
plan eventually adopted was to stand with my watch in my left hand,
and my left wrist lightly pressing against the lower ribs; with a little
practice I was able in this way to count the respirations almost
unconsciously. The figures given in the tables are as a rule the
mean of at least two observations.

Temperature.—This was observed by means of a pair of clinical
thermometers, which had been carefully compared, and found to read
accurately together. The figures all indicate Fahrenheit degrees, and
are something less than one-tenth of a degree too high; this being the
error of the instruments, no readings were taken under five minutes,
and most of them were over ten. I previously found by careful
experiment that three minutes would suffice for either of the ther-
mometers to attain the maximum temperature.

The observations were taken in the mouth and axilla, great care
being taken to secure the proper position of the instruments; any
doubtful observations were always repeated. I occasionally also took
the temperature of the rectum. Besides the morning and evening
observations, I took the temperature of the mouth frequently during
the exercise and at other times, when for some reason or another I
have thought it desirable to do so. The exact times at which all these
observations were made, together with notes on any which seemed to
require explanation, will be found recorded in the tables.

The Body-Weight.—This was taken morning and evening on an
Avery’s machine, weighing to ounces. On the days of exercise I
made two additional observations, one just before starting, and another
on returning.

There are several points connected with the accurate determination
of the body-weight which are of very great importance in all investi-
gations of this kind, and which may not be out of place here.

There is of course no difficulty whatever in determining the body-
weight at any given time, but I have learned from long experience
that it is not so easy to make what I may call a “ fair” observation.
It will be obvious from an inspection of the tables that the variations

448 | Mr. W. North. The Influence of

of my own body-weight were often very considerable, and this is
especially the case between the evening weight and that of the follow-
ing morning ; variations during the day may be very largely due to
food and drink, particularly the latter. This loss of weight during
sleep is due to two causes, loss by the skin and lungs, and loss by the
kidneys, as I always emptied the bladder before: taking my weight.
Making all allowance for the urine, it is clear that whilst sleeping
I frequently lost 1 to 1} Ibs.. in weight, and on some occasions even
more, by the skin and lungs alone. During the day I have frequently
observed even greater loss from this cause.

The object of frequent and regular observations of the body-weight
in all investigations of this kind is. to determine whether or no there
exists a relation between loss of tissue and discharge of nitrogen..
The weight of proteid which would represent the greatest increase in
the nitrogen discharge I have ever observed is very small compared:
with the variation of body-weight from other causes, and is very
liable to be overshadowed by them, if indeed we ought to consider
ourselves in any degree capable of distinguishing between the two.

There are a number of circumstances which affect the body-weight,
and which I think it would be well briefly to consider:. They may be
divided roughly into two categories, external and internal..

Eaternal Conditions.—The condition of the atmosphere, height of
the barometer, external temperature, and the nature of one’s occu-
pation.

It is a matter of common observation that the amount of sensible
perspiration varies very materially with meteorological conditions,
and I have good reason for believing that not merely the sensible
perspiration is affected, but also indirectly the total loss through the
skin.

Speaking for myself, and I have often heard the same remark made
by others accustomed to severe physical exertion, a low barometer
and the depressing conditions which so often accompany it pro-
foundly influence the effect of such exertion upon the body-weight; I
can only suppose that this is due to the mental effect produced
reacting on the vasomotor system. Nor is this all. I think that
there is evidence in the results of my experiments, that this effect
manifests itself in another way,* which unfortunately seriously com-
plicates the problem I have set before me for solution. This vaso-
motor action affects the blood supply not merely of the skin, but also
of the internal organs, and especially the kidneys, causing not only a
great increase in the quantity of urine, but also an increase of
excretory activity, which has for result an incontestable increase in |
the amount of nitrogen in the urine. This makes it exceedingly
important in estimating the value of results obtained to take very

* E. Smith: “Health and Disease,” 1875, p. 157..

Bodily Labour upon the Discharge of Nitrogen. 449

carefully into consideration all these conditions which directly or
indirectly affect not only the quantity, but the quality of the urine.

Internal Conditions——These are very various, and hardly admit of
accurate scientific description. There is, however, a phrase the
meaning of which is well known to athletes, viz., “to feel fit,” which
will serve to illustrate my meaning. I have observed repeatedly that
when I have undergone any considerable physical exertion for which
at the outset I did not feel this “ fitness,” or, to use another phrase,
when I was ‘“‘out of condition,” there was: invariably a much greater
loss of weight than when I was “in good condition.”

No doubt atmospheric conditions have a very powerful influence
for or against this “fitness” for exertion, but independently of these
are mental and nervous states probably exceedingly complicated i
their origin, but none the less powerful in the influence they have
upon the metabolic phenomena of the body.

The body-weight in these experiments was always taken after
emptying the bladder, so that the difference between the evening
weight and the weight next morning expresses the total loss: by skin
and kidneys. I attempted to eliminate the error caused by the con-
tents of the rectum, but very soon found that it was impossible to
regulate and control the bowels with the same precision with which
the urine can be regulated; so that if we wish very accurately to
determine the significance of these differences of body-weight, we
must take careful note of the times at which the feces were passed,
but for reasons which will be stated. under the head of the feces the
difficulty is only then very partially overcome. Enough has I think
been said to show how exceedingly difficult it may be to determine
with even moderate accuracy the nature of the loss or gain in body-
weight, and how careful we should be in accepting arguments founded
on small variations.

Daily Occupation, Meals, §c.—The day generally began about 9 a.m. ;
the variations from this time will be found in the tables of tempe-
rature. Breakfast followed as soon as I could prepare it. I had no
mid-day meal, but was accustomed to take a portion of the bread to
the laboratory at University College, in which most of my time was
spent. I dined at or about 6 P.m., and spent the evening in reading,
weighing and preparing food, &c. The necessities of my work some-
times kept me up very late. This was unavoidable, as I was not
able to devote my whole time to these experiments. At first I used
to bake my bread every evening for the following day; but in the
later experiments I gave up every alternate evening to this work, as
I found I saved time by the arrangement, Supper was taken at
various times after 11 p.m.

Arrangements on Days of Hxercise—Under ordinary circumstances,
that is to say, when the walk could be easily accomplished between

450 . Mr. W. North. The Influence of

the breakfast and dinner hour, or at the most an hour or so later,
the exercise did not entail any material alteration in the ‘arrange-
ments already described; but when the distance to be walked ex-
ceeded 30 miles, the time required for its performance was too
great to admit of even approximate adherence to the rules as to
meal-times, &c., described in the previous section. For instance, on
the occasion when the distance to be walked was close upon 50
miles, it was necessary to go some little distance by train as usual, in
order to get out of London before commencing the march. This
involved getting up at 4 a.m., breakfasting before I started, and
walking to a railway station to catch a train, so that I might be on
my road by 6 a.m. I did not return perhaps until 8 P.M. or even
later, my sole food during the journey being one-half of my daily
allowance of bread.

Before starting I had the following operations to perform :—Obser-
vations on pulse, temperature and body-weight naked, and body-
weight when fully equipped for the journey, in order that I might be
able to estimate the load carried. After this I had to prepare and
eat my breakfast and put on my kit again before I could start. On
returning my first duty was to weigh myself ‘‘all standing” and then
naked; the differences between these observations and those taken
in the morning gave me the actual loss of weight sustained and the
mean load carried, because, as I need hardly point .out, the load
brought back is somewhat differently constituted from that taken out
in the morning, being lighter by the weight of bread consumed and
heavier by the urine and feces brought back.

Having made these observatious on my body-weight, I took my
pulse, temperature, and respiration, at all events in the standing posi-
tion, had a cold bath, after which I sometimes made further obser-
vations on pulse and temperature, and then prepared my dinner, of
which by this time I was generally greatly in need. On the days of
exercise I always combined dinner and supper, so that at the latest
the last ingestion of food for the day was certainly not later than
usual, and often an hour or two earlier.

During the actual progress of the walk, I pogeediy observed my
pulse, temperature, respiration, the length of my stride, and average
pace.

I have thought it necessary to state thus explicitly my manner of
proceeding on a day of exercise, because it may possibly be urged
that the results I have obtained may be thus accounted for; that is
to say, it may be urged that whereas an ordinary day was one of
twenty-four hours, the day of exercise was on two occasions at all
events longer by four hours, and the day before the exercise was
shortened by the same amount. I am obliged to admit a certain
amount of justice in this objection, but I would urge, on the other

Bodily Labour upon the Discharge of Nitrogen. 451

hand, that I was careful always to dine rather earlier on the day
before the exercise, and to consume all my remaining bread at that
meal, leaving only a cup of cocoa to be taken later to complete the
day’s allowance, and this I generally took between 8 and 9 P.m.,
instead of at 11 p.m. as on other days; so that I think I may safely
say that my food had at least the usual time for digestion and the
products to pass into the urine. .

It may possibly be asked, why I did not adhere to my ordinary
meal times and arrange for the consumption of my dinner on the
road? I would reply, that the object of these experiments was to
determine the effect of muscular labour upon the nitrogen contained
in the body, and not the disposition of material supplied to the
organism whilst in a state of great activity. This I consider to be a
different problem from the one actually before us, and which will
require investigation by somewhat different methods from those
which I have adopted in these researches. True I have found it
necessary to eat something during the work, but this was only the
same as was eaten on other days on which no work was done. _

The Diet.—In all experiments of this kind, the diet is of prime
importance. Our ordinary food-stuffs do not lend themselves readily
to analysis, are very variable in their composition, and are in many
respects very unsuited to the purpose.

The conditions which the diet for such researches must satisfy are
these :—

(1.) It must be of such a nature as to resemble as nearly as pos-
sible the ordinary food of the individual experimented upon.

(2.) It must admit of being accurately sampled for analysis.

(3.) It must keep for such a length of time that one experiment at
least can be made with the same material.

The ordinary components of a mixed diet do not satisfy the last
two conditions in any sense whatsoever, and the extreme difficulty of
determining the ingesta accurately led me, after many trials, to use
special methods of preparing the following articles for the purposes
of these researches :—

Bread.

Meat.

Green vegetables.
Potatoes.

Milk.

Fat.

Apples.

Cocoa.

Bread.—In order to secure perfect uniformity in the quantity and
quality of this article, I took a sufficiency of one sample of flour to

452 Mr. W. North. The Injluence of

last for several experiments, and this was weighed out into paper
bags in quantities sufficient for each day’s consumption, an allowance
of 10 grams on each day’s quantity being made for loss in the
process of making. This figure was arrived at by actual experiment.
It will be obvious that by this method, the bread being always made
in the same way and from precisely the same quantities of the same
ingredients, analysis of the flour was sufficient to determine the daily
quantity of each constituent, the weight of the bread itself being
quite immaterial. I may add that it was raised by means of bicar-
bonate of soda and tartaric acid, and baked in tins to avoid possible
loss in the process, and that the greatest care was taken to ensure the

consumption of the whole daily quantity by keeping it in paper ee
so that no crumbs were lost.

In this way I secured absolute uniformity as regards bread.

Meat.—The difficulties to be evercome in order that the meat might
be made to fulfil the conditions already laid down were much more
serious than in the case of bread. They were, however, successfully
met by my friend Mr. Stephen Darby, of Leadenhall Street, to whom
I would here express my great obligation for the service he has ren-
dered me in this matter. The process of preparation is briefly this :—

A large quantity, 80: to 100 lbs. of selected lean beefsteak, was
carefully freed from all obvious fat, tendon, &c., cut into pieces about
the size of a Barcelona nut, and dried upon a steam floor for some
time, then cut into still smaller pieces and dried again, and the pro-
cess repeated until the material was dry enough to be finely ground
inamill. The resulting powder was exceedingly dry, of about the
consistency of building sand, practically insoluble in water even
after very prolonged boiling, but readily attacked by very dilute
hydrochloric acid (0°2 per cent.), and apparently very easy of diges-
tion.

I found that the insolubility of the material somewhat interfered
with the palatability of the soup made from it (in which form it was
always taken but by the addition of vegetables and seasoning). This
difficulty was surmounted, as was also another, viz., that the powder
would not remain in suspension unless something were added to
thicken the soup. It will be obvious that this meat powder fulfils
the required condition almost perfectly. It will keep almost inde-
finitely (I have used some recently which was made nearly four years
ago). It is of uniform composition, and can be very readily analysed
—one analysis therefore sufficing for a very large number of expe-
riments.

Potatoes—There is no difficulty as to these, “‘ Edwards’ patent
desiccated potato” fulfilling every condition perfectly.

Green Vegetables.—These were for a long time a source of very
great trouble. At first I used ordinary fresh vegetable, which was

Bodily Labour upon the Discharge of Nitrogen. 453

very unsatisfactory. Nearly all the experiments recorded in this
paper have been made with what is known as “dried julienne,”
which, though in many respects greatly superior to fresh vegetable
for the purpose of these inquiries, in that it is possible to sample and
analyse it, fairly is open to the objection that it requires prolonged
soaking and careful cooking, otherwise it is exceedingly indigestible.

During the progress of the last experiment, Mr. Darby prepared
for me, at my suggestion, a quantity of vegetables of various kinds,
by thorough cooking, draining away the water, carefully drying the
residue, and reducing it to a very fine powder. The product is supe-
rior to the dry julienne in many respects. It is already cooked ; it
possesses much more flavour, and being in a fine powder, is very easily
digested. iI intend to use vegetables so prepared in all future expe-
riments.

Milk.—This presented no difficulty. I was informed by the makers
that a “‘case” of condensed milk was invariably the product of one
operation, and jn consequence the various tins in it would contain
milk of similar composition. Actual analysis showed this to be the
case. :

The milk was weighed in small tared beakers (50 grams in each),
the whole of the contents of a tin being weighed out at the same time,
in order that no change by evaporation might take place in the com-
position of the milk. When used, after scraping out as much as
possible with a spoon, I boiled the beaker in the water to be used for
making the cocoa, so that nothing was lost.

Cocoa.—I used Van Houten’s cocoa, because a small quantity suf-
fices, and when boiled with the condensed milk, diluted with water,
the “‘suspension” is perfect enough to enable the whole to be con-
sumed without loss. In this respect it is far superior for the purpose
to tea or coffee.

Fruit—I found throughout these experiments that fruit, in some
form or another, was almost a necessity and greatly contributed to
my comfort. I used for this purpose ‘‘ American evaporated apples,”
which contain no waste, are easily cooked, and exceedingly palatable.

Fats.—Prepared “ Australian beef marrow,” as sold in the shops,
suppled the fat I required ; it contained no nitrogen.

The other articles used, sugar, salt, tartaric acid, and carbonate of
soda (used for raising the bread), presented no difficulties what-
soever.

Composition of the Diet.
PMR TEE orcs late whe, ctatere s) se seee-e 410 grams.
pete: 2 el aayance bre a
Tartaric acid.... po each.. 7 eee
Carbonate of soda

454

Mr. W. North. The Injluence of
Condensed milk ...... .... 100 grams.

VB BS Fd 6 s055 Secou sb 4 bb 4s LOOM ips
Meat powder sige: oli ss a OO int
Preserved potatoes......... 60 ,,
Dited qulienne .- cil: as eus 2)? eee
Salt (for soup and potatoes). 10 ,,
Cocoa....- pt eRe: Ao Ossie
Preserved apples.........+. 2.0 ines

Sugar (powdered loaf) ..... 15 ,,

The distribution of the above articles into meals was as follows :—

PRRs haie cole te ro aneaite lelelvets 1:700 0°340 0-160
Dine wmVechouna oa oe cowiooo

Breakfast.
Cocoa*t te b.. Mes eeeiis ce) Se Rainas
Condensed milk ...........- Ox okies
JORG rh A aio Aaa ebiciditnere enctoineee a) ate

Bread, about 2 of the whole amount.

TIuncheon.

Bread, about + of the whole amount.

: Dinner.
Meat powder ..... Bictctielb Nye .. 60 grams.
JIMENMNE 45 ete ae CEES SORE 20 tok
POtahOES Baek Ae6 SEWN ieee Ee 60) Aes
Apples \ oe = be GRY eee 20a; is
SUA 5) Odea ueialie te. ta eeavee en eeE Loa
Sealitit g...cid Wage © ei piehine sede eae a or.
Pat abowbiee cs aes ce wey foe Diy
Bread, about + of the whole amount.

Supper.

Cocoa. ime cigeeuneen ae tad eee 5) grams
Conudensedianuilve peice. cae e)) seraibay
Breadiand dat cee bere ee The remainder.

Percentage Composition of Nitrogenous Food-stuffs used in

Experiments, 1882.

Food-stuff. Nitrogen.|. P,O;. H,SO,. NaCl. Ash.

oie 0°672
13°552 1°892 0° 630 0° 259 4310

Condensed milk ........ 1°474, 0:706 0°035 0°439 2:°110

Afredbivera lav stern Roe ROR CRE RMON ra ee

soeweoeoevere ee es © eo 6

1:725 0°811 0° 445 0°289 5° 382
0°961 0°492 0°210 O°511 3°412
3°162 2°122 ee 0°058 9°180

Bodily Labour upon the Discharge of Nitrogen. 455

Composition of Daily Ingesta.

Food-stuff. — Quantity.| Nitrogen.| P,Os. H.S0O,. NaCl.
grams.
REVOVE oaras aver eid eiess e76\<. evel-ea 400 6° 800 1°361 0:067
Diced meat) soi<ciee & a.e:eus.< 60 8°131 1°185 0:037 , 0°155
Condensed milk ........ 100 1:474, 0°706 0°355 0°439
PUM TRTUGW ae cvarg.ele os oe ¢6 20 0°345 0°162 0:089 0°057
OCA ON TE ata:Siovaree cB ea ales 60 0°576 0°295 0°126 0-306
(Hayek A eS eee eee 10 - 0°316 0° 212 a 0°005
Da Ee) Sek Ie ea ies 17° 643 3°872 0°675 0: 965

Preparation of Foods.—My method of preparing the soup, the chief
nitrogenous food of the day, was as follows:—20 grams of julienne
were weighed out the night before, and set aside in a dish, and covered
with about 250 c.c. of water to soak. By 6 p.m. on the following day
it was sufficiently soaked to be ready for cooking, and was then
poured into a saucepan, care being taken that none either of the
vegetable or water was lost. To this was added salt and dried meat
(60 grams), and the whole boiled for twenty minutes or half-an-hour,
and kept constantly stirred, so that nothing should adhere to the
sides of the saucepan, get burned, and so be lost. When snffi-
ciently cooked it was poured into the basin from which it was to be
eaten, and the saucepan carefully cleaned with a little boiling water,
which was then added to the soup. By these precautions I found no
difficulty in securing the consumption of the whole of the material.

The potatoes were cooked according to the directions given by the
makers, a small portion of fat being added. I found that when
properly cooked there was not the shghtest difficulty in removing
them from the saucepan completely.

The apples were stewed in the dish with the water in which they
were soaked, together with the 15 grams of sugar, and from this dish
they were eaten, so that nothing was lost.

Remarks on some Oonsiderations involved in the above Diet.

My diet during these experiments was compared with my ordinary
food, a very concentrated one, and on this ground alone it has been
suggested to me that it was very objectionable, and could not nourish
me in the same way as my ordinary food. To this I can only reply
that during the whole course of these experiments I enjoyed
exceedingly good health, and provided I was careful about my diet
for a few days after the conclusion of an experiment, I experienced
no ill effects whatsoever; on the contrary I have found on several
occasions that my general health was decidedly benefited by adopting

456 Mr. W. North. The Influence of

the diet, not for experimental but entirely personal reasons, and I
have often done so. All that has been done jto any of the articles
which comprise my diet table is to remove the great bulk of the water,
and that in such a way as to produce no alteration in the food-stuff,
except in form. I think the figures prove beyond a doubt that the
food was exceedingly well digested. The only fault I have to find
with it is that there is so little indigestible material in it, that it fre-
quently caused slight constipation and irregularity of the bowels,
which somewhat interfered with the exactness of the experiment.
The sensations experienced after a meal of dried meat and vegetables
are, I think, worth recording.

_ Immediately after the meal there was a sense of satisfaction ; this
was replaced in about an hour by a sense of hunger, someune very
marked; and this gradually disappeared and gave place to the con-
sciousness that an amply sufficient meal had been taken.

The Fluid Food.—Nothing in my experience is so difficult to regn-
late as the supply of fluids to the body during experiments of fis
kind. Variations of external temperature, and a number of minor
circumstances over which we have little or no control, lead to the con-
sumption of drinks of various kinds at irregular times, which no
doubt have a very considerable effect upon the constitution of the
urine, if not upon the general metabolism of the body. No doubt the
strict regulation of the fluids consumed would tend in some degree to
increase the accuracy of the experiment, but it would at the same time
cause an amount of discomfort to the individual experimented upon,
which would in many eases, I think, counterbalance the su ppaser gain
In accuracy.

Without any special effort on my part, I think I may say that my
fluid ingesta regulated themselves. The water used for making the
cocoa or the soup was practically a constant determined by the size of
the cooking vessels used. Besides the fluid thus taken, I think I shall
be near the truth if I say that on ordinary days a pint of water was
drunk. (No alcohol was taken in any form during these experiments,
and though I habitually take very little, it was my custom to abstain
entirely for several days before commencing an experiment. )

On the days of exercise there was undoubtedly an increase in the
fluids ingested, for I allowed myself three pints of soda-water during ~
the day, and on more than one occasion I have suffered considerable
distress from the apparent insufficiency of this allowance.

It is an accepted fact that under ordinary circumstances the inges-
tion of large quantities of fluid causes an increase in the nitrogen
eliminated by the urine, and possibly some of the increase which I
have observed on days of exercise may be due to this cause ; but con-
sidering the vast increase in the loss by the skin under such circum-
stances, I am inclined to regard the effect to be attributed to this

Bodily Labour upon the Discharge of Nitrogen. 457

cause as comparatively insignificant, and to consider the extra fluid so
taken as only serving to maintain the normal balance of fluids in the
body.

Method of Collecting the Excreta.

My unit of time, as before stated, was a period of twenty-four hours,
commencing immediately before breakfast each day ; the urine passed
in this period was therefore collected and mixed. For the collection
of the urine I used a pair of 40-0z. wide-mouthed stoppered bottles,
which for convenience of carriage, and in order that I might have
them always with me, were placed in a basket having a partition, and
the lid of which was secured by a padlock, to prevent interference
with the contents by other than myself or my assistant.

For the collection of the feeces I used flat-bottomed Bohemian glass
basins, about 2 inches deep, and 6 inches in diameter, with flat plates
ot glass for covers. These fitted into wooden boxes sufficiently stout
to protect the contents from breakage in travelling, the lids being
made to fit very closely, and secured almost hermetically by means of
four thumbscrews. The dishes and covers were all weighed most
carefully, and the weight scratched upon them with a diamond, and
the cases were made to fit so tightly that they might be carried in
any position without risk of losing the contents; these were used for
carrying the feces from my own rooms to the laboratory, and also
when on the march.

Mode of Collecting during Exercise.

As the exercise consisted of long pedestrian expeditions into the
country, I was obliged to adopt some means of carrying my receptacles
with me. The plan first used was to pack the urine bottles in felt
jackets, to prevent breakage in an ordinary tourist’s knapsack, the
stoppers being carefully greased, and tied in, the feces box I strapped
to a belt at my waist. But this arrangement I very soon found to be
both unsafe and very uncomfortable, and I substituted an ordinary
military valise, in which I carried the bottles inclosed in thick felt
jackets as before. The feces box being strapped in the place in which
the soldier would carry his canteen, a haversack for my bread, and a
pair of thermometers carried in separate special pockets, so as to be
accessible at once, completed my equipment.

I may remark in passing that the question of a comfortable knap-
sack is a very important one, as anything which causes discomfort
may very seriously increase the internal, if not the external work of
the body. I have tried almost every form of. knapsack, and have
found the modern military valise far superior to any other form. The
position of the Joad is such that the strain is equally distributed, and
there is no galling or sense of local weariness on taking it off after a
long day’s march, and above all it leaves the respiration perfectly

VOL. XXXIX. 24H

458 Mr. W. North. The Influence of :

free, a quality possessed by no shoulder knapsack with which I am
acquainted.

The urine and feces of the previous day were carried to the labo-
ratory every morning by myself, and were analysed after the follow-
ing methods.

Methods of Analysis of Urine and Feces.

The urine was passed directly into the wide-mouthed bottles already
described, and after the specific gravity had been taken, was poured
into a large measuring cylinder, and the amount noted. Distilled
water was then added, in order to bring the quantity to a round
number of cubic centimeters, e.g., if the original quantity was 1320 c.c.,
water would be added to make it up to 1400 c.c. After the whole
had been thoroughly mixed, the analysis was proceeded with.

This plan was adopted to avoid the risk of arithmetical errors in
the subsequent calculation of the results of the analyses.

Nitrogen.—This was estimated by combustion with soda-lime, after
the Munich method. 10 c.c. of urine were taken and evaporated
with a small quantity of well-burned Calais sand and a trace of oxalic
acid, over a water-bath at the boiling temperature, in exceedingly
thin hemispherical glass dishes. When thoroughly dry the dish and
its contents were pulverised in a mortar—all precautions being taken
to prevent loss—mixed with soda-lime, and the analysis proceeded with
in the usual way. The estimations were made by titration with
cochineal as indicator.

Instead of glass tubes I have used wrought-iron ones, carefully
tested under hydraulic pressure up to 300 lbs. on the inch.

Objection has been made to the use of iron tubes, on the ground
that when hot there is a danger of their leaking, and that the corks
burn. I have found these difficulties to be more imaginary than real,
and with a little practice and the use of ordinary care I have obtained
the most excellent results. Recently I have made a number of experi-
ments, in which the urine, instead of being evaporated with oxalic
acid as above described, was introduced directly by means of a pipette
into a tube already charged with 2 or 8 inches of soda-lime, and a
small quantity of cane-sugar at the end. This latter method ulti-
mately proved equally satisfactory with the former, but it requires
great caution and careful watching during the process of heating, to
prevent the sudden development of steam in quantity sufficient to blow
the acid out of the bulbs; but this accident can be avoided without
very great difficulty. I have found it desirable, particularly when
‘the latter method is used, to employ bulbs considerably larger than
those generally sold for the purpose, and to have a small additional
bulb blown, from which the point takes its origin. This is a great
‘safeguard against the effects of possible splashing,

Bodily Labour upon the Discharge of Nitrogen. 459

Chlorides.—None of the special methods in use for the estimation of
chlorides in urine are satisfactory. Direct titration with silver, with
potassic chromate as indicator, is practically worthless, and the time
required and the risks involved in the method of estimation in the
ash render it impracticable when time is of any consequence. I have
therefore adopted the simpler plan of diluting the urine with 5 or
6 volumes of water, and precipitating with argentic nitrate in the
presence of a minimum of nitric acid, and washing and weighing the
chloride formed. The results when the operation is carefully con-
ducted are most satisfactory.

Sulphates.—These were estimated gravimetrically in the usual way
by precipitation from the boiling urine with barium chloride and a
minimum of hydrochloric acid.

Phosphates.—The ordinary uranium process was used, and I need
only remark of it, the absolute necessity which exists for the use of
perfectly fresh ferrocyanide solution. In order to secure this I find it
best to keep a quantity of the finely powdered crystals, and dissolve
them as required on the testing tile.

I have made no attempt to estimate any of the individual nitro-
genous bodies in the urine, but have confined myself strictly to the
consideration of the total nitrogen, and the variations which it under-
goes under various circumstances, without complicating the problem
by attempting to discriminate between the various bodies which go to
make up the total which, as a matter of fact, our present methods will
not allow us to do with enough accuracy to: make the investigation
worth the immense amount of additional labour which it would
involve.

Methods Used in the Analysis of Fosces.

The collecting apparatus has been already described, and I need
only now say of it that it was thoroughly satisfactory in every
respect.

On arrival at the laboratory the cases are opened, the glass dish
and cover removed, and together with their contents carefully weighed,
the difference between the total weight and the weights marked on
the dish and cover giving the weight of the feces. The cover was
then removed, and a sufficiency of methylated spirit poured upon them
to cover them. This completely destroyed all objectionable smell,
and rendered the material safe from decomposition.

I did not estimate the nitrogen in each day’s feces, but divided an
experiment into three periods: the period before the work, the period
of the work, and the period after the work. Hach sample as passed
was placed with the alcohol in a large porcelain dish over the water-
bath, and after being well broken up with a glass paddle, was rapidly
dried, and the residue by constant stirring reduced to a dry granular

2 HS

460 Mr. W. North. The Injluence of

mass, which was occasionally removed very carefully to a mortar and
broken up, in order to hasten the process. The products were sepa-
rated into three lots, as above stated, and stored in a well stoppered
bottle till the analysis could be made. The total amount of dry
matter yielded by the feeces was determined, and the calculation of
the analyses made from this.

The nitrogen was estimated by the soda-lime process, the made
being reduced to an exceedingly fine powder, and burned in an iron
tube 3 inches longer than those used for the urine, in order to secure
the complete decomposition of any undigested albuminoids which
might be present.

Phosphates were estimated after partial incineration in a platinum
capsule by the magnesia method, and weighed as pyrophosphate.

Chlorides.—The precipitate yielded on addition of a few drops of
argentic nitrate to a watery extract of the dry material rarely
amounted to more than a perceptible cloudiness, and consequently no
figures appear in the analyses.

Sulphates.—The same is still more true of the precipitate yielded by —
the addition of barium nitrate and hydrochloric acid to the same
solution. It was often an open question whether there was any pre-
cipitate at all, so small was the quantity of soluble sulphate present.
This led me to consider in what form the sulphur might exist, and in
the light of Lepine’s experiments on the sulphur in the urine, I was
led to try the effect of powerful oxidising agents on the sulphur
compounds which might be present, and I very soon found that
nothing short of combustion in a stream of oxygen would completely
decompose them. ‘The consequence of this was that after a series of
experiments I found myself unable to devise a method by which the
combustion could be accurately carried out, and at the same time with
sufficient rapidity to enable the work to be completed in the time at
my disposal. I regret exceedingly that this should have been the case,
as the results of complete determination of the sulphur, both in the
urine and feces, would have been most interesting.

Ash.—In the process of incinerating the feces for the estimation of
the phosphates, the ash was always roughly estimated, and so regu-
larly did the phosphates vary with the amount of ash, that as soon as
this was known I was able to make a very fair estimate of the quantity
present.

When I began these researches I had the intention of determining
accurately the composition of each day’s feces, but it soon became
obvious that the results could be of but little value, and might
possibly be very misleading, from the extreme difficulty of deciding
how far those passed on a given day belong to the day before, or
contain something which should be credited to an earlier day, or even
to the very day on which they were passed. I have attempted by

Bodily Labour upon the Discharge of Nitrogen. 461

various artificial means to distinguish one day from another by eatmg
something indigestible, and attempting to use the position of this
body as a line of demarcation between one day and the next, but all
attempts have hitherto proved futile.

This difficulty presents itself with the greatest force at the begin-
ning of an experiment, because from the concentrated nature of my
diet, it is liable and as a matter of fact almost always at first induces
slight constipation.

Now that I adopt the plan of fasting from twenty-four to thirty-six
hours before commencing an experiment, this difficulty is diminished ;
nevertheless in one or two cases I have found that having taken a large
quantity of milk on the day before starvation, in order that by the colour
of the dejecta I might have some guide to their distribution and origin,
that the first feeces passed after the fast, sometimes not till the second
day of the experiment, would contain traces of this milk, although the
bowels had been freely moved in the twenty-four hours after it was
taken. I fear we must admit the impossibility of completely empty-
ing the intestines each day, and be content with results obtained as
they are throughout these experiments by the method of averages.
Even when the bowels are moved regularly every day at the same
hour, the amount of dry material is by no means constant, and even
when it happens to be the same, the amount of nitrogen contained in
each day’s quantity may be very different.

Microscopic examination showed that digestion of my experimental
diet was very complete, the undigested matter consisting almost
entirely of fragments of vegetable fibre, and a few starch granules
(generally burst). Repeated examinations of a watery extract, pre-
pared by boiling the dry material, failed to show the presence of
_either starch or sugar in any appreciable quantity. On one occasion

on which I suffered slightly from diarrhoea, the extract of the ash
contained an almost weighable amount of chlorides, and the amount
of sulphates rose to what might be called “ strong traces.”

The whole of the analyses of food and excreta were done at least
twice, and whenever a very discordant result was obtained, a third
analysis was always made ; the figures given in the tables are therefore
invariably the mean of at least two results, closely agreeing.

Methods used in the Analysis of Foods.

Nitrogen.—The soda-lime process was used in all cases, every care
being taken to ensure complete combustion, by very slow burning
and the use of extra long tubes. The great concordance of the results
is, | think, a satisfactory answer to most of the objections which can
be urged against the method. The following are examples :—

462 Mr. W. North. The Influence of

Sample of flour ........ 1°515 per cent.

A510 he

. 11 °60 fe

Dried ancat a2 Meee eee 11-66 ‘

: 13 °52

Dried iment.) sos 2 oelace 2

ried meat ae 8 :

i [7 el Sec oa ek OE / 1°70 ded

| 169 a
0-961

Potaton. at. cic ee ee ”

Pcie i 0-961 +133

Malle’ Sek eee eee 1 1 46 7953

1°48 “as

Phosphates were always estimated in the ash as magnesic pyro-
phosphate.

Sulphates were determined in the ash in the usual way. The deter-
minations have little bearmmg on the results of the experiments,
except in so far as they show that the sulphuric acid in the urine has
its origin chiefly from sulphur taken into the body in some other
form. The determination of the total sulphur in the food would have
been of little use unless the total sulphur of the excreta had been
determined also, and, as before stated, this was found to be quite
impossible.

The Work.—Perhaps of all the considerations involved in researches
of this kind, the nature of the work done presents the greatest diffi-
culties. We are obliged to choose between certain ordinary forms of
exercise and the use of machines for the purpose. Hach has its
advantages and disadvantages, and in all it is well nigh impossible
to determine with any reasonable approach to accuracy the total
amount of work done. The external work does admit of calculation
within limits, but our information with regard to the internal work
of the body is scanty and unreliable in the extreme, and in the present
state of our knowledge all that can be done is to eliminate the diffi-
culty by making the internal work, as far as possible, a constant. It
is manifestly unfair to compare walking with the lifting of heavy
weights or either with rowing or bicyling; in none of these forms of
labour are the same muscles used, and it is not only possible, but
very probable, that different individuals use their muscles differently
in each case; nay, more, that the same individual, unless he is con-
stantly practising, does not use exactly the same muscles on different
occasions. Walking exercise is, perhaps, the least objectionable of
all, and probably for this reason it has found most favour with inves-
tigators of this problem, and for this reason I have adopted it in these
experiments.

It might appear that the same distance walked over the same roads,

Bodily Labour upon the Discharge of Nitrogen. 463

in the same time, and under as far as possible similar conditions,
would represent equal amounts of work done, but a very little expe-
rience will suffice to show that such is not the case, and the results of
my own experiments will, I think, bear out this opinion. Although
accustomed from childhood to this particular form of exercise, and
though the actual distanees walked in these experiments was almost
always well within my powers, I can say with truth that, measured
by my own sensations, I have never before so fully appreciated the
effect of what is called “training.” For this reason, I have confined
myself strictly to the consideration of gross results. When the dis-
tances were short, the effect produced was exceedingly variable, and
in the final experiments of 1879 and 1882, when the labour was tole-
rably exhausting, all that we can say is, that the effect on the dis-
charge of nitrogen is beyond all doubt; but that it bears no sort of
relation to the work done in previous experiments.

In each succeeding walk the average pace per hour increased very
perceptibly, and yet I am confident that this increase of pace did not
by any means involve a proportional increase of internal work ; in
short, I gradually “ got into training.” I must confess that I see no
escape from this difficulty; it might possibly be eliminated by von-
tinuing the investigations over a very long period of time and taking
daily a very large amount of exercise, until as it were the bodily
machinery had learned to work uniformly, and then suddenly in-
creasing it very considerably. In my own case, a daily walk of 30
miles, increased to 50 every tenth day, would express my meaning ;
and even if this were kept up for two months or more, I should expect
the effect of the longer marches to become less and less marked.
The gist of the whole matter is, that we have to deal with a machine
which has a most marvellous power of accommodating itself to the
work put upon it, and this introduces a factor into the investigations
of which we are at present wholly ignorant; indeed, the problem is
thereby rendered so complicated, that the hope of finding any expla-
nation of the phenomena observed is somewhat distant. As regards
this particular form of exercise, assuming that it is done under the
most favourable conditions, the following pons must be considered

in interpreting the results :—

(1.) The Gidividaal who is the subject of experiment.

(2.) The distance walked.

(3.) The pace.

(4.) The load carried.

(5.) The external conditions, such as temperature, &c.

Each must be carefully worked out in turn, and a very large
number of experiments made before we shall be justified in arguing
from the results obtained in one case to those of another.

Nor is this all. Some men are, so to speak, much more economical

464 Mr. W. North. The Influence of

machines than others, 7.e., differences of weight and all else being
taken into consideration. One man will do a given amount of work —
upon a given diet, which to another would be simply impossible. I
have had ample opportunity for observing this ini the training of
boats’ crews in Cambridge, and I was particularly struck by the com-
plete absence of any relation’ between body-weight and the amount of
solid food consumed when’ no restrictions: were placed upon the diet
as regards quantity..

I hope in future experiments to be able to reduce’the errors intro-
duced by the work very considerably by: the use of a work machine
so contrived that the external work done can be measured fairly
accurately, and the internal work to some extent regulated. Absolute
results cannot, I think, be hoped for, but much may be done in the
way of rendering one experiment comparable with another, which at
present can hardly be said’ to be the case.

I introduce here a series of experiments: made in 1879, which,
though not made with' such accuracy of method as the: later series of
1882 and 1883, tend very materially to: confirm: the: results then.
obtained.

Experiments of 1879.

The nitrogen of the feces in these experiments was: estimated. by
mixing the whole quantity passed during each experiment, and
making one analysis in each case. The total quantity was as
follows :—

Nitrogen.
Hxperiment “Fe. ose. 3. -.« 18°093 grams..
Sy ve. ore) SO OG as.
TRC es tee bar Onin ee

»P)

PY A ue ieee

39

Diet during the Experiments of 1879.

Food-stuff. Daily quantity. Nitrogen:

grams ;
Coarse oatmeal 3" no ea eicnine 500 9° 485
Carolina tices, e.ucee es eee tes 50 0 484
Dried meat, ci gin delete eterna 60 6°168
Condensed Silk, LO oon 100 ¥°330
Fresh al Sopocia yet 300 0-990
Fresh ae ene a 30 0-000
Beef fat . dike sesh od pres Mets 100 0-000
Van iositon el Si COCOA a ae ass gens 12 0°400

Bodily Labour upon the Discharge of Nitrogen. 465

The oatmeal was made into thin cakes, the rice cooked in just so
much water as it would absorb, and eaten with the apples. The
potatoes were baked in the usual manner. The sugar and salt used
in these experiments were not weighed, but taken to taste.

The nitrogen in the oatmeal, meat, rice; milk, and cocoa was deter-
mined by the soda-lime method ; the nitrogen of the potatoes was
calculated from Payen’s tables; they were all grown on one patch of
ground on the Rothamsted farm, and were presented to me by
Mr. Lawes for the purposes of these experiments. Their composition
was probably fairly uniform.

Nothing excepting the nitrogen was estimated in the food-stuffs,
and consequently no comparison can be instituted between the
ingesta and egesta except with regard to the nitrogen.

The nitrogen of the urine was estimated by Liebig’s process; the
chlorides by direct titration with argentic nitrate,. canith potassium
chromate as indicator; the phosphates by the uranium process,. and
the sulphates. by precipitation. with barium nitrate..

Composition of Wire Experiment I, 1879. March 5 to March 13.

Specific | Chlorides | Phosphates | Sulphates | Nitrogen.

Date. Quantity. gravity.| as NaCl. | as P,O;. | as HoSQ,.| Liebig.

Cc.

March 5:. 895 1035 13°97 2°43 2°78 13°80
SAA OM 1173 1036 12°45 4°03 2°69 18°26
ee mel 1266 1031 | 11:46 2°91 2°32 17°39
Se. | 1498 | 1024 8°95 2-52 2°92 16°50
ee eee) 925 |; 1034 12°14 2°16 2°01 17°09
ee LOR: 873 1032 5°81 3°14 2°89 16°80
ete. 980 | 1030 | 12°25 3°14 2°32 16°16
3 Tagua 7 1255 1027 12°04 2°78 2°85 16°99
eg NS 1440 o | 1027 14°99 3°13 2°76 IW/ESak

Totals ...| 10240 104° 06 26° 24 23°54 150 °30

Averages .| 1137 | 1030 11°56 2°91 2°61 16°70

A466 Mr. W. North. The Influence of

Composition of Urine, Experiment II, 1879. March 19 to March 26.

tig Specific | Chlorides | Phosphates | Sulphates | Nitrogen.
Date: JRE ELS. gravity. | as NaCl. as P,O;. | as H:SO,.| Liebig.
c.c.

March 19. 760 1035 7°60 2°26 2°67 14°01
ee 20: 1155 1030 dL iicarh 2°55 2°55. 14°51

Borie tik 1485 1026 19°48 2°52 2°64 14°51
Apa 7 2290 1017 21°46 2°50 2°63 16°08
Ss eee 2390 10290 21°89 2°68 4°18 21°42
yy» ok 970 1032 12°52 1°70 3°15 17°31
a 20 1691 1032 17°72 3°00 2°79 16°04
226 | 1640 1027 20°50 2°27 2°85 16°82

Totals ...}| 11781 ie 138 °94 19°48 23°46 1390-70

Averages.| 1472 - 1027 17°36 2°43 2°93 14°83

Composition of Urine.
Experiment III, 1879. April 2 to April 9.
r z
: Chlorides | Phosphates | Sulphates | Nitrogen. | Specific
Ne. Quantity. | “a3 NaCl, as P,O;. | as H,SO4.| Liebig. | gravity.
Cie: .

April 2.. 663 5°24 2-92 2°55 13 04 1034
Rveteot te 1675 22°67 1°58 2°99 18°23 1023
PAWN S88 19°83 | 1°64 2°54 15-98 | 1022
PRETO Se 990 19°38 2°34 2°57 12°95 1030
Dp vel Ome 2064 20 *64 alk. 3°32 17°55 1020
ASAE Hare 927 14°09 3°07 2°67 15 °69 1032
Bs ee 1400 18°95 2°01 2°47 17°54 1027
Sa On iy cone 18-70 2-09 2-54 14-92 | 1029

Totals ...| 10534 139 °50 16°82 21°65 125 °24

Averages . 1316 17°43 2°10 2°70 15 74 1027

Composition of Urine.
Experiment IV, 1879. May 7 to May 14.
: Specific | Chlorides | Phosphates | Sulphates | Nitrogen.
Date. | Quantity. | jvavity.| as NaCl. | as P,O;. | as H,SO,.| Liebig.
c.c. ,

May 7... 695 1031 7°23 2°03 1°94 11 ‘28
Mes. | 3. 1500 1026 20°31 2°88 3-06 16°31
AO." 1486, 1022 19°41 2-25 2°13 12:98
0, (|) 1800 1026 19 -49 4°28 5°38 24-03
Pee 51) he S10 1033 12°15 3°04 3°29 17-66
Senn Lara 1038 1021 8°64 3°09 3°32 18°69
Say LS ae 1500 1022 16°87 2°84 2°80 16°17
jig eee 164') 1020 kc Serle 2°90 2°63 15°16

Totals ...| 10463 122°87 23°31 24°55 132 °28

Averages.| 1307 15°35 2°91 3°06 16°33

Bodily Labour upon the Discharge of Nitrogen. 467

Comparison of the Nitrogen, Phosphoric and Sulphuric Acids of the
Urine before and after the Work. Experiments of 1879.

Daily Averages.

Before work. | After work. Differences.

No. I.—Nitrogen.... 16 48 16°87 0°39

Ee Ort se cere oe Zot 2°87 0°10

lsh SOherraes 2°67 2°56 O-1l

No. I1.—Nitrogen.... 14°77 17°89 3°12
DO eensteraele 2°45 2°41 0-04

1a ISO in ieene 2°62 3°24 0°64

No. III.—Nitrogen.... 15-05 16 °42 1°37
P.O; cose eee 2°12 2°08 0°04

FIGS @ ice. a. 40 2-66 eles 0:09

No. 1V.—Nitrogen.... 13°52 18°34 4°82
DR gietiaveitteles 2°38 3°23 0°85

H,S0, 2°37 3°48 1, at

Balance of Nitrogen in Ingesta and Excreta. Experiments of 1879.
Experiment I, 1879. Work done March 9, 1879.

Urine. Feces. Total. Ingesta.

Noite —lotals a. ce cs 150 °30 18-09 168 °39 169°71
Daily... 33.16 16°70 2-01 18°71 18°85
Differenes... 3 Ap He32

No: II.—Totals ...... 130-70 16°08 146 :78 150 °85
Daily... pak 14°83 2°01 18°34 18°85
Differences .. ee Me W. 4°07

No. IlI.—Totals ...... 125 °94, 15°29 141 °23 150 °85
Daily Lease Se 15 ‘74 1 91 17°65 18°85
Differences .. are ; 9-62

No. LIV.—Totals...... 132 °28 16°87 149-15 150 °85
Wale ioe. | |) 16°58 2°10 18°64 18-85
Differences .. ay aes we 1:70

Hixperiment I, 1879.

Distance: walkedel ssi ses. c'he's 96 ss OO) LIMES

Total time of journey......... i.e. dO, Hours:
Sea Sia olore ose airs sich Havana ds a Yarden coats 1; hour.

Actual tine of walking’.......23... ¢ hours.

VELA E (ACO uy sis ole sjai-tia'e © ie ~' -++--. 4°28 miles per hour.

MGM CATed ys toe 2 dv atldio+ 4» aE Sie os 22°56 Ibs.

468 Mr. W. North. The Influence of

Experiment II, 1879. Work done March 23, 1879.

Distance walked... cd sews) closiein ka) OO eS

Total time of journey .......... ... 8+ hours.

Peel GS: 5's. oust disk Kanye ouetcneneie wie sie eee 14 hour.

Actual time of walking ........ lun 2 hours:

INGEIBVES OENOS Mn AB SS Sb oS cclS aso} 4°55 miles per hour.
iLoad carnied 7.2.5. ./. SA RbRnG da 50a" 24 Ibs. |

Remarks.—Stiff north-easterly gale blowing all day; heavy rain
and sleet, bitterly cold.

Experiment III,.1879. Work done April 6, 1879.

Distance walked (05. '\eue-- -oe'oee cue 26 miles.

Total time of journey ........ joa, , O09, HOuER

Actual time of walking ......... 12s Ozhoursy
Averave ace) daaescseee o- Sete BP 3 4:33 miles per hour.
load? carted! Sos 6: sic cece salen eo es pee los.

Remarks.—Rained heavily and without ceasing during the whole
journey.

Experiment IV, 1879. Work done May 10, 1879.

Distance: walked: oc sise6.s-aie-esur sone ... 49 miles.

Total time of journey ......... oe sepa 12 hours.

TETON ES 02 ies eeu hrs toe Wis ert oneis @ araiunce ele 13 hour.

Actual time of walking ............ 104 hours.

Average pace ...... vaiepcaaes Jae er A 466 miles per hour.
Load carried ...... Mialeyt gla emisis/ ake eyernle 30°31 lbs.

Remarks.—Had nearly one hour’s sleep in the middle of the day ;
the pace during the last two hours was considerably above the day’s
average. I returned to London by train very tired and stiff, but
slept soundly and was practically recovered the next day.

: Pulse, |Temperature,| Body- Mean dail
wa ae lying. sidath. Ee body eto
1879. :

March 5.... 8. AM. 56 98-0 129 °31
- Te ries pes Wide see 58 98 °8 13406 131 °68
9 ; 54 98-0 132 °56
Aa Bas anl| MEZBO 53 98-1 13431 133 +43
8.30 — ,, 56 98 °3 132°37
” 8

12.15 ,, 52 98-4 13418 133-27
8.30 ,, 49 98:4 |. 183-25 Os

Bodily Labour upon the Discharge of Nitrogen. 469

Pulse, | fempevature,, Body- Mean daily

Date. Time. lying. mouth. weight. | body-weight.
1879.
March 9....} 12.15 a.m. 5A 98 °6 13300 133 :12
8 mS 54. 98 °2 130 °87
if P.M. oe a 126°62
12 ‘i ae ee 130-68 129 -39
poe Oss 9.30 A.M 56 98 ‘6 129 -00
eae G oe 2 Ee 60 99°8 T33925 Se
230 47 ;, 56 98 -4 131 °12
oe en 2 ae 54 98 °6 133 °43 132 °27
Ba +), EWE 98:2 131 °93
Seals SO, 52 98 °7 134-50 133 -21
B30 655 53 98-1
go SA 2 eee 52 98:0 135-12,
930: 48 98-2 133 -00
aan 2 nt 58 99 °3 WET E87 132 °18
9 fe 53 98°1 130-12
eer UL SO, 57 99:0 TSE Loe ié 130 °-74
12.30 P.M. “as 129 37
ea a A.M. 60 99-0 129 -56 129 -46
8.30 ,, 51 98 °4. 128 °43
en BS. b-30.- : 57 98 °7 132-25 130 °34
10 ae 63 98°6 130 °75
Pe Oe. 230 -,, 63 99°8 129 -50 130 °12
11 - 54 98 °3 128 °31
sy a T2AS: "3, 58 98°9 13456 131°43
10 A 54, 98 -4 132 °75
Neg a lage 300% 52 98°7 184-87 133 °81
10 © 49 98 -4 133 18
Pus Ag 12.30. Ae 98-7 135 °50 134 °34
9 As 54 98°3 133 °68
Ge 3 See 30)". ,, 56 99-0 LSS Sy" 183 °52
8 a 53 98:0 132°18
9 P.M ate 128°18
Bh es 12.30 a.m 59 98°5 131-00 130 °45
11 3 49 98°5 128 ‘81
Zsdyeaey 3) 2:30 5: 49 99-0 134° 00 131 °40
11 vs 50 98°7 IB eS,
BO PAS 2 A 56 98°8 134°68 133 °52
10 Pe 53 98°6 133 °00
eae’ 2 % 59 100°8 135 -00 13400
10 a 49 98 °7 133 °12
» , 28.6 a
eee 43) 2 i 54 99°0 130 °43
10 at ei 98 °4 128 ‘68
gs) PSO ere. 1 .; 57 99 °5 130°75 129 °71
10 A 54 99-0 129°18
ee | Pe 1 5 51 98-0 129-12 129 15
9 hs 55 98-0 128-0
Aprils dL, «<< 2 - 49 98 °*4 129-87 128 :93
10 4 Bil 98 °4, 128 °43
Ds Date 3 us 51 99-0 129 °37 128 :90
IBM, 5, 53 97°9 128 °68
fake oN 1 sf 56 98 -4 134-18 131-43
10 As 54 98 ° 4 1382 °50
pp tae: 2 ae 53 98 °6 133 *62 133 °04
1030" —)) 59 98-4 131°81
Phi 7 ere 130, aie 99°8 182 °43 132 °12
1 +5 55 98 °6 130°43

470 Mr. W. North. The Influence of

lying. mouth. weight.

1879.

Marché .. 1 Perea 5. 58 99-0 134°50 .

9 as 5. 98-0 132 °75
10 PM 61 99°3 128 -06
nal’ i ee ce me 132 -00
11 i 49 98-0 130°18
SRS 1 % 52 98 °7 13468
10 a 54. 98° 4 133 25
09) 1 5 54 98 °8 13518
10 Ss 56 98-4 133 -12
PAO 12:30 5: 53 98-8 134-93
8 a 54 98-0 133-43
May 5 180° |. 50 97°8 130 37
i P.M. 48 99-0 132 :00
Fs) MeORIS Sale O° A.M. 51 98° 4 130-68
Be) 3 e 52 98 ‘8 130-18
S.30) 4), 49 98 2 129-31
NG anaes ie 1 a 49 98 -2 134°31
9 3 48 98-2 132-50
oO We oe 2 ‘ 53 98-8 13468
10 S 55 98-4: 132-18
alt P.M. 57 a4 134°31
BOs waists 3.30 A.M. 54: 98 °4: 133 -06
11 P.M. x5 =: 126 °25
ap Lk By aA - 99°3 129 -25
jab 33 57 98 -4 127 00
BO aid Pol bs 53 98°8 132-43
9 * 52 98 -4 130 °87
rigs: Wo pea ae 3 ‘ 51 98°6 134°31
ri : 59 98:4 132-62
»» 14 Hf Ms 59 $98°7 135°31
9 és 59 98-4 133 -43
ag a) - a ss 52 98°8 132°68
8 58 98-0 131 °31

The 1882 Series of Huperiments.

Pulse, |Temperature,| Body-

Mean daily
body-weight.

——

132 °46
130 ‘93

13243
134-21
134-02

131-18
130-43
131-20
133 °59
133 °24

129 52
129°71
132 °59
133 °96
133 °05

The following tables exhibit the whole of the results of the obser-
vations made during these experiments ; for convenience of reference

I have designated them by letters, as follows :—

Table A.—Quantity, specific gravity, and chemical composition of

the urine.

Table B.—The time of passing, quantity, and composition of the

feeces.

Table C.—The total daily discharge of nitrogen by urine and feces.

This table requires a brief explanation. In order to distribute the
feeces as evenly as possible over the experiment, which, as I have
explained before, is very difficult to do satisfactorily, I have assumed,
as I have endeavoured to show I have some right to assume, that
generally speaking each quantity of feces represents a day. On this

Bodily Labour upon the Discharge of Nitrogen. 471

assumption I have set back the feces, so that in Table C they appear
opposite the day to which they probably belong. In some cases this
has not been possible. On the whole I think this plan is better than
the alternative one of dividing them equally over the whole time, or
considering them quite separately.

Table D shows the daily state of what I may call the debit and
credit account of the body as regards nitrogen. The fluctuations
of the “store nitrogen’? can be comprehended very readily
from it.

Table EH gives the daily discharge of P.O; by urine and feces, on
the same assumption as that made in constructing Table C.

Table F shows the results of all observations on pulse, respiration,
temperature, and body-weight.

Table G gives the mean daily value of the observations recorded in
Table F.

Table H shows the amount of work done, and the loss of weight
sustained in consequence.

I had originally intended to enter upon the question of the force
value of the food and its relation to the energy expended during the
work. At the best it would only have been an estimate based on
Professor Frankland’s* tables, and the data from which the work of
the body, both internal and external, are so inexact and untrustworthy,
that under the circumstances I have thought it best to content myself
with a simple statement of the number of miles walked, and the time
occupied in the performance of the work. It will be sufficient here
to say that the general truth of the conclusions drawn from the
classical experiment of Professors Fick and Wislicenus is confirmed by
the results of these experiments in every case.

It is to be understood that except when otherwise stated, the diet
was that given in the table accompanying the section in which the
diet was discussed, and that no exercise was taken except such as was
involved by my ordinary occupation.

Hzperiment I, 1882. May 24th to June 1st.

The figures in Table A point conclusively to the fact that the work
done on May 28th caused a considerable increase in the nitrogen dis-
charged by the urine. The average daily discharge on the four days.
before the work was 14°15 grams, whilst during the remaining five
days it rose to an average of 15°74 grams, and the increase not only
affected the discharge on the day of the work, but every succeeding
day. There was apparently no tendency to return to the average dis-
charge before the work, and it would seem as if the exertion had simply
served to give tone and regularity to the nitrogen discharge.

* “The Origin of Muscular Power,” ‘“ Phil. Mag.,” No. 215, September, 1866.

472 Mr. W. North. The Influence of —

The average daily elimination by urine and feces combined is:
first four days, 16°64 grams; last five days, 17°88 grams.

Despite this increased discharge, there were remaining in the body ©
2°77 grams of nitrogen known to have been taken in as food. The
figures of Table E are interesting, as showing that up to the day of
work the body was steadily accumulating nitrogen, which was as
steadily given out in the period after the work; it is perhaps a matter
of regret that the experiment was not prolonged for a few days, in
order to observe whether the ratio of the ingesta to the excreta would
have returned to that existing before the work. It is worthy of remark
that though the exercise increased the discharge, the amount of nitro-
gen retained in the body during the period after the work was greater
than before it. ae

The average daily discharge by the feces was: first four days,
2°48 grams; last five days, 2°15 grams, clearly pointing to increased
absorption by the intestines.

The Phosphoric Acid.—Comparison of the ingesta and excreta shows
an excess in the latter of 2°60 grams. There can be, I think, but
little doubt that this was due to the diet before the experiment com-
menced, the difference in the P.O; of the ingesta and excreta for the
first four days, 7.e., the period before the work, being 2°72 grams, after
the work the daily discharge was 3°84 grams, and the daily entry
3°87 grams, or, allowing for error of experiment, practically the same,
since it would appear from the consideration of the phosphoric acid,
that the effect of the work was to regulate the daily discharge.

The agreement of the figures may be accidental, but considering
that they are the sum of a number of separate analyses, this can
hardly be the case, and this I think tends to justify the distribution
of the feces according to the plan which I have adopted. |

The sulphuric acid was undoubtedly increased after the work to the
extent of 0°24 gram per diem. The bulk of this excess was excreted
on the day of work itself, as the following figures show :—

Daily average.

H,SO, four days before work ........ .. 2°76 grams.
H,SO, fours days after work ........ is 288 2a
H, SO, day. of qrork | si isces\csis eis eed SAS Glee

that’ is, an increase on the day of work of 0-66 gram above the
average of the whole of the rest of the experiment.

Bodily Labour upon the Discharge of Nitrogen.

Composition of Urine.
Experiment I, 1882. May 24 to June l.

473

Table A.
| Speci ; |
-, | Specific | Chlorides | Phosphates | Sulphates | y.
Date. | Quantity. | sravity.| as NaCl. | as P.05. | as Hy3Oq. | ee
|
Ge:
May 24. 700 1022 2°88 2°43 2-78 14.80
» 25.| 800 1026 6°87 2-01 2°75 13-95
55 26 1000 1022 11°72 lip (ls 2°77 14°10
eee LOO 1024 12 -93 LSss 2°75 13°77
| Soeen L000 1025 9°39 1°76 3°48 15°57
Ss 860 1024 7°83 2°04 2°96 15°92
| a. 1200 1025 11°25 1°93 2°85 15°89
hea. 1100 1025 13°94 2°16 2°92 15°38
| June 1. 1210 1025 15-05 2°05 2°81 15°94
| Totals .. 8970 ar 91°86 18°00 26°07 | 135°33
| Averages 996 1024 10°20 2°00 2°89 | 15°03
ee
* Day of work.
Composition of Feces.
Experiment I, 1882. May 24 to June 1.
Table B.
Time of : Phosphates ;
| Date passing: Quantity. a ©.02 Nitrogen.
grams.
May 24..... rejected
: » 20 -< none
<\ 26 4.30 P.M. 110 2°44 2°22
MOF; eae. 2300) |: 127°5 2°72 2°57
| Pe 13 eee 12.15 A.M. 130°5 2°79 2°63
| sot oceans EZ ye. 145 2°23 2°52
0 Se ee 2.15 P.M. 119 E72 2°08
age 5 eevee 2 A 132 1:99 2°31
dune £02... 1 - 108 1°63 1°89
Z { 12°30 ,, 147 2°21 2°57
g es 11 fc 109 1°64 90
at fee BS Stee eae
Totals’. 31; 1128 19°44. 20°69
Averages... 125°3 2°16 2°29
VOL. XXXIX. AAE

474 Mr. W. North. The Influence of

Total Daily Elimination by Urine and Feces.
Experiment I, 1882. May 24 to June 1.

Table C.
Date Nitrogen of | Nitrogen of Tolale:
urine. feeces.

May 24....... 14°80 2-22 L702
Hi PD) SOA ee 13°95 2757 16°52
5 ABE vai sciahe 14°10 2°63 16G¢s
Ree 13°77 2-52 16°29
SRO sine ibs 9/ 2°08 17 °65
3. NOOR ke 15°90 2°31 18-21
SOON aa, 15°89 1°89 17°78
AS qoilie ns. cee 15°38 2°57 17°95

sune codes beh. 15°94 1°90 17°84
Motwlsaa. sce 135 °32 20°69 156° 02
Averages.... 15-03 2°29 17°33

* Day of work.

Total nitrogen ingested ...... 158°78
os a5 excreted ...... 156°02

Difference..... 2°76

Daily Balance of the Nitrogen of Ingesta and Excreta.
Experiment I, 1882. May 24 to June 1.

Table D.
ee Nitrogen of | Nitrogen of Ditoconce!
ingesta. excreta.

May 24....... 17°64 17°02 0°62
5h LD iia eat 35°28 33°54 1°74
Sy PO, vise ees 52°92 50°27 2°65
i genera 70°57 66 56 4°01
55 MOE ete 88°21 84°21 4°00
| on ea 105° 85 102-44 3°41
| BO). tel | BEBO 120-22 3°28
ola ieee 141°14 138°17 Beod

June wey eee 158 °78 156°01 Dae

(ob)

Bodily Labour upon the Discharge of Nitrogen. 4%

Total Daily Elimination of P,O,.
Experiment I, 1882. May 24 to June 1.

Table HK.
Date. Enc Eu os Total.
urine. faeces.

| May 24. 243 2-4 4°87
nD: 2°01 2°72 4°73
Pas 8G: 1°71 2-79 4°50
Ee 2: 1°89 2-23 4-12
i vex 128" 1'76 1°79 3°55
hit.) 4 29. 2-04 1-99 4-03
His. 30. 1-93 1-63 3-56
OP See 2°16 2-21 4-37
Sumer, lave .75 2-05 9) os LeGs 3°69

| See ag ae - . —SS ——
Totals......{ 17°98 19-44. 37-44.
Averages.... 2-00 2°16 4°16

|

Total P.O; ingested ........ 34°84 .... daily 3°87
a EXCPeted Mossi. waren OC AAD | calails AG

Excess of P,O; in excreta .... 2°60

* Day of work.

Observations on Pulse, Respiration, Temperature, and Body-Weight.
Experiment I, 1882. May 24 to June 2.

Table F.
Pulse. | Respiration. Temperature, FE”. |
Date Time. SMT RS T Goe te oe ee
I doe ets 1b, S. Mouth. | Axilla. |
lbs.
May 24...| 10 am. .. ae a a6 129-75
Ont. )| LO w., GOA eo OL be a 132 °25 Be 98 ‘0
ZO a6 | OPBO MIs, COR as oie 130 °50 sie 97°8
Oars) ee eM. | 'G5x| SO ec oe 133°11 an 97 °3
26114) SPHOWAG ME. UN OGn| 78 Ni. AG 132-00 Ms Ci
ro Staton 1 168el 85h 5. ts 133 75 % 97-4 |
<i BAT a apa MED NT a | 1c 4 132-25 a 97-2
Remo ere tale. Gant 84 I . iv 133-75 a 97-8
M82 | tome \SO2n G4 Ns. a 132-00 i 96 °4
eos LO SON ek led. 48 » 100:0
es 10.40 ,, 144 100°1 |
Be 8). elem. | os 3 |e: : 100°0
WO. sol Peewee). 1 Sah 114

* Day of work.
+ Taken whilst sitting in the train.
Padi ae

AT6 - Mr. W. North. The Influence of ‘

Table E—continued.

Pulse. | Respiration. Temperature, F°.
Date. Time. ae
Ly tS L. 8. Mouth. | Axilla.
lbs.
May 28)... 8:20 Pam | 2. S) ee a0 129°00 ooaF
ee Ore ae rear as ns vs) ae
Oe. Wk eM SY ny LOZ 56 ie 131 °25 36 99-0
DOK | 20 utes Mia emo tee i 129°50 | 97:6 | 97-2
ee oe ore io 132 °25 ere
SOE WG: Sa ge Wa al gee ale & 130°75 Beans 52
Sie eB) gen oO! la eea - 133 -75 a Mtoe
LBP So ye eolieT0 \aeeen alae 129-50 ee eyo
Sune: Upset) 2eOy See DO AAO alae es ce 133 :00 5A 97 °4
ea 800 Nemo eal si 131-25 fee
ep AO) 6 PRO) G4 132°50 97-4,
es 2 EON epee 131-25 97-4
|

Mean Daily Body-Weight. Pulse and Temperature.
Experiment I, 1882. May 24 to June l.

Table G.
Heres. Axillary
D Body-
ate. . temperature,
weight. °
L. N) ;
lbs.

May 24... 131-00
Sones 132:18 | 61:5 | 75-5 97-55
Ay fe Oemaeten 132 °87 62:0" 81°5 97°30
R47 133 °00 590 75-0 97 50
oi te 130°75 | 64:5 | 83-0 97-70
pO ee ircucimee 130 °87 59-0 78°5 97 -30
| 55 Ub eae an 132 °25 530 69-0 97 °20
see ets evattate oes 130°75 54°5 flere) 97 °30
J Ue ft je noi ne 131 °37 55 °0 59 °0 97°30
Averages.... 131 ‘67 58 °5 74:1 97°40

Bodily Labour upon the Discharge of Nitrogen. ATT

Experiment I, 1882. May 24 to June 1.
The Work done May 28, 1882.

Table H.

Wistance walked. 9... 4.6. oes soe os 30 miles.
Moral time of journey ......-.0+- 8 hours.
HED ret sons ps ooh Sets alk Whe, Sys ei ow ld oxo 1 hour.
Actual time of walking ............ 7 hours. .
/5: TOSCO TEES OO OC Oe IE Meee 4°28 miles per hour.
Weight naked before starting........ 132 lbs.

55 OO ARAM AMIN Shoe oe 1S)
LORS AAS Ay Ee IG es Sr, Cn ae Ons.
Weight of clothes and kit, 7.e., the load

Peis Cae PuL Ary s ihe theiaet, Wis lol's thos 28

Remarks.—This was the first long walk I had taken for three
months. JI was out of condition. The day was exceedingly hot, and
perspiration excessive.

Experiment I, 1882.

Whole experiment. Daily

Nitrogen of urine .... 135 °33 15 ‘03

» Of feces.... 20°69 2°29
Total excreta ........ 156 02 17°32
Total ingesta ........ 158 °78 17 ‘64
Witterence’ sos... . 2 2°76 0°32
OR Ob UNINC. 2:56.25 a6 18 -00 2 00
P.O; of feeces........ 19 -44, 2°16
Total excreta ........ 37°44 4°16
Total ingesta ........ 34°84 3°87

Differences ...... >... 2-60 0°29

Before work. | After work. | Difference.

Nitrogen of urine .... 14°15 15-74: 59

Ok faeces ye: 2°48 2°15 0°33
Total nitrogen ....... 16°66 17-89 1°23
POOP ob Urine... 05 i. 2°01 2°00 0:01
P.O; of feces........ 2°54 1°85 0°69
Total excreta........ 4°55 3 84 0-71

H,SO, in urine...... 2°76 3-00 0°24.

478 Mr. W. North. The Influence of

Heperiment IT, 1882. June 7th to June 15th.

The Nitrogen.—The work produced a very obvious increase on the
day on which it was done, which was continued and was even more
marked on the day following; the average daily discharge before the
work was 15°22 grams, after the work 17:95 grams, despite this
increased excretion. The reserve at the end of the experiment was
only 1°54 grams less than on the day before the work; in the previous
experiment the diminution in the reserve amounted to 1:23 grams.

The Phosphoric Acid.—There was an excess of phosphoric anhydride
excreted over that ingested over the whole experiment amounting to
0°5 gram, a quantity probably well within the errors of experiment ;
still it is worthy of remark that the difference during the first four
days amounted to 0°56 gram, which would seem to indicate the
previous diet as an explanation.

The Sulphuric Acid.i-As in the first experiment there is an
undoubted increase after the work, the excess amounting to 1-42 grams
over that which would have been excreted had the average of the first
four days been maintained.

Composition of Urine.
Kixperiment II, 1882. June 7 to June 15.

Table A.
- Chlorides |Phosphates| Sulphates .
Date. Quantity. | Sp. gr. Aol NaCl. las eLOn 1 encan Nitrogen.
O16.
June 7.. 900 | 1018 2°54 2-40 2°92 15°27
yo ae 1100 1028 10°55 1°81 2°66 13°92
5p ete 1440 1025 16-08 te \7/ 2:75 13-43
los 1070 1022 12°42 1-80 2-66 12°49
slate 1100 1026 12°13 1:98 3°65 16°15
1 LO 830 1020 7°58 1°86 3°02 16 ‘31
ako 1100 1025 12°47 1-89 2°55 14°98
3 dA 1190 1025 13°78 1°80 2°88 15 °46
5, eae 1290 1023 14°36 1°66 270) 13 59
Totals ..| 10020 101 +91 L707 25 88 131 °60

Averages| 1113 1023 11°32 1:89 2°87 14-62

Bodily Labour upon the Discharge of Nitrogen. 479

Composition of Feces.
Experiment II, 1882. June 7 to June 15.

Table B.
1 : hosphates ‘
Date. of mae Quantity. ao. Nitrogen.
grams.
June 7...... a6 rejected.
Pap eOnaie sas’ AeOLPs Mis 52 1°14 1°01
WO cece |. L24On by, 131 2°87 2°56
LO: 3 - 114 2°50 2°22
7 oi Med : none
ele ia ea s 132°5 2°77 2°57
Be eretegers is ¢ ie aye 130 2°08 2°47
ai. ieee ek" 148 2°36 2°81
tte ae ate 5 EP 107 eval 2°03
leis ce, 445 ,, 178 2 +84, 3-38
WROGANS a6 cc 4c ws 992°5 18°27 19°05
Averages.... 55 110°2 2°03 2°11

Total Daily Elimination of Nitrogen by Urine and Feces.
Experiment IJ, 1882. June 7 to June 15.

Table C.
Date Nitrogen of | Nitrogen of Totals.
urine. feces.

Ap 0tT Gy Regenerate 15°27 1°01 16°28
J MS 6 AS Be 13-92 2°56 16°48

Jeg Bees Page hae 13°43 2°22 15°65
DLO ea 12-49 0-00 12°49
ood dl Gace a Te 16°15 2°57 18°72
pliers a aisteras 16°31 2°46 18°78
PMU) tercrons % 14°98 2°81 17°79

Aa: aon eee 15 46 2°03 17°49

a US Rane 2 oe 13 59 3°38 16°97
Motalsitetyeiee + 131-60 19°08 150 °65
AVELAGES 576 0 14°62 25 V0 16°74

* Day of work.

480 Mr. W. North. § T, he Influence of

Daily Balance of the Nitrogen of Ingesta and Exereta.
Experiment II, 1882. June 7 to June 15.

Table D.
Nitrogen of Nitrogen of :
Date. ee: ae Bee pt Difference.
ANNE) (es 54 17 64 16 28 1°36
EMS PA NS 35°28 32°76 2°52
giana rere tere 52-92 48°41 A 51
hOLe wee 70°57 60-90 9°67
Sat eer 88-21 79°62 8°59
reo) a 105°85 98°40 7-45
pa niliea a oaroiens 123:°50 116°19 7-3
AA ae 141-14 133°68 7-46
CT AER 158°78 150 °65 8-13

Total Daily Elimination of P,O,.
Experiment IJ, 1882. June 7 to June 15.

Table H.

| Date. P.O; of urine. | P.O; of feces. Total.
JMC e/a cken 2°40 1:14 3°54
EI AA Se 1°81 2-87 468
ANON 1:87 2°50 4°37
set 1°80 0-00 1°80
pe iL 1°98 27h 4°75
aoe 1°86 2-08 3-94.
Sci aatn 1:89 2-36 4.°25
nae. 1:80 1-71 3°51
LAWL ND ie an 1°66 2°84 4°50
Motaleyerren ss L707 18°27 35 °34
Averages.... 1°89 2°03 3°92

Total P.O; excreted............ 85°34

HS IMSESLEM |e ete ald ain ne OOM

Difference ........ 0°50

Bodily Labour upon the Discharge of Nitrogen.

481

Observations on Pulse, Respiration, Temperature, and Body- Weight.
Experiment II, 1882. June 6 to June 16.

Table F.
Pulse. | Respiration. | Body- Temperature.
Date. Time. weight.
Lh.) 8 L. 8 Mouth. | Axilla.
Ibs. ie Fr.
June6....| 9.30 4.m. | 56] 80] .. 129 -25 56 97-0
ee PAO a NBT ATE hes 129 37 97-4
palais 10 » | 48} 58] 14 15 129-75 a 97-1
de 4:10 P.M. | .. 50 ae the ae 98-1
Soha 11.30 __,, oe ae Ihe ots 98 0
Panis ea 1.45 a.m. | 62 | 64] 15 16 134 °25 56 96°8
Oren kon ts | S68) c68 (1g Has 132-50 ni 97-6
Mee Suis. 6 P.M ike 3b 15 fs 98°8
ee Oe wie | 79.) 821.157) U5 Ae4eyon 97°7
Mee O, et)! 52) 66) 14. | 14 132-75 es 97-0
Meee 430m. Wm ods : a 99-0
MO) Slo Am. | 74 1 84.) 18 18 ae iv 98-0
x Oe 9.30 , | 50) 54] 15 15 131 °62 Ais 97-0
ay Oe 2.15 P.M si nb ae ae 98 °4:
Pea lilies e3OrA mM.) | Gl 78 | 1S 18 132 ‘50 o0 97-2
se. lh bea 8 OO 69>) 16 16 131 °25 A 97-0
“ge es) ae ae : i : 99 °2
tn 111: ©, i 15
We lie. |) 11.30", ie is ‘ 99 2
Ba oe 12.25 P.M 108
ates #490" 2 nr eee a. 99°2
ep i be 8.30 _,, ae ee oe 126-75 98 °4
oa s0rem | bs i727) 16 15 130-00 ie 96°8
elas. V0 Use oO | aul. 1G 15 128 °75 30 97 4
an 5.30 P.M. | .. ws : ce ac 98 *4
TB ee TIC ere me a ie 98°7
We Bac BN) 56 49 54] 15 16 131 °75 a 97-0
ay Lolo 10.30 ,, | 58} 52) 14 16 130 62 fe 98-0
Pikes a OMe Mien irre ie ae 99 0
See ON ate Hee ah a 99 0
eS uke mt GOK s 84) ig. call O17 133-00 | 97:3 | 97:0
Ae Ons, welkb2 6s. 1B. | 14 131-75 i 97°3
Rpt a i Pin Be li KS ee 99:1
Pe cc are iaibs i af 99-2
Los 2 amM.| 60} 70] 15 18 133 °75
is: yada aha 5G |. ds: le 4 131 ‘87 97 °6
nil On. 2.30 ,, 66 | 84] 16 17 132 °50 97 °4
16): 9.30 ,, i ie 131-00

482 Mr. W. North. The Influence of

Mean Daily Body-Weight, Pulse, and Temperature.
Experiment ITI, 1882. June 6 to June 1d.

Table G.
Pulse. Respiration.
Date. Body-weight. Axillary
temperature.
L. S. Jb. 8.
lbs. He,
June 6 130°31 56°5 | 78°0 os ee 97 -20
HAA 131 °90 55°O | 61°0 | 14°5 15°5 96 -95
ee 138°67 | 67-5 |.75:0 || 14-2 1-15 .0uemeagaee
adie) 133 -00 630 70°0 16:0 16°0 97-50
» 10 132-06 | 55°5 | 66:0 |15°0 | 165 | 97-10
sg lalic a oieks Sieee 129-25 51°5 70°5 16°0 15°5 96°90
pale 130°25. | 52-6 | 66:0 | 15°7 | 165i) agape
Fy eas 131 81 59 °O 66 °0 15°5 16°5 97 °50
TAC uses 132°75 | 56-0 | 69-0 | 14-0 | 16-0
LD 131 °79 60-0 70°0 14°5 15°5 97°50
Averages ....| 181-67 | 57-65.| 69-15 | 15-05 | 15°6| 97-27
Experiment II, 1882. June 7 to June 15.
- The Work done June 11, 1882.
Table H.
Distance swallked pict). elec) aca ae 32 miles
otal time Ok gyOUMe yeas clea. te 84 hours
fei Wo ea Sah peer Ne MUON ge a TYAN ust Td rs
Actual time of walking............ CGgaeee
Average pace ..... a tiaras Stier stoune 4°57 miles per hour.
Weight (naked) before starting .... 131°25 lbs.
es on returning \j.,.\. 5: 126°75_,,
PiOSS 6 5S pace RPE 2 ee te ees eas 4°50 ,,
Weight of clothes and kit, z.e., load
CALICO 3G CNG! Aaa A ee eee PATE W CS).

Remarks.—The walk was accomplished very easily in the time, and
without material fatigue. I was perfectly recovered on the following

day.

Bodily Labour upon the Discharye of Nitrogen. 483

Experiment II, 1882.

Wirale Daily
experiment.
Nitropen of urme 2 .4-= |. plat :60 14°62
i FAECES ices cpotgnvs 19 05 lal
Mopalvexerebaneciis os. dees 150 65 16°74
Ma Moestaroaetia.taeleelc LoS. 7S 17°64
IP) WeTCMCE ers 2 yess) a or ertls 8:13 0:90
dL KOla Gil WHA in MeuSe nee oes e yf Oy 1°89
IBS ORIOE teeCeshs ©. yoavwlenls. 18°27 2°03
Motalkexeretialceco. slalele steve ae 30 °34 ayy
hag) IUCESUAL Rl. ca eae chai e & 34°84 3°87
Ditferenées. s. yen. es es 0-50 0°05
Befecre After Ditfereniée.
work. work.

Nitrogen of urine.| 13°77 15 29 1°72

feeces. 1:19 2°65 1°46

Total excreta....| 15°22 E795 2°73

P.O; of urine.... Lei, 1°83 0:14

P.O; of feeces.... 1-62 2-35 0°73

Total excreta.... 3°59 4°19 0-60

H,SO, in urine .. 2°74 27 0°23

Heperiment LIT. July 5th to July 17th.

This was in reality two experiments in one, and must be considered
in two separate periods, viz., from July 6th to July 12th inclusive, and
from July 6th to July 17th inclusive.

lst Period.

The Nitrogen.—Again an unmistakable increase in the nitrogen
discharge is to be noticed. The daily average after the work exceeds
the average before the work by 1°26 grams; the reserve of nitrogen
was reduced from 11°62 grams to 10°41 grams, a loss of 1:21 grams,
which was more than made up the next day. The close correspon-
dence with the diminution occurring in Experiments I and II is
worthy of note.

The Phosphoric Anhydride.—The increased discharge after the work
is very marked, but the total quantity ingested in the time is by no
-ineans accounted for, as the following figures show :—

484 Mr. W. North. The Influence of

P.O; ingested July 6 to July 8 ........ 11°61 grams.
P.O, excreted July 6 to July 8 ........ | O20 aa
Ditterence wise Sh oe 3°30) ae
P,0, mgested July Oto duly 1252.32... 1548,
P,O, excreted July 9 to July 12...-.... 1408308
Dutterence ¥. chia race 1:40

i.e. the work consumed 1°96 grams of the balance accumulated in the
three days which preceded it.
The Sulphuric Actd.—A daily increase of 0°25 gram followed the
work. Reference to the tables shows that the daily increase was—
in Hixpermment Ey ies acc 0°24 gram. ?
iin Hixperimentilh 3.02. i028 |
In Part I, Experiment III .. 0°25

figures hardly to be explained as the result of accident.

39

2nd Period.

The period “before the work” is in this case only one of com-
parative rest, because it includes the work done on July 9th.

The Nitrogen.—Despite the fact that July 9th was a day of exercise,
and that a considerable increase in the nitrogen discharge then
occurred, the daily difference between the nitrogen discharge before
the work of July 13th and that of the period after it is no less than
5°68 grams, or a total excess on the average before the work of
22°72 grams, and this great increase notwithstanding comparison of
the ingesta and excreta from July 6th to July 16th, both inclusive,
shows a balance in favour of the ingesta of 6°30 grams. The figures
of Table E indicate, however, that the drain on the store was hardly
over when the fast of July 17th began. I regret exceedingly that I
did not continue the observations for three or four days before fast-
ing, as it would have afforded an excellent opportunity for observing
the retention of nitrogen in the body, which seems to be the natural
consequence of a previous excessive discharge. Even if we take the
day of fast into our calculations, it leaves only 3:93 grams of nitrogen
to be accounted for, which may, I think, be fairly disposed of as a
portion of a previously existing reserve.

The Phosphoric Acid.—Over the whole period, July 6th to July 16th
inclusive, there is a balance of 1:24 grams not accounted for in the
excreta, and even if we include the day of fast, the ingesta and excreta
practically exactly balance one another. There is, however, no doubt
_whatever in this experiment, that the severe labour produced a very
marked increase in the phosphoric anhydride excreted, not only on
the day of work but for two or three days after.

The sulphuric acid, like the phosphoric acid, was nearly doubled on
the day of work, and very markedly increased for the three succeeding
days.

Bodily Labour upon the Discharye of Nitrogen. 485

Experiment III, 1882.

Composition of Urine.

July 5 to July 17.

Table A.
. Chlorides |Phosphates) Sulphates | ..
Date. Quantity. | Sp. gr. NseNaCie ae POF has HSO), Nitrogen.
ne:
iJuly 5.... 500 1013 1°14 IDaese 1°52 9°10
FntGe< « 600 1018 1°38 2-44 2-94 14:22
Acs ean 810 1019 9-05 lineal 2°36 12°36
kOe « 1240 1023 16°74 1°30 2°44: 12°18
igor elias 1510 1015 12°78 1°08 3°28 12°47
ions. | 1010 1025 10-43 1°44 3°30 16°35
hel Dara 990 1021 10°66 1°80 2°47 13°29
eee Os os, 940 1022 12°23 1°74: 2°28 dE rigA
| gold. i. 1380 1028 14-05 2°90 4°37 20°22
ee 900 1022 5-96 2-22 3°42 19-16
ae is... |". 1500 1020 13-08 2-10 2:97 17-85
Hdl Umea 980 1022 10°51 2°14 2°85 15-86
Nora's 2220 1008 8°78 1:15 0°93 9°46
\Lotals ....| 14080 £3 125169 7 | 21,299 33°63 | 175-02
| Averages.. 1173 1020 10°47 1°83 2°50 14°58
Composition of Feeces.
Hxperiment III, 1882. July 5 to July 17.
Table B.
Time : Phosphates :
Date of passing. Quantity. es p, OL, Nitrogen.
grams.
July 5.... ° rejected. Fast.
a 6 eee ae none.
ih Theat i Cam eas 225916 129 O07 1°60
Bey Seat He APNE: 176 1°46 2°19
2s Sha eg ern ae 40 0:33 0°50
OM TBO: 205 3°34 3°43
Phi 2292.) pia, 150 2 -Ad, 2-50
al 5 12230500 88 1°40 1°63
ees: BOW 4 0:87 1:01
Uae Ley, er ars Ap none 0-00 0-00
pee lise 32 F none. 0:00 0°00
iy Le, eee 214 4°39 4°28
ae Spiviar 176 2°81 3-05
se en ; none. 0-00 0-00 Fast.
Panis. Oeil 3 150 2-40 2°61
| Totals - 1382 °5 20°51 22°80
| Averages 106 °3 1°57 1°75 13 days.
| 125°6 1°86 2°07 11 days.

486 Mr. W. North. The Influence of

Total Daily Elimination of Nitrogen by Urine and Feces.
Experiment IIT, 1882. July 5 to July 17.

Date. Nitrogen of

urine.

alpuoliya OY esse ale 9-10
Tas sais be 14-22
ih ae “12-36
Sh ae 12°18
i ECan aoe 12°44
Rete ese 16°35
SA eae: 13-29
SS SET iba aa es 11°77
“ey aarer aes 20° 22
(emer ie 19-16
Scie aac 17°85
Sc Soca 15°86
1g ea 9-46

Table C.

Nitrogen of

feeces.

ONY BOP HNWONHO

‘00
“60
oS)
“09
43
“50
63
‘O1
“00
28
“0d
“61
‘00

Totals.

um

Daily Balance of Nitrogen of Ingesta and Excreta.
Experiment ITI, 1882. July 5 to July 17.

Nitrogen of

Date .
ingesta.
UTD Saale ere 0°00
“2 OP aes ans 17°64
Paes) Yes olseets 35 °28
SMES iieate aleve 52°92
PRLS Niste oi ore 70°57
55 UA 88 ‘21
7 ae 105 °85
29) eee 123 °50
> LA ae 141 °14
eee 158°78
LO Bit lass 176 °42
vail once 194. °06
part Z 194-06

Table D.

Nitrogen of

excreta.

Difference.

Fast.

Bodily Labour upon the Discharge of Nitrogen. 487

Total Daily Elimination of P,O;.
Experiment III, 1882. July 5 to July 17.

Table H.
Date. P.O; of urine. | P.O; of feces. Total.
JIL es oreo MU
i 2-40 1-07 3°47
Se ay ee 7a 1°46 3°17
Ee Bk: 1°30 0°33 1°63
On ae 1-08 3°34 4-42
Sk Oeaee anaes 1°44 2°44, 3°88
Beatie 5.3 1:80 1:40 3°20
RUDD Fe. siele' a 1°74 0°87 2°61 |
is 1S aa ead 2-90 0°00 | 2-90 |
oo) 2 aaa 2°22 0-090 2°22
Railiatoeie ss 3 2°10 4°39 6°49
ReeOnh sieges sat 2°14 2°81 4°95
Fd eae Oe 1°15 2°40 3°55
Mowalsi...\... 21-99 20-51 42°50
Averages..... 1°99 1°86 3°86

Observations of Pulse, Respiration, Temperature, and Body-Weigbt.
Experiment III, 1882. July 4 to July 18.

Table F.
Pulse. | Respiration. Temperature.
Date. Time. ae
dea as ibe 8. Mouth. | Arxilla.
Ibs. iD, BS.
July 4 10.30 a.m. | 53} 74] 138 15 128-31 ss 96 °6
as Deer s50a\t Gtiteds oe 16 129 -00 27-0
ats GAs ft 1501) -70 |" 15, |r 14 128-00 i 97-0
5 (2) Grae | otele 720) T4e 16 127 50 , 97 °6
ao ON Ar, | SEM O45), 14 16 126-25 = 97 2
Pe weal LAO” 5, 68 | 74) 16 17 130 °75 ve 97°8
re S48 Waal Bal! a4 li 129-50 . 97 °2
aa 12 Paw. OO “70% 15 16 132 °25 am 97°0
8 G fuaes | SONIA 50" 18 ) cas 130 °75 e 96 °8
9 230. 6) hom 74a) 16..| 18 131-50 # 97-2
AKG Bee nobeld 58a. 16) 1& 16 130°75 oe 97-2
ae) oP IM) [ss 5 fe oe oe 99°6
Sie i a leer. 72h 16 |.) 20 ps x 97°8
POLO Mero shi, (UPAR. OS sf Oa 3|\ hi 13 127 25 oe 97°8
fn ee eee e oon IOs 14: 19 130 -25 nt 97°8
Pee a Oa Om 55 49 | 64} 15 16 128°75 oe 97°8
Bde eter lol 55 55 | 62] 14 15 132 °75 ad 97 2
al leer ea ces) Vie OL {150° ( “1s 16 130-00 ae 96 °6
Plas | oO PM. || G2." 80: 1" “TS 15 131 °25 a 97 °4
aden al| AteOew Mi, 4) O2"| GOP. (13 16 130 °75 ee 96:0

488 Mr. W. North. The Influence of

Table E—continued.

Pulse. | Respiration. Temperature.
Date. Time Body
weight.
1G. Wr tS L. S. Mouth. | Axilla.
lbs.
July 18 8.15 A.M ote 99 °4:
BASE TOM RC eA enchant A i. 98 6
Pe 1 Se al 7 BOLE IME h SOM Seno: i 124-00 | 99-2
BA TS 14 hdas eAenOD level gy eos 126°50 | .. 98-2
ei Ae OBO ACM ON NGG: lyk. 11 124.°75 BN 96 °8
ines yc, a G2 dee) badienmaailiG 129-50 f 95-9
el AA oe eNO zal edie aio 128 -00 A 96°8
AGU k Sy eye all OMe nodule agate 129 -00 A 97-1
pp otlOsge wile i 54 | 68] 12 13 127 50 ate 96°8
Tze PORO Wee wal lao TG diliad ae Mba 1 130-00 a 97-4
po 7 aT ade a eROR eso cl sila’ land 129-00. auen 96°8
oy CR aie besiON 5 56 | 100} 13 13 126° 500 4) gee O72
PALS S30 iis 48 | .. ae 69 124,50 98:0

Mean Daily Body-Weight, Pulse, and Temperature.
Experiment ITI, 1882. July 4 to July 17.

Table G.
Pulse. Respiration.
Date. Body-weight. Axillary
temperature.
i: S It S.
lbs. igs
italy Aa a ole 128 °62 51°5 | 69°0 | 14°0 | 16°5 96 °6
Bornes ie 3 127-75 50°5 | 71-0) 14:5 | 16-0 97°3
ne 128-50 59°5 | 69:0 | 15-0] 16:5 97°5
Bi ey oad ee 130°87 57-0 | 64:0 | 14°5 | 15-0 97°1
i 8 131°12 53 °D 62°0 | 14°5 16°5 sO)
ee 126 ‘75 dg (05) 68°07) 1G Os | talsn0 97°5
my AO) . 128°75 560 (ed A 3 20 Ra O 97 °8
sted El epee cer 130 °75 52-0 630 14°5 15°5 97°5
Peps Je 'ehevelesis 130 °62 56 °5 65°0 14:0 15°5 97:0
PUD ls sie ake 127°07 58 ‘0 76°0 15°0 17°0 97-1
£5014 eae aa 127-12 50 °5 67 ON) IL 07 138% 5 96 °3
oe a 128 °50 53 °O 67 Oni 12-5 13 °0 96 °9
en erro fo) 128 65 53 ‘0 66-07 12 < 13°5 aia
a 127-75 54:0 | 76-0] 13°0| 13:5 97-0
Averages..... 128 °77 54°9 | 68:4] °138°9 | 15°4 97-12

Bodily Labour upon the Discharge of Nitrogen. 489

Hxperiment IIT, 1882. July 6th to July 16th.

Two work days were introduced into the experiment, with the
view of testing the effect of muscular labour upon the elimination of
nitrogen at a time when it might be supposed that the reserve of
nitrogen had been considerably drawn upon by previous exercise, and
before there was time to accumulate a fresh store.

Work done, July 9.

Table H.
Distance walked oo .08. 50680 pov. ©. 33 miles.
Hopaltimevor journey 2061... ss. 6 9 hours.
12 RS) gue ee dS es nS ee Dect a
Actual time of walking ............ aaa
A CSREICLOU ON C2)N Rn Acetic Sr ae 4°71 miles per hour.
Mpa CArMTeGy Wielot ok cae oe wale miere ees 27 lbs.

I was prevented from observing my body-weight at the end of the
journey, as I did not return to town the same evening, and a
weighing machine was not accessible.

The loss of weight may, I think, be reckoned at about 4 lbs.,
considering the difference between the weight before starting and
the weight taken the next day.

Work done, July 13, 1882.

Table H.
Distance walkediye fos. Ws e's A7 miles.
MotaltimerOf JOULMCY< beaje oe 6 o's 113 hours.
BIealicue eget canis Aan etc ke olasns tae le cs 1+ hour.
metwal time of ;walkinge ....... 0... 10 hours.
Srlerage pace teckel velo ok 4-7 miles per hour.

Weight (naked) before starting .... 130°75 lbs.

i On Tetum) c... 124-00 _,,
, Wossewine fina, Oncones
Moddncarmed i's, cole we oi ole. Wwe seve 8 Dede) os

This journey was one of the greatest efforts I have ever made
in the course of these experiments. The first 16 miles was covered
in 3 hours 10 minutes, during the greater part of which time it rained
heavily, and the roads were consequently in very bad condition. I
was excessively tired on my return, but by no means exhausted. Food
and rest soon dissipated the effects of the walk, and the next morning
I was none the worse for the exertion, with the exception that I
was a little stiff, and suffered all day from intense thirst. I may
here remark that on every occasion on which | have sustained con-

VOL. XXXIX. Sy

490

siderable loss of weight in consequence of severe exercise, I have
observed this extreme thirst on the day following. It would seem
that a compensation for the weight lost, in the shape of water, was

Mr. W. North. The Influence of

absolutely necessary.

Comparison of Nitrogen and Phosphoric Acid in the Ingesta

Nitrogen of urine ..

ec

- FeCeS .. ».
Motal excreta (25.6. 2.
by) AD BiESbA) Sm <n bia ove

and Excreta.
Experiment III, 1882.

33

Difherence™.... ste seis
PSO or ariite. 222 one
PO: of cfeecesnct% oes
Total excreta....
ingesta.......
Difference .. 2.23).

Comparison of Nitrogen, Phosphoric and Sulphuric Acids Excreted

|

before and after the Work.
Experiment ITI, 1882.

Nitrogen of urine

Total nitrogen

Potala, Ora etter

Total nitrogen ..

Total P.O;

12 Days. Daily. 11 Days. . Daily.
175 02 14°58 165 °56 15 05
22 -80 90 22°80 2°07
197 -82 16-48 188 36 17°12
194-06 16°17 194-06 17 64
3°76 0°31 6°30 0°52
21°99 1°83 20 *84 1°89
20°51 170 20°51 1°86
42-50 3°54 41°35 3°75
42-59 3°55 42-59 3°87
0-09 0-00 1°24 0°12

Ist Period.
Before work.| After work. | Differences.
Ee Biches 12 -92 13°47 0°55
a feces ...... 1°43 2°14 Ora
‘ 14°35 15°61 1°26
P5O; Of WTI sy. ale elorenere 1°80 1°51 0°39
PO; of fecesies ae. sees 0°95 2°01 1:06
Re: 2-76 3°52 0-77
HESO, of nrtme 7.7.,.... 2. 2°58 2°83 0°25
2nd Period.
Nitrogen of urine ...... 13-23 18°27 5 04
i feces ..... 1°83 2°43 0°60
Ly, BI 3 15:07 20°75 5 68
PSO) ef apie icles eee 1°63 2°35 0°72
BOE OL LLCES . vm Rieieis oie 1°56 2°40 0 84
6s 5b be Cie ee 3°19 4°75 1°56
2°72 3°49 0°68

BESO, of urine is..d0sh

Bodily Labour upon the Discharge of Nitrogen. 491

Hzeperiment, February 5th to March 3rd, 1883.

This experiment was conducted entirely for the purpose of deter-
mining the amount of the nitrogenous reserve, of the existence of
which, in one sense or another, I now feel thoroughly assured.

The plan adopted was, after having lived on the experimental diet
for some time, to abstain from food once or twice, in order to see
whether the amount of nitrogen discharged during a twenty-four
hours’ fast was much influenced by the amount of food which had
been taken for some days previously. I think I may say in start-
ing, that the result was a negative one, that is to say, that the
amount discharged in a twenty-four hours’ fast seems to be prac-
tically a constant under ordinary circumstances.

It further seemed to me probable, or at all events possible, that as
now nearly six years have elapsed since the original observations
were made which determined my experimental diet, 1 might be
habitually taking more or less food per diem than I did six years ago.

In order to test this, from February 6th to February 13th inclu-
sive I collected my excreta, whilst living upon such a diet as I have
been accustomed to during that period, without any regard to experi-
mental considerations. I ate, drank, slept, and worked as though no
experiment were in progress, and in order to avoid any possible
influence which such observations might have had upon my mode of
life, I abstained from noticing the variations of body-weight, tempera-
ture, nitrogen discharge, &c., as 1 have found that when I am obliged
to make such observations myself, I cannot avoid the effect of con-
sideration of them upon my daily life. For instance, I feel quite
certain that had I known that on any particular day the nitrogen
discharge was higher or lower than I might have expected, the know-
ledge of it would unquestionably have affected the amount of food I
should have taken on the following day. This may seem a somewhat
extraordinary admission to make, but nevertheless I am convinced of
its truth. During the whole of this first period, therefore, I was
careful not to inform myself of the results of the analyses. On
February 14th and 15th I abstained from all food whatsoever. On
February 16th I began the ordinary experimental diet, and continued
it until February 26th. On February 27th I again abstained from all
food, returning on the 28th to my diet, which was continued until
March 3rd. This experiment then naturally divides itself into two
parts, the period of ordinary diet and the period of experimental
diet, and we have to consider the effect of the fasting in each case.

Inspection of the figures, particularly those which show the daily
discharge of nitrogen by the urine, suffices to demonstrate the great
similarity which exists between my ordinary food and my experi-
mental diet.

2K 2

492

I may incidentally remark that during these six years the variations
of my body-weight have been very insignificant, which is, I think,
an additional proof that, at all events as far as food is concerned, I have
lived, without knowing it, almost according to rule, though it will
appear in the sequel that my ordinary diet was in some respects rather
more generous than the experimental one.

With this introduction we may proceed to discuss the analytical

Mr. W. North. The Influence of

details of the experiment.

Quan-

Date. tity.
Feb. 5 190
Ar Gh aatu0,
eT la AO
a4 tolibe 7Agy40)
ee 200
LO 2000
al le 200)
wpe Ae OO)
18.2200
» 14a|}]) 800
», 145) f 800
», 15a) ) 500
kon fe 900
ee Ose 200
» 17 | 2000
yy Sh 2500
Ori 1300
3, 20) 1500
Mee ALLENS 3 7/610)
, 22 | 2100
ay LO PLeOO
» 24 | 1800
» 25 | 1400
» 26] 1600
», 24 | 2000
» 28 | 1200
Mar. 1| 2700
Py MOOG
a3 5h A SOO

Composition of Urine.
Experiments, February 5 to March 3, 1883.

Chlo-
rides.

Table A.
Phos- Sul-
phates. | phates.
PASANG 3°33
2°14 3°22
232 3°71
2°60 4°77
2°18 3°93
2°56 3°59
1°62 2°36
2°30 4°28
2°31 4°12
0°78 1°15
0°87 0°65
0:80 0:84
1°02 0:64
Dei 2°92
1°86 2°69
1°63 2°95
1:57 2-84
1:70 2°86
1°64 2°44
1°99 2°93
1°54 2°78
1:80 2°90
1°40 2°36
1°76 2°99
1°16 1:12
1°92 2°76
1°62 eal
eae 2°48
1°80 2°81

Nitrogen

by

combus-

tion.

14°
13°
13
1S)
15
15°

9:
14:
15°

50
OL

‘87

06

05

15
63
27
79

°98
“32
“49
°76
“72
"99

13

Nitrogen
by

hypobro-

mite.

13°
12°
125
16°
"29
14:

8:
13°
14°
67
“50
fly
°39
70
roll
"64

08
13
86
1g)

iL
81
21
43

Sp. gr.

1014
1020
1017
1014
1015
1012
1013
1017
1013
1010
1008
1017
1006
1017
1014
1015
1024
1023
1017
1017
1027
1021
1017
1021
1009
1020
1008
1019
1017

Bodily Labour upon the Discharge of Nitrogen. 493

Composition of Feces.

Experiments, February 7 to March 5, 1883.

Table B.
Date. Quantity. | Nitrogen. P,O;.
grams

Hebruary 7....... 240°0 53 etch 3)
s Sven sinks 171-0 2°73 2°30
“ ee oc sitar le 830 1°32 TAIL!
i LOR ee axanes ‘100-0 iL 5Y) 1°34
ese ihe 130-0 2°07 1°75
a | See 104°0 1°66 1°40
Ha ad Sin RUE ENG 110-0 1°75 1°48
pate 90-0 1:43 1:21
Be Lol sone at(a.e none © 0:00 0-00
Wit pL GRNe Seca tee 81-0 1:29 1°09
3 reel ete ig ene 110-0 “1:93 IES
yi Stas G5 1°39 0:99
(eae TOMS 141-0 2°48 AG
SNA! here ava 77:0 1°35 0:96
Bat One ce ei 153-0 2-69 1°91
Bere Ae Stat 136°0 2°39 1°69
fa 50-0 0:88 0 +62
Bh eae 123 °5 27. 1°54
aa 93-0 1°63 1°16
eh oe t 107-0 1°88 1:33
Aili As pie 164°5 2-89 2-05
Ratt eZee 6 sie Use none 0-00 0-00
Mifare nes Sais rate. ¥s6 none 0-00 0-00
fe Dies Fale : 134 °5 2°36 1°6
i? 3 73°0 1°28 0-91
i Agee ae 144.°5 2-54 1 +80
Fs Ee Me oor 98-0 1°72 1°22

2893 °5 47°15 35°89

A94 Mr. W. North. The Influence of

Daily Discharge of Nitrogen by Urine and Feces.

Table C.
Nitrogen Nitrogen
Date. of of Totals.
urine. feeces.

Bebniaiy On 02.4.6, smal iapisues 14°50 3°83 18°33
x Ga eee, 13°01 2°73 15°74,
Ba 7 13°87 1-32 15°19
i 8 18°06 1°59 19°65
ago 15-05 2-07 17°12
ia ay 8) 15°15 1°66 . 16°81
alien: 9°63 15 11°38
eT 14:27 1:43 15°70
ies th ree Sea, ee 15°79 0:00 15°79
i A 9°30 1:29 10°59
£2 AL 9°26 s 9°26

147 °89 17°67 165-56
esata | Ho eae 14°72 1:93 16°65
se amide 13°99 1°39 15°38
opt 8 13°58 2°48 16°06
RC) 12-21 1°35 13-56
120 é 13°90 2°69 16°59
oy e7Alk 12°72 2°39 1 et
aa, a2 Nericdeh 0°88 14°21
Bin ioe ok Meee! tal anes Nh 13°43 2 if 15°60
pee 15°38 1°63 17°01
a5) 11°07 1°88 12°95
eG 15°05 2°89 17°94
Pea 747i 8°66 0-00 8°66
hh Oat ies e ture Ri Rene eres cies 12°82 2°36 15°18

March BL te reerarier Aen aati ae ve 11°08 1°28 12°36

c Dee ete ee at ate rai, so 11°58 2°54 14°12
i? rdsiava Oats oie stoners 14°12 72 15°84

207 64, 29°58 237 °22

Bodily Labour upon the Discharge of Nitrogen. 495

Daily Balance of Ingesta and Excreta.

Experiments, February 5 to March 3, 1883.

Table D.
Nitrogen | Nitrogen Nitrogen | Nitrogen |-,,.

a, excreta. | of es PE OReNCe |e excreta. | of ee Patorene,
Feb. 5 18°33 17°64* | — 0°69

RG: u34- 07 35°28 | + 1:21

eon |i) A926 52°92 | + 3°66

ome) 68°91 70°57: | + 1°66

952 86:03 88-21 | + 2-18

PP eaOr | 102-84. 105°85 | + 3°01

amen BE 114° 22 105 °85 — 8°37

a iiaeg) 2 129° 92 123 °50 — 6°42

hid eee 145°71 141°14 — 4°57

yy ic ee 156°30 141°14 —15°16

poe Ld 165°56 141°14 — 24°42

pies (3) 182°21 158°19 — 24°02 16°65 17-05 + 0°40

eee Wg 97 oo 172°43 — 25°16 32°03 31°29 — 0°74

» 88+. 213°65 190°07 — 23°58 48 -O9 48 “94 + 0°85

eal s2a0 2 2b 207 :71 | —19°50 61°65 66°73 + 5°08

» 20] 243°80 225 49 —18°31 78 °24 84°37 + 6°13

wn Oak 258° 90 243°13 —15°77 93°35 102 ‘01 + 8°66

ho 2 273°11 260°77 —12°34 107 °56 119 °65 +12°09

ae 288 °72 278 °41 —10°31 123-16 137 -30 +14°14

» 24] 305-78 | 296-05 | — 9-68 | 140-717 | 154-94 | +14°77

pA a/3) 318°68 313° 69 — 4°99 153°12 172 °58 + 19°46

spiiRene 330° 62 331°33 — 5°29 171 °06 190° 23 +19°17

» 27 | 345°28 331°33 —13°95 179-72 190 °23 +10°51

» 28] 360°46 348°97 | —11°49 194-90 207 °87 +12°97
Mar. 1 372 °82 366° 61 — 6°21 207 °26 225 51 + 18°25

oy |) 386°94 | 379-64 | — 7:30 | 221-38 | 238-54 | 417-16

ay ante) 40278 397°28 | — 5°50 237 °22 256 19 +18°97

* Tn the construction of this table it has been assumed that the diet February
5th to February 15th was the same as the regulated experimental diet.

496 Mr. W. North. The Injfluence of

Balance of P,O,.
Experiments, February 5 to March 3, 1883.

Table E.
P.O; P.O;
Date. of of Totals.
urine. feeces.
Hebrilarys) Daa. one 2°47 3°23 5°70
ba Gi eene 2°14 2°30 4-44,
a Te eee DA ORO ica la 3°43
33 Sia ante é 2 “60 1°34 3 O94
Ba OFX Seige ee 2:18 Pea 3°93
ss TY ORM ae 2°56 1°40 3°96
e i i AE eerie es 1 62 1°48 3°10
La ayer Ome rer 2 35 1°21 3-56
ie Adieu aceeeeens 12 -3L 0:00 2-31
if AS eat aie 1°65 1:09 2°74,
a Dae Bae abe 1°82 — 1°82
Totals: arose ute es 24°02 14°91 38°93
Rebruarny NG one ae 2°37 1°37 3°74:
is We? rite ae 1°86 0°99 2°85
is 18. 1°63 176 3°39
‘ 19. eso O 96 2°53
* 20 A 1:70 1°91 3°61
i oe Laat Bees 8 1-64 1°69 US:
Mclean Ne 1:99 0 °n2 2°61
Ae 23 1°54 1°54 3°08
at 24, 1°80 1:16 2-96
a 25 1°40 1638333 2°73
. 26 1°76 2°05 3°81
ni 7 fa RA 1:16 0:00 1:16
ie Dork Gamat ond 1°92 1°67 3958)
March i bee 1°62 0:91 2-53
Mi Die Leve 0-80 Sie
9 3 1:80 1°22 3 02

Gtalsie ane eae dot 27 -49 20-88 48 :37

Bodily Labour upon the Discharge of. Nitrogen. 497

Observations of Pulse, Temperature, Respiration, and Body-Weight.
Experiments, February 12 to March 3, 1883.

Table F.
Pulse. | Respiration. # Tempe-
Dute. Time. CONE rature.
weight. eens
iB, bose L. S. :
lbs. F.°
February 12 ..... ORM | yAOE | BOL by 312 14 Ao 97 °0
eis sh ors 504 60.1) 1B |’ 14 ie 97-2
Pee ee ati 58 | 64.17,13. | 5 . 97-2
35 eM atras oh 9 a 56 | 69 12 14 134 °00 97 °2
Seeauls 3. 6. 1-30 ,, | 46/62] 13°] 15 | 481-75 | 95-8*
rs ee. 9 p52) P64 \e i> al. a, aed 62 (3 Gere
Ui aa 1 Pee? 6s | is we |) 138112 -|O7-0%
Per se 9 pet Onl 54 is |e 30-00) 4)" O¢r2
ry. Beso ve 52) Seep dgucl se Taga5.. | Og)s
a apes 10 Per Was Medal 12 ia cl P8980) 6 Oi
ne Uiciers 11 3 48 | 48 13 14, 132-75 97°3
pate 19.8. 4 (50) | (S0u| daly 14a bo a3-75) ole oyed
pees ee 11 ROSS Ne As Uh NGs | ens 132°50 | 97:2
oie 3 CAs Astle 1s) | tae isas0. ges
Whe 3 9 eee AS) 52 0 1s eae) 184-00) waa
A Di Leese A ye ide hee 13. 15 135-00 96 °5
: ge 10 feed, en ioe an epee ee 134°50 | 97°3
| Ges eae 3 | SS INGAS |. Iden |- 25) 5) 186-000 | Ore
i i 9 ene bry A A| hoor pr It, ©: 134°75 | 97-4
= i FOO) ep ns ae a all a ae 134:00 | 96:5
Pte 10 Fekete al ieceanl ap yas aan 132-75 | 98-0
a AC eee A, C §2 | 89 15, 18 133 °25
es $5 8°45 ,, DOr lb vrs 14 se 134-00 97°6
an Zine ots 2°30 P.M. BLS 13 we 132 50 O77.
Mer 9G
Hp 7 ea 3 A.M. Gowlene 12 we 136 °50 97°0
” Ss: eves en OB ade BAe area 12 te 134:° 25 97°6
PB i ose 2 1452 1102'| 12 1! 23 1 180-25) sOscor
ye Baer io O30). Et Tea hee 12 ee 180 °25 98-0
March 1 re aes
i ens gl O23 {0 fae a Ole he 1, ep 130 °25 97°2
x Bae. 6 Ea pala a bal 132°75 | 96-9

* February 15.—Temperature taken five times very carefully.
+ February 16.—Pulse very irregular.
{ February 28.—-After running 300 yards.

498 Mr. W. North. The Influence of

Mean Body-Weight, Pulse, Respiration, sad Temperature.
Experiments, February 13 to March 2, 1883.

Table G.
2, Pulse. Respiration. Axillary
Date. ale a | cenapena.
je
weight. t
Deo, 3) ae nase say
Ibs. FE’.
February 13...... as 54 62 13 14°5 97-2
SR erent 132-87 | 54 |65°5112°5]14°5] + 96-5
55 VO ieee, plod oie pi tow 65. 14 14°56 96°3
Op UG se gee ool alo, 56 13 14 97-0
a igre ie 1383°25 | 61 51
; DOE econo 133 °25 ee seta alles wom alee 97 35
Ope Jal AL SSE OO El aaizon| 164: 14.°5 oe 96°70
me 20.2455.) 1847507) 03 48 13 145 96°85
- 21......| 135°25° | 49°5 | 52 13°56 | 15 97°35
59 Pup eB ay 1384°37 | 52°5 | 64 12 .s 96°95
DEO el aa 00 Al 49 Sieh oi
fy odes Se Sa Niel 258
aS 25 & 26..| 132 °50 oe 5 12°5 a0 97 °35
ibe De oe Gals Toga 64 veal s 97°80
if Z8eisven ciel eaOuZo
March 1&2.../ 131°50 | 52 be 12 we 97 -05
Averages ..... 132-90 | 52°6 | 58°7 | 13 14°4 97°03
|

Division I. February 5th to February 15th.

The nitrogen of the urine from February 5th to February 10th
inclusive, presents very little that is worthy of remark, unless it be
that the sixth and seventh were apparently days of small elimination,
the ninth and tenth of moderate, and the eighth one of excessive
discharge. The daily average from February 5th to February 10th
inclusive was 14°94 grams; the averages of the experiments of 1882
were as follows :—

I. 15:03 grams.
EE WA O2e iT wok
LIA SS 3,

giving an average for the three experiments of 14°74 grams, showing
I think that my assumption that the diet during the Ist division of
the 1883 experiments was very nearly the same as the special experi-
mental diet, is justifiable.

On February llth, a day of fast, the discharge by the urine was
9°63 grams, on February 14th 9°30 grams, on February 15th 9°26 grams,
on February 27th 8°66 grams; also days of abstinence from food.

Bodily Labour upon the Discharge of Nitrogen. 499

It is curious to observe how on these days of fast, despite different
circumstances, and the fact that the fast of February 15th was pre-
ceded by a fast on the previous day, how great is the similarity in
the daily discharge, for again on July oth, 1882, a day of fast pre-
vious to commencing an experiment, the discharge was 9°10 grams,
and on July 17th, at the conclusion of the same experiment, 9°46 grains
were discharged.

This gives an average discharge on fast days of 9°23 grams of nitro-
gen by the urine.

Now turning to the table showing the daily balance of nitrogen in
the food and excreta, we find in the first part of this experiment that
assuming, as I have endeavoured to show we have some right to
assume, that the daily ingestion of nitrogen was practically the same
as during the experimental diet, it will be seen that I started with
a deficit of 0°69 gram, which became a halance of 3°V1 grams on
February 10th. After considerable fluctuations on the 8th and 9th,
the fast of February 11th reduced the balance to a deficit of 8°37 grams,
that is to say, 11°38 grams were removed from the body, and it is a
very extraordinary fact, though I fear accident has something to do
with it, that the total nitrogen discharged on February llth by urine
and feces amounted to 11°38 grams precisely. Supposing this to be
a fact, and not a mere coincidence, the whole of the nitrogen excreted
on February 12th should be represented by the difference between
the supposed ingesta and this deficit of 11°38 grams, that is to say,
6°26 grams is all that the body can afford; but this is not the ease.
In this case as in other instances the deficit is not made up at once,
but slowly; 1:94 grams were retained on February 12th, and
1:85 grams on February 13th, thus reducing the deficit to 4°58 grams.
On February 14th the fasting raised it again to 15°16 grams, and the
fast of February 15th to 24°42 grams, and this closes the first period.

Whatever may be the value of calculations based on this hypothesis
of similarity of nitrogenous ingestion, it is, I think, only fair to
assume that there was a deficit, put it even as low as 10 grams. On
February 15th I began the experimental diet, with the exception of
so muchas reduced the daily ingestion of nitrogen to 17°05 grams, and
despite the apparent needs of the body, out of 17°05 grams taken in,
16°65 grams were discharged. Again on February 17th the deficit
reached its maximum of 25°16 grams, gradually diminishing up to
February 24th, when it amounted to only 9°68 grams, whilst on
February 25th the excretion was so small, that the deficit fell to
499 grams, to be increased on the following day to 5:29 grams. The
fast of February 27th brought it up to 13:95 grams, which was
reduced on March Ist to 6°21 grams, rose again tu 7°30 grams on the
2nd, and fell to 5°50 grams on the 3rd, the concluding day of the
experiment,

500 Mr. W. North. The Influence of

Variations from the Experimental Diet, February 16 to March 2.
Experiments, February 16 to March 2, 1883.

Date. Quantity.| Food. | Nitrogen.| P,Q5. | HSO,. | NaCl.

grams.
Feb. 16.. 60 Potato 0°586 0 °295 0°126 | 0°306 Omitted
abe WAS 200 Flour 3 °4038 0 °680 0-032 as Omitted
eae ne 10. | Milk 0:147 | 0-070 | 0-003 | 0-403 | Added
-|Mar. 2.. 20 Julienne| 0°354 0:162 | 0:°088 | 0:057
eo) i> 30. uluNlcnt 4065 | 0°567 | 0-018 | 0-051 | $ Omitted
Bt: are 20 Potato 0-192 0:098 | 0:022 | 0:102

I may here remark that the total nitrogen value of the food omitted
on February 16th and 17th, and on March 2nd, was 8°60 grams; exact
particulars are stated in the table already given. So that had the full
diet been taken on these days there would have been a balance of
3'1 grams in the body, or rather it would have been possible. Durimg
the whole of the latter part of this experiment, that is from Feb-
ruary 10th onwards, my sensations were such as I have learned to
associate with the repair of waste, and it would have been exceedingly
interesting to have continued the experiment yet another ten or twelve
days, in order that I might have had the opportunity of investigating
the effect of muscular labour, or of starvation upon my body, at this
time presumably in a state of nitrogenous equilibrium.

I do not feel justified in again subjecting myself to prolonged star-
vation, that is to say starvation extending over four or five days; but
I think that similar results can be obtained, as far as the nitrogen is
concerned, by mere twenty-four hours’ abstinence from food, provided
that the discharge of nitrogen has been observed for a sufficiently —
long time previously, and has been so regulated that we can with
some degree of certainty assume that there is a deficiency of this
readily dischargeable nitrogen in the body. That there would be a
considerable discharge of nitrogen there can be no doubt, but the
source of it could hardly be the same as in the well- or I might say
over-fed body.

It is, I think, a somewhat extraordinary fact that, on the assump-
tion we have made that the nitrogenous value of the diet from
February 5th to February 15th was about the same as the expe-
rimental diet, with a deficit of 15°16 grams, a further starvation
of twenty-four hours should have produced almost identically the
same result as a day’s starvation, taken haphazard on the day on
which I chose to begin an experiment, such as was the case in Expe-
riment II[ of 1882. I do not wish to invest this fig. 9 with any
undue importance; but it certainly appears to represent some definite

Bodily Labour upon the Discharge of Nitrogen. 501

condition, and I shall not be satisfied that this is not the case until J
have examined the effect of living for several days on a diet whose
daily nitrogenous value shall be only 9 grams, the other consti-
tuents remaining as far as possible the same. 1 should expect to find
that twenty-four hours’ starvation would result in a discharge of a
smaller quantity of nitrogen, say 5 grams, which might be found
to be tolerably constant under similar conditions. When this had
been determined, two or three days of a non-nitrogenous diet would
probably suffice to indicate approximately the daily nitrogenous
waste of the body from other sources than food. We have no infor-
mation of any importance as to the minimum of nitrogen required by
the body daily in order to maintain it in health, and I feel sure that
experiments on the plan indicated would throw considerable light on
the subject.

Conclusion.

- The results which have been now put on record, whilst they con-
firm the conclusions of Dr. Parkes, show that the disturbance pro-
duced by very severe labour is much more immediate and of much
greater intensity than that which Dr. Parkes observed, the expla-
nation obviously being that in his experiments the exertion imposed
on the soldiers who were made the subjects was inadequate.

It has been further shown that, just as in Dr. Parkes’ experiment
on the effect of privation of nitrogenous food, the diminution of the
nitrogen stored in the system was followed by retention, 7.e. by a
state of things in which the intake was greater than the output; so
after the disturbance of the nutrition of the body, which is produced
by severe labour, the immediate effect of which is obviously to dimi-
nish the store of nitrogenous material in the system, there follows a
corresponding diminution of discharge, so that the result is the
same, namely, that in Dr. Parkes’ words, “an insufficient supply at
one time must be subsequently compensated,” whether the insuf-
ficiency be due either to privation or to exercise.

A third result of importance is this: that this storage of nitrogen
is the expression of a tendency of the organism to economise its
resources, which is much more constantly operative than has hitherto
been supposed.

Thus it appears that whenever the subject of experiment was put
upon the regulated experimental diet, without the imposition of more
exercise than belongs to an ordinary active life, accumulation took place
even when the daily supply of nitrogen did not exceed 17°6 grams,
an amount which cannot be regarded as more than adequate to the
normal requirements of the organism. This tendency to store
nitrogen is therefore a normal endowment of the living body, and,
if so, the “retention” which follows starvation or exercise must be

‘ ee
502 Influence of Labour upon the Discharge of Nitrogen.

regarded as a mere exaggeration of this tendency, and not as a new
process which is set up in the living tissue to compensate for a pre-
vious disturbance.

In this, as in other respects, it is obvious that the knowledge which
has been gained is only partial.

If, with a nitrogenous income of 17°6 grams per diem, accumn-
lation takes place under normal conditions of life, the minimum
adequate supply of nitrogen must be below this. We have no means
of stating at present what this adequate supply is, but we have
reason to believe that it would be found to differ materially in dif-
ferent individuals, and in the same individual in different states of
health. If we could ascertain to what point the supply of nitrogen
in any individual could be diminished, without drawing upon his
store of nitrogenous material, we should have in this result a perfectly
reliable chemical criterion of what may be termed nutritive vigour.

No attempt has hitherto been made to carry out such observations
on the human subject, nor do any experimental data exist which
would justify even a guess at what the results of a properly conducted
investigation would be.

What is first required is to ascertain for how long and in what
quantity nitrogen continues to be stored on the diet already men-
tioned, the period of observation to be at least a fortnight. This
having been accomplished, the next step would be to repeat the
observation with diets containing less nitrogen than the amount
above stated, but otherwise similar to it.

We should then be in a position to inquire how far the increase of
nitrogenous output, which has been shown to be the immediate
result of labour, is dependent on previous storage, and whether, in
conditions of nutrition which involve absence of storage, the effect
of severe labour manifests itself in an increased discharge, and finally
whether in this case such work can be undergone without producing
other disturbances.

A collateral inquiry, which is scarcely less necessary than that
which has just been indicated, must as soon as possible be under-
taken as to the effect of varying the relation between the time at
which food is taken and that at which the work is done.

It has not yet been possible to attempt to enter on this a
which obviously could not be combined with any other. Its import-
ance lies in this, that it would, if successful, afford information as
to the question whether or not the organism is capable of at once
applying the nitrogenous material of food to meet increased expen-
diture determined by work.

In the investigations hitherto conducted by me the work done has
consisted exclusively of walking. Ata future period I hope to sub-
stitute other methods of labour, the employment of which will render

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The Influence of Strain on the Properties of Matter. 503

it possible to vary, as may be expedient, not merely the amount of
work done per diem, but the distribution of the work in time. In the
_yealisation of this purpose I anticipate great advantage from the use
of the work machine, which I have been able to construct for the
purpose of my inquiry by the liberality of the British Association.

In conclusion, I would draw attention to the results relating to the
influence of work on the discharge of phosphates and sulphates by
the urine.

As regards phosphates, 1t has been shown that no increase occurs
unless the exertion is very severe. As regards sulphates, it mani-
fests itself distinctly in many cases, the output of sulphates being in
general terms proportional to that of nitrogenous material.

It is a matter of regret that the total sulphur of the food was not
estimated. It is known that the percentage of sulphates contained
in the food was insignificant as compared with that excreted in the
urine, and consequently almost all of the discharge must have been a
product of oxidation.

I beg, in conclusion, to state that the expenses of the present
research, which have been extremely heavy, have been defrayed by a
grant of the British Medical Association. I desire to express to —
the Association my most grateful thanks.

“ The Influence of Stress and Strain on the Physical Pro-
perties of Matter. Part II. Electrical Conductivity (con-
tinued). ‘The Alteration of the Electrical Conductivity of
Cobalt, Magnesium, Steel, and Platinum-iridium by Longi-
tudinal Traction.” By HERBERT TomLINnson, B.A. Commu-
nicated by Professor W. GRYLLS ADAMS, M.A., F.Ross
Received October 7, 1884. Read November 20.

The Alteration of the Electrical Resistance of Cobalt produced by
Longitudinal Traction.

In a previous communication to the Royal Society,* I pointed out
that whilst with iron the electrical resistance is temporarily increased
by temporary longitudinal traction, that of nickel is decreased, pro-
vided the stress be not carried beyond a certain limit, and this, too, in
spite of the change of dimensions, namely, increase of length and
diminution of diameter, which follow from the stress. J further
showed+ that there is a marked resemblance between the table of
“rotational coefficients”? drawn up by Professor Hall and that laid
down by myself from the results of experiments on the effect of

* Phil. Trans:,:’ vol, 74,9: 58.
t+ Loe. cit., p. 168.

504 Mr. H. Tomlinson. The Influence of

mechanical stress on the specific electrical resistance of metals. A’
comparison of the two tables shows, that with the exception of plati-
num the metals stand in nearly the same order in both, and that iron
and nickel are very conspicuous, the former at the top and the latter
at the bottom of both lists. 3

Mr. Shelford Bidwell has also brought forward* very strong eyi-
dence in favour of his assertion, that the “ Hall effect”? can be ex-
plained by the joint action of mechanical strain and certain “ Peltier
effects,” and has shown that those metals in which the ‘“ Hall effect”
is positive are rendered by temporary traction thermo-electrically
negative to pieces of the same metal unstretched. It seemed, then,
a matter of considerable interest to ascertain whether cobalt would
act like iron or nickel as far as the effect of stress on the electrical
resistance is concerned, and I endeavoured—for some time in vain—
to obtain either wires or strips of cobalt suitable for the purpose in
view. At leneth, through the courtesy of Mr. Wiggin, jun., Birming-
ham, I found myself in possession of two stripst of cobalt, upon which
I was able to make the necessary experiments.

Preliminary Determination of the Value of “* Young’s Modulus,”
Density, Sc.
The length of each strip was 58°4 cm., and the thickness and width
of one of them, when gauged at ten places at equal distances apart,
were as follows :—

Number of Thickness in Width in Section in square
observation. centimetres. centimetres. centimetres.
1 0° 0864 0°7091 0:06127
2 0:0870 0:7076 0 -06156
3 0 :0851 0°7131 0 -06069
4 0 °u858 0:°7104 0 °06095
5 0 ‘0857 0 -7282 0 06241
6 0 :0848 0°7250 0:06148
7 0 -0850 0:7326 0 06227
8 0 -0849 0°7557 0:06416
9 0 :0846 0° 7556 0 06392
10 00854 | 0°7474 0 -06383
Meare 608547 | 0:72847 0 -06226

The strip was therefore fairly uniform in section throughout, the
mean value of the section as determined by the gauge being 0°06226
square centimetre.

* “ Phil. Mag.,” April 1884, p. 249,

+ Mr. Wiggin informed me that he found it impossible to draw wires of cobalt,
as the metal was so hard that it destroyed the tools with which it was brought into

contact. Messrs. Johnson and Matthey were also good enough to attempt to draw
for me wires of cobalt, but they too failed through a like cause.

Stress and Strain on the Properties of Matter. d05

The density of the metal was determined by means of a specific
gravity flask, some pieces having been previously broken off for the
purpose, and was found to be §'231 at a temperature of 16° C. The
same pieces were well annealed, and the density at 16° C. was then
found to be 8°259. The mean section as determined from the mass of
the strip 29°65 grams, the length, and the density, was for the unan-
nealed metal 0°06168 square centimetre, and this value, agreeing as
it did fairly with that got by gauging, was assumed to be correct.

The modulus of longitudinal elasticity was determined by holding
the strip in the centre and rubbing it along its length with a resined
glove. The note obtained was very high in pitch, but the results of
the measurements of the number of vibrations obtained by the use of
the syren agreed very well with each other.*

Hzperiment I.

The lower double octave obtained by rubbing the strip longitudi-
nally was taken on a monochord; the syren was then raised to the
pitch of the monochord, and the number of vibrations counted for
two minutes at a time.

Number of Number of vibrations recorded
trial. by the syren in two minutes. |
Peat eu WN 09 Np et. is idea ai
1 6286 x 20
2 S273) x:
3 6273
VE SRR eee ehicre cterets 6277 x 20

In this experiment the monochord was retuned twice, and it will be
observed that the mean value does not differ from any of those forming
it by so much as 0°15 percent. From these last observations the value
of “‘ Young’s modulus ”’ for the unannealed cobalt was ascertained to be
2005 X 10° grams per square centimetre. The same strip was then
well annealed, and three results, equally as concordant as the last,
were obtained when the strip was thrown into longitudinal vibrations.
The value of ‘‘ Young’s modulus” of the metal in the annealed con-
dition was 1817 x 10° grams per square centimetre.

Arrangement of the Cobalt Strips for Observation on the Alteration of
Resistance produced by Longitudinal Traction.
The two strips (see fig. 1) in the first instance in the unannealed con-

* T have again to thank Mr. Furse, of King’s College, for his assistance here.
VOL. XXXIX. 2 1

506 Mr. H. Tomlinson. The Influence of

i,
Ti om
UE

ea

dition, passing through two apertures in a table, were secured at their
upper extremities to two clamps, A, and the lower extremity of the
one to be stretched was fastened to the clamp B, over which passed
the double hook 8, connected with a stout lever of hard wood. A
scale-pan weighing 2 kilos. was suspended at the end of the lever,
and by loading and unloading this very carefully the strip was sub-
jected to any required alteration of stress. Short pieces of insulated
copper wire were soldered to each strip at D, and the junction, C, of
these pieces was united with one terminal of the galvanometer. Two
other pairs of similar wires were soldered at K, and one of each pair
was connected as usual with resistance coils, and the other with one
pole of a single Leclanché cell. The two sets of resistance coils, which
in this case were about 10 ohms each, were united by a platinum-
iridium wire traversed by a sliding-piece connected with the other
terminal of the galvanometer. The mode of experimenting was pre-
cisely the same, and the same precautions were taken as in the earlier
experiments.*

When the strip had been sufficiently tested in the unannealed con-
dition it was well annealed, and in this new condition again experi-
mented on; but whereas before the stress used was not sufficient to
cause any permanent elongation, the strip was now permanently
lengthened and the permanent alteration of resistance thus caused
was measured as well as the temporary alteration. The following
experiment was made on the annealed metal when stressed for the first
time after the annealing.

* Loe. cit., p. 45 and p. 54.

Stress and Strain on the Properties of Matter. D07

Hapervment II.

Alteration of
resistance in

terms of divi- Total
Position sions of the ae aa permanent
Load of platino-iridium ameration | alteration ny Bee ,
ae | eliding- |) wire, resistance We wi Me
piece. — signifies ae resistance
decrease of ; =P.
resistance on
loading.
0 103°0
2 99°0 — 4°0 — 4:0 0 —2 00
4 95-0 — 8:0 — 8:0 0 — 2°00
6 93-0 —10°:0 —12°0 | + 2°0 | —2°00 | +0°33
8 93-0 —10°0
10 93°0 —10°0
12 98°5 — 4°5 —21'°5 | + 17°0 | —1:90 | +1°42
8) 120°0
2 118°0 — 2°0 — 2°0 + 17:0 —1:°00
a 115°5 — 4:5 — 45 | + 17:0 | —1°'18
6 113 °5 — 6°5
8 112°5 — 75
10 111°5 — 8°5
12 112 °0 —- 8:0
14 116 0 — 4-0 —20°0 | + 33°0 | —1°43 | +2°36
0 136 -0
4 133 °0 — 3°0 — 3:0 + 33°0 —0°75
8 130 °0 — 6:0 — 6:0 | + 33:0 | —0°75
12 128 °5 — 85
16 136 :0 0 —23°0 | + 56:0 | —1°44 | +3°50
0 159 °0
i 156°0 — 3:0 =O + 56°0 —0°75
8 153 °0 — 6:0 — 6:0 | + 56:0 | —0°75
12 152°0 — 7:0
16 154-0 — 5°0
18 160-0 + 1:0 —23°5 + 80°5 | —1°32 | +4°47
0 183 °5
4 181°5 —1 2-0 — 2°0 + 80°5 —0°50
8 178 °5 — 5:0 — 5°0 | + 80°5 | —0°63
12 178-0 — 5°5
16 179°5 — 4:0
20 190-0 + 6°5 —25°5 +112'5 | —1°28 | +5°63
0 215 °5
4, 213 °5 — 2:0 | — 2°0 | +112°5. | —0-50
8 210°5 — 5:0 — 50 | +112°5 | —0°63
12 209 °5 — 6:0
16 210°5 — 5:0
20 215°0 — 0°5
22 223 0 + 7°5 — 28°0 +148°0 | —1°27 | +6°73
0 251 °0
ZO) 66°0 |
4, 68°5 — 2°5 — 2°5 +148°0 | —0°63
8 71:0 — 5:0 — 5:0 +148°0 | —0°63
12 72°0 — 6:0
16 71°5 — 5°5
20 69°0 — 3'0
22 65°5 + 0°5 —24°5 +173°0. | —1:11 | +7°86
0) 41°0

* Resistance coils readjusted.

pM ae,

508 Mr. H. Tomlinson. The Influence of

In this experiment the numbers given for the load represent the
number of kilograms on the end of the lever,* and, when multiplied by
4908, will represent the actual stress on the strip. After a rest of two
days with all the stress off, except that produced by the weight of the
lever itself,+ the resistance had decreased, so that the sliding-piece
had to be shifted from 41 divisions to the right of the zero-point to
45 to the left, or through 86 divisions ; so that the total permanent.
increase of resistance was now represented by 87 divisions instead of
173 divisions. The strip was now tested again with the following
results :—

Hapervment ITI.
|

Alteration of |
| Yesistance in Total |
terms of the Temporary A |
1, “4° divisions of the | alteration | P&rmanen |
oad. Position of Sees s¢ alteration f
SW. agen platino-iridium of ¢ —-
! 3 ling-piece. sf f : 0 WwW |
wire. signifies | resistance | tance
decrease of =i) an |
resistance on in
loading.
) 45 left *%s S + 87
4 48, 2) Br 27350 +87 —0°75
8 BLY bee — 6°0 — 6°0 + 87 —0°75
| phen Bade —~ 60
16 50 |. ~— 5:0
20 48 ,, — 3°'0 —22°0 +136 —1°10
0 26),
20 Bates — 8:0 —21-0 +1198 -| —1-05
0 ie ae
20 Pipes a — 8:0 —21-0 +132) ‘| —i05
0 0 »
20 10%;;; —10°0 —20°0 +142 —1-00
0 10 right |
20 2 left —12°0 —20°0 +150 —1°00
0 18 right
feype74 6) ites —10°0 —19°0 +189 —0°95
ie n0 cy adie
20 16); —11-0 --19°0 +167 —0°95
| 0 Bik Ger aul
20 ne | he - +175
| 0 43,

|
|

* Including the weight of the scale-pan itself.
+ This was nearly equal to a load of 1 kilo. on the end of the lever.

}

Stress and Strain on the Properties of Matter. 509

20 kilos. were now put on the lever and taken off again six times
in succession.

Alteration of
resistance in

terms of the Temporary | Permanent
Teena Poation ce ee He the eee oe ah
=W. | sliding-piece. | P sumone lua 5 ie Ww
wire. — signifies | resistance | resistance
decrease of =T. =P
resistance on
loading.
0 77-0 right os ule + 209°0
*16 64:0 ,, —13°0 | —14°0 +210°0 | —0°875
0 ZouO: t5
12 68°0 ,, —=10°0 —11°0 +211°0 | —0°917
0 OSs
8 M20) acs - 7:0 — 6°5 +210°5 | —0°813
0 1855 24;
4 74°35 ,, — 4:0 — 4:5 +211°0 | —1°125
0 72°0 =,,
4, oO. 5 — 4:0 — 4:0 +211°0 | —1-:000
0 790;
4, OKO: 55 —- 3°0 - 40 +212°0 | —1:°000
0 80°0_,,
A 75°35, — 4°5 — 3°5 +211°0 | —0°875
0 7S)
4, To0 5 — 4:0 — 3°5 +210°5 | —0°875
0 (hes) aa
8 Ta20"" ; — 65 — 7-0 +211°0 | —0°875
0 f920) =,
8 G20) 55 — 6°5 — 7:0 +211°5 —0°875
0 SOR re
12 HOO", — 9°5 —10°5 + 212°5 —0°875
0 80°5__,,
12 LOGO), —10°0 —10°5 +213°0 | —0°875
Oe sto,
16 GOs05, —12°0 —14°0 +215°0 | —0°875
0 Saj0y,,
20 GeO, —12:0 —17°5 +220°5 | —0°875
0 88°5. ,,

Remarks on Huperiments IT and ITT.

From the third column of Experiment II may be gathered that the
resistance of the cobalt decreases up to a certain degree of loading, and
then begins to increase. The maximum decrease becomes less and
less, at first rapidly, and then more slowly as the permanent strain
due to the loading becomes greater and greater until a load of 18
kilos.* had been employed. The point of loading at which the
maximum decrease occurs becomes higher and higher, gradually
increasing from 8 kilos. to about 13 kilos.

* This does not include the stress due to the weight of the lever.

510 Mr. H. Tomlinson. The Influence of

The sixth column shows that the temporary alteration of resistance
is of the nature of a decrease, but the decrease becomes less and less
as the permanent strain increases, at first rapidly, and afterwards
more slowly, until the load of 18 kilos. has produced its permanent
effect. Moreover, we learn from this column that when a load of
12 kilos. had been employed the temporary effect per kilogram is
always greater for the highest load than for the smaller ones, so that.
for the loads 16, 18, and 20 kilos., when employed for the first time, we
get about twice the temporary decrease per kilogram which is obtained
with the loads 2 and 4 kilos. Experiment III, however, teaches us.
that ultimately, when all the loads have been applied a great number
of times, the temporary decrease 1s exactly proportional to the load in the
case of the loads 4, 8, 12, 16, and 20 kilos., nor is there any sign, as
was the case with nickel, that the decrease of resistance would
ultimately be changed to increase when the stress was increased
beyond a certain limit. The greatest total stress on the strip,
including that caused by the weight of the lever itself, was 1860 kilos.
per square centimetre, whereas with nickel the point of loading where
the above-mentioned limit was reached, was about 1500 kilos. per
square centimetre.* It would seem probable that there is a limiting
stress beyond which, as in nickel, the resistance begins to increase
with the load, but it is evident from what has been said that this
limiting stress is much higher for cobalt than nickel.

From the last values recorded in the sixth column of Experiment
III it was calculated that the decrease of resistance per unit produced
by a stress of 1 gram per square centimetre at the temperature
of 16° C. is 3886°8x10-!*. The ratio of the decrease of resistance
per unit to the increase of length per unit}? is 0°703, and, if we
assume the ratio of lateral contraction to linear elongation to be
0-250, the ratio of the decrease of specific resistance per unit to the
increase of length per unit of the stress is 2°203. All the values
just given are much less than the corresponding ones in the case of
nickel. |

With the cobalt in the unannealed state temporary traction also
produced decrease of resistance, but, as might be expected from what
has been said above with reference to the effect of permanent strain,
the amount of decrease per unit was less than with the annealed
metal.t The decrease of resistance per unit produced by a stress of

* Loc. cit., p. 60, where the stresses given should be increased by that caused
by the weight of the scale-pan if the total stress on the wire is, as in this case,
required.

“y a : a where R is the resistance and AR is the decrease of resistance which
results when the length, 7, is increased to 1+ Al.

t Notice the similarity in this respect between cobalt and nickel. Loc. cit.,
p- 61.

Stress and Strain on the Properties of Matter. d11

1 gram per square centimetre was for the unannealed cobalt
242°3x10-!. The ratio of the decrease of resistance per unit to
the increase of length per unit is 0°486, and the corresponding ratio
in the case of specific resistance is 1°986.

Not only is cobalt remarkable for having, like nickel, its resistance
decreased by longitudinal traction, in spite of the increase of length
and diminution of section which is caused by the stress, but it also
presents a peculiarity not seen in nickel or indeed in any of the
other metals hitherto examined, namely, the extreme persistence with
which the same load when appled again and again continues to
produce permanent increase of resistance. With few metals is this
persistence anything like so noticeable with such stresses per square
centimetre as have been here employed, for we may observe from the
last two experiments that though a load of 22 kilos. had been twice
used on the lever, and afterwards a long rest given to the strip,
20 kilos., after having been put on and taken off fifteen times, still
continued to produce permanent increase of resistance.* Even
16 kilos. continued to produce a permanent effect, so that it would be
only after a very large number of loadings and unloadings that the
increase of resistance on taking off the load would be equal to the
decrease of resistance on putting on the load. The permanent
increase of resistance caused by the above-mentioned loads also was
greater the longer the time during which the stress was maintained.

The Effect of Permanent Longitudinal Extension on the Specific
Resistance of Cobalt.

We have seen that cobalt behaves like nickel as far as the effect on
the specific resistance of temporary longitudinal stress is concerned,
and that both iron and nickel} are decreased in specific resistance by
moderate longitudinal strain. This it appears is the case with cobalt
also. The distance between the points where the copper wires at the
upper and lower extremities of the cobalt strip were soldered,
was before stretching 49°8 cm. and after the stretching 50 cm.
The specific resistance before the stretching was 2289 x 10-8, and
after the stretching 2231x10-, so that there was a decrease of
specific resistance of 2°6 per cent. for a permanent lengthening of
1:8 per cent. The permanent decrease of specific resistance per unit
divided by the permanent increase of length per unit, is for iron
0:02, for cobalt 1:44, and for nickel 2°37; so that the permanent

* This was afterwards found to be the case when the same load had been put on
and taken off some fifteen times more.

+ This “running down” isalso explained with other metals, but not to the same
extent, as regards persistency with such comparatively small stresses per square
centimetre.

t Loe. ecit., p. 100.

512 Mr. H. Tomlinson. The Influence of

decrease of specific resistance as well as the temporary decrease is
greater with nickel than with cobalt.

The Effect of Longitudinal Traction and of Longitudinal ae
on the Thermo-electric Properties of Cobalt.

It will be seen that contrary to the expectation of myself, who had
regard to the relationship which apparently exists between the
‘rotational coefficient’ of Hall and the alteration of specific resis-
tance caused by traction, cobalt behaves like nickel and not like iron.
I now, therefore, turned to examine the effect of traction on the
thermo-electric properties of the metal, for the purpose of ascer-
taining whether the strip would act in respect to these properties
like iron or nickel. According to Bidwell* cobalt acts like iron, but
it appears that this experimenter did not subject his bar of cobalt to
traction but to torsion, and finding that copper under torsion behaved
similarly to copper under longitudinal traction, assumed that cobalt
would do so likewise. The above-mentioned assumption is hardly, I
think, justifiable, and the following experiments show that cobalt is
altered by traction in a manner similar to nickel, provided the metals
are not at the same tume under the influence of any magnetising stress.

Hepervment IV. :

The two strips of cobalt in the unannealed condition were clamped
together at their centres, the clamp projecting to a distance of about
8 inches from and at right angles to the strips. One of the strips
could be stretched as before by means of the lever, and insulated
copper wire soldered near the lower extremities of the two strips
served to connect them with the galvanometer. The clamp was then
heated at the extremity furthest away from the strips, and the heat
conducted along the clamp to the strips was such that in a short time
a temperature, as judged roughly by the touch of about 60° C., was
attained, stress of moderate amount was then put upon the lever, and
this caused a current from stretched to unstretched through the
heated junction: consequently stretched cobalt is thermo-electrically
positive to unstretched cobalt. As soon as the needle of the galvano-
meter was fairly steady, the stress was removed and a deflection in
the opposite direction ensued. The temporary stretching and un-
stretching were repeated several times, but always with the same
result as regards the direction of the deflection. The unannealed

cobalt therefore under mechanical stress behaves thermo-electrically
like nickel.+

* “ Phil. Mag.,”’ April 1884, p. 261.

+ In this experiment the strips were under the influence of the earth’s vertical
magnetic stress, but this last is so much smaller than that due to the helix, that I
have not deemed it necessary to take it into account.

Stress and Strain on the Properties of Matter. 513

Heperiment V.

The strips were now dismounted and the same one as had been
used before was placed in the axis of a magnetising helix,* especially
designed to prevent the heat of the helix from reaching the metal to
be magnetised. The two ends of the strip, which projected about
8 inches from either end of the helix, were connected with the galvano-
meter, and the clamp before used was now at one end of the helix and
just outside. The temperature was raised to about 60° C., and as
soon as the galvanometer needle had become fairly steady the helix
was excited by a single Leclanché cell.| A deflection of the galvano-
meter needle at once indicated a current from unmagnetised cobalt to
magnetised cobalt through the hot junction, and proved that longi-
tudinally magnetised cobalt is negative to unmagnetised cobalt. The
unannealed cobalt, therefore, under magnetic stress, behaves thermo-
electrically in a manner similar to iron. The helix in this experi-
ment was too far from the galvanometer to affect the latter directly,
and a reversal of the magnetising current produced a thermo-electric
current in the same direction as before. The magnetising force was
in this case equal to 4x7 x 90°6 x 0°478 x C in absolute units, where C
expresses the magnetising current in absolute units. The electro-
motive force of the cell was 1°5 volts very nearly, and the resistance
1:5 x 108
1-8 x 10°
absolute units, and the magnetising force 43°9 absolute units.

This last result has an important bearing on the question whether
Bidwell’s explanation of Hall’s phenomenon is correct, because,
though unmagnetised cobalt is certainly rendered thermo-electrically
positive by longitudinal mechanical stress, the case may be different
when the metal is magnetised, as in Hall’s experiment.t

Nor indeed would it be safe to assume, without further experiment,
that mechanical stress will produce the same effect either in nature
or amount on the electrical resistance§ or on the thermo-electric pro-
perties of magnetised iron, nickel, and cobalt, as it does on the same
metals when not under the influence of magnetic stress.

in circuit 1:8 ohms, consequently the value of C would be

Haperiment VI.

The strip of cobalt used in Experiments IV and V having been
annealed, was tested as befure for the effect of mechanical stress on

* For a description of this helix, designated as “the coil B,” see loc. cit., p. 136.

+ One of the more recent kind, and which gives a fairly constant current.

~ See Sir W. Thomson’s paper on “‘ The Effects of Stress on the Magnetisation
of Iron, Nickel, and Cobalt,”’ ‘‘ Phil. Trans.,” vol. 170, 1879.

§ I may not, therefore, be right in my conjecture (see ‘‘ Note on Hall’s Pheno-
menon,” ‘“ Phil. Mag.,” May 1884, p. 402) that in all probability the “ Hall
effect”? on nickel will be diminished by raising the temperature to 100° C.

514 Mr. H. Tomlinson. The Influence of -

the thermo-electric properties of the metal. The heating was, how-
ever, in this case accomplished by means of an air-chamber, consist-
ing of two concentric brass cylinders with a layer of water between
them. The strips were placed, clamped together at their centres, in
the axis of the chamber, the two extremities of each projecting about
8 inches from either end of the chamber; a thermometer was also
placed with its bulb in the centre of the latter, and the temperature
in the first instance raised to 100° C. When the needle of the
galvanometer was at rest, a load of 8 kilos. was put on the lever, and
after a space of 2 minutes had elapsed a deflection of three divisions
of the scale resulted. This deflection again showed the stressed metal
to be positwe to the unstretched, and on the removal of the load the
needle came back again to nearly its old position. Trials were made
with several loads from 2 to 8 kilos., and always with the same result
as regards the nature of the effect; the mean value of the deflection
per kilo. being as nearly as could be judged 0°375 division of the
scale. The electromotive force developed by the highest load was
found to be 0°429 microvolt, and the electromotive force which would
be produced by a stress of 1 gram per square centimetre would be
659 x 10—? microvolts, the temperature of one junction being at 100° C.
and of the other about 16° C. The chamber was next permitted to
cool down, first to 60° C., and afterwards to 42° C., and at both these
temperatures the effect of the stress was found to be in the same
direction as before, and though no attempt was made to measure the
actual deflection, this was evidently diminished with the temperature.
Finally, it should be added that both in this experiment and in the
two previous ones, the extremities of the strips and the clamps at the
ends of the stressed strip were all well shielded from the source of
heat. Jt would seem then that we have good reason for concluding
that for any temperature between 16° C. and 100° C., cobalt, whether
in the annealed or unannealed condition, is rendered by traction
thermo-electrically positive to unstretched cobalt.*

The Lffect of Hxcessive Loading on the Electrical Resistance of Hard

Piano-steel.
Kaperwment VII.

I have already shown} that for moderate amounts of stress the
effect on the electrical resistance of piano-steel is of the same nature
as the effect on iron, but, as according to Mr. H. Johnson,f{ the

* As I thought that want of purity might influence the result, Mr. J. M. Thom-
son of King’s College kindly made an analysis of two small pieces of the metal, and
informed me that they contained more than 98 per cent. of cobait, no trace of nickel,
and barely a trace of iron.

+ Loc. cit.

t “ The Electrician,” May 17th, 1884.

*

Stress and Strain on the Properties of Matter. 99 a)

specific resistance of hard piano-steel wire is temporarily diminished
by very considerable longitudinal traction, I arranged a pair of hard
piano-steel wires in the same manner as the nickel wires, of which
already mention has been made, and proceeded to test one of them in
the usual manner, expecting that whilst moderate stress would
increase the specitic resistance, excessive stress would diminish it.
The loading was accomplished by means of the lever before used, and
the results are given below :—

P Increase of resistance Increase of
ermanent 7 2 5 5
emporary produced by loading resistance per
load on the plea ARN NIE ‘
eae. load in kilos. in divisions of the kilo. on the
lever in kilos. tea wee ;
platino-iridium wire. lever.
1* 4, 160 40:00
1 6 242 40°33
7 6 240 40 :00
13 6 242 40°33
We anie eran onclns 40°17

It will be seen that the increase of resistance produced by the load-
ing is proportional to the load throughout. The diameter of the wire
was 0'08246 cm., and the greatest total load on the wire was equal to
102 kilos., or 2 cwts. The greatest stress per square centimetre was

above 19,000 kilos., and only a little short of the breaking stress.
From the above results was deduced that the increase of resistance
per unit produced by a stress of 1 gram per square centimetre, was
1620 x 10-2, and this number so nearly agrees with those obtained for
the previously used specimens of piano-steel, that it was not con-
sidered necessary to determine the value of “ Young’s modulus” and
of the simple rigidity, in order to prove that, as in soft iron, the
specific resistance is increased, not only when moderate stresses are
employed but also for stresses close to the breaking load.| This last
experiment, however, confirms the fact mentioned im an earlier paper,f
that the electrical resistance of steel is less increased than that of
iron, not only per gram stress on the square centimetre, but also per
unit increase of length.

* This is the load due to the weight of the lever itself.

+ T afterwards found that Mr. Johnson must have miscalculated the amount of
temporary lengthening produced by the load used by him, as he gives it as 3 per
cent., though the wire was not loaded beyond the limits of elasticity. This last is.
an impossible result, as the greatest tensile strength of any piano-wire does not
admit of a temporary elongation of more than 1°6 per cent. without breaking.

“ Proc. Roy. Soe.,”’ vol. 26, p. 401.

516 Mr. H. Tomlinson. The Influence of

The Hifect of Longitudinal Traction on the Electrical Resistance of
Magnesium.

Cobalt and nickel have been found to decrease in resistance when
subjected to moderate longitudinal traction, nor does it appear* that
this abnormal behaviour is in any way connected with the magnetic
properties of these metals. Nevertheless, it seemed desirable to find,
if possible, some metal which, possessing much feebler magnetic pro-
perties, would exhibit similar conduct. Now, judging from the
apparent relationship between the alteration of specific resistance
produced by traction and the “ Hall effect,” that magnesium might
be found to be such a metal, I obtained from Messrs. Matthey and
Johnson about 60 feet of magnesium wire, and examined it with the
above-mentioned object in view.

Preliminary Determinations of the Value of “ Young’s Modulus,”
Simple Rigidity, Density, &c.

‘“‘ Young’s modulus ”’ was, in the first instance, determined by the
method of longitudinal vibrations, a length of 550 cm. being under
examination. The wire was stretched on a long wooden box, and
precautions taken which will be fully described in a future com-
munication to the Society, to avoid certain sources of error incidental
to this method. The results obtained with the syren were quite as
accordant with each other as those got with the cobalt strip, and
from these and the value of the density obtained in the manner pre-
sently to be described, was deduced a value of ‘‘ Young’s modulus ” of
437°3 x 10° grams per square centimetre.

The simple rigidity of the wire was determined by the method of
torsional vibrations in the manner described in a former portion of
this memoir,t and proved to be 172°3x 106 grams per square centi-
metre.

Some little difficulty was experienced in finding the density of the
magnesium, as when the wire was immersed in water a very large
number of minute bubbles of gas—evidently a consequence of chemi-
cal action—made the apparent mass in water from 10 to 20 per cent.
less than it ought to have been. Most of these bubbles could be
shaken off by merely moving the wire twice or thrice backwards and
forwards through the water, but in a very few seconds they collected
again and rendered it evident that no reliable determination of the
“density could be obtained in this way. As there was not at hand any
liquid which might be suitably used in place of the water, the density
was ascertained from the length, diameter, and mass of three separate
lengths of the wire. The diameter of each of these pieces was mea-

* “ Phil. Trans.,”’ vol. 174, 1883, pp. 61, 62.
PLDC RCs Dene

Stress and Strain on the Properties of Matter. d17

sured at ten different places equidistant from each other by a gauge
graduated to 35th of a millimetre, and capable of measuring by
estimation to =,55th of a millimetre. The accuracy of the gauge had
been repeatedly tested on previous occasions, and could be depended
upon at least to ~,5,th of the diameter of the wire: nor would any
error of consequence be introduced in the determinations of either the
length or mass.
The following were the results :—

Mean |

Number Length in dij 4 Mass in Densitv at
: 3 lameter 1n of
of piece. | centimetres. . y grams. | 20° C.
centimetres.
1 162°5 0:08736 1°6910 | 1736
2 12320 0:°08671 1°2742 1°754
3 Ss 0:08723 1°3670 1°740
Meat rans chaise 0°08710 eS 1°743
|

The probable error in the determination of the density in this way
would therefore appear to be 0'2 per cent. But values of ‘“‘ Young’s
modulus ” obtained by the method of longitudinal vibrations are apt
to be slightly too high in the case of wires in consequence of slight
yielding of the supports at either end of the wire.* 1t was therefore
deemed advisable to employ also the static method, and accordingly a
pair of wires were suspended and examined in tite manner already
described in Part I of this memoir, and with the same precautions to
avoid error.t ‘“ Young’s modulus” as thus obtained proved to be
424-3 x 10 grams per square centimetre. It was impossible, however,
in this instance to have any but a comparatively small load perma-
nently on the wire, and in such a case the result is apt to be too low
toa slight extent. We may, I think, then, find a very near approach
to the true value by taking the mean between the values got by the
two methods: this mean is 430°8+10° grams per square centimetre,
and is, I should say, certainly less than 1 per cent. in error.

From ‘Young’s modulus” and the simple rigidity the ratio of
lateral contraction to longitudinal extension can be calculated ; this
ratio would be—

430°38 x 108 __
Dre 2eor MOG a,

* It might be thought that any kind of yielding would depress the pitch of the
wire, but the mathematical investigations of Lord Rayleigh as given in his “ Theory
of Sound,” vol. i, p. 161, show that with transverse vibrations there would be in
the case before us an increase of pitch. Rayleigh’s investigations will equally
apply, as far as the point in question is concerned, to longitudinal vibrations.

+ Loe. cit., pp. 2-4 inclusive.

518 Mr. H. Tomlinson. The Influence of
or O22 505)

The bulk-modulus can also be determined from “ Young’s modulus ”
and this last ratio, and is— :

430°8 x 106
3(1—2 x 02505)

= 287°6x10% grams per square centimetre.

Now it has been shown in a recent communication* to the Royal
Society that the bulk-modulus can be calculated from the thermal
capacity per unit volume by the formula—

ey= 2071 x 108 x O,%,

where e, is the bulk-modulus and C, the mean thermal capacity per
unit volume between 0° C. and 100° C. According to Regnault the
thermal capacity per unit mass is 0°2499, and according to Kopp it is
0:245.+ The mean of these two numbers is 0°2480, and the thermal
capacity per unit volume is therefore 0°2480 x 1:743, or 0°4323. From
the above formula, therefore, we obtain—

ey=2071 x 10° 0:4'323%
= 292-7 x 108,

This number does not differ from that obtained by observation by
so much as 2 per cent., and considering the difficulties which are in
the way of getting correct values of the bulk-modulus, we may regard
the agreement of the observed and calculated values of e, as suffi-
ciently satisfactory.

Arrangement of the Magnesium Wire for Observations on the Alteration
of Resistance produced by Longitudinal Traction.

Hepervment VILLI.

A pair of magnesium wires were arranged for an examination of the
effect of longitudinal traction on the electrical resistance of the metal
in the same manner as the nickel wire before mentioned, but, as it was
desirable to have the permanent load as light as possible in order to
avoid trespassing beyond the limits of elasticity, the scale-pan was
dispensed with and the weights were suspended to a small hookf by
string so that at the outset the permanent load on the wire only
amounted to 4 kilo. When a sufficient rest had been allowed to

* “ Proc, Roy. Soc.,” No. 232, 1884.

+ Clarke’s “ Constants of Nature,’ Smithsonian Miscellaneous Collection, No. 276,
p- 15.

t Loe. cit., p. 58, fig. 10.

Stress and Strain on the Properties of Matter. 519

enable the pair of wires to attain a constant resistance-ratio, various
amounts of temporary stress from 4 to 2 kilos. were employed. The
results are given below :—

Temporary alteration
food onthe | Temporary | visions of. the
wire in kilos.* Siete es platinum-iridium

Temporary
alteration of
resistance per

rs kilo.
4 4 4 4, 8°8
4 1 10°8 10°8
4 13 19°5 STs 0
4 2 | 31 °4. sCY/
2 = 4, °4, 6°8

The wire completely recovered itself when each of the temporary
loads was removed, and yet it will be noticed that the alteration of
- resistance per kilo.t varies largely with the load, so much so, indeed,
that with a temporary load of 2 kilos. the temporary alteration per
kilo., which is of the nature of increase on loading, was nearly double
that when only 4 kilo. was employed for the temporary load. This
marked increase of alteration of resistance per kilo. with the increase
of the temporary load does not depend upon the amount of permanent
stress, as we obtain the same alteration for 4 kilo. when the per-
manent load is $kilo.as we do when the permanent load is 2 kilos.,
but at the same time it should be observed that with the permanent
load of 2 kilos. the first effect both of loading and unloading with
4 kilo. was considerably greatert than that which took place after three
loadings and unloadings with the 4 kilo.§ The results given above
undoubtedly point to imperfect elasticity due to the rotation of the
molecules about their axes, for though the wire recovered its original
resistance on the removal of the load, this is evidently due to the
slight shock caused by unloading. ||

Hepervment LX.

In order to examine more fully the relationship which might exist
between the alteration of resistance and the alteration of length
caused by temporary traction, the wire used in determining the value —

* Weight of clamp, hook, &c., included.

+ The means of ten closely according trials with each load.
' { More than twice as great.

§ After this the effect remained constant.

|| With some metals a marvellously small agitation suffices to make the molecules
spring back to their original position after they have been permanently deflected
from their positions by mechanical or other stress.

520 Mr. H. Tomlinson. The Influence of

of “ Young’s modulus” by the method of static extension was teste
with nearly the same loads, both temporary and permanent, as in the
last experiment, with the following results :—

Temporary alteration Temporary
rmanent m : :
Berman | Zempermy Mot lengih in | alteration of
half-millimetyres. length per kilo.
z = 2°70 5°40
$ 1 5°49 5°49
= 13 8:29 5°53
oy 2 11°41 5°76
Js z 2°37 A 74
24 z 2°37 4-74
1 z 2°54 5°08

The numbers given in the third column are the means of several
trials and, with the exception of the last two, require a slight correc-
tion, Inasmuch es it was evidently impossible with such a small per-
manent load as } kilo. to obtain a sufficiently straight wire.* The

correction, hnwever can be easily applied, for we see that when the

permanent load is equal to 1$ kilos. a temporary load of 3 kilo.
produces precisely the same temporary elongation as when the per-
manent load is 24 kilos., or, in other words, 14 kilos. must have
sufficed to make the wire straight. Thus with a permanent load
of 4 kilo. the apparent increase of length caused by the mere
straightening of the wire is 2°70—2°37, or 0°43 when 4 kilo. is the
temporary load, and will be 0°43+2°53 —2°37, or 0°59 when the tem-
porary load is either 1 kilo. or greater than ] kilo. Making the above
corrections, and placing side by side the alteration of length and the
alteration of resistance produced by each additional 3 kilo., we obtain
as follows :—

Nave Temporary alteration | Temporary alteration
of} kilos, | Cf resistance for each of length for each
2 ; successive 3 kilo. successive + kilo.
it 4° 4, 2°37
2 6° 4 2°63
3 Bie 2°80
4. 11°9 3°12

We may notice that though, in consequence of imperfect elasticity,

* A matter of no importance in the electrical experiments.

+ The recovery of length was as complete as the recovery of resistance had been
on the removal of the stress, and this is no doubt due to the cause previously
mentioned.

Stress and Strain on the Properties of Matter. 521

the temporary alteration of length increases in greater proportion than
the load, this increase of effect is very much less than is the case
when the alteration of resistance is concerned, the difference between
the first and last numbers of the third column being only 31 per cent.
as compared with the 170 per cent. difference between the first and
last numbers of the second column. ;

It has been proved that longitudinal traction on the whole causes
increase of resistance, but this increase is less than can be accounted
for by mere change of dimensions, provided that the temporary stress
used be sufficiently small. In the present instance it may be assumed
that for any temporary stress not exceeding 4 kilo. we shall barely
enter into the region where ‘“‘ Hooke’s law” no longer holds good,*
and that up this limit of loading the increase of resistance and of
length will, within the limits of errors of observation, be proportional
to the load, since, were it otherwise, there could not be the accordance
which there is between the value of ‘“‘ Young’s modulus” as deter-
mined by the statical and dynamical methods.t If, then, we take
4-4 divisions of the platinun-iridium wire to represent the temporary
increase of resistance produced by a load of $ kilo., we gather that
the increase of resistance due to a stress of 1 gram per square centi-
metre is 1841 x107~¥ per unit. In calculating the alteration of
resistance per unit, resulting from increase of length, we must take
the value of “ Young’s modulus” obtained by using the statical ©
method, for the alteration of resistance is necessarily determined by
this method. If we do so we find that the ratio of the increase of
resistance per unit to the increase of length per unit is 0°7813. The
mere change of dimensions, however, would cause an increase of
resistance of 1+25, where 0 is the ratio of lateral contraction to
longitudinal extension, and may be taken as equal to 0°2501; so that
on the whole we have a decrease of the specific resistance per unit,
equal to 1:5002—0°7818, or 0°7189. With aluminium also it has been
shown{ that there is a decrease of specific resistance per unit; but
this is of small amount, namely, 0°420 for the unannealed, and 0262
for the annealed metal. We may say, then, that though magnesium
does not agree with nickel and cobalt in having its resistance
decreased—in spite of change of dimensions—it does agree with
these metals and with aluminium in having its specific resistance
decreased by longitudinal traction of small amount.

The question next arises, shall we, passing the limit of temporary
stress up to which “ Hooke’s law” holds good, eventually find the
decrease of specific resistance changed into increase when the tem-

* See loc. cit., pp. 12, 13.

+ The temporary elongation produced by 3 kilo., namely, 2°37 half-millimetres,
was employed in calculating the former of the two values.

ft Loc. cit., p. 52.

VOL. XXXIX. 2M

p22 Mr. i. Tomlinson. The Influence of |

porary stress is comparatively large? The answer must be in the
affirmative, for, as we have seen, the alteration of resistance increases
with the load much more largely than the alteration of length: this
is shown 1 in the next table.

Table I.
. Alteration of specific
Tae of Increase of resistance resistance per unit
pete ae per unit divided divided by the increase
load - ioe by the increase of of length per unit.
ci length per unit. + signifies increase of
specific resistance.
O—s 0°7813 —0°719
3—1 15028 yy —0°472
1—13 307 —0-193
13—2 1°605 +0°105

It would appear, then, at first sight, that magnesium and nickel
behave in a somewhat similar manner as regards the effect of stress
on their specific electrical resistance, for with nickel the decrease of
resistance is changed to increase when the stress has passed a certain
limit. Closer examination, however, does not justify this view, for
with nickel the change from decrease to increase is conditioned by the
amount of the permanent load, so that if say 6 kilos. be the limiting
stress, and we maintain this stress permanently, an additional kilo.
will always produce increase of resistance, though this load of 1 kilo.
be taken off and put on any number of times, whilst with magnesium,
if we regard 2 kilos. as the limiting stress, and allow this load to
remain on, an additional } kilo. will only produce a temporary
imcerease or a temporary decrease of specific resistance when put on and
taken off respectively for the first time.

The Alteration of the Electrical Resistance of Platinum-iridium pro-
duced by Longitudinal Traction.

Platinum-iridium plays such an important part in the construc-
tion of standards of length and of electrical resistance, that having a
length of wire made of the alloy sufficient for my purpose, I resolved
to test its elasticity, and the change of electrical resistance due to
stress.

Preliminary Determination of the Value of “ Young’s pane ee
Rigidity, Density, §c.

The alloy was specially prepared for me by Messrs. Johnson and

Stress and Strain on the Properties of Matter. 526

Matthey, and an analysis made by them of a similar specimen, not,
however, drawn into wire, yielded the results given below.* —

Proportion.
Platinum-iridium at 10 per cent.. 99 °33
AIC TM OXCESS sc acl ect seis ees 0°23
Jeslaoxe uaaly, Peruri hee ace weet cman eR 0°18
Rei eranany. 3 = etal rs a eases ate 0°10
UOTE Wet Waneys erate er ook a wake e erare wee 3 0°06
99°90

The density at 0° C., calculated from this analysis, was 21510, and

according to MM. Deville and Mascart the coefficient of thermal
expansion between 0° C. and 16° C. is 0:00002541.
_ As it was not considered advisable to bend the wire so as to form it
into a coil suitable for finding the density in the ordinary way, the
latter was calculated from the mass, length, and diameter. The length
of the wire was 61°90 cm., the mass 22°088 grams, and the diameter,
as measured by the gauge at seven equidistant places, was as fol-
lows :—

Number of Diameter in centi-
place. metres.

——S==

YOHMAT PB wbde
Ss
es
a
Or
TS

From these data was deduced a density at 16° C. of 21°523, which
value, considering the drawing to which the metal had been subjected,
agrees very well with that calculated from the above analysis.

The value of ‘‘ Young’s modulus” was first determined by the
static method in my usual way, and proved to be 2089 x 10° grams
per square centimetre, and though the iength of the wire operated
upon was inconveniently small, the different trials agree very well
with each other. The modulus was next determined by the method of
longitudinal vibrations, the wire, which was sufficiently stout and rigid

* “ Nature,” August 7, 1879, p. 348.
2M 2

524 Mr. H. Tomlinson. The Influence of

for the purpose, being held by the finger and thumb in the centre, and
rubbed with a resined glove. When rubbed, the wire yielded some-
times one note, and sometimes another about a semitone lower in
pitch. Both these notes were fairly clear, and from the higher of the
two a value for the modulus was deduced of 2276 x 106 grams per
square centimetre, whilst from the lower was obtained a value which
within the limits of error of observation was exactly equal to that
got by the static method; so that we may regard 2089 x 108 grams
per square centimetre as representing with fair accuracy* the value of
‘““Young’s modulus.”

There was no difficulty in finding the value of the simple rigidity in
the usual way, and this proved to be 7248x106 grams per square
centimetre. From the above data the ratio of lateral contraction
to longitudinal extension was calculated to be 0°441. The values of
“Young’s modulus” and of the simple rigidity are both high, and it
is very remarkable that the 10 per cent. of iridium added to the
platinum should have raised the former value more than 40 per
cent.

Arrangement of the Platinum-iridium Wire for Observations on the
Alteration of Resistance produced by Longitudinal Traction.

Hxpervment X.

We will now turn to the experiments on the alteration of resistance
produced by longitudinal traction experiments, which it will be seen
resulted in a complete surprise in more ways than one. In the first
trials the wire was arranged in exactly the same manner as the steel
and magnesium wires had been, and the lever used for applying the
stress, but a German-silver wire was employed as the comparison-
wire. With only a permanent stress, due to the weight of the lever,
2 kilos. put on or taken off the lever caused an alteration of resist-
ance which required to be balanced by moving the sliding-piece
54°5 divisions, and when there was a permanent stress equivalent in
all to 3 kilos. on the end of the lever, an additional kilo. on or off
caused an alteration represented by 27:0 divisions, or almost exactly
half the number of divisions which were required with twice the
temporary load. Hence it was calculated that a stress of 1 gram per
square centimetre produced an increase of resistance per unit of
3049 x 10-1”. The increase of resistance per unit divided by increase
of Jength per unit was 6°368, and the increase of specific resistance
per unit was 4°486. These results were very unexpected, inasmuch as
all the other alloys which have been examined, namely, brass, German-
silver, and platinum-silver are altered by stress in their electrical
resistance far less than the pure metals of which they are composed,

* This value would seem to be correct within at least 2 per cent.

Stress and Strain on the Properties of Matter. 525

whereas here the increase of specific resistance produced by traction
is nearly three times as great as with iron, which heads the list of
those metals which show increase of resistance on loading.

Experiment XI.

Under the above-mentioned circumstances, it was deemed to he
advisable to test the platinum-iridium in another manner. In this
case, instead of using German-silver as the comparison-wire, the
following arrangement was made :—

To the centre of the wire was firmly fixed a brass clamp, which
rested on a stout table, and was connected with one terminal of the
galvanometer, the other terminal being as usual connected with the
sliding-piece. The lower half of the wire, which passed through a
small hole in the table, was stretched by means of the lever, whilst
the upper half remained unstretched. Near the extremities of both
halves were fixed other clamps, provided with terminal screws, which
in each case were united as usual with one pole of a battery, and with
a set of resistance coils joined to each other by the platinum-iridium
wire traversed by the sliding-piece. With this arrangement it will be
seen that the upper half of the wire served as a comparison-wire to
the lower half. The results of this experiment were in fair accord-
ance with those of the previous one, and still showed platinum-
iridism to be considerably more increased in resistance by traction
than any of the other metals.

Hupervment XII.

In order to remove any further doubt about clamping not being
sufficient to make proper connexion between the various parts of the
“bridge,” a third experiment was tried, in which the platinum-
‘iridium wire, with a German-silver wire as a comparison-wire, were
arranged as in Hixperiment X, but now all connexions with the wire
to be stretched were well soldered, and a long series of trials, extend-
ing over three days, was made with a view to not only confirm the
results of Experiments X and XI, but also to bring out any fresh
peculiarities which might exist. The main points to which it is well
to call attention are shown in the last two series of trials given below,
in which the permanent stress was that due to the weight of the
lever itself.

It is noteworthy here that the resistance at first increases in greater
proportion than the load, but when a certain limit of stress has been
reached the ratio of the increase of resistance to the load producing it
begins to diminish, until finally the last kilogram only produces the
same alteration of resistance as the first. A similar state of things
was perceived with wires made of other metals in the experiments

526 Mr. i. Tomlimson. The Influence of —

Temporary alteration of

resistance in terms of the oe wee ee
Kilos. on | — divisions of the graduated = oe nis era ae
the lever. platinum-iridium wire. aoe a Cea Sue Ee
First series. econd series. | two series.
2nd ” 2a 5 IAD 24°00
3rd 9 29°5 99-5 29-50
4th ” 32°0 83°5 32°75
6th ,, 27:0 28:0 27°50
7th ,, 23 °0 26°5 24-75
8th ” oe 23°5 23°50

described in the previous portions of this memoir,* and, moreover,
there is a like change in the elasticity,t but with platinum-iridium
the effect, as far as alteration of the resistance is concerned, is more
marked than is the case with other metals. Hqually noteworthy is it
that at the third kilogram there is a sudden increase in the tem-
porary alteration of resistance produced by the load, and a like
phenomenon is plainly discernible in the above-mentioned previous
experiments. Moreover, the stress which produces this sudden
increase is certainly not far from the stress which produces the first
sudden leap in the value of the ratio of the permanent alteration of
resistance to the load, when the annealed wire is stretched for the
first time ;{ nay, more, a careful examination of Experiment VII§
shows undoubted evidence of the existence of the same number of
critical points where temporary alteration is concerned, as there are
in the case of permanent extension.

Finally, it must be added, that if we take the mean effect produced
by all the loads on the resistance of the wire, we obtain an increase of
resistance which is exactly equal to that already recorded in Experi-
ment X, and therefore we must regard the comparatively large
increase of resistance of platinum-iridium caused by traction as a
well-established fact. ||

* Loc. cit., p. 50, where by taking the alteration of resistance caused by con-
secutive loads of 2 kilos. each, this can be plainly discerned.

+ Loe. cit., p. 16.

~ Compare Experiments VII and XXIII, loc. cit., pp. 50, 82. As regards
Experiment XXIII, it should be remarked that more recent observations have shown
that there is a critical point at the third kilogram (fifth kilogram if we include the
weight of the scale-pan itself), and that here therefore we must look for the first
critical point and not at the eighth kilogram (tenth kilogram including the weight
of the scale-pan), where is the second critical point.

§ Loe. cit., p. 50.

|| This comparatively large increase of resistance produced by traction is rather
against the use of platinum-iridium in the construction of standard resistance coils.

Stress and Strain on the Properties of Matter. O24

The Effect of Longitudinal Traction on the Thermo-electric Properties
of Platinum-iridium.
Haperiment XIII.

The above-mentioned large increase of resistance resulting from
the temporary traction of platinum-iridium, together with the ap-
parent relationship between the effect of mechanical stress on the
thermo-electric properties of metals, and that on the specific resist-
ance, rendered it probable that stress would act on the thermo-electric
properties of iron and platinum-iridium similarly as regards nature,
but with greater intensity with the latter metal than with the former,
but here, again, a surprise was met with, for when the wire was
tested in the same manner as the cobalt had been, the unstretched
platinum-iridium was found to be positive to the temporarily stretched
metal, and therefore the alloy is affected by stress, thermo-electrically,
in a manner similar to nickel. Thus we see that, though these new
experiments would in the case of cobalt and magnesium largely con-
firm us in our opinion respecting the above-mentioned relationship, it
is quite the contrary in the case of platinum-iridium. In the next
table will be found drawn up the results obtained by Hall, Bidwell,
and myself.

Hall says of the numbers in the second column: ‘‘I cannot vouch
for the quantities within 50 per cent., but I think I can vouch for the
direction of the effect.” Bearing this statement in mind, and the diffi-
culties which lie in the way of obtaining accurate values for the ratio
of lateral contraction to longitudinal extension, which difficulties will
affect the numbers in the fourth and fifth columns, one cannot help
being struck with the fact that with most of the metals the order of
the ‘‘ rotational coefficients” is the same as that of the alteration of
_ specific resistance caused by traction. Cobalt and platinum are,
however, conspicuous exceptions, but with regard to the former
metal it has been already observed, and of course the same observa-
tion would apply equally to nickel and iron, that longitudinal traction
might produce different effects in the magnetised and unmagnetised
metals. The exception furnished by platinum cannot be thus ac-
counted for, nor does it seem fair to attribute the discrepancy either
to errors of observation or to difference in the purity of the specimens
examined by Hall and myself respectively.* In the fifth column is
given the difference between the alteration of the specific resistance
of lead by traction, and that of the other metals, and, with the excep-
tions just mentioned, it may be fairly said that, within the errors of

* The specimen of platinum used by myself was obtained from Messrs. Johnson
and Matthey as chemically pure.

+ I ought to remark here that according to Bidwell the “ Hall effect” in
aluminum is +. In a trial made by myself on the pure specimens of aluminium in

528 Mr. H. Tomlinson. The Influence of

Table II.

“ Rota- Direction 8 oa ee
bil of thermo- Dee eters Ditto.
Metal. tional co- |. pleat per unit divided by | 4 613
efficient.” * arent increase of length
i ‘ per unit.

Tron + 78°0 + + 2°618 + 1°005
Steel oe ar + 2°082 + 0°469
Goballt 4. c2rssseaen + 25:0 _ —2°203 — 3°816
Zine . + 15°0 + +2°113 + 0:500
Cad oes sae ee 0) 0) +1°613 0
Tin a — o2 — +1:630 + 0°017
IBV ASS i. iat a Maline — 1°3 - + 0°166 — 1°447
LEME ii oly as Vaal Aer Ber — 2°4 _ +2°239 + 1°626
Gold. — 6°8 —
BER faite atten aria 00 — 86 — +1°617 + 0°004
Copper) srers,.~ a0 |) = LOO - +1:°005 — 0°382
Aluminum.......| — 50°0 + —0°420 — 2°033
Magnesium...... — 50°0 _ —0°'733 — 2°346
Nickel ..........] —120°0 — — 8-860 ~-10 °473
German-silver ... — - +0°226 — 1°387
Platinum-silver... — - +0 624 | — 0°989

Platinum-iridium. — — + 4° 486 + 2°873

observation to which the numbers in this column are lable to be
affected, the signs are here the same as those in the second column.

As regards the relationship between the alteration of specific
resistance by traction and that of the thermo-electric qualities of the
metals due to the same cause, it may be seen by comparing the third
and fifth columns, that out of sixteen different métals, pure and alloyed,
the signs in the two columns are decidedly the same in eleven instances,
are decidedly different in three instances, and are dubiously so in two
instances.

It has been noticed§ that if the density of a substance be denoted
by A, and A represent the atomic mass, so that the difference between

the centres of adjacent molecules be proportional to (=) =a, say,

my possession, the effect of traction on the thermo-electric properties of the metal
seemed to be the same in direction as that given, and for which Bidwell is my
authority, but the effect was very slight, and I am not now quite certain whether a
less stress than was then applied would not give an opposite result.

* A + sign in this column signifies that the effect is in a direction the same as
that which the conductor itself bearing the current would follow if free to move
across the lines of magnetic force (see ‘‘ Nature,” Nov. 10, 1881, p. 46).

+ A + sign in this column signifies that the direction of the thermo-electric
current is from unstretched to stretched through the hot junction.

{ A + sign in this column signifies increase of resistance.

§ Loe. cit., p. 32.

Stress and Strain on the Properties of Matter. 529

eXa! is, with most metals, a constant, where e denotes “ Young’s
modulus.” Taking the mean of the values of e and of A for cobalt in
the annealed and unannealed conditions, we have #=1'927, and
eX a@!=1886x108. For magnesium 2=2'399, and e x a7=1969 x 10°.

In the next table will be found collected together most of those
results of the present inquiry which can be expressed by numbers.

It has been suggested with regard to the method of finding the
effect of strain on the resistance, that unless the strain was fairly
uniform, thermo-electric effect might have to some extent vitiated the
results. It will be seen, however, that the strain must have been
fairly uniform, and even if there had been considerably more lack
of uniformity than actually existed, the small change which can be
wrought by stress and strain in the thermo-electric power of any of
the metals hitherto used, would preclude the possibility of any appre-
ciable vitiation. Further, in many cases, very different lengths of the
same wire were tested and found to yield the same results, which
would not have been the case had the strain on the connexions, a
point also suggested for consideration, introduced error.

Summary.

1. The electrical resistance of cobalt, like that of nickel, is tem-
porarily decreased by temporary longitudinal traction. Whether
the decrease of resistance would be changed to increase, as it is with
nickel, by a greater amount of stress, has not yet been ascertained,
but should this be the case, the magnitude of the stress per unit area
which would suffice for the purpose, must be much greater with cobalt
than with nickel.

2. Permanent extension and rolling diminishes with cobalt as with
nickel, the effect of longitudinal traction alluded to in 1.

3. Cobalt is remarkable for the extreme persistence with which the
same load, when applied again and again, continues to produce per-
manent increase of resistance.

4, Moderate permanent extension decreases permanently with cobalt
as with nickel and iron, the specific resistance.

5. Temporary longitudinal traction renders cobalt temporarily
positive as regards its thermo-electrical qualities to cobalt not under
traction, provided there is no magnetic stress acting at the same
time.

6. Temporary longitudinal magnetic stress renders cobalt tem-
porarily negative as regards its thermo-electrical qualities to cobalt
not under magnetic stress, provided there is no mechanical stress
acting at the same time.

7. The effect of temporary longitudinal traction, even when carried
to very great excess, is to increase the resistance of unannealed piano-
steel; and this increase, though less than with iron, both for unit

Mr. H. Tomlinson. The Influence of

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Stress and Strain on the Properties of Matter. 531

stress per square unit of area and per unit temporary increase of
length, is much greater than can be accounted for by changes in the
dimensions of the steel.

8. The electrical resistance of magnesium is temporarily increased
by temporary longitudinal traction of moderate amount, but the
amount of increase is less than can be accounted for by mere change
of dimensions, so that the specific resistance of magnesium, like that
of aluminium, is diminished by the temporary stress.

9. When the permanent load on the wire is very small, the temporary
increase of length, like that of the increase of resistance, increases in
larger proportion than the temporary load, but the former increases
less rapidly than the latter, so that when the temporary stress exceeds
a certain limit the above-mentioned decrease of specific resistance is
changed to an increase of specific resistance.

10. The values of ‘‘ Young’s modulus,” and the simple rigidity of
the alloy, platinum-iridium, are much greater than those calculated
from the same values for the components of the alloy.

11. The electrical resistance of platinum-iridium, quite unlike that
of platinum-silver, German-silver, and brass, is much more increased
by temporary longitudinal traction than that of either of the com-
ponents of the alloy.

12. The increase of resistance mentioned above is much greater
than can be accounted for by change of dimensions, so- that the
increase of specific resistance produced by longitudinal traction is
considerably greater than is the case with any of those other metals
examined whose resistance is increased by longitudinal traction.

13. The alteration of the resistance alluded to in 11 at first increases
in greater proportion than the load, but when a certain limit of stress
has been reached, the ratio of the temporary increase of resistance to
the load producing it, begins to diminish, and finally reaches the same
value as at first. A tendency to a similar state of things is seen with
other metals, but in none is the phenomenon so pronounced as in
platinum-iridium.

14. Unstretched platinum-iridium is thermo-electrically positive to
the temporarily stretched metal.

15. The present investigations, as far as magnesium is concerned,
confirm the previous ones in showing an apparent relationship between
the “‘ Hall effect” and the alteration of the specific resistance pro-
duced by mechanical stress. With regard to cobalt this is not so, at
any rate for the metal when not under the influence of magnetic
stress.

INDEX to

AIRY (G. B.), results deduced from the
measures of terrestrial magnetic force
in the horizontal plane at the Royal
Observatory, Greenwich, from 1841 to
1876, 255.

Ammonium carbamate, on the limited
hydration of (Fenton), 386.

Anderson (John) admitted, 362.

Anniversary meeting, 277.

Atkinson (A. 8.) on the tctal solar
eclipse of September 9, 1885, 211.

Auditors elected, 208.

report of, 277.

Baeyer (Adolf) elected, 362.

Baird (A. W.) and G. H. Darwin, re-
sults of the harmonic analysis of tidal
observations, 135.

Bakerian lecture (Huggins), 108.

Balance sheet, 302—305.

Basalts (tertiary) of the north-east
Atlantic, second report on the evi-
dence of fossil plants regarding the
age of the (Gardner), 412.

Bee (honey), on the geometrical con-
struction of the cell of the (Hennessy),
253.

Blyth (A. W.), study of disinfectants
by new methods, 259.

Bodily labour, influence of, upon the
discharge of nitrogen (North), 443.

Cerebral physiology, experimental re-
searches in. II.—On the muscular
contractions which are evoked by
excitation of the motor tract (Horsley
and Schafer), 404.

Chlorophyll, contributions to the
chemistry of (Schunck), 348.

Cobra (Indian), venom of the (Wolfen-
den), 436.

Council, election of, 301.

Darwin (G. H.) and A. W. Baira,
results of the harmonic analysis of
tidal observations, 135.

Davidson (Thomas), obituary notice,
viii.

Declination, preliminary results of a
comparison of certain simultaneous

VOL. XXXIX.

fluctuations of the, at Kew and at
Stonyhurst during 1883 and 1884,
(Perry and Stewart), 362.

Disinfectants, studies of, by new methods
(A. Wynter Blyth), 259.

Donation fund, account of grants from
the, 313.

Drosera dichotoma, on the phenomena
accompanying stimulation of the
gland cells in the tentacles of (Gar-
diner), 229. 3

Eclipse of September 9, 1885, on the
total solar (Atkinson), 211.
on the total solar (Hector),

208.

Hlection of Auditors, 208.

Council, 301.

foreign members, 362.

officers, 301.

Electrical conductivity (Tomlinson), 503.

Elgin, on the relation of the reptiliferous
sandstone of, to the upper old red
sandstone (Judd), 394.

Evaporation and dissociation, on (Ram-
say and Young), 228.

Fellows deceased, list of, 277.

elected, list of, 278.

Fenton (H. J. H.) on the limited
hydration of ammonium carbamate,
386.

Financial statement, 302—305.

Foreign members elected, 362.

Frog, on variations in the amount and
distribution of fat in the liver-cells of
the (Langley), 234.

Gardiner (W.) on the phenomena
accompanying stimulation of the
gland-cells in the tentacles of Drosera
dichotoma, 229.

Gardner (J. S.), second report on the
evidence of fossil plants regarding
the age of the tertiary basalts of the
north-east Atlantic, 412.

Gemmell (J. W.) on the magnetisa-
tion of steel, cast iron, and soft iron,
374.

Glass (devitrified), on the microscopic

534

characters of some specimens of, with
notes on certain analogous structures
in rocks (Herman and Rutley), 87.

Glucinum (beryllium), on the atomic
weight of (Humpidge), 1.

Government Grant of £4,000, account
of the appropriation of the, 310.

Grants from the Donation Fund, account
of, 313.

Harmonic analysis of tidal observations,
results of the (Baird and Darwin),
135.

Hector (J.) on the total solar eclipse
of September 9, 1885, 208.

Henle (F. G. J.), obituary notice, iii.

Hennessy (H.) on the geometrical con-
struction of the cell of the honey bee,
253.

Herman (D.) and F. Rutley, on the —

microscopic characters of some speci-

mens of devitrified glass, with notes ©

on certain analogous structures in
rocks, 87.

Horsley (V. A.) and HE. A. Schafer,
experimental researches in cerebral
physiology. JJ.—On the muscular
contractions which are evoked by exci-
tation of the motor tract, 404.

Huggins (William) on the corona of
the sun (Bakerian lecture), 108.

Humpidge (T. 8.) on the atomic weight
of glucinum (beryllium), 1.

Integrals, on certain definite, Nos. 13, 14
(Russell), 20, 22.

Jenkin (Henry Charles Fleeming), obi-
tuary notice, 1.

Judd (J..W.), on the relation of the
reptiliferous sandstone of Elgin to
the upper old red sandstone, 394. .

report on a series of specimens

of the deposits of the Nile delta,

213.

Kew Committee, report of the, 314.
Observatory, history of (Scott),

37.
Klein (Felix) elected, 362.
Kowalewski (A.) elected, 362.

Lamb (Horace) admitted, 409.

Lamprey, on the formation of the meso-
blast and the persistence of the blasto-
pore in the (Shipley), 244.

Langley (J. N.) on variations in the
amount and distribution of fat in the
liver-cells of the frog, 234.

Lockyer (J. N.), a new form of spectro-
scope, 416.

INDEX.

Lovén (Sven) elected, 362.

MacMunn (C. A.), researches on myo-
hematin and the histohzmatins, 248.

Magnetisation (on the) of steel, cast
iron, and soft iron (Gemmell), 374.

McConnel (J.), an experimental inves-
tigation into the form of the wave
surface of quartz, 4.09.

Medals, presentation of the, 299.

Myohematin and the histohzmatins, re-
searches on (MacMunn), 248.

Naja tripudians (Indian cobra), a pre-

liminary account of a research into the
nature of the venom of the (Wolfen-
den), 436.

Newall (H. F.) and J. J. Thomson, on
the formation of vortex rings by
drops falling into liquids and some
allied phenomena, 417.

Nile delta, report on a series of speci-
mens of the depesits of the (Judd),
213.

Nitrogen, influence of bodily labour
upon the discharge of (North), 443.
North (W.), the influence of bodily
labour upon the discharge of nitrogen, -

443, |

Obituary notices of fellows deceased :—
Davidson, Thomas, viii.
Henle, F. G. J., iii.
Jenkin, Henry Charles Fleeming, i.
O’Sullivan (C.), admitted, 208.

Peripatus (South African), on the fer-
tilised ovum and formation of the
layers of the (Sedgwick), 239.

Perry (Rev. S. J.) and B. Stewart, pre-
liminary results of a comparison
of certain simultaneous fluctuations
of the declination at Kew and at
Stonyhurst during the years 1883 and
1884, as recorded by the magneto-
graphs at these observatories, 362.

Presents, lists of, 339, 436.

President’s address, 278.

Quartz, an experimental investigation
into the form of the wave surface of
(McConnel), 409.

Ramsay (W.) and 8. Young, on evapo-
ration and dissociation, 228.

Rocks, on the microscopic characters of
some specimens of devitrified glass,
with notes on certain analogous struc-
tures in (Herman and Rutley), 87.

Russell (W. H. L.) on certain definite
integrals (Nos. 18, 14), 20, 22.

INDEX,

Rutley (Frank) and D. Herman, on the
microscopic characters of some speci-
mens of devitrified glass, with notes
on certain analogous structures in
rocks, 87.

Schafer (H. A.) and V. A. Horsley, ex-
perimental researches in. cerebral
physiology. II—On the muscular
contractions which are evoked by exci-
tation of the motor tract, 404.

Schunck (E.), contributions to the che-
mistry of chlorophyll, 348.

Scott (R. H.), history of the Kew
Observatory, 37.

Sedgwick (A.) on the fertilised ovum
and formation of the layers of the
South African peripatus, 239.

Shipley (A. E.) on the formation of
the mesoblast, and the persistence of
the blastopore in the lamprey, 244.

Spectroscope, a new form of (Lockyer),
416.

Stewart (B.) and Rey. S. J. Perry, pre-
liminary results of a comparison of

certain simultaneous fluctuations of |

the declination at Kew and at Stony-
hurst during 1883 and 1884, 362.

Stress and strain, the influence of, on
the physical properties of matter
(Tomlinson). Part II. Electrical con-
ductivity (continued), 503,

Sun, on the corona of the (Huggins),
108.

Table showing number of Fellows, 301.

Terrestrial magnetic force in the hori-
zontal plane, results deduced from the
measures of, at the Royal Observatory,
Greenwich, 1841-1876 (Airy), 258.

535

Thin (G.), additions to a former paper
on Trichophyton tonsurans, 415.

Thomson (J. J.), the vortex ring theory
of gases. On the law of the distribu-
tion of energy among the molecules,
23.

Thomson (J. J.) and H. F. Newall, on
the formation of vortex rings by drops
falling into liquids and some allied
phenomena, 417.

Tidal observations, results of the har-
monic analysis of (Baird and Darwin),
135.

Tomlinson (H.), influence of stress
and strain on the physical properties
of matter. Part II. Electrical con-.
ductivity (continued). The alteration
of the electrical conductivity of cobalt,
magnesium, steel, and platinum-
iridium by longitudinal traction, 503.

Trichophyton tonsurans, addition to a
former paper on (Thin), 415.

Trust funds, 306-309.

Vice-Presidents appointed, 14.

Vines (S. H.) admitted, 208.

Vortex ring (the), theory of gases. On
the law of the distribution of energy
among the molecules (Thomson), 23.

| Vortex rings, on the formation of, by

drops falling into liquids, and some
allied phenomena (Thomson and
Newali), 417.

Wolfenden (R. N.), a preliminary
account of a research into the nature
of the venom of the Indian cobra
(Naja tripudians), 436.

Young (S.) and W. Ramsay, on evapo-
ration and dissociation, 228.

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5 Ss) | CONTENTS (continued),

CES =

December 17, 1885. aa ae ee os
| PAGE:
I. An Experimental ees into the Form of the Wave Surface of _
3 Quartz. By James McConnett, B.A. eer eater ey

II. Second Report on the Evidence of Fossil Plants senanding the Nae of the —
i Tertiary Basalts of the North-East Atlantic. By J. STARrxiz
pO DINER 6 ee, Ss we Na a ea

ITT. Addition to a former Paper on Trichophyton tonsurans (“ eee Hey, Soe.,’ ee
vol. 33, p. 234). By: GrorGE Tun, M.D. 2 de : - 415 -

IV. A New Form of Spectroscope. By J. Norman Lockyer, EBS. . 416

V. On the Formation of Vortex Rings by Drops falling into Liquids, and
some allied Phenomena. By J. J. THomson, M.A., F.R.S., Fellow of
Trinity College, Cavendish Professor of Experimental Physics, Cam-—
bridge, and H. F. Newaut, M.A., Trinity College, Cambridge . Ade

VI. A Preliminary Account of a Research into the Nature of the Venom of
the Indian Cobra (Naja tripudians). By R. Norris WoLFEnpDeEn,
M.D, Cantab. (from the ies oe ae gee
London) : : : : 436

List of Presents : soos ; j : : Bees 2 : . 436

The Influence of Bodily Labour upon the ‘Discharge -of inoen Dae ae
Banks Nortu, B.A., F.C.S. (Plates 5—10) 2. 7 —. ; . 443

The Influence of Stress and Strain on the Physical Properties of Matter.
Part II. Electrical Conductivity (continued). ‘The Alteration of the
Electrical Conductivity of Cobalt, Magnesium, Steel, and Platinum-
iridium by Longitudinal Traction. By Hersert Tomurinson, B.A. . 503

andes? =; : : : ; ; : s : : ane . 533
Title and Contents. |

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vil

strivings between rival destructive and preservative tendencies sup-
posed to be resident in the body itself, but in the existence in its
environment of elements injurious to its welfare.

At an earlier period, the absence of physical and chemical know-
ledge would have rendered the success of any such attempt impossible.
As it was it was imperfect and was recognised as such by its author;
but it was so unquestionably the beginning of that rapid development,
by which, under the influence of Virchow and his pupils, what we

now recognise as the science of pathology has come into existence,

that of this science Henle must be regarded as the founder.

In certain directions, indeed, Henle was in advance of his successors.
If, for example, we take the opening chapter of the ‘‘ Untersuchungen,”
which deals with the etiology of contagious diseases, we find in it a
most remarkable anticipation of the discoveries in this field of inquiry
of the last fifteen years. He sets forth in the clearest language that
the material of contagium must necessarily be not only organic but
living and organised, and that it must consist of “‘ parasitical beings
which are certainly among the lowliest, smallest, but at the same
time most productive which are known.”

The consideration of the reasoning which led Henle to this con-
clusion, affords a striking illustration of the way in which discoveries
made in other departments of natural science influence medicine.
Henle’s grounds were* (1) the evidence of experiments that contagion
acts in infinitesimal quantities, and must therefore be self-multiplying;
(2) the proof then shortly before given by Schwann that the analogous
processes of fermentation and putrefaction are dependent on minute
organisms: (5) the proof recently given by Bassett Audouin that the
muscardin of silkworms, a disease communicable through the air,
was due to a contagiwm vivum; and finally (4), the consideration that
the development of contagious diseases could be best explained by
attributing them to a living cause.

That Henle did not himself follow these indications may probably
be attributed to his being engrossed by other researches. It seems at
first sight difficult to account for the fact that the seed sown by him
did not fructify in the minds of some of his readers; for when in
1868 the investigations of Chauveau again brought the subject of
contagium vivum to the front, it was approached from an entirely
different point of view.

A sketch must be given, in conclusion, of the views which Henle
entertained and taught as to the psychological side of biology.
Mention has already been made of his having lectured at Heidelberg
on anthropology. These lectures were given to a mixed academical

* See his “Pathologische Untersuchungen,” Berlin, 1840, pp. 17—20, and

36—41. The publication of this work was preparatory to that of the “ Rationelle
Pathologie.”

Vill

audience in 1847-52, and published thirty years afterwards under
the title of “ Anthropologische Vortrige.” That they dealt with
subjects very far apart from what we now understand by anthro-
pology may be gathered from the titles—Faith and Materialism ;
Taste and Conscience; The Physiclogy of Emotion; The Will;
Teleology and Darwinism; Medical and Religious Dualism; &e.
Among the most interesting are the two last enumerated. Like
many other biologists of the former generation, Henle, while cordially
accepting the doctrine of descent, strenuously opposed the monistic
view, which in the minds of most persons is associated with it, and
which refuses to find anything in the phenomena of life which cannot
be accounted for as resulting from the play of the molecular forces of
the chemical elements which take part in them. He regarded the
organism, whether plant or animal, not as the inevitable product of
the conditions under which it originated and was developed, but as
having independent powers of its own, which the environment is
capable of modifying or even controlling, but not of originating. The
constancy as well as the variability of organic structure, he said, are
alike manifestations of the existence of an agent attached to matter,
but not material, and endowed with the function of “ presiding over
the metabolism of the body capable of reproducing the typical form,
and of endless partition without diminution of intensity,” in a way
which has no counterpart in the inorganic world. It is this infinity
of the faculty which the organism possesses of “‘ making the material
which composes it its own, and impressing upon it its stamp,” which
separates it from the recognised forces of inorganic nature. Hvery
kind of organism has its ‘“‘ réumliches” as well as its “ zeitliches
ziel,’’* which’ serves as the law of its existence, and the fulfilment of
which in no way interferes with its taking its legitimate part in the
order of nature. J. Bos:

* “Teleologie und Darwinismus,” p. 92.

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