Cee ae: = Sab met Rae *” NS ‘at 2 = >" . “ ‘ Saal oie so 8 : . | semaiitnhabgresnoreermalyttnonat tees ee teh 9 ate teeet e eRe NET AERP I Ne reRSFON Fett TES 5 nt OT RS a = ET A EIEN AE RR FAS eT eR apn Nm NE ee Se ee ee re pt er ert at te rte ne ap errr i rae Praga Re gn — pean nea ree penetra mad ae dprepnsipiced vig ne sakde Sate indatenTactanentnaset din parisien hysodsr reais Some cater wh nema tienen gpa ene ole acer areti ORE parry pg mero cuneate setae asi ga ait mene aprtaproaing ean meter ipa tn eh arent pone ape apse enone ere g SHA WEDNESDAY, 12TH JANUARY 1898. 16. The pene Feeding of Working Horses. By T, U. Watton, Biscy etal Cy wh. Cass *17. The aoe Tek: : How its Progress Southwards inight be Prevented, By J. P. DowLIne ... : 18. The Farmers’ Weights and Measures. "By “HENRY Lorp, Gail C a: 19. Forestry in N. S. Wales. By Ww. s. CaMpBert, PES 20. Farmers’ Institutes. By W. 8S. CAMPBELL, F. LS. 21. Note on Hmex Australis. By R. HELMS... Section H.—ENGINEERING AND ARCHITECTURE. Fripay, 7TH JANUARY, 1898. Address by A. B. Moncrierr, M. Inst. C.E., M. Am. Soe. C.E., &e., President of the Section SATURDAY, 8TH JANUARY, 1898. 1, Notes on the Principles adie in Constructing Unballasted Lines of Railwaysin N.S. Wales. By H. Deanu, M.A., M. Inst. C.E., Engineer-in-Chief, Railways Construction, N. 5. Wales . 2. The Commercial Conditions governing Railway Extension in Australia. By C. O. Burcx, M.Inst. C.E. 3. On the ieapid Erection of a Steel Viaduct to replace a Timber Structure on the N.S. Wales eyo By W. SHELLSHEAR, M. Inst. C.E. : as ee ee a0 PAGE, 967 977 979 983 CONTENTS. xi Monpay, 10TH JANUARY, 1898. PAGE. 4, Narrow Gauge Railways. By F. Back, A.I.C.E., F.S.S., General Manager, Tasmanian Government Railways __... 986 5. Notes on the Action of Certain Explosives. By F. Marcuant, Meinst.€:H. ... 988 6. Some Remarks on Details of Hospital Construction and Lay Management. By C. E. Owrn Smyru, Superintendent of Public Buildings, Adelaide ... sa awe ook ae 1.989 7. Architecture ‘and the Allied Arts in N.S. Wales. By J. B. BaRLow . 991 8. The Or namental Treatment of Iron and Steel i in Building Work. By JAMES NANGLE ... ° 88 3 5 OEE Turspay, llrH JANvuARy, 1898. 9. Notes on the Recent Fire at Melbourne. By Joun SuLMAN, F.R.I.B.A. 5 995 10. A Review of some of the Conditions of Building Construction and Requirements in ee can Past and Present. HED G. ALLAN MANSFIELD a - a8 sat : ss «» 1005 WEDNESDAY, 12TH JANUARY, 1898. 11. The Grotesque in Modern Developments of the Picturesque. By Howarp JosELAND Sy Bes wed a ae ... 1009 12. Coal-mining in N.S. Wales. By J. H. Ronaupson _... ae) LOU Section I.—SANITARY SCIENCE AND HYGIENE. SatTurDAY, STH JANUARY, 1898. Address by Hon. ALLAN erm M.L.C., een bp Dea y &e., President of the Section.. : ae oe cee LOM FrIpay, 7TH JANUARY, 1898. 1. On the History and Prevalence of Tepes in Australia. By ie AsHBuRTON THompson, M.D. . 1040 . Short Description of a New Method of Pr eparing ‘and Preservi ing re ienical and Pathological Tissues, with special reference to their Colour Preservation. By Sypnry Jamieson, M.B. (Edin.), M.R.C.S. (Eng.) es aM sss 20° 1052 3. Tuberculosis i the Public Health. “By GEORGE LANE Mo.titxs, M.A., M.D. 10&4 4. A Brief Sketch of the History of Small- “pox and Vaccination in New South Wales. By Frank Tipswe tt, M.B., Ch.M. (Syd.), D.P.H. (Camb.) te me a: Shs Shs aoe OSS Section J.—MENTAL SCIENCE AND EDUCATION. FRIDAY, 7TH JANUARY, 1898. Address by JoHN Surtrtry, B.Se., President of the Section .. ae LOGS *1. The Relation of Ethics to Political Economy. By As ee THos. Rosepy, M.A., LL.D., F.R.A.S. ... 1083 *2. The Ethical’ Klement in Education. By the Rev. Gxo. LITTLEMORE ... ae : See eres 560 Xi CONTENTS. SATURDAY, 8TH JANUARY,’ 1898. 3. English Theories of Individual Freedom. By the Rey. Jas. Hit, M.A. ae oar er nce oe *4, Idealism in Ethics and Religion. By the Rev. A. J. GRIFFITH, Monpay, 10rH January, 1898. 5. The Psychology of Attention. By Rev. N. J. Cocks, M.A. .. *6. The Place of Museums in as) Education. By Miss L. Macponabp, M.A... re oe af AN ae Permanent Place of Literature in Education. By the Rev. C. J. Prescott, M.A.. se nhc om *8. The Function of Classical Study - in Education. By) Ee ave [Ene Asters Wie AC metre S00 soe oa Bop 50t nao 500 TuESDAY, lltH JANUARY, 1898. 9. Fact and Idea. By C. J. BrenNAN, M.A. *10. Socialism in Education. By P. F. Row anp, B.A. 11. The Financial Aspects of Secondary Education. By P. ANSELL Ropin, M.A... ae *12, The State and Secondary Education. By W. ia “ATKINS, B.A *13. Scientific Methods as ‘seperd to Modern Education. By Miss K. A. BADHAM.. ; aoe 50 Sac eile WEDNESDAY, 127TH JANUARY, 1898. *14. Is there a Science of Education? By Mrs. W. L. Atkins, B.A 15. A New Educational Experiment : Special Schools in Genny and England. By Miss M. Honpee.. : Sat *16. Teaching versus Education. By Miss H. C. Newcomn | bas #17. The Rationale of Miraculous Cures in Modern Days. By Dr. S. T. Kwaces ... Sb ate *18. Evolution and Sociology. By Dr. T. F. Macponap . THURSDAY, 13TH JANUARY, 1898. *19. State Technical Education by a system of meng: ee Results. By Professor D. C. SELMAN ... *20. Friedrich Nietzsche. By C. J. BRENN AN, M.A.. Index to Authors Index to Subjects and Proceedings List of Members for the Sydney (1898) Session... List of Societies and Public Institutions to which the Report i is presented Donations to the Library of the Australasian Association since 1895 Précis of previous Volumes of Reports 1888-95.. : PAGE, 1083 1083 1084 1093 1093 1093 1093 1100 1101 1106 1107 1107 1107 1113 1113. 1113 1114 1114 1115 aly 1125 1139 1148 1157 OFFICERS AND COUNCIL xu Officers for the Sydney Session of the Association JANUARY, 1898. PATRON: His Excellency the Right Hon. Henry Ropert Branp, VIScoUNT HAMPDEN. PRESIDENT: Professor A, LiverstpGkE, M.A., LL.D., F.R.S. ViceE-PRESIDENTS: H. C. Russet, C.M.G., B.A., F-R.S:, F.R.A-S. Sir James Hector, K.C.M.G., M.D., F.R.S. Professor Ratpu TATE, F.G.S., F.L.S. The Hon. A. C. Grecory, C.M.G., M.L.C. PERMANENT Hon. SECRETARY: Professor A. LiversipGE, M.A., LL.D., F.R.S; GENERAL TREASURER: H. C. Russett, C.M.G., B.A., F.R.S., F.R.A.S. SECRETARIES FOR THE OTHER COLONIES: E. F. J. Love, M.A., F.R.A.S., The University, Melbourne. Captain F. W. Hurton, F.R.S., Christchurch, N.Z. ALEXANDER Mormon, F.L.S., The Museum, Hobart. Professor E. H. Rennie, M.A., D.Sc., Adelaide University. Professor W. H. Brace, M.A., The University, Adelaide. JoHN SutrR.ey, B.Se., District Inspector of Schools, Brisbane, Ex-Orricio MEMBERS OF THE COUNCIL: The Council consists of the following:—(1) present and former Presidents, Vice-Presidents, Treasurers, and Secretaries of the Association, and present and former Presidents, Vice-Presidents, and Secretaries of the Sections ; (2) Authors of Reports or of Papers published in extenso in the Annual Reports of the Associa« tion. TRUSTEES (PERMANENT): H. C. Russeiz, C.M.G., B.A., F.R.S., F.R.A.S. ik} LJ. Bummey, ©.M.-G.,.EOR:S., FOR.A:S: Professor A. LiversipcE, M.A., LL.D. F.R.S. AUDITORS: R. Tesce, F.I.A. R. A. DALLEN. X1V OFFICERS AND COUNCIL. PUBLICATION COMMITTEE, The President, the Hon. General Treasurer, and the Secretaries of the Sections. RECOMMENDATION COMMITTEE: The President, the Permanent Hon. Secretary, the past Presidents, and the past General Secretaries, COMMITTEE FOR BUILDINGS AND Rooms, EVENING LECTURES AND SOIREES: H. E. Barrr, M.A.; R. R. Garran, B.A.; F. B. Guturiz, F.C.S. ; G. H. Kyipss, F.R.AGS: 5 KE. EF. Prrewan, AJRS.M. 3) EEC: Russet, C.M.G., F.R.S.; J. A. ScHoFIELD, A.R.S.M., F.C.S. ; T. W. E. Davin, B.A., F.G.S.; W. A. HasweEtt, D.Sc., F.R.S. ; A. LiversipGr, LL.D., F.R.S. ; W. H. Warren, M. Inst. C.E. ; J. T. Witson, M.B., C.M. ExCURSIONS COMMITTEE: H. Deane, M.A., M. Inst. C.E. ; J. W. GrimsHaw, M. Inst. C.E. ; W. M. Hamtet, F.1.C., F.C.S. ; G. H. Knipss, F.R.A.S.; J. MAIDEN, F.G-S. >; H. C) Russerm, C:MiG., FRiS.s) LaeWeeke Davin, B.A., F.G.S.; W. A. Haswett, D.Se., F.R.S.; A. Liversipcz, LL.D., F.R.S. LocaL COMMITTEE: By Rule 11 the Local Committee consists of the Members of Council resident in New South Wales, viz. :— ANDERSON, H. C. L., M.A. ANDERSON, Professor F., M.A. BAAN, dle Ri beAGee hime BELLEMEY, R. T., M.P.S. Coox, W. E., M.E. Crumme_r, H. S. W. Davin, Professor, B.A., F.G.S. Deanet, H., M.A., M. Inst. C.E. Der Lissa, A. Dixon, W. A., F.C.S. Ea, Rev. S. FARRER, W., M.A. FLETCHER, J. J., M.A., B.Sc. FRASER, J., B.A., LL.D. GaRRAN, Hon. A., LL.D., M.A. . GARRAN, R. R., B.A. GRIMSHAW, J. W., M. Inst. C.E. GUTHRIE, F. B., F.C.S. Hamner, W. M:, FC, EsC:S. Haswe tt, Prof., D.Sc., F.B.S. Kent, H. C., M.A. Kine, Hon. P. G., M.L.C. Knipps, G. H., F.R.A.S. Knox, E. W., J.P. LiversipGr, A., LL.D., F.R.S. MacLavrtn, H. N., M.D., LL.D. McMiiuan, W., M.P. MarIpen, J. H., F.L.S. MANN, John MANSFIELD, G. A. MINGAY-E, Jia ©. Hl. , HECrs: PEDEN, J. B., B.A. PicgtENiT, W. C. Pirrman, E. F., A.R.S.M. PLUMMER, J. PoLiock, J. A., B.Se. Roserts, Sir A., M.R.C.S. Ross, W. J., Clunies, B.Sc. RussELL, H. C., C.M.G., F.R.S. Sacu, A. J., F.C.S. Scorr, Professor W., M.A. SmitH, Hon. Syd., M.L.A. Stuart, Prof. T. P. A., M.D: SULMAN, J., F.R.L B.A. TEECE, R., F.1.A. TuHompson, J. Ashburton, M.D. THRELFALL, Professor R., M.A. TIpswELL, F., M.B., D.P.H. TurRNER, F., F.L.S., F.R.H.S. WarREN, Prof. W. H., M. Inst. C.K. Wiutson, Professor J. T., M.B. OFFICERS AND COUNCIL. Sav MEMBERS OF COUNCIL NOMINATED BY SOCIETIES: NEW SOUTH WALES. Bartow, J. B. (The Institute of Architects, N.S. W.) Docker, His Hon. Judge E. B., M.A. (The Royal Society of N.S. W.) DuckwortH, A. (The Economic Association of N.S. W.) Furper, T. F., F.R.A.S. (The Royal Society of N.S.W. and The Institution of Surveyors of N.S.W.) HALuican, G. H., C.1i. (The Institution of Surveyors of N.S. W.) Hep.iey, Charles, F.L.S. (The Linnean Society of N.S.W.) Norton, James, LL.D., M.L.C. (The Linnean Society of N.S. W.) Quaire, F. H., M.A., M.D. (The Royal Society of N.S.W.) RosEespy, The Rev. Thomas, M.A., LL.D., F.R.A.S. (The British Astronomical Association of N.S.W.) Wricut, H. A., M.R.C.S. (The Royal Society of N.S. W.) VICTORIA. Baraccut, P., F.R.A.S. (The Royal Society of Victoria). Kernot, Prof. W. C., M.A., C.E. (The Royal Geographical Society of Australasia, Melbourne Branch). SHEPHARD, John (The Field Naturalists’ Club of Victoria). SOUTH AUSTRALIA. Barnes, C. H., L.S. (The S. A. Institute of Surveyors). BLACKBURN, The Rev. Rr eae Sana J. (The Royal Society of South Australia). QUEENSLAND. Pounp, C. J., F.R.M.S. (The Royal Society of Queensland). NEW ZEALAND. Gray, George, F.C.S. (The Phil. Inst. of Canterbury, Christchurch), TASMANIA. i ee PLS. (The Royal Society of Tasmania) OFFICERS AND COUNCIL. XVi TUR] uyor f aUUINID “AA “8 “FT OS" WW Ou “PL “S"l'd ‘wopren ‘Hf Sa osd “WW Tease “VW “AA JOId ‘Ww ‘Oy ‘Vv ‘UvUy {Ig a a Soa “va pared “GM “iL ‘Jord ‘S'0'd “OTM S°UeH ITM ‘ory /S'v'ad ®qqy “HD +09 'g “ooTpog mnyqay *¢ WW “WePMGL “YL “Jord | ‘SOL ‘prewop SOM, Wee el “O"T'W ‘Sury +p ‘d ‘u0H OS" “WN “20Y79LT “CL - SSO Pee 1 WS)" “UTOMOH “A O0'd “VIN ‘eruueyy ‘HA ‘Fold = *’S'd‘W ‘Aowgpo_g ‘yy, paeyory ; VW aqATT “TL JOld SW ‘AvNVOW “XeTW “jOIg § ‘SV au: Ow iT “IO AI “CT “WL “WAR *f D Jord Sarpy ‘CNS UO WOM TIG [orserersereescrsccessesersseee Kudpis0eg— mq WOT}909 ‘10qooHE «= SOUR" OO" “OW acanocnunonadonhoodbooda riencabaD AS0porg—" w01y09g ‘SOU “SU UWA, (MM “qQ “JOrg [ts ABoperourpyy pure ABopoog—'p uorjoog sence reer eeeeeerereeeeeseeece Ayystumayo—'g WO1}09G *soIsAY T ‘OW UW A Mpovrieg ‘g |jpue ‘sonvuroyyeyy ‘Autou0Isy—'y UwoTqOeG *SOLIvJII0Ng *SJUAPISAIg-901 A. ‘squopIsolg *suoTqo0g "S6SL ‘ONILAAIA) AANGAG S3HL LV SNOILOSG 4O SFIYVLEYOSSG ANV ‘SLNAGISSYdg-F30IA ‘SLNAGISAY_ XV11 OFFICERS AND COUNCIL. , iy Mal ‘V'g TAeg "aL SVv'e ‘ueped “€ ‘f * ‘VW ‘uosiopuy slouRig ‘jold ‘Hdd “WYO “ON Teaspyy yea ‘VIN ‘U9 ‘0 ‘H A ‘WOW TN “HO ‘VW 0Y HY aT “WIN ‘uve “yw ‘uoTT “(TW ‘uosduroyy, uojanqysy ‘ff f'q'W fw fadaoyysuradg "Mf AWN “OrpreH “C “OSU “OD “98 ‘WW “Tania A “HM F941 ‘ ppysuryy “vy §'a'O ‘agg ‘Aoparyg uyor |'* worvonpryy pure sdouat0g [eyUEP—'f WOTZDeG ‘d0a1 “OTN ‘qpoqduey uvpy ‘UoPT oy, |" ouersAPT pur oous1og Areyueg—'T uoryo0g "H'O ‘909 ‘WV ‘WW “HO “4SUT “JX “aveysmiry “Ay “P| 9SUT IN WIN Someody “A |9SUT “IN ‘Yormouopy “Gg *W |" eANqooqpYOLy pue Suloeulsuy— 'Y{ Wo1yo9g ‘S'O'd “oqany “df ‘A'TT Vg ‘toseag uyor WN Stodae gy "M FOS TN “UOITEYS “I SAIN SURTLENOTN “MA CWA AV Td 9990 Dt) aie elt. CW ‘uLIMeTyOVIy “N “EL ‘aoyT Geis Vv IN ‘uosty "IT ‘Aey VN ‘qoouedg UIMpTeg "AA “Jord "S'S ‘oamyno “orp ‘moysuyor "PL “Yi-Msy pue souoIng ououdsy—"'y) UOI}OIgG ‘SOW “WMO AA WV |) ASopodoayyuy pue ASojouyy™—"q Woryo0g *solavyjoroag *syUIpISAg-d0l A *s]UOpISalg *suolqoeg “panwyuUuogIq—SNOILodg 10 SAINVIAYOAg ANV ‘SENTCISAY-AOl A. ‘SINACISAU XVill OBJECTS AND RULES OF THE ASSOCIATION. Obiects and Rules of the Association. [Carried at the Christchurch Session in January, 1891; submitted and confirmed at the Hobart Session, January, 1892; amended at the Sydney Session, January, 1898.] The 1898 amendments are in italics. OBJECTS OF THE ASSOCIATION. The objects of the Association are to give a stronger impulse and a more systematic direction to scientific inquiry ; to promote the intercourse of those who cultivate science in different parts of the Australasian Colonies and in other countries; to obtain more general attention to the objects of science, and a removal of any disadvantages of a public kind which may impede its progress. RULES OF THE ASSOCIATION. MEMBERS AND ASSOCIATES. 1. Members shall be elected by the Council. The annual subscription shall be £1; but after 30th June, 1895, members will be required to pay an entrance fee of £1 in addition. [Amended as follows :—Members shall be elected by the Council. } 2. The annual subscription shall be £1, due on the Ist July in each year. [Amended as follows -—The subscription shall be £1 for cach Session, to be paid in advance. | 3. A member may at any time become a Life Member by one payment of £10, in lieu of future annual subscriptions. [Amended as follows :—A member may at any time become a Life Member by one payment of £10, in lieu of future subscriptions. | 4, Members who fail to pay their subscriptions before the Annual Session of the Association cease to be members, but may rejoin by paying the entrance fee in addition to the annual subscription. 5. The Local Committee may admit any person as an Associate for the year on the payment of £1. 6. Associates are eligible to serve on the Local Reception Committee, but are not eligible to hold any other office, and they are not entitled to receive gratuitously the publications of the Association. [Rules 4, 5, and 6 are rescinded. ] 7. Ladies’ tickets (admitting the holders to the General and Sectional Meetings, as well as the Evening Entertainments) may be obtained by full members on payment of 5s. for each ticket. Ladies may also become either Members or Associates on the same terms as gentlemen. [Amended as follows :—Ladics tickets (admitting the holders to the General and Sectional Mectings as well as the Evening Entertainments) may be obtained by full members on payment of 10s. for each ticket. Ladies may also become members on the same terms as gentlemen. | OBJECTS AND RULES OF THE ASSOCIATION. xix SESSIONS. 8. The Association shall meet in Session periodically for one week or longer. The place of meeting shall be appointed by the Council two years in advance, and the arrangements for it shall be entrusted to the Local Committee. CouNCIL. 9. There shall be a Council consisting of the following :—(1) Present and former Presidents, Vice-Presidents, Treasurers and Secretaries of the Association, and present and former Presidents, Vice-Presidents, and Secretaries of the Sections. (2) Authors of Reports or of Papers published in extenso in the Annual Reports of the Association. [Amended as follows :—There shall be a Council consisting of the follow- ing :—{1) Present and former Presidents, Vice-Presidents, Treasurers and Secretaries of the Association, and present and former Presidents, Vice- Presidents, and Secretaries of the Sections. (2) Members of the Association delegated to the Council by Scientific Societies. ] 10. The Council shall meet only during the Session of the Association, and during that period shall be called together at least twice. LocaL COMMITTEES. 11. In the intervals between the Sessions of the Association its affairs shall be managed in the various Colonies by Local Committees. The Local Committee of each Colony shall consist of the Members of Council resident in that Colony. OFFICERS. 12. The President, five Vice-Presidents (elected from amongst former Presidents), a General Treasurer, one or more General Secretaries and Local Secretaries shall be appointed for each Session by the Council. 13. The Governor of the Colony in which the Session is held shall be ex- officio a Vice-President. [This Rule is rescinded.] RECEPTION COMMITTEE. 14. The Local Committee of the Colony in which the Session is to be held shall appoint a Reception Committee to assist in making arrangements for the reception and entertainment of the visitors. This Committee shall have power to add to its number. OFFIce. 15. The permanent Office of the Association shall be in Sydney. Money AFFAIRS OF THE ASSOCIATION. 16. The financia] year shall end on the 30th June. 17. All sums received for life subscriptions and for entrance fees shall be invested in the names of three Trustees appointed by the Council, and the interest only, arising from such investment, shall be applied to the uses of the Association. 18, The subscriptions shall be collected by the Local Secretary in each Colony, and shall be forwarded by him to the General Treasurer. 19. The Local Committees shall not have power to expend money without the authority of the Council, with the exception of the Local Committee of the Colony in which the next ensuing Session is to be held, which shall have power to expend money collected or otherwise obtained in that Colony. Such disbursements shall be audited, and the Balance-sheet and the surplus funds forwarded to the General Treasurer. 20. All cheques shall be signed either by the General Treasurer and the General Secretary or by the Local Treasurer and the Secretary of the Colony in which the ensuing Session is to be held. xX OBJECTS AND RULES OF THE ASSOCIATION. 21. Whenever the balance in the hands of the Banker shall exceed the sum requisite for the probable or current expenses of the Association, the Council shall invest the excess in the names of the Trustees. 22. The whole of the accounts of the Association—i.e., the local as well as the general accounts—shall be audited annually by two Auditors appointed by the Council; and the Balance-sheet shall be submitted to the Council at its first meeting thereafter. MONEY GRANTS. 23. Committees and individuals to whom grants of money have been entrusted are required to present to the following meeting a report of the progress which has been made, together with a statement of the sums which have been expended. Any balance shall be returned to the General Trea- surer. 24. In each Committee the Secretary is the only person entitled to call on the Treasurer for such portions of the sums granted as may from time to time be required. 25. In grants of money to Committees, or to individuals, the Association does not contemplate the payment of personal expenses to the members or to the individual. SECTIONS OF THE ASSOCIATION. 26. The following Sections shall be constituted :— A.—Astronomy, Mathematics, and Physics. B,—Chemistry. C.—Geology and Mineralogy. D.—Biology. #.—Geography. F.—Kthnology and Anthropology. G.—Economic Science and Agriculture. H,—Engineering and Architecture. I.—Sanitary Science and Hygiene. J.—Mental Science and Education. SECTIONAL. COMMITTEES. 27. The President of each Section shall take the chair and proceed with the business of the Section at 1] a.m. precisely. In the middle of the day an adjournment for luncheon shall be made; and at 4 p.m. the Sections shall close. 28. [Formerly No. 33.] On the second and following days the Sectional Committees shall meet at 10 a.m. 29. The Presidents, Vice-Presidents, and Secretaries of the several Sec- tions shall be nominated by the Local Committee of the Colony in which the next ensuing Session of the Association is to be held, and shall have power to act until their election is contirmed by the Council. The Sectional Presidents of former years shall be ex officio Members of. the Organising Committees. From the time of their nomination, which shall take place as soon as possible after the Session of the Association, they shall be regarded as an Organising Committee, for the purpose of obtaining information upon papers likely to be submitted to the Sections, and for the general further- ance of the work of the Sectional Committees. 30. The Sectional Committees shall have power to add to their number. READING AND PUBLICATION OF PAPERS. 31. The Committees for the several Sections shall determine the accept- ance of papers before the beginning of the Session. It is therefore desirable, in order to give an opportunity to the Committees of doing justice to the several communications, that each author should prepare an abstract of his paper, of a length suitable for insertion in the published Transactions, OBJECTS AND RULES OF THE ASSOCIATION. 0. x0. ssss0-csocme ue osmees once 38, 40, 41 Reports, Proceedings, or Transactions ..............:sses0se0s 6, 31, 42 Research (Committees ace eee eee eee enero 95, 375 40 RamleseAl tera bioniOl-oncgcccrecdiseeeecene meee eee eee 43 echoes MUISbIOL Sic gdes. saad cceies Gs Shea eee ne eee eae 26 NEechionalnCommMiibees ]{—06ST “AA 'S'N ‘AoupAS—gsst “*SOTIvJIINNG "SJUOPISOIG-d01 A *squopIseig ‘o0v[q pur oyvq y INUYUOI—NOILVIOOSSY DHL TO SNOILOTS AHL AO SAINVITMOAG GNV ‘SLNAGISHUG-AOIA “SLNACISAL (EME PRESIDENTS, ETC., OF THE SECTIONS, XX X11 ——————————— eee ATT CV'g ‘taser uyor UOJSOTY PTeqpoay THOS *.L ‘SOW WOUTeM “Te UOTE PT “W ‘V'IN ‘WOsty JoutlI0'T ‘paory ‘ATT CV 'e “toserg uyor ‘ATI VW ‘WOsty I ‘A0y "VIN ‘toouody urmpreg “Aq ‘Jorg "C'W ‘t01dqnery ydosor ‘OLIJoq SVULOYT, ‘dousi0 AA ‘yL ‘asnoyyzIVg “WL, “AOIVSVIN “TW “VW “ONL “WM “PAC “paeuieg soure pr "YAR[O VF100x) *paoyy ‘SOU W “avadory, preamp ‘SOW “Wex90H “WL “O' LW ‘Tee ‘Gd “AM ‘WOR ‘SO “IM0H 'M CV ‘auINog PH ‘SD'd “MoH "“M ‘V ‘aprepopy ‘dousa0 AQ sewoy J, ‘AoupAg ‘eA TonuIeg *paoy *aTLANOd]9 TT “Wy ‘“UOsIy aowoy ‘paoy ‘auInoq PN “SOU “MOH “M 'V WM “UR0g “Ov LW ONO 8e10,7 "¢“UOH ‘Aouphg Tomy 'w “ADOTOUGOYUHLNY GNY ADOIONHLY—' 4 NOILOIS ““A'S'N ‘SoupAg—ge6st “purjsu,d) ‘ourqsitg—C6g Peeb asleereS ‘oplejopy—E681 ‘VIURUISeT, “QaIeqoy —Z6ST "ZN “Yoanyoqstry—T6ST ‘OLA foUINOG|OIT—O6ST “AKON ‘KoupAG—Sgst ee ee eS *SOLIeO100g *SJUIPISAg-901 A, ‘squapIsorg ‘ddV[q puv 9}e(T a *Panurzju0O—NOILVIOOSSY FHL dO SNOILOUG ZHL dO SULUVLEMIAG ANV ‘SENGCISaY g-HOT A ‘SENACISaY see XXXI111 PRESIDENTS, ETC., OF THE SECTIONS, ‘SO “ouyny “qa ‘Vg ‘ueey “YY ‘(eINA[NOLSW) Toyynog wWeNITE A (aouatog [e100g) “TT “WW “woo “GY U0z0];91T "IQSONT SSIIVG “GL ‘S'T iT Suoysuyor “TT “YY ‘Aopureyyog “EW ‘Vg ‘uopurig oyyeg op "vy “VW ‘purpreyyng “v ‘SD "Ua ‘vopsny “YH ‘oA M “OD “VIN ‘toate * AA “OST ‘UOZTES “WW "VT W “UTIL “AA ‘Vdd “VT a 0007, "y C1001 “q'N ‘uluneyporyy ‘N “H ‘ao “UBAL) uyor "MOSIyV *XOLV URITOYW 10490q TeuucOon “HL | ‘OT W ‘ouudyy, “¢ “Vy “UOH "BLIOJOL A, “ey “ay ‘Sueppeyl uyor aig ‘o'> ‘uourkg “A '¢ US Tel ‘OQ’ ‘OLIMOT IOSsojolg “OW'O ‘Aquzoog yersor “AATIBO “f 'W ‘VH'IW ‘Usorg *¢ ‘N ‘aco ‘O'R “OVID “I “VY “WOH RR CRES EGE tal mia\ ‘ST ‘steavay, "T LM je TAD “VN “woysaIyTY “§ “f ‘Jorg “q1eq0H “SS CS" “uoysuyor “WY ‘AoupAg "VIN £9900g 1098 Ay OSsajoIg *Soupfg ar ‘W ‘uosapuy "T 70) ‘H ‘AoupAg “yp ‘90007, “WY ‘apiepapy POTN SUCH Og As) HOH ‘ROH “S"T A “Moysuyop “WY “aug PIN “DO W'O “to4eH “H ‘H “AYNLINDIYSY GNW AONAISDG WIS0G—"5 NOILIAS see MA ‘SN ‘KoupAS— 86ST ‘purlsu,?) ‘ouRqsiigg—CGST "essere QnTeTapW—k6ST ‘eluvUsey, “IVeqOF{T—Z6S8T ‘TN ‘qornyoysiuy9O— 681 “OTA SouINog]eIT—O068T “AN'gtn ‘Koup£G—geer *solivqoroag *SJUOPISOTq-901 A, *s]UapIsolg ‘20¥[d par oe ‘PantyjUuoo—NOLLYINOSSY AHL FO SNOLLOAG AHL 40 SAIMVLAMOAG ANV ‘SENACISAU G-GOLA ‘SENACISHU XXX1V PRESIDENTS, ETC., OF THE SECTIONS. ‘VW “9 ‘0 “H ‘HOW TW Sao “qsUy TT SAveysury “AA “fe ‘saOquUIVyD “AA IpPNVTD ‘DOTY “Moiy “Lf "URION "VW “OSPUPIA “AA “MA ‘TOT IN'Y ‘92009 “fe “"H'O SosyoRy *O “WV MOT “VIN ‘owed "A Vala d weg uyor OSUM ““H'O'9SUT TA ‘H CM «dossoporg “PIeysuryn “Vv “YD ‘TO OSU TA WIN ‘ouva(,, eet WW “HO ‘sdumd “9 “AQTIVN, prveyory "HOU WV ‘Aprag ‘q “VW ‘AO SUL WW ‘Aoqtueqgs ‘9 “H “p92 “HL “T'O'FSUT IN Foouopwy “g “Vv ‘OCT WN ‘Urey, ‘¢ “aOF ‘TOTI'V “DO ‘souree “MA ‘0 roshey “i ‘WO “ureyoury sours "H'O “qURLD “HO ‘HOT W “erg “NM ‘HO TW ‘Wed Jorden ‘oO ‘HOT W “Uosqodg “Wf ‘HOTIW “A'S Ud “COStIM “U “ay 'C ‘svyoing ‘VW ‘A'O “380 “WW “SIP “(O ‘H eter eeees eee eee eertereeerea WOT AA ‘oplepapy “HO 0g “WY TT “OO UL TW HOMO, “gq *V “RIUVUISE J, “mo 4suy' YL “ureyoulg seurve *pur[re7z MON CH'O'TW'V ‘9409 ‘CH “purlVoz MON “TO “MO TW ‘Ted widen ‘9 ‘Aoupfg a + ak fia a Oa ‘uvulpng uyor ‘AoupAg “nO SUT AL ‘GalieAA ‘HO “MM dossejorg ‘auIMOq PT “WO SW “QOUIOS, “O “AA LOSsojorg “AUNLOALIHOUW GNVY DNIYMSANIONG—# NOILIIS “ASN Kouphg—ge6st “purysu,?) ‘ouvqsligd—cggT Treereyree COpDTRIOPW—E6SI “eIULUISeT, “JVqOHT—ZG6SI ‘ZN “YounyosuyO—T6Sl "OLA SouINOdTeIT—O6S8L eee *M ‘Sg ‘N ‘foupkQ—ggst *saravjor109g *S}UOPISOT-901A “sqUOpIsalg ‘aov[q pur ojeq “panuyjuUuodj—NOILVIOOSSY YHL FO SNOILOTG AHL AO SATYVIAHONG ANV ‘SEINUCISUUG-BOL A, ‘SLNACISHU XXXV PRESIDENTS, ETC., OF THE SECTIONS. ; RG Gia: WU CQ TWOMsprL young ‘CW prey prard ‘CW “PMO 1, FRC “V ‘A'W ‘u04s80 “yf ‘SON a “DI “oudg *y “OH ‘uopsuky “gf “Wy ‘WO “AWN ‘UOSTIM “LL “£ ‘CW ‘uosdwoyy, uojzanqysy “¢ CIN WW ‘odaoygsuridg “4 *¢ ‘AW ‘oIprent “d "TW ‘9TH OE “TN ‘199 [RG aC | ‘WV ‘SOWA ‘sso, URIATA “A WI ‘A'W ‘TPM OCH ‘OL W ‘TWeqduey ueypy ‘woH ‘a'W ‘UNGID ‘O “A ‘aw ‘pavuiegd 7 6) ‘O"T'W ‘YsAq *°O ‘d “COR ‘CW TEM PeN ‘0 “ayONoZ op “T ‘d’'IW ‘99099 “Hf ‘£ Jossojorg “y'O ‘uopi0y “9 ‘4qsInyoyV ‘qd "V opreppy “Sd T'1 dN “OT W Teqdueg uvlpy ‘uo *OUIMO [OPT Soroarn “CW “ww ‘edzoyysundg “mM ‘Lf ‘qaBqoyy “ney “VW ‘AoupAg “ad "4s8Uy TW TdlIt\ “HO ‘MM dossoforg ‘oplvpopy og (ig INE “QW TWeqdwep uvypy ‘uo ‘AoupAs “Hd “q'w ‘uosdwmoyy, wojanqysy ‘¢ ‘ounqsiug ““q'IW “yjorourg “¢ “ANSISAH GNYW SONSIDG AYVLINYVS—] NOILOAS "rms ny ‘AoupsQ—g6st ‘purysu,() ‘ounqsg—¢6sT seenee Vv ‘a ‘aplejepY— E68 ‘eruUBUsey, ‘41VqOH—Z68T ‘ZN “YounyoqsttyO— 681 “Ord “OUTNOqTSIT—O6ST ASNT ‘foupAQ—Sgst *soLTeqoI00g *S] UA PISATq-O9T A, *S]UOpISATg *a0v[q puv ayeq "pantjU0I—NOILVIOOSSY AHL FO SNOOTY AHL JO SUIUVLAYOAY ANV ‘SLNAGISUUG-H01A ‘SINUGISMUg ; XXXV1 PRESIDENTS, ETC., OF THE SECTIONS. Sa aiayen ORNeCu Ta se ‘Vd “aopeg ‘g “£ ‘VW ‘dosiopuy siouerg ‘Jorg ‘(uolyvonpy) Aosdwog *f *(e0UdING [eqyUoT) “Wg SYooopoo My T af "V'g “Tequng "vy ‘¢ "Vd ‘Sunox “¢ “Yl HOMO Lai “VIN “WOSTIMA “W ‘yqiug uoskuusy, "d'WW ‘Aquoxy stnoryT ‘a1Oyoquoy, YT “A *so1v301009 ‘VIN 0" ‘H ‘YW ATT “VW ‘wearey ‘Vy ‘u0oH ‘Ainqpeig seuoyyy, ‘suoydaqg uoqunig *f ‘WW 0" “H preurseyy ‘VTW ‘ETT “Vg ‘sourkg ‘fp +7, ‘uoyy ‘OS'd “Wg ‘AopaeH “y “f TI! “d “H WV W ‘108 [nog “A “Wf "Jorg “ALTO GL ‘ABM dOI]SNE-JOI LOUOFT SIFT “‘Suno X [assy “YS[OYy SeMOYy, pacyy ‘CW ‘Mousy “yy ‘¢ ‘uOoR “UOSC ‘ON ‘sn “[[epuay, WO ‘VIN ‘Wepsey “AA “yf AOssojorg ‘OU SN] “OYIV[O uogpimepZ “f ‘VIN ‘toyony, Lossojorg ‘ourqslg “og'g ‘foparyg uyor ‘foupfg OWT ‘Mostopuy slourty Jossejorg “auINOd]9 | “Q'TT ‘oney Aruep s0ssojorg “9UINOG]P TA “WW ‘SIO, ‘| ‘W JOssejo1g ‘ourqsiig “WW “oy ‘HY ‘MtqoH “Ov TW ‘MOUSW "AA ‘f ‘UOTT “oplepopy “IT “WN ‘les[nog "A ‘WY IOssojorg “aw "NOILVONGY ANY JON3I9S IWLN3INI—'p NOILoOaS ee ee “S]UOPISAAg-901 A ‘s}UapIsatg "'"AA'S'N ‘Aoupsg—gest ‘purjsu,d ‘ourqsirg —cggT boooad ‘Vv ‘g ‘aplelapy—E6SI “BIUvUISeY, “JIVqo]T—Z6ST ‘ZN ‘Yornyoys1ayQ—T68T ‘OLA ‘ouINog|eaI{—O6ST “M'S'N ‘Aoupég—geer ‘aoe pue ayeq a ee *PANUNU0I—~—NOLLVIOOSSY GHL 40 SNOILOGG AHL LO SHIYVLAMOTG ANY ‘SENACISAUG-AOI A. ‘SINGGISaU Date and Place. LIST OF EVENING LECTURES. XXXVii List of Evening Lectures. Lecturer. Subject of Discourse. Christchurch (1891) Adelaide...... (1893) Brisbane...... (1895) eee Sir James Hector, K.C.M.G., MAD, HRS: Prof. W. Baldwin Spencer, M.A. Gaebine Mannenmn gs. cc sV TPL |: mogsurpoA |g ““spuooas Map [rs ope ft av TRE [occ wos | Zz sootes goa [oot sgogin foes av ORT [occcomouuarg |Z stajaisiete "S098 OL ee ceee “N09 “A'S DOUIIOGs PPL aera) Muvsuv A, Zz Judy see ewe *soas Z nae “MN 09 aS eee. DOD VAVAR “s*** oyvundg 62 ac“ eeeeee “S008 G ociceis erreNT OO! AACS scsiiOelereA TG eeee “ce 62 “ ee eed ‘00S T eae ‘Aa'N 02 °M'S OPDDOGS SE PAL DIE see. Muvsuv A, 0% “ Dey) g800819 ee [BOO "gd OF.Q [°° WORBUTTOM | ST “ARP eee "S008 & . “* ‘A'N 03 °A'S see Bomar caG i) see sy & “e 670) 001016 S008 ¢ eee . 1S 09 "MN see . xd 92-6 wee INU¥B.OUB A 1G “e testes agoag pT { Byer aes \ tees ygey [eco oyeundg | er sew “soos 1 ween ‘AN 09 “A'S . oe ed £8.01 wae muvsuv A IL “ce Seelela es 5 008 T Ce eT "N 03'S teenies ad 06-6 “e+ oxvundg 8 ‘ute “FEST ‘(amry, UvOTL ‘uolvaNg ieee ZN) 048 Bane : quaieddy uoTpoug qusieddy yo Suruuisaq dV ayeqy JO OUILy, ‘Wd=d $‘W'V=V : poyliea oully, , “LEST “SNY—FEST ‘puL[vez AON UT syooyg oyenbyyaeg 61 SEISMOLOGICAL PHENOMENA, ‘II “IA ‘IIL ‘I Tl) +°A J ‘IIL ‘I “AI ‘TIL “AL TA “Al ‘TIL + Til “AI “A 07 AI “A “AT 04 TIT ‘III ‘AI ‘TIT 09 AI ‘Teg [010,J-Issoy) Aqisuaquy « divys 1sayyey ,, ‘payseus Atayoo19 | paqsiag sautmryo {§ paddoys yoofo aoyo : daeyg |\sisiso heh ielvire a ee STUB ULOODe PUR papaoard ¢ OSION |" ‘SoOesS MAJ WV] “°° * § puv'n * 4d £66.G DDCOM TA ohh Ilia *[[ay sXauutryo OMY £ IVOI PNOT 09 SUIsvaIOUT “4Avd ANI] YOOYS a10Joq Surpquina pnoy {Tea “AN v UO Joyjour “eM ygnos v uo poddogs 3yoo[o £ "AA 07 “GY WOA, SUNAS JAssoap CaN 04 ‘TA |uo sdno {gavuis {surquina pnor Aq poruvduoooy wictereiolerere “MS 10) “AY pus ‘oT sees" 78a,g |°* YounyoIsMyO | 7 “any “G6RT “(ayvog : Coun uray 5 “uorqern ; "N)— ooUS t - [PLO YT-ISSOY) *SyAVULDY—Soo A qu sti d ae uooaug yuaiwddy ue aia ae dv ayed Ayisuaquy jo OUI, ‘panuyuo7—purlva7z MONT UL syooyg oyenbyyavg RESEARCH COMMITTEES. G4 SAT SPODOGO I OGSHOMODSEUNOODOUAM Tae: AVRO) shMoyooaine Uo liea(s| SPs eSL COST ()TI seers 4A OF “TENT sscaalcicerea (NEG on 66 G “ce —‘III sss cscsveleiegaraye sever oieleie/eTeleisheroteeuezehets)evcisreye clare ierereum enters ULSTER sec c esas theses oan Og “aN la FG UdoMeq ‘yqnouls[g MAN p “ “LOUD. a[qeiapisuod { saynurUL FT ynoge Surysvy asrou ‘yooys 1ajyjye puv ailojoq Suljquinat panuyuod pur pnoy “IA 0} °A |} UMOpP UMOTY SafoIqze OMZ 10 UO { pargyea ATaYOOID |o--* sods gy fo MON [tt gt eg ft’ fs Ja eG *paqaodaa ‘TIL |syooys qusys qoyo ‘ Jowady snotaaad Ug Susus SOORICOM YF 9 | ae a ee DOOD aAuyAEAE [[oooSen “ g “ ‘IIL SOUS SOC ORICHOGOGOHOOUOGG a Cores cehaliapaca) yan colle uhoiu cnt pal acs DO ODOOES Gani pp secret we eeee SOD Bh as Sed) tee ree “ec ra “ *‘poyvato SSuTpINg “AI 04 ‘TIL £ towl0.14 puv Sulpquin.t 4y sys Aq popoooid ‘ daeyg sees *s008 G se wenn nee “M OM Tqp |PDOoCB.CH xV¥ 6. tees “ € “ “SuNAS sqoolqo Sursuvy : 1omad} pu surquint pno, Aq papoooad : davys AtoA [tt *7** soas gt ft My OF fot? gv 88.31 |7°°°* ayvundg | ¢ . “taAdosqo Aq 4[A} Jou ynq ‘saoygo Aq pagoda. ‘10q +'IIL |-tuaqdog 498g 9ouIs (% GT 04 OT) SyOoYs [eAoAdg “davyg |** ‘soos peroaog foot OF AL | OV GB.ZT Qnoqy |'yynould,g MON | € se +'T{] |(snoradad) Surpquuna oqyeaapout$ poyvaso Surppinqg! davyg |****** ‘soase@ t+ COO INO Fah POPP 22 eve BEALE |] 2 2080 G ss + TIT POD DOTCOORORTOOVODO GOON GANG Aye} GO SLiva(ohMadaee GNI Co] 4 CS) “+ ‘goas plo g tee “55 9 of @ [°° 203.6 gnOgy |°° “ V4 “ce “TLL Pee eee ee ee eee meee ene Yyooys yysys $ Suyquina yysyg sisheensis. © SOO Bur, arr sieielel alow: qnoqy sees “ee “ “IOULAIY PUY SuTTquMa snoradaid “AI jo[qvaapisuoo £ papqqer Atayooo pue payvato surpjing |********"soasg [os MN OF mS [oC vog.b [otto tt ayeundg | T “990 STITT huauaa estes 2 yaa SOOTLUACTA daeys puv squint ope1aposy ee eeceee BOGOR GrINAOM ONS) OO GeCepmenngtorense ooo muvsue Ay 6Z “ “sulyquina “AT [OU * att a[qQvtopisuod soy Sunms sdwe : davyg |'*'*+* suas ot |'°*°** (MSOF HN [ooo gd OST |'ygnourdtg MON | 8 “ “UJOS WO BUO OST { S[Iejap OU ‘AaquIaydag 446z UO SyooYsS ANOJ Os[V ‘(snotaoad) Surpquina pnoy paw Jouiel4 suoys {paaowt saimgord ‘sunas oop “AL |‘poxvaso pur payor Surpring § yooys a[qnop davys BSN POS OS OON RIS}. |[PCOICO CANA NR ON Tqiqs} PO CBOO lake zap [9000 ss SZ ‘TI ee ee ee ee ee cece (snotaatd) 3 Ssuryquina pur 1oUIATy FUSS eee e tees 098 T a0 alejajas) vale “M 04 “a sence aV 02-6 eee “ec 8G ae “(T) ugze “(T) u3¢% “(T) Jaquiaydag Y4pz ‘syooys T2YIO “WoUuAvd jo sv “q10do.t ‘TIT |¥ 10938 Spuooas XIS 10 day oulaty pure sane Alu (eig(s} (JPOP M PO OCT HRY FA, |PPCDOGGIEG OVW Gi Gal |IPOODGO etree) |loooo oO eSiNtalgy || Ga | AT Pace ca a aCe ei) SUOTIVAQIA davys pae arquina pnol AWGN ecce cece seen “TUN 04 “MS PECHUIONCICHCCG =; 1G.8 sess “e 7 “ce ‘TTT | suomeaqra may @ pure ‘4jof davys ‘atquina pnor 19qyey siatstere Shere ag ot NOP TIG See ead OS: Ou las ss @ ‘4dag ‘THE |. «suosaed Auvut Aq gyey S ,,dareys ,, 10 ,. 9USIIS ,, pa ot Scape helelals WStuprugnoqy |**** muvsur | Te “sny “C68T. ‘(ayeog Pees (atu, LAN Teuout-iss04p) ‘SyIVULOY-—SIOIYT Ry Hike qe ‘uoloaag quoreddy 4 ae ‘20Uld “oe, : jo owt, ‘panw17U0I—pUv[vVaZ MON UL syooyY oyunbyqaegy SEISMOLOGICAL PHENOMENA. ‘SUOTYLAQIA OYVIOPOPT “998 T UVTY SSOT JO S[VAIOQUT + "TIT 98 ‘(punors19pun sMo[q oy1]) SuUOIsO[dxO pno, aaty |'*soes og ynoqy |°"*"° * “G'N 09 “A'S ui e Gy lec ccaes ae SUOTPVAQIA OYvIOPOLU UdYY f a[quIMa pnory [77s SOORICT iv" 72" ’-"d'N 09 (M'S sg T ‘4dag Sie pe Oe Aas SUO!qBAQLA daeys May pur ‘uolso[dxe pnory “AN 09 (M'S ‘ Resta: eh fH al baa si BO ea “"*"* 9srou ou ! suolgRAqIA daryg “'N 02 ‘AA'S Tnuvsuvay | 6G “ony ONG Fil ooo Peg Re bene eee wee ee eee Surpring jo Suaryro Ra) qusis see eee “MOF “Tl eee oyrundd FS AVN + Tif ee me ee og a suomeiqia davys : oiquina prot DAs She SS TINTON AAI Bet a To a — Tl oC SsuOTVAqLA MO] puv UOISO[dx9 pnory peletsiehe Sr NUOdUsALS muvsuva | 6L “qoaq *\f, 1ojJv pure) o10Joq 1009.14 +°AT |pur Suyquuna posuojoad £ uayeys yonut “or ‘Ataxo0rg |**°"****"s0e8 OF |°°°"** “MN 09 “A'S |°* I 8P.2 Qnogy |*°**:* oxeundg | 02 “ SANT, || see cee "=" orquand ou $ poyggea om * BIOO) i * 2 "Soas Ge . ‘AN 02 ‘AL'S 7 Ty LIV cee IMUVSUL A, 0Z “cc “IOV SONUIUT GT SLOWWIAY 99AY4 IO OMY | YOOYS 109] puv a10joq qowUady pue surjquna pasuojord | pue “AT a[qerepisuoo + ! syoafqo afqvaout JO souRqIngsIp ! * davys eensienels is Sienna pes "MN 09 “G'S [°°°*** 4d 65.8 “***sonvundg | 9 ‘S “CLI tee weweee POOPIE REE CL Oo ALOR OOF So 0 or 2 AO utah (s o- ** S008 Z BRO OOE US Sos wath pag seeee xd 40-6 “uuoyuetg | 9f “ure “968T *(a07JV puv 910Joq) 1OWINY pur Saryq “AT |-Wind ponutzuod Suoy { poyazva Adoyooio pue smopurAy |" ***s99se MAN M 09 O'S | xd 68-6 DIDO eb HOAAeKOS || (aye fe “AL Oye eee aes ane woes oe TOT CLOAO NT UT UO 8.0; “suru @ A[AvaN . “slr NT OF “AL'S seererexel set Oak eae IMUBOUT AL 8 monya +'III ee ee ee ey Se ec ued ges Be Beg ot ee ag eee eee ORT ay eee NSCOR IT eee * "M'S 03 “O'N OOOO Sif (aha eee “sree 6 oe oTquINna Ou £ payygra sqy.SioM-Yses “AT [paw ‘smopura ‘s100p : AT[enpvis popua Bey jig afs¢ [PA RBOP DOM tags) POOOCD Ae Ki Garo O/W\Is{ 22M OCTO. Aatsire “"* InuvdueA | G6 “AON _ ‘Sayqrunas +'TIL |puv rows, snoradid 4ysts f payvorio Sutpring fdaeyg jt tt tsoos PF [°° Dee AO Nsl i usec) CTE soles OVUM) GZ es TIL BUSNSRE cher ee Sao ee gee une See Nera ee oe 2 CUI TTS ee se ewes "M'S 03 ‘ON Let ea) IS 4d SLT “ygaours|g MONT (14 “ce ["UO}SUTTJOA\ UT JUOSG IOAIOSGO ! NUSULAA 4¥ paztodoa SYOOYS 9914} 10qG0}00 YYST put pug useayog) ‘TLL POPLs eae Rath F221 $1422 LAL SEEAS LER SARARL Sabo LS eee ewes “008 T ee ey "M 03 “OL se neee 4d GG-P. see ee ii LT “ee + TIL Pod edns See eves tees s |< Doeywalo sous oUlpl len g pists slot e/> Furquuint pnoy !pexeerio surping-* davyg |9-+**"--ssoes eg) feces AN OFM | ve 8P-CE | exeundg | gg f =—oift Coss es occ oode DAOC Rp oGanbod sah asiou ou £ 4UysYs A1d A, BROOSDONG REIT SUBSCODOOT OHV (oy Gap |OUPosoIG 00 4a fe DOOHOOD GEHL || {3 “6 *IOUI9AY PUL SuTTquina snotadid a[qviapisuoo “AT |£sqoofqo a[qvaour Jo Sul[yqyvt puv SULSUIMS { oJelapoyy °° **'s0aS G09 Go fo CM OFM a 8ST ayevundg | p Ane 288000150 0UGUD SOON DOGOH DER CB OAD oD GURU Me GAi tS Selec SOORIOT nee RNG ON GANGS |e seals ve QT e() tees mursuv A 6 oaune SIN TOL Tide [POPC OP GORE OU DAOGGNS yaya (: davys uoyy ‘ Surquna Aavay BOCOOS OSHA ATS (jyE |[PCOADOODOD SOR eToW|S| OOHIOS arya) ynowATq MON | 0G ART "Th (Paes ose see Sutduvdwoooev ajquina pnoy & £4y5I[s SENOS RONG FOOD OAV Calon Te fap IPO POOROo Lair at) COBOODGD FUyaK HV € [udy + TI see SO OOURGO DOOD COUGoO OG ONDOUO GOOD Hy alariae olor GOKKITS| EODO00 COG EYS) Ent SOODDE GONE (onl SARA TS| TOO ODOO Sa Kr? sees muvsurv AA 1g ‘Av ‘astou OU { SIOT[OPULYD JO UOTIBAGIA § AaYOOID i a Jo Surypyqyvt { qusutaaowu Suyvynpun ‘Apres aoe ple Saks Hs OB prsheiersieh SAK INT ee SOD ODOT at Ya [PSPC nahalojoorcentgy || rd - . G0 00100 OUD DOD DOO UD OCHA ACOODO OO OH OUSCOOO OOOO iif: eeceee “soos Z coves eoare . FBNBOOUD Aaya tr eeeees TOSTS 13 ‘ AT Se ee ee I uayeys 1ayooro { daevyg Xcel ti o8)()G PODOGDIOAD, Geigy INP 12° Salim cnGEG SEnonO TCT 1% 73 SEAT (os YOOYS alOJoq ‘soos Z AO T Surpquuna {darys AqaA |e soaS HP OFAN | ad £6 Pe UTOMLE | |Z mies Espn eet “++ suoreaqra Ysidaeys pu aqua pnory | (qnoqe) ‘soas Og °°" “AN OF CM'S [Td 6 | TnuesueAy | IT ® “ ‘IIL cs ee ee ee dAIAIS SOT ee 220090 CANIS! Ie PAN piessliche 2D OC LG ee wee [aa 9 “ee “AT |A[QUATOIA poyood Surpying {avapo uoroaarp Jo voueplag |°*°****SOOS GT | CANS OFTEN Pe BP eyeye | 9) qo *(0US) ,, SOJNULUT E IO Z JO S[VAIOJUT 4V ; — [IT |‘stowio.9 ySys pur sapquna pnoy aayyea AuoMy AT[N,, |Gova ‘soas Moy V |" “A'N OF "M'S | 08-6096 |°'°* InuvsueA | Fo “ULL “L681 ‘TI ey Sulpquunz yystys Aq paMo[[oy seers seer SOR eee eee ee "M 09 “7 seen ee ad O18 "777+" o9yvundg 1 “cc +-TIT larquima ou § gfof sayjouy uoyy ‘suoreaqra Moy pure gfor |*" "°°" +" "S008 0B |" CUN OP CMS [a Sh fo Tnuesuey | 3 ‘Ad + TIL ee ee (atojaq) Surpquina pno| {davys seee ‘soos vale eee “MS oy “AN . eee 4¥V CLL ee uOsTANT 61 “AON + TIT |Surpquina puv 10ut044 snoradcad yySys poyvodo sarpying |**** Fes ||POOCCOOS SO CAV oMy dap [OOS OOO | rye "> 9yvundg | 9g. “S "AI Oe ers 61) UR | “on ‘s100p udyy Salquina MO'T BODO O00 DUH Ib OIE eee eee “ACN 04 “M'S see e wees Vv GZ.G see TNUB.SUT A vale “ce —'Ill DOOYOO ORT ROIOUNO OGL. CODOCOUO SOON OO Wp (fet) UAOhY EaLH (Sl ee ed "M 09 “OL ee dG.1 of "e's" TLOSTON p "490 SGT ee SUOIYTAQIA qUsty udqy £ arquina MOT Ooty Oe * "S908 OL eee ee ‘AN 04 “M'S Sn enele, d 9G.8 +. . “e 66 oe TIT [oc suorgeaqia FYB Ueyy { UoTsojdxe pnoy |" "s008 OT | “UN OF MS [O88 Gz.6 | Muesuey | gs “qdag “O68T *(ayeog ‘uoneand) (out ay oN ee) “‘SYIVULIY—SooH A qu sey ‘uoTqoortg yuorvddy A pee ‘90VT a4u(q jo aug, *“PenurjzUodI—Ppuesl[vaZ MON UL SYOOYS ayenbyyegq 67 SEISMOLOGICAL PHENOMENA. “A 07 AI ‘AI ‘TI “AI “A 0} “AT +°AI “AI 09 “TIT “(aywog [9104 -1ss0y) Ayisuoquy *patqgea Joor uo uoal £ yooys davys uoyy ‘Furssed apoyyaa jo sv apquuna Japno, uayy ‘lapunyy guvystp Jo sv punos v ‘4sunT “lopunyy JULISIP OI] OULquNA MOT 7°30 ‘polzvA AdaxoorD seeeeeresoesorrs Strrqund AO, Aq poruvdwuoooe Qusis *pargqer AABYOOIO PUT SMOPUTA £4.100 BOY] SuTTquins soy + 4qystys treeeresee orqruns Aq poluvdwuooor ‘uoyvys oungIUIny *poruvdtooov apqtuna f osnoy ouo UT [AJ AO4Sv[d { popyzva ‘090 ‘s100q “SuTquind Wayy q10daa pnoy £ papaya {090 ‘stoop { davys ‘yooys afqnog rereseereeseeessuoeys Sa[quy { A[JUdTOIA UOYCYS SOATAA ‘syIvWMay—spoyq Ur) eepee *SOOS 0% 008 FT ‘008 "8098 ST 04 OL tHe RDNg OT Hees 8908 BT rere eB DDS OT ECO) OUTRAATG | quoieddy A ures “WS 07 “MN Pere se wnee "M'S'S 09 “O'NON teerer rg og en “A'S 0} “M'N mee" “A'S 09 CO'N ‘A'N 99 “A'S “ON 09 “A'S ‘uoIpaug yuoaiwddy "PORT ‘vIVajsny YyNog ur soyenbyyaeg RODDOO OD a ieh aT SOUDOOGrr ar i Hrereeees 7g sreeeeee TOROT ad 86:01 #V §F-01 * ([vo0) SL-T *(poylaay) oUILL, UBT aprivjopy ‘ouny, sreees guUeqTOg sree. UGIMUNE “trees epunusy | IL ‘300 er eeae epunpng L “ec vcr upundey | 4 ‘sny “'eysnony Wwog |Z *(OSnOTT "T) tprog odup | 21 “avyy (119, U9A0N) S1oqVA AVC | FL “GoW “POST 20U ‘oyvq RESEARCH COMMITTEES, 68 “UUUMOL) “UISTAS 20 ‘UOT{worysaAUT [vroods v Jo yoalqus yg st yorym ‘Av UIOL UO doUEG.ANYSIp 9VOIS OYA Surpnyoxy » wiliTeell essen ECO E “* SMOPULM 3OoYS £ 4ULSITS ST Vale ee veeesss ss OSTOU SUITQUIME TQM f10td81g 4OUS VIL | ot poygges uoat Joou S astou Surpquana *! towos.ay, “Ti Cee er er i a a | USS “UOIYUSUDS HULUMLIYOIS “TIT 9} ‘IL | SOWJo MOTaq YSnoy} sv ostou pnoy $ rowdy 4I0Yg TH | payggea smoputm { ostou pnoy § 4[ay Lowr.ay, STM) |escarasatiss swcueieyelareln slate regeretersisroraievio's/atelens e/a cd\iiefax- yooys daryg “TEL [°° fogye spuodes ]VadAos8 LOZ SuT[Quina YAM ‘IOWA, TU sserssse ss TOpuNyy al] ostou pnor $ Sutppimq yooys Oi. |OI Tee caSbOGoRS acATHGe Ss wen e we eee Suryquuna poy a) ee a) spoys puv ssurppinq yoous *sqSOU Ilo} JO Jno paud “AL |-JUSLIY SolrvUvO pur pa]}ye1 SMopuUIA $ UaYLYS A1dyooID FAT Pee "7" SMOPNIM JO SUITAQVI YONUL £ Yooys sasnoyyT SATOMI ies -- "Ts Qioy Suryoor $ popyyer smopura ‘{19 yoo SN ifm Poe SooenbOo ooo boo bu nOCSDGROUOTONO yooys sSurpying “AT 03 JIT |'Aavay Ataa payqyer aopurpso duyy a9M09 £ yooys dueyg TT | ssurppinqg yooys AQysys { sayquina pnot Hine |Psssooow cana o« sete ween * Suryquima MOL £ 4a} cota, TW ccc tts tt ss yooys Surprinq { estou Sayqumnyy AP [rete eh eee eee eet eee ee Toutagg sy STIS ‘(oyvog [910g -1ssoy) “SAIVULAY -- Joo Aysuojuy ‘Wd = ‘d CW'Y = 'V S aully pavpurys ** "S098 CT 09 OT bits esesgogg @ “*""s008 GL “°° "S098 GT “"*s008 g ‘O10 MOS "S008 9 ‘soos 08 ‘soos ¢ "S008 0G OINUTUL v J[VET ** “sos ¢ ynoqy ‘soos G ynoqy teeeeee Uggs y "7" "S998 8 04 ZG micyaunena | quouvddy W'S 09 “AVN ‘quoirdde gon ste ee oer OF TMA * “WN °F "M'S Ps on NT “G'S OF “AVN He oer On AL “7 * WAALS JON [9 UOAIS STe~MoyAVT “Aq “N03 “MA Sq 'S “N 04'S “W'S 07 “MON “A'S 09 “MON * “WN 09 “A'S qoajap you prnoy ** 91QBAIASGO JON org 09 ALN “++ -quoreddv yon ‘uotoomq quoavddy " 19-8 " d TPF-0 "4 EFF-0 TevSO" onda “Vv OLP “VILE eae VF yNoqy OUT, 9 ynoq Vy “8 gnoqy OSpUg AVANT “*** BpISpoO AA Sees oe TORII NT sores gpundvyy ores epunpngy CALCUL AL IOY¥ MPT BUvyLO MULE ULLULY Ct 7 uTMARd 910g rete ees proud ° ‘a ‘g ur Ajjuen -asqns pur ‘£uO0]OO AIAO [[V “*"* guoysprpy “> UMoja.5.1004) "o55 GIeqvUlM Freese eptoan ‘asnoy, -4Yysiy pury.1oq “un yyaonN oda kis WRU Ep vs eueqpog seers’ UCM” ‘a0Uld awry x LOST Ul elyergsny [ANOG Ur soyenbyyleny SEISMOLOGICAL PHENOMENA. 69 VICTORIA AND TASMANIA. The great South Australian earthquake, of May 10th, 1897, was felt at several places in Victoria and Tasmania. The only other shocks for the period recorded since the last report are slight shocks at Harrow (4th June, 1897,) and at Omeo (5 a.m., 27th September, 1897). NEW SOUTH WALES. No returns. COMMITTEES. RESEARCH 70 ‘Arvqoto0g oy} 0} uoyeordde uo ‘yoafqns oy} ye Saryiom ouoduv Jo [esodstp *WITHIOD *[otUSTag ayy WW pooryd oq [ITA Avay ‘ayy Aq porddns syreyop 19430—"d'N ‘TA OFA ‘siv9at OM} IOJ JSOTAVIT 4YSNp Jo Tv} puv ‘snonurUod puv pnoy o19.K SUOIydNAD 94} Y19Z 0} UIST WoIg “4SUT HIST Joye oargou Ce i a OIDAOS $saadoa]s 9YO MA Ce ee ir i a i ie iris syooys davys 00.147, PIIBOOSIOVOGONOOUROOO GS Fray (2/6 (aH (SLLLCO) v ‘om ‘sdadaa[s ayOM {syooYs a1BAVS OAT, J "esses SMOOYS FUSS Oat, eee syooys davys daly i ee er ray te eeeeeeescecessevees savas HOOUS { a19A08 A[OZRAIOPO] ee ey yooys oqnop $ AIIAIG "III 94 II Ce SyOoYs IYSYS "AI Simslases eceeheyshaia, shel saes eis, sheheceless!s}-cefe laa ‘asnoy yooys $ dieyg ‘dno1s ay} gnoysno1yy 4J2} are syooys gong ‘ow ‘surq ‘saj930q yosdn { sdno ‘ITA |JO 4no va} 4[Ids fsaajoys Yo syoo[D Moayy { a1dA08 AIO A TTA [ooo tet ees tees ees* grag UO: Selsip poAout £ a10Aeg JA ODA [ott t ttt ttt syueg raz@M yooys { saodoas ayo. { davyg ‘(eTwog ]9.10q-1Ss0y]) ‘SyIvMoy—s}o YT Agtsuoquy te here se RDag G steers eeegogs ge reese enegggg GT “UTU FT OF *UIUU T "S008 CP “UOTIVAN(T, quoirwddy eee eee veeeee NT OF A'S 6 wees “ce rai ES G ‘ sees “ f T aT age weee ae 8Z “ce eee “ cL Oe “ aeste cS |9T FT nl §S'9'g “ eeee “c G "AON sre" TSISVOM | GZ “490 *y99% pesveo uoldnag oq 0} UBSEq OUTI[OA S700 and Gaba0o60 deoGoe “ {eee 19h “ce beer eee wee *"N 03'S BORO I DONG IE yan se eeee “ z “ ey "N 03'S eee ewes dG.G teense “ce Z "990 “M'N 03 “O'S WoL OODDODOD Areas) teen ee o 8 “ A°ANUN O24 H'S'S [OC GPO fcc" TSIseom | 9 any “S681 ‘uoTpoMG quaIeddy | “([eoo'T) owly, 90R[T aqrq (‘Avr “AQ ‘Aoy Aq poqarodayz) TA ‘1A ‘FTE abod wosf panuyuoo—egg] Sutmp ‘sopliqoFT MON ‘vuURy, ‘TISTSVO AA 4B sayenbyyaedg THERMODYNAMICS OF THE YOLTAIC CELL. Ye: No. 2.—“ON OUR KNOWLEDGE OF THE THERMO- DYNAMICS OF THE VOLTAIC CELL.” Report of the Committee, consisting of Professor Lyle, M.A., Mr. W. H. Steele, M.A., and Mr. E. F. J. Love, M.A., F.R.A.S8. (Secretary). INTRODUCTORY NOTE. Your secretary desires to report that, owing to the removal of Mr. W. H. Steele from Melbourne, the active work of the Com- mittee devolved on himself and Professor Lyle. The report which follows was therefore drawn up by your secretary ; it was after- wards discussed critically by Professor Lyle, for w vhose valuable criticism your secretary desires to record his sincere thanks. REPORT. 1. Preliminary. The application of the laws of thermodynamics to the voltaic cell was first made, in an incomplete manner, by Lord Kelvin,* who showed that the e. m. f. of a Daniell’s cell could be deduced with fair accuracy from the results of thermochemical experiments and Faraday’s Laws of Electrolysis, by an application of the first law of thermodynamics alone. In the second of the memoirs referred to he shows, however, that this conclusion cannot be regarded as general, pointing out that the ‘whole chemical action” is not in general—and may possibly not be in any case—- electrically efficient, owing to generation of heat within the cell. The equation given by Lord Kelvin for the Daniell cell may be written— WS (S.6e): Ah toe ee CA) the notation of which is too well known to require explanation. In this form it was made the subject of investigation by many observers, notably Favre, Raoult, and Braun ; they soon found that it was far from general, and to Braunt belongs the credit of being the first to suggest the application of the second law of thermodynamics to explain the discrepancies. Almost immedi- ately afterwards Willard Gibbs published his two epoch-making memoirs{ on ‘The Equilibrium of Heterogeneous Substances,” in * On the Mechanical Theory of Electrolysis.” Phil. Mag. Dec., 1851. ‘‘ Applications of the Principle of Mechanical Effect to the Measurement of Electromotive Forces,” &c. Phil. Mag. Dec., 1851. + Wied. Ann. V. , p- 182, 1878. t Both are contained in Trans, Conn, Acad., iii, 1878. 72 . RESEARCH COMMITTEES.- which a sound thermodynamical theory of the cell was first propounded, Four years later, Helmholtz published the first of a series of memoirs covering between them nearly the whole of the subject. A report “On the present state of our knowledge of the thermodynamics of the voltaic cell” is practically a summary of the work of Helmholtz and his successors. A word should be said as to the form this report has taken. Tt practically amounts to a sketch of the theory of the subject, pointing out in regard to each of its divisions the shares con- tributed to it by the different investigators quoted. In this way the advantage is gained of a uniform notation in the development of the theory ; it is hoped that this will render the work more valuable than a string of abstracts of papers arranged in order of time would be. 2. The Potential Energy of a Reversible System. Let the intrinsic energy of any reversible system of bodies be denoted by U, heat supplied to the system by Q, temperature by T, entropy by ¢, and the * parameters——independent of each other and of the temperature—which define the state of the system by p,, p., &e.; let the external work done in the variation dp, of any parameter p, be denoted by P., dp, ; then the first law of thermodynamics may be written— AQ= sy aT +301 5 +P. bap, .. (1) and the second law is expressed Ae Ley OF 1 sn oU ) dja eed Dito Saisp thle (2) fs From (2) we obtain at once ab tO ee op, ‘TY Cop, re Ss OT a, ae «an. @) es I Car whence cp 6U bp, Os P. ) Now suppose that the transformations considered all take place a omar then (4) may be written 5 (Td De aus wee .. (Lbis) * 7 must be finite and integral, but may be as large or small as we please. In ordinary thermody: namics n=1, and p. =volume of unit mass. THERMODYNAMICS OF THE VOLTAIC CELL. fa To explain this relation ; let us suppose, for example, that p, denotes a position co-ordinate; then dp, is a displacement, and P, the corresponding force. We see at once that I'd — U is numerically equal, but of opposite sign, to the potential energy of the system. Since this always holds good so long as the parameters are really independent—whatever their number or nature may be—we thus arrive at the following general law :— In any system of bodies the potential energy of isothermal transformation is given by U — T ¢. If therefore we wish to investigate the direction in which, or the extent to which, any particular isothermal change will take place, it is with this function U — T¢ that we have to deal, and not—or at least, not directly—with the intrinsic energy or entropy of the system. 3. The Application of the General Law to the determination of Llectromotive Force. Joule’s law tells us that if a quantity dq of positive electrification traverse a circuit in which the e. m. f. is #, the energy liberated isothermally in the circuit is # dq. By suitably arranging the circuit, it is quite imaginably possible—and very nearly so in practice—to obtain all this energy in the form of mechanical work. Let us suppose the necessary arrangements for this effected ; and let us further assume that no external work is done except by the ec. m. f. If then the source of e. m.f. be a reversible cell—z.e., if the transfer through it of a positive quantity d q in the reverse direction undoes all the chemical and physical reactions produced by the original transfer—we have at once :— te sy . B= —y (U—T¢) © (B) as the thermodynamic equation of e. m. f. This fundamental relation was first obtained by Willard Gibbs* ; the more general relation (4 bis) was subsequently—but independently—obtained by Helmholtz,+ who developed its consequences in a series of memoirs. t The quantity U—Tq has received different names from different investigators. Gibbs calls it the “force-function for constant temperature” ; Helmholtz, the “free energy” ; Duhem, the ‘thermodynamic potential at constant volume.” ‘‘ Potential energy of isothermal transformation’§ would probably be the best *Trans. Conn. Acad. iii., p. 509, 1878. + See first of the memoirs cited in the ensuing note. ¢{ Sitzungsb. d. Akad. Wiss., Berlin, 1882; Monatsb. d. Akad. Wiss., Berlin, 1883; Sitzungsb. d. Akad. Wiss., Berlin, 1887; Wissensechaftliche Abhandlungen von H. Helmholtz, Vols. ii and iii ; translated in ‘*‘ Physical Memoirs” of the Physical Society of London, vol. i. § This is really equivalent to Gibbs’s name; but physicists are more likely to talk about ** potential energies” than about ‘‘ force functions.” 7A RESEARCH COMMITTEES. name for it, were the phrase less cumbrous. The term “free energy” has, however, become well established, and will therefore be used in the rest of this report. We will represent the free energy by F, so that F =U —T@q; we see at once that F depends only on the actual state of the system, since U and ¢ do so depend. 4. Consequences of Equation (B), Electromotive Force and Thermal Chemistry. The first point to be noted here is that we have no direct relation between E on the one hand and the differential coefficients of U on the other—i.e., we cannot deduce E from thermochemical data alone.* We require, in addition, to know the temperature of the cell and the entropy changes brought about in it by the passage of the current ; in fact, we can only calculate the e. m. f. of arrangements for which we can determine beforehand the rate of variation of F. On the other hand, the converse problem—viz., the deduction, from the electrical behaviour of the cell, of the rate of loss of intrinsic energy during the passage of a current—is often important, and can always be solved, since, as we proceed to show, this rate of loss may be deduced from a knowledge of the e. m. f. and its temperature variation. Since F=U —T 4, SOE cy OW nat Soh. “sn on 8 Tow! but, by equations (3), 6U do ens UTM sate Ou Ty 6k Vine 6 or T & ey * In other words, Lord Kelvin’s equation (A) is only true provided do == (0) oq i a fact which at once explains and disposes of the long-standing difficulty as to the difference between the so-called ‘‘ chemical” and ‘‘ voltaic ” heats. THERMODYNAMICS OF THE VOLTAIC CELL. 75 Differentiating with respect to g we obtain oe 6 UL T oe Gz Sa. OD = OF ONS. == 7 (7) since F depends only on the state of the system but sa =—E dE 6U : -E—TSa a : seen (Oo) In accordance with Faraday’s law — ae simply the algebraic q sum of the heats of formation of one electrochemical equivalent of each of the active substances produced in the cell. Since the heat evolved in any chemical reaction is, for a given temperature, simply proportional to the amount of new substance produced, we may write (5) thus H = E—T 5 Be a ey (2), where H denotes the net heat evolved by the formation of one electrochemical equivalent of each of the active substances. H is of course reckoned here in ergs. If now we denote by o the electrochemical equivalent of hydrogen, and by J the mechanical equivalent of heat, (C) paras ee eS eee Sr where H' denotes the ee sum of the “heats of formation” — as ordinarily tabulated—of the solutions in the cell. This calcu- lation enables us to deduce thermochemical constants from electrical data. The equation (C) was established by Helmholtz* in the first of the memoirs cited above, and is now well known as ‘“Helmholtz’s Law.” It has been verified in a large number of cases, and now takes rank as a well-attested physicallaw. The first experiments on the subject are those of Czapskiy; these, however, did little more than indicate the superiority of Helmholtz’s law over the relation advanced by Lord Kelvin ; they cannot be looked on as affording a rigorous verification. This has since been supplied by Gockelt and Jahn§ ; the lastnamed observer determined by means * Helmholtz’s method of investigation differs from that given here; but it seemed advisable to show that the law is directly deducible from the properties of the function F, 7 Wied. Ann. xxi, p. 209. ¢ Wied. Ann. xxiv, p. 618. § Wied. Ann. xxviii, p. 21. 76 RISEARCH COMMITTEES. of an ice calorimeter the heat evolved by the chemical actions taking place in a large number of cells, whose e. m. f.’s he also determined ; the temperature coefficients were then deduced for the different cells, and found to be in good agreement with the values determined directly, in some cases by Gockel, in others by Jahn himself. 5. Electromotive Force and Peltier Effect. It is now necessary to account for the energy dissipated in the cell, other than that dissipated in accordance with Joule’s Law. This dissipation of energy, denoted by —-T is obviously due to oF or a reversible generation of heat; this Dene so, we see that if the current through the cell be revers —the energy which the rev ersing dynamo needs to expend ‘will be less or greater than the mechanical equivalent of the heat absorbed in the reversed chemical actions, according as the cell absorbs or evolves heat reversibly in its direct action. Now we know one such class of reversible heat actions in the circuit, viz. :—thermoelectric actions at the various junctions of dissimilar substances ; and we note at once that the mathematical form taken by a thermoelectric e. m. f. is identical with that of the ter For if «x denote the thermoelectric e. m.f. in a circuit consisting of two substances whose junctions are maintained at different temperatures, we know that II, the coefticient of the Peltier effect at either junction, i the temperature of the junction considered. Now there are several such junctions in any voltaic cireuit ; if then we denote by & (II) the sum of their Peltier effects we know a priort that 5k < ff eee SS (iM To assume off hand that —T ss is equal to } (If) amounts to asserting the absence of any source of reversible generation of heat other than the Peltier effects; an assumption we have no right to make—though it often was made—without experimental ce This bee been supplied by Jahn* and Gill, who independently measured the Peltier effects at the bounding surfaces * Wied. Ann. xxxiv, p. 755; 1, p. 189. The second paper corrects some errors in the first. 7 Wied. Ann. x], p. 115. THERMODYNAMICS OF THE VOLTAIC CELL. TF in different cells ; they find that for all the cases which they have examined the equation dE 5 T holds good within the limits of experimental error. Hence we obtain = > (i) Bees Ue oq an equation which Jahn* has applied to the determination of heats of combustion. These investigations of Jahn and Gill cover between them such a wide range of chemical actions as to warrant us in regarding equation (D)—provisionally at least—as generally applicable. + PR yt ax, uD) 6. Llectromotive Force and Dissociation. In a communication addressed to the Electrolysis Committee of the British Association,{ Willard Gibbs expresses the relation between e. m. f. and eke of formation in a different form. Denoting by T, the “temperature of transformation” —z.e., the temperature at which the chemical action which gives rise to the current would go on indiscriminately in either directions—Gibbs goes on to assume that the cell may be treated as a case of Carnot’s cycle,|| and from this assumption he easily deduces— E=H. =e’ (E) where H has the same signification as in (C) and (D). This equation is of great practical importance, inasmuch as if any two of the quantities E, H, and T, be known the third can be determined by applying it. Cohen‘) has verified it through- out in several cases, and has made it the basis of an electrical method of determining transformation temperatures, which gives results in very close agreement with those obtained by other methods, where such are applicable. WVan’t Hoff, Cohen, and Bredig** in a joint memoir combine the equation of Gibbs with that of Helmholtz and compare the results with experiment, thus verifying both at once. * Wied. Ann. xxxvii, p. 408. 7 This equation was indeed assumed by Lodge even before Jahn’s work had rendered the assumpticn justifiable. See B. A. Report, 1887, p. 340. t B. A. Rep. 1886, p. 888. See also a criticism by Prof. Lodge, B. A. Rep. 1887, p. 340 ; and Prof. Gibbs's reply, B. A. Rep. 1888, p. 343. § The lowest temperature of complete dissociation of a chemical compound is a special case of a transformation temperature. || Whether or no this assumption is in general justifiable seems to be a little doubtful ; and, so far, Gibbs’ proof may be regarded as open to question. His result however appears, as far as experiments have conducted us up to the present, to be quite correct. J] Zeitsch. fiir Phys. Chem. xiv, pps. 53, 535; Cohen attributes the relation to Van’t Hoff, but Gibbs’ investigation preceded Van ’t Hoff’s. ** Zeitsch. fiir phys. Chem. xvi, p. 453. 78 RESEARCH COMMITTEES. 7. Summary of Expressions for Electromotive Force. We have now the following expressions for the relation between the e. m. f. of a cell and various thermodynamic quantities :— 3 SE E=— 5 (—Ts) =—37 re a) SE su oe es B+3@)=—> =H an The practical utility of the expressions (C), (D), and (E) has been already indicated ; that of (B) is due to the fact that = is sometimes calculable when nothing can be directly determined with regard to ¢ and its differential coefficients. 8. Electromotive Lorce and Free Energy. Helmholtz has calculated the variation of free energy due to the passage of the current in two important cases, and compared the results with experiment. (2) Liquid cells. At the surface of contact of two solutions, of the same electro- lyte but of unequal strengths, an e. m. f. is set up ; if the circuit be closed by means of nonpolarisable electrodes a current will flow, and will go on flowing with gradually diminishing intensity until the concentrations become equalised ; in this way work may be obtained from the arrangement. The liquid cell thus con- stituted is reversible ; for the passage of a current through it in the opposite direction will set up a difference of concentration. In this particular case, however, the results are complicated by the Peltier effects ; Helmholtz eliminated these by employing two calomel cells,* similar in all respects save that the solutions of zine chloride contained in them were of different strengths ; coupling these so as to oppose each other, the resulting e. m. f. is the same as that of a liquid cell without Peltier eftects—since every kind of junction is traversed in both directionst—a ‘ simple liquid cell” as it may be termed; the only sources or sinks of ‘energy being (a) the solution of zine chloride in the weaker cell, (4) its passage out of solution in the stronger. * The calomcl cell is arranged thus— Za | Zn Cl, | Hg, Cl, | H: + The inequality in the concentration of the zine chloride solutions does not give rise to any difficulty, as experimenters agree in affirming that the Peltier effects at the boundary of electrolytic solutions are (@) small, (0) independent of the concentration. The insoluble character of the calomel also helps in the same direction. THERMODYNAMICS OF THE YOLTAIC CELL. 79 Now suppose a quantity dq of electricity pass thrcugh the cells, during which process an amount ds of the salt is dissolved in the weaker solution, and passes out of solution in the stronger ; then if « denote the electrochemical equivalent of the salt—z.e., the é : ds amount dissolved per unit current — then — = dq. € Hence in accordance with what has gone before—equation (B)— éF oF =—e aot Saas ive + The quantity ee cannot be directly calculated, but we may e determine it indirectly as follows :— If a quantity of water dw be evaporated from the weaker solution and condensed into the stronger, the work done is = = dw. Now oF can be calculated from a knowledge of the w w maximum pressures of aqueous vapour above the solutions—this calculation is given later—if then we can determine the relation éF and —— we can deduce the value of the former, and s bw consequently the e. m. f. of the liquid cell. between ~ The required relation is obtained as follows :—- Let us divide F into two parts, F, and F,, belonging respectively to the weaker and stronger solutions. ee ee oF, bw ow ow Let w and s denote the masses of water and salt in the weaker solution. w ; : Put — = i; and let f, denote the work done in separating 8 unit mass of the solution into water and salt -Fi=Wws)\fi=HesU +f If we vary w by evaporation or condensation, keeping s constant, we have CO ee } oh Se [a+)f | ine ae, [G4tDA] 80 RESEARCH COMMITTEES. If on the other hand we vary s by abstraction or addition of salt, keeping w constant, we obtain Ont 5 Sha +i) fits (A+ fh], = (140) fra > (1 + 2) fil. SS Ajay Se os G=—h = [d+OA] = hw (8) We must now determine oF, as a function of h. In the first bw place we observe that ih oF, ie where p denotes the vapour pressure and v the corresponding specific volume. Then, as Helmholtz has shown in the second of the memoirs above referred to, we may evaluate this integral as follows :— First, let the amount dw evaporate from pure water under saturation pressure P and specific volume V; this does an amount of work =P.V. dw. The vapour is then expanded—out of contact with water—till it attains the specific volume 7, and saturation pressure p,, of the vapour overlying the solution; this does a further amount of Vn work = dw Wf p. dv. V Finally the vapour is compressed in contact with the solution under constant pressure p, until it condenses. This absorbs work = 7,,. %,. dw. ony ow Vn =—PYV =i. p.dv + pny V or, by partial integration 6 F, A 2 C7; ae if .0 ap. 350 vee (7) We can now determine an expression for the e. m. f. in terms of calculable quantities. THERMODYNAMICS OF THE VOLTAIC CELL. 81 v, and p areall functions of h, we may differentiate equation (7) with respect to h, and we get a i. 5 p Sloe) ae OR by (6) , : api ERA typ eaereyy oe h=h peor = Bienes aie 8s h=oo? Similarly, if we denote the ratio of water to salt in the second solution by k, we may show that— — dF, cee dh. és h=ceo” SF SF, 3F a ae : — — 2)\— ees B= ee = —e(= re kt ea ee We now have to evaluate the integral in equation (F). For moderate temperatures the expression may be simplified, since the density of saturated vapours is small at such temperatures, even for pure water ; we may therefore assume that the aqueous vapour obeys the laws of a perfect gas—an assumption which Regnault has shown to hold good so long as the saturation density is small. We have, therefore, Ee Viceoek Ve pe TM i t where the capital letters refer to saturated vapour overlying pure water, the small ones to that above a solution. Hence equation (I) transforms into meee eo 5, = oe ie Helmholtz determined an rane formula expressing the relation between p and h/ for zine chloride solutions, evaluated the integral by its means, and deduced the values of E at O° C. for pairs of solutions of various strengths; the calculated values agreed very closely with those subsequently obtained by experiment. * The analysis as given here is considerably altered from that in Helmholtz’s memoir, to which Raynes has justly taken exception. (See ‘‘Physical Memoirs” of the Phy sical Society, Vol. I, list of errata.) The final result is, however, the same in both cases. F 82 RESEARCH COMMITTEES. In an earlier memoir Helmholtz* had discussed the e. m. f. of liquid cells from a different point of view. Taking such a cell as Cu | Cu SO, dil | Cu SO, strong | Cu he showed that the e. m. f. could be deduced thermcdynamically from the vapour pressures, the electrcchemical equivalent of the salt, and Hittorf’s migration constant. If we suppose 1 equivalent of the salt to be dissolved in a quantity , of water in one solution, and in w, in the other, and if » denote the migration constant, Helmholtz finds Pa E = fiw. C2 ioldpe .o2 |) eee) DP For a moderate range of concentraticns the following relaticn holds good— b Pp = = w where 6 is constant. In such cases (8) reduces to w —— BO Nae (lee aE) LOC eer W, P The accuracy of the calculation of e. m. f.’s by this formula was confirmed experimentally by J. Mosert; but, as Helmholtz himself pointed out, the introduction into the theory of migration constants—which are not known with any great accuracy §—is a source of weakness in the method as far as the verification of the thermodynamic theory is concerned, for which purpose he gives the preference to the experiments with opposed cells. This mode of investigation has however been applied by Moser || to the more accurate determination of migration constants, from measurements of e. m. f., vapour pressure, and concentration ; but very little has so far been done in this way, though it would seem to open up a promising line of research. (>) The relation between the e. m. f. required for the decom- position of water and the pressure of the evolved gases. In his third memoir on the “Thermodynamics of Chemical Processes” Helmholtz treats this case at great length, obtaining expressions for the free energies of water and of detonating gas, and deducing the e. m. f. of agas-battery. All his results contain, however, an arbitrary constant, so that only differences are of any practical use; the calculations of e. m. f. possessing individually * Monatsb. d. Akad. der Wiss., Berlin, 1877; Wied. Ann. iii, p. 201; Phil. Mag. [5], V., p. 348. } The analysis is not reproduced, being quite straightforward ; the notation in the results is altered to agree with that employed in the previous discussion. ¢ Wied. Ann. iii, p. 201. § We are indeed almost in the dark as to the relation between the migration constant and the concentration. || Sitzungsb. d. k, Akad. der Wiss. Wien, Bd. xcii. Abth. ii, p. 652. THERMODYNAMICS OF THE VOLTAIC CELL. 83 only a theoretical value—if that. The net result of the discussion is a determination of the effect of pressure on the e. m. f. of a Grove’s gas-battery ; as Helmholtz’s analysis is very cumbrous, and as this is merely a special case of the problem discussed in section 10—-where the whole question is shown to be susceptible of very simple treatment—only the results are given here. Let E, = e. m. f. under pressure p, of the mixed gases. ” EK, = e. m. f. ” P2 ” ” = P, + po. 3 where ~ sS S ~] Pr = partial pressure due to hydrogen. | - . oxygen. Let a,, a, denote the atomic weights of hydrogen and oxygen. » Un » Specific volumes % re » € = electrochemical equivalent of water. ee ie _— Po Vo » R= ;R, => th, t Then Helmholtz finds B,—E,=10~%e. T{ Ry = tog eae “be, a (G) 20, a, FD Tern In a fourth memoir* Helmholtz compares this Cane with the results of his own experiments. The agreement is, to all appear- ance, satisfactory ; but is in reality illusory, being due to an error in computation. He shows that the formula simplifies into 5x10 —7 x 000009319 x Tx R, x log, (”") Pi BK, — E, — 0-018868 log. (7) L and gives as the result of the calculation, when p,=10 mm. of mercury, p,= 742 mm., EK, — E,=0°1305. This agrees fairly well with his experiments; but it is not correctly calculated. If we substitute the values of the logarithms and work out the result we obtain— E, — E,=0:0813, which is not in agreement with Helmholtz’s observations, but agrees well, as we shall tind in section 10, with the much more extended researches of Gilbault. * Sitzungsb. d. Akad. der Wiss., Berlin, 1887, p. 749 ; ‘‘ Physical Memoirs” of the Physical Society of “London, Vol. i, p. 98. D = RESEARCH COMMITTEES. Free Energy and Polarisation. In an interesting memoir, Jahn and Schinrock* have investi- gated the polarisation set up during the electrolysis of a solution between platinum electrodes, from the point of view of changes of free energy. They write down the terms which include the changes of intrinsic energy and entropy due to every transforma- tion which goes on, both at the anode and at the kathode, and also in the body of the solution—owing to ionisation—and thus obtain, in the simplest and most direct manner possible, an expression for the change of the free energy of the system, in terms of the changes both of its intrinsic energy and of the entropies of its constituents. As the first attempt to apply the laws of thermodynamics to the modern theory of electrolysis the paper has great value ; the theoretical conclusions advanced in it are, moreover, confirmed by experiment. The results may be summed up as follows :— (1.) The maximum polarisation for all salts formed from heavy metals and the radicles of strong oxyacids is the same. (2.) The polarisation of a cell containing a dilute oxyacid must be increased by increasing the external pressure ; moreover it has the same value for all oxyacids, whether strong or weak, at the same pressure. (3.) The maximum polarisation in an oxyacid cell is inde- pendent of the concentration of the acid solution. (4.) The maximum polarisation in an alkaline solution is identical with that in an oxyacid solution. (5.) The maximum polarisation in a dilute salt solution will always exceed that in the corresponding acid; the difference between the two being equal to the change of free energy brought about by the dissociation of water into hydrogen and hydroxyl ions. 10. Relation between Electromotive Force and External Pressure. Let the action of a cell result in the performance of external work, not only in the circuit in accordance with Joule’s Law, but also in changing its own volume against external pressure during the passage “of the current. If no other work is done we may write equation (2)—of eae a eae iL fi 6U 8U d dT ——.dv-+H.d dv o=nisy +98 ots +E.dg+p where p and v denote the ale pressure} and the volume of the cell respectively. ¥* Zeitsch. ftir phys. Chem., xvi, p. 45. + Whether it be due to electrolytic gas or anything else. THERMODYNAMICS OF THE YVOLTAIC CELL. 85 Hence we have T.dpb—dU =E.dq+p.dv. Subtract d (pv) from both sides ; we obtain T.d¢dB—d U —d (pv) = E. dq—v. dp or, for constant temperature d(U—T q+ pv)* = —E.dq + v. dp. Since the left-hand member of this equation is a perfect differential, the right-hand member is also a perfect differential; hence we obtain at once dv — (= p q const. =(s)p const,” °°" + (9) From this equation we see that (1.) If the volume of a cell is altered by the passage of a current through it, the e. m. f. is a function of the external pressure. (2.) The e. m. f. increases with the pressure if the volume of the cell diminishes when it generates a current ; and the e. m. f. diminishes as the pressure rises if the volume of the cell increases while the cell generates a current. These laws were demonstrated—though by somewhat less direct reasoning than that employed here—by Duhem.; They were ae awards made the subject of an extended investigation by Gilbault,{ whose valuable memoir has hitherto received far less eeition eke it deserves. In accordance with Faraday’s law equation (9) becomes, for constant pressure, Sv _ Hy—Y ‘ Saaiesia (7-P-) where v, = initial volume of cell v,=final 5 g =quantity of electrification which has traversed it Hence gq —=— 4 — v,. a) P This equation is easily integrated for solids and liquids, seeing that in them v, and v, are sensibly independent of the pressure ; the integration is equally easy for gas-cells, provided we assume Boyle’s law to hold good throughout the range of pressure employed. We may therefore write for solids and liquids, Bp Ey, ==) en eee oD) * The function U—T g + p v is termed by Duhem the ‘thermodynamic potential at constant pressure.” + Duhem ; ‘‘ Le Potential Thermodynamique et ses Applications,” p. 117. t Ann. de la Fac. des Sci. de Toulouse, Vol. V, p. A5; C.R, 1891, p. 465. 86 RESEARCH COMMITTEES. For gas-batteries, putting V=volume at one atmosphere pressure of one electrochemical equivalent of gas, we obtain EB, :2+ B, =sV. dog: sy, eae Wea a CRS) Gilbault submitted equations (H) and (K) to the test of experiment for a large number of cells, and over a range of pressure from | to 500 atmospheres; and found a very satisfactory agreement between the calculated and observed changes of e. m. f. The change produced in the e. m. f. of a Daniell’s cell by applying a pressure of 100 atmospheres is about the hundreth part of that produced in Grove’s gas-battery ; it is, however, quite measurable, and the results agree with theory equally well in both cases. Small outstanding differences are ascribed by Gilbault, in the case of solids and liquids, to secondary chemical actions, which— though not fully investigated—were definitely shown to occur at high pressures ; similar discrepancies in the case of gases are ascribed partly to the cause abovementioned, partly to the failure of Boyle’s Law.* APPENDIX. Ir seems only fair to point out that several of the results here exhibited as deductions from the laws of thermodynamics can be obtained by totally different methods, some of which may fairly claim a degree of generality little, if at all, inferior to that possessed by the methods of thermo- dynamics. Thus the relation between thee. m. f. of a gas-cell and the external pressure has been deduced by J. J. Thomson+ directly from the Lagrangian function without subsidiary assumptions, thus proving it to be amenable to strictly dynamical reasoning. Again, by combining with the principle of least action the assumption—which has much to recommend it—that ‘‘the portion of the energy of a system which contains the temperature as a factor is essentially kinetic,’ Thomson has deducedt an expression practically identical with equation (C), 2.e., with Helmholtz’s law. It must, however, be admitted that, in view of the assumption which it contains, this part of his investigation cannot Jay claim to the same strictly dynamical character as the other. Finally it may be mentioned that Nernst’s theory of electromotive force leads directly to Helmholtz’s law§ ; but Nernst’s theory lacks the generality possessed by those founded either on dynamical or thermodynamical considerations. * The e. m. f. of a gas-cell is equal and opposite to the counter-electromotive force of polarisation in a water-voltameter at the same pressure; hence the relation between the e. m. f. needed to decompose water and the pressure is given by equation (K). Substituting the known value of V this becomes dy E, — E, = 0°018868 loge G y 0 which is identical with the result obtained by Helmholtz’s calculations. Gilbault verified this expression over a tolerably wide range of pressures. } ‘‘ Applications of Dynamics to Physics and Chemistry,” p. 86. t ‘‘ Applications of Dynamics to Physics and Chemistry,” p. 98. § See Ostwald, ‘‘ Lehrbuch der allgemeinen Chemie,” vol. ii, pt. i, p. 859. eal MINERAL WATERS OF AUSTRALASIA. Q7 No. 3.—ON THE COMPOSITION AND PROPERTIES OF THE MINERAL WATERS OF AUSTRALASIA. Report of the Committee, consisting of Professor A. Liversidge, F.R.S., Mr. W. Skey, F.C.S., and Mr. G. Gray, F.CS. (Secretary). REPORT. In the following Report, the composition only of the mineral waters of Australasia is dealt with. Analyses have been collected from all available sources, and the results arranged in geographi- cally alphabetical order under the names of the respective colonies. The list is necessarily incomplete, and the information given in some cases is of a fragmentary character. Considerable work yet requires to be done in the classification of the waters, and in gathering information regarding their therapeutic qualities. The results generally are expressed in grains per gallon, and for the purpose of so doing it has been found necessary to recal- culate them in some cases. With regard to the New Zealand waters, the labour of collecting results has been much reduced by a free use of the information given in the official Year Book, 1896, which contains an article by Sir James Hector on the subject. The thanks of the Committee are due to those gentlemen who assisted by furnishing particulars relating to waters coming under their notice. NEW ZEALAND. Abbotsford, Otago.—W. Skey. XVIIth Colonial Museum and Laboratory Report, 1881-2, p. 54. Acid chalybeate water.—Total solids, 304:01 grs. per gal.; sulphuric acid, 191-87. Contains considerable quantity of ferrous oxide and a little ferric oxide in combination with sulphuric acid, also free sulphuric acid ; deposits basic peroxide of iron compound on boiling. Akitio, Wellington.—W. Skey. Transactions, New Zealand Institute, vol. X, p. 447. Chalybeate water.—Total solids, 37°65 grs. per gal.; lime, 13°14 ; soda, with a little potash, 4°68.; magnesia, 2°32 ; iron and alumina, ‘93 ; carbonic acid combined, 9°57 ; sulphuric acid, 1:02 ; chlorine, 1°84; silica, 4:15; charged with free carbonic acid. Valuable as a tonic ; similar to the waters of Pyrmont (Waldeck), and Recoaro (Venetia). 88 RESEARCH COMMITTEES. Amberley, Canterbury.—A. W. Bickerton. New Zealand Offcial Year Book, 1896, p. 434. Chalybeate water.—Total solids, 37°6 grs. per gal. ; volatile, 8:8 ; chlorine, 10°5 ; carbonate of lime, 3°6 ; carbonate of magnesia, 2-2; iron protoxide, 2°3; soda, &c., 10-2. Contains a high pro- portion of organic matter. Auckland.—W. Skey. XVth Colonial Museum and Laboratory Report, 1879-80, p. 43. Alkaline water.—Total solids, 116-78 grs. per gal.; sodic bi-car- bonate, 42°89 ; calcic bi-carbonate, 14:25 ; magnesia bi-carbonate, 45-15; sodic chloride, 3:81 ; aluminia oxide, ‘30 ; sedic sulphate, 04 ; silica, 10°31. Bay of Islands, Auckland.—W. Skey. Transactions, New Zea- land Institute, vol. X, 1877, p. £24. Acid, sulphuretted, and chalybeate, water.—Total solids, 134°6 grs. per gal. ; fixed alkalies, 41°66 ; protoxide of iron, 2:23; lime, 5:97 ; magnesia, 1:15; silica, 3:10; sulphuric acid, 13°60; hydro- chloric acid, 66°91. This water has a slight acid reaction and strong odour of sulphuretted hydrogen ; forms a deposit of sulphur and sulphates. Blind Bay Estate, Lake Grassmere.—W.Skey. XXIXth Colonial Museum and Laboratory Report, p. 20. Total solids, 5:82 grs. per gal, consisting of sodic chloride, calcic chloride, and sodic sulphate; contains also minute traces of iodine combined with magnesia. Cannibal Gorge, Reefton.—W. Skey. XXth Colonial Museum and Laboratory Report, p. 52. Sulphurettedand chalybeate water.—Total solids, 36°66. ; sodium chloride, 18-02; calcium sulphate, 5-44 ; sodium sulphate, 2°20 ; calcium sulphide, 2°81; magnesia sulphide, 1:26; carbonate of iron, ‘91; silica, 6:02; sulphuretted hydrogen is present to the extent of 6°91 grs. per gal. Dungree.—W. Skey. XVIth Colonial Museum and Laboratory Report, 1880-1, p. 47. A chlorinated saline water, said to be avoided by cattle and sheep.—Total solids 94:6 grs. per gal., mainly sodium chloride, with chlorides and sulphates of the alkaline earths, a small quantity of earthy carbonates, and a trace of magnesia iodide. Reaction distinctly alkaline. MINERAL WATERS OF AUSTRALASIA. 89 Gibson Station, Southland.—_W. Skey. Transactions, New Zealand Institute, vol. X, 1877, p. 448. Total solids, 26-0 grs. per gal. Fixed salts, 18°51, consisting of alkaline chlorides and carbonates, with considerable quantity of ferric salts. Volatile matter principally organic matter, 7:5 grs. per gal. This water is said to be a specific for diarrhcea, probably due to some astringent substance present in the organic matter. Great Barrier Island.—C. P. Winkelmann. Transactions, New Zealand Institute, vol. XTX, p. 3838. (1.) Sulphuretted water, held by the natives to be a specific for rheumatism ; acts internally as a mild aperient. Temperature, 186° F. (2.) Sulphuretted water, considered by natives to be specially useful in skin diseases. Temperature, 142° F. Hanmer Plains, Nelson.—J. von Haast. Transactions, New Zea- land Institute, vol. IIT, p. 293. Hector, Zbid, vol. III, p. 297. Skey, Jbid, vol. X, p. 447. Hector, New Zealand Official Year Book, 1896, p. 433. Sulphuretted and alkaline waters.—Ten springs, four cold and six thermal, with temperatures ranging from 83° to 140° F. The waters from the several springs are similar in composition. Total solids, 77°38 grs. per gal.; sodium chloride, 62:09 ; potassium chloride, -15 ; sodium sulphate, 7-48 ; sodium carbonate, 2°66 ; magnesium carbonate, 1°77 ; calcium carbonate, °55 ; ferrous carbonate, -05; silica, 2°63, with traces of iodine, lithum, and aluminium phosphate. Reaction strongly alkaline. The waters smell strongly of sulphuretted hydrogen, which is present to the extent of 2°19 grs. per gal. A sediment is formed consisting of silica and free sulphur. Large quantities of free and albuminoid ammonia are present, but the water is not injurious to drink, and, in many cases, has been found beneficial. When used for bathing purposes, the water is said to be useful in cases of rheumatism, sciatica, gout, cutaneous diseases, nervous affections, insomnia, chest complaints, and also for asthma (from Oct. to June only), and psoriaris (from Sept. to April only). Helensville—W. Skey. XXIIIrd Colonial Museum and Laboratory Report, p. 68. Chlorinated water.—Temperature, 140° F.; reaction very alkaline ; total solids, 129°37 grs. per gal.; sodium chloride, 109-19 ; calcium chloride, 5:42; potassium chloride, 1:02 ; calcium carbonate, 4:67 ; magnesium carbonate, 1:49; calcium sulphate, 1:03; alumina, -45; silica, 6:10, with traces of iron. oxides and magnesia iodide. 90 RESEARCH COMMITTEES. Hokianga.—J. A. Pond. Transactions, New Zealand Institute, vol. xz, p. B12: -— =~ Chlorinated siliceous water.—-Total solids, 2937°55 grs. per gal. ; sodium chloride, 2797°4; potassium chloride, 1:9; magnesium carbonate, 18°71; soluble silica, 49°56; organic matter, 51:11, with traces of lime, iron, and sulphuric anhydride. Kopuowhara Mahia.—W. Skey. . X VIIth Colonial Museum and Laboratory Report, p. 55; Jbid., x1xth, p. 39. Chlorinated water.—Total solids, 1241-65 gers. per gal. ; sodium chloride, 1027-6; potassium chloride, 2°99; calcium chloride, 177°82 ; calcium sulphate, 2°61; magnesium carbonate, 1°49 ; calcium carbonate, 3°71; aluminum chloride, 16°42; aluminum phosphate, -37; magnesium iodide, 2°98; silica, 5°60; ferric chloride traces ; total iodine, 2:02 grs. per gal. Kummerstein Whareama.—W. Skey. XX VIth Colonial Museum and Laboratory Report, p. 37. A chlorinated water of considerable strength, containing iodine in notable quantity. Makztu.—W. Skey. XXth Colonial Museum and Laboratory Report, p. 52. Acid water.—Total solids, 130°27 grs. per gal.; sulphuric acid (free), 77°11; sodium sulphate, 8-21 ; potassium sulphate, traces ; calcium sulphate, 5-42; magnesium sulphate, 1:39 ; alumina and iron oxide, 12°18; silica, 25-96. Masterton, Upper Tararu Road.—W. Skey. XX VIth Colonial Museum and Laboratory Report, p. 38. Sulphuretted chlorinated water.—Feeble alkaline reaction ; Total solids, 224:3 grs. per gal.; organic matter, 3:2; sulphu- retted hydrogen, 1-6. Motukaramu.—Spring near the River Mokau.—W. Skey. XXIInd Colonial Museum and Laboratory Report, p. 57. A chlorinated. water containing iodine; total solids, 844 grs. per gal. Motuhora (Whale Island), Bay of Plenty.—J. A. Pond. Trans- actions New Zealand Institute, vol. x1, p. 512. Acid alum water.—Temperature, 198° F.; Total solids, 250°3 grs. per gal. ; sodium sulphate, 17:60; calcium sulphate, 7:52 ; magnesium sulphate, 5-00; aluminium sulphate, 48-48 ; ferrous sulphate, 9°38 ; sulphuric acid (free), 138-32 ; silica, 24:0. MINERAL WATERS OF AUSTRALASIA, - OF Mahuranga, Auckland.—J. Hector. Transactions New Zealand Institute, vol. 1, p. 70, W. Skey ; Jbid. vol. x, p. 424. Chlorinated saline waters, reported as a specific for rheuma- tism. (a) Cold spring temperature, 110° F. Total solids, 74 grs. per gal.; chlorine, 22:4; sulphuric acid, 8°80; calcium oxide, 5:2 ; magnesium oxide, 92; potassium oxide, 3:20; silica, 3-20; sodium oxide and carbonic acid, 20°40 (undetermined). (6) Hotspring temperature, 140 F. Total solids, 140-4 ; sodium chloride, 85:2 ; calcium chloride, 16°8 ; magnesium chloride, 22:0 ; silica, 3°60; with trace of potash, carbonic acid, and sulphuric acid. (c) Hot spring temperature, 141°6. ‘Total solids, 141°6 grs. per gal., apparently of the same composition as (0). Makaraka, Poverty Bay.—W. Skey. Colonial Museum and Laboratory Report XXI, p. 52. Chalybeate water from artesian well.—Total solids, 61:77 grs. per gal. ; calcium chloride, 26°88 ; sodium chloride, 10°87 ; mag- nesium chloride, 4°41 ; sodium sulphate, 5:22 ; calcium carbonate, 3°14 ; carbonate and chloride of iron, 7:24 ; silica, 4°01. Becomes cloudy and deposits ferruginous sediment on standing. Nukaka, Hawkes’ Bay.—H. Hill. Transactions, New Zealand Institute, vol. XX VII, p. 478. A chlorinated saline water, containing iodine. Temperature, 97°—116° F. Said to be a specific for rheumatism, lumbago, &e. Analysis (G. Gray) unpublished. Total solids, 1,852°9 grs. per gal.; sodium chloride, 1,196-3 ; potassium chloride, 11:19; ferric chloride, 10:5; calcium chloride, 462-0 ; magnesium chloride, 26°6 ; silica, 19-6. Napier, East coast of.—W. Skey. XXVIIIth Colonial Museum and Laboratory Report, p. 23. Chlorinated water ; feeble alkaline reaction. Total solids, 336 grs. per gal. ; principally sodium chloride, with small quantities of lime and sulphuric acid ; iodine present in notable quantity. Napier, McLean's Run.—W. Skey. IXth Colonial Museum and Laboratory Report, p. 25. Chlorinated alkaline water ; reaction slightly alkaline. Total solids, 445:51 grs. per ga!.; sodium chloride, 392°59 ; potassium 92 RESEARCILE COMMITTEES. chloride, 4:44 ; sodium sulphate, 1:26 ; sodium carbonate, 18°60 ; magnesium carbonate, 15°83; calcium carbonate, 3:96 ; carbonate of iron, 2°38; silica, 6°41. Contains both iodine and bromine. Ohaeawai, Auckland.—J. Hector. New Zealand Official Year Book, 1896, p. 426. Acid aluminous water.—Temperature 60°—116° F. Total solids, 134-4 ; deposits sulphur and alum on cooling. Mercury in form of vapour is given off, which deposits cinnakar and metallic mercury. Ohura.—W. Skey. XXth Colonial Museum and Laboratory Report, p. 52. Chlorinated chalybeate water.—Total solids, 578-66 grs. per gal. ; sodium chloride, 495-32 ; potassium chloride, 4°20; calcium chloride, 55:96; magnesium chloride, 1:84; magnesium iodide, 62 ; calcium sulphate, 2:04 ; ferrous carbonate, 10°21 ; magnesium carbonate, 5°40 ; silica, 5-07. Onekiniki.rW. Skey. XXIXth Colonial Museum and Laboratory Report, p. 19. Chlorinated saline water.—Total solids, 198°95 grs. per gal. ; sodium chloride (with a little potassium chloride), 155-78 ; magnesium chloride, 1:14; magnesium iodide, traces; sodium sulphate, 14:26; calcium sulphate, 3°47; sodium carbonate, 12-76; calcium carbonate, 1:19; iron and alumina, :21 ; silica, 10:14 ; sulphuretted hydrogen, -34 grs. per gal. Onetapu Desert, Auckland (Wangaehu River)—W. Skey. Transactions, New Zealand Institute, vol. 1, p. 28; Jbid., vol. x, p. 424. Alum water, with acid reaction.—Total solids, 456 grs. per gal., mainly potash alum, and magnesium, and ferrous chlorides. Otira Gorge.—G. Gray. Transactions, New Zealand Institute, vol. xxil, p. 495. Sulphuretted and siliceous water.—Specific gravity at 60° F. 100022 ; temperature, 87° F. (air, 61° F.) ; Total solids, 12-46 ers. per gal. ; potassium sulphate, 33; sodium sulphate, 3-99 ; sodium chloride, -40 ; sodium sulphide, *45 ; sodium silicate, 4°26 ; calcium silicate, °34; calcium carbonate, 1:14; magnesium carbonate, -29; alumina, -21 ; free silica anhydride, 1:05 ; iodine, bromine, and lithium absent. MINERAL WATERS OF AUSTRALASIA. 93 Pahua, Wairarapa E.—W. Skey. Transactions, New Zealand Institute, vol. x, p. 444; XIIth Colonial Museum and Laboratory Report, p. 45. Chlorinated saline water, containing free iodine ; reaction distinctly alkaline.—Total solids, 1,474-09 grs. per gal. ; sodium chloride, 1,305°32 ; potassium chloride, ‘50 ; magnesium chloride, 34:96 ; calcium chloride, 120-88 ; magnesium iodide, -58 ; mag- nesium bromide, traces ; calcium sulphate, 3:02 ; aluminium phosphate, *64; calcium phosphate ; -43 ; calcium bi-carbonate, 6°45 ; silica, 1-69 ; iodine free, 1°59. A very characteristic water from the amount of free iodine it contains. Pakaututu, Napier.—W. Skey. XXIXth Colonial Museum and Laboratory Report, p. 19. Two waters, containing respectively 20°12 and 14:3 grs. per gal. of sodium chloride, with sulphuretted hydrogen and iodine in sensible quantities. Papawhaniki, near Gisborne.—W. Skey. XXIVth Colonial Museum and Laboratory Report, p. 41. A chlorinated saline water, feeble alkaline reaction. Total solids, 764:5 grs. per gal., principally sodium chloride ; iodine, 3°69 grs. per gal. Puriri, Hikutaia, Auckland.—W. Skey. Transactions, New Zea- land Institute, vol. x, p. 425. XVth Colonial Museum and Laboratory Report, p. 45. Alkaline water.—Specific gravity, 1-006; total solids, 537-11 grs. per gal.; sodium chloride, 21:93; sodium sulphate, -94 ; potassium sulphate, 4:93; calcium bi-carbonate, 28-50 ; magnesium bi-carbonate, 25°62; sodium bi-carbonate, 452°39; silica, 2°77. Traces of magnesium iodide, ferrous carbonate, and lithia. This water is highly sxrated with carbonic acid, and effervesces strongly when escaping from the spring. A second analysis, 1880, showed but little change in the nature of the salts present, but that the water had become more concen- trated. Total solids, 825-10 grs. per gal. Rotorua District.—J. Hector. New Zealand Official Year Book, 1896, p. 429. 3 Moroteteaesea-e ss sseeceee eee a2 | 7-49| .. | .. | «— | 2a ROGO ULNA PIG Be epee yaietelel-ceteia) aletalatcietotaieletelateinietetere Stag SON Merve D435) eters ale fa SPAS sa Ue ect erete terete alee = Felon vel oka eee ole ishorete etaaetetote state 136-156 |10°31| .. ae nc ac 5 PaO UMN CO Ub Ul ereyetetoieketeteleverenersteleleletelekeleterelashetevaretsrtep) 90-108 7:06 Te Kawoanga, Cameron’s ...0... 20s g ces olan oe vinie 109-15 | 44°54] .. “6 as G6 Br 50 (PAITNKALTOrh aye atetepets cro roveueloveteloteretensrevors 204 | 29°14) .. a “3 fe Bc (OM ong en cece canceOUC OT aC GDOr 80-109 | 23°71] .. Be ete « a MINERAL WATERS OF AUSTRALASIA. . 101 the Rotorua District. Analyst, W. Skey, F.C.S. S ¢ o = a o Sy = =, ret 3 3 3 3 o = = e <4 |% = S$ 1g ; 3 5 & = | © am 1d = | = = zs Re} = 3 qj >) ie = eS i| Ss & 5 S g 5) a 5 aS} 1S) : Ss = 53 Sd o = S AS | = | = nD 5) S a 2 = iS 5 = eI S| < D | z Soe a ue} =I i) mM 3 3 = > oO a | >< eI = FI 3 g = & ae | @ B =) |S a | o = | a = = = a 5 | 3 a Ba |8 o | o 5 3 = iS = 3 5p | cS) 5p Ss Bi | 2 Mra i o|l|sizl/sesialis g a | 3 3 3 | 8 & | & nm Ay R a oa) ie) = f=} ‘e) a i a |o 9312} 3°65|18'41| .. sn _ x ca oi oy ae = 96°77 | 2°98] 2°16 4:99] 7:49] 8:23] .. es es AJ sa of ens mM .: 56°45 | 3°61 4 30°32] 6:14/17°61| .. o eff si ie 2 mess ne .. | 18258] 3:02] _. 811} 6°76|12-01| .. a ws 2 a an eee ee ais 59°50 | trace 17°86 | 7°40|10-10] .. = =< a = 3 ee ne 2) 85°67 | 5:6 13°95 | 2°62/18°15| .. re Ee ik re P i he e 54-94 12°48] 3°82] 4:12] .. rt ah ae oe : 3 Bs . 29°51 | °98 77) 1:°63/12°40] .. i re Ms * FS eae ys ms 48°44 | 5°74 |18°02] 86/1008) .. rr a3 ee zy 33 ae e AJ 44°52 | 1:01 meeo 881817) 6s) .. Pe a * mY Boks ou 2 56-00 Ee -. | 18-21} 3°41] 69-43 | trace| 31°02] 4:24] 1:09] 2-41]! .. Sy Weasels.) ese mie. 114-90) .. (60:44) .. | 8-38] .. 32) 142) .. | 1:04] 91:98] 5:52 -. | 8:29] 4:69| 93-46] trace} 6°41] 2°89] 1:02) 210] .. te ieareo ||| 5. cd a as 66°44 29:27 672] 31) 113-27 | 2-21 - i 1-24 | 53°61 16°32] 1°61] 114 39 87-78 ‘as 2 a 1-46 | 66°34 | trace| 2°08] 3°16] -76 ull se .. | 104:54 Meee | 853| 47) 6-25| .. | .. | asi! -z 99] .. | .. | 32°45 es | «. | 18°42] 2°08] 45-70] .. | 2°57] -34] -12 “Bib a 79°85 | .. ve ce | -- | 5°55] 97/2904] .. | 32712] 1:62] -40 LN So x 78°33 «- | 592] 9:92] 1-67 | 12-04 62 | 5:22] 1:28] 80°51 | 4:42] .- Chlorides. “ee | 684) 18°02] 1-71} 46-42] .. mn by a 4:92] 2°66] 1°47] 110-48 | 4:84] .. mmeeres|iss6| -77| .. | .. | .. | .c | .. 293 | 2-04| 1°62) 6019] 319] .. COMMITTEES. RESEARCH 102 92° AE PSP ae GS Ie 28 Neha || 2 oe | er) Wie] 2289 Ge | Giz |) Teka |] Chak OF-F0L | 9-420] °° 96. | 26: | 19. | TS. 25 SCOR al TOT ean ROGaDe | GOsLe | Oren Soak : ** | 76.201 |66-ST| "°° | 6F- -* | Tp. |a0%tq | O13 ; 26:97 |Sl.8T| “7 | SLL-| OFT |: ** |eovay | O12 86-88 |#9-2E] "7° | FS | 9-9 | 69. | 99. | 6-2 GON OL:cele seen | oak |66-6 | 90:9" || Gee BP PL0ST | 99-6 | “°° | 20-8 | 68.8 | 80-T |. 90va9 ee lH rgers Wyetye|| SSCS learn || Wa |e? Ihe |) 1a OG PGeiicr-O0 |) wale \NPGeh \06-Gi |atvaen|| (08: a 11-86 |79-9 | °°" | @9.T | F9.¢ | 00813) LP. oo CHO |S || 8202 |) HS || Ge ** |aoesq | 10.3 mo | ascent) | POP | eYhIe || Grol! a0vd} | L0- © | GES axa) POSS | TEBE |) Gees #3: || 86-0 erate Wise} || 222 I Gyaie I aay | Saks. |encROL || WSS Te Gers W2c-9) | see2 ||| £853: 166-9) ||| F850 ||66- : CHOOT OPM |eee | Ten Wl O0st |nOscn| One es : C8-86T | 12-9 69. | SFT | TLh |-OLT | ° 22 I Sian fall “7 1 69. | ZE-T | 84-9 | 20819 8-9 | GZ.9LT |¥0.26| ST-FOT | ** oD s 86-8 | 26-ZFL | 12-61] 17-81 y : : mM € | ee Sa Sa a es s =o io) EP Em ba Bo ° & on jaf, is Q n See Fo 5B ° 2 2. & =y Q x ee > ts) (S}, 2 S) [= % Q 8, Eg : 2 Sh a Fs a: g, 5 2 | ¢ S 5 Bele B| 2 oO a 5 g : "S'0'd ‘Aoxg MM “asd oUy 90-3 Sg rage) I XebIe || US: |) edie Poe eoh orp es OPYLEAL “TYMVIVAL | 2 26-8 “* * 6F-1 18.CF oa oe WIvaIyS oe 13 18-9 . . 2-1 OF.99 Orr WHO DMO sien ‘ON “e “ 03 99-9 : 16-1 | 19-69 OAT 86)" °° "2 T‘ON aornog 61 &9- 90-2 | 92.98 | °° |°'*' Sundgcerj-ea, = 81 68-1, 90vl} €0-FL seee Z ‘ON oe “ee LL €6- aovty | 10.8 “TON Ie ‘O'V ‘tyryediem | OT CE.Z | To, SOL |unreemtnrtsseet esters: remoyoy | oT 20-6 66 3.| 90-62L | 96E fo ‘ON a iat 69-6 ; oo Osi? | BIE |feoweecares T ‘ON a0In0g &L 79-8 . . 90vA4 19-1 90L ee . yoRurng “ ZL 68-8 : -* | 90vI9 | IG. 1 ia) Glee ipa Sumdg une sé IL me : 90014 | 91-6 Quy aaltsugeiek weatys Ploo se OL 19-G BD 9081} | 28. OG eae Fee $ UOSIOY GoW ‘s Aayory 6 66-F . 90814 | $6.9 (oy Sh ean] eee ee OR elovoy ‘ayIyvunydO 8 ZO0-T oD vovry | 10-T race |feoan00 qeiq uo Suudg = ** 1 TL. : 96-2 | 69-T9T | SOL |" *" “oroyryautyQ 9 FET : ** | 70.€ | 92-88L | Z6T |" * UOIpNeD soy g TL. : ** | $Le | 18-68L | OST [°° °° 27 9SAN S,MorD ‘oulyeny | GP.9 S 90vIy €8. CLL 3 ng haa T9VCM AFT AL ‘TOMBALE AL € €8-91 Ogee |G2-6h Ole |ESO:ca) (6S eee Toye MOTI X af j 91-92 | gg | 60-1 | 69-ST| 19-3 | 99-69 | EE | °°" '* 40qVMA MOVIL “Vaeyojoy | T ine n @ |) 2 a Q a 4 Ei Z|) 2 2, [2h 2 g gh Wee g 8 g g 3 Bea a a: a a @ o 50 © @ o co) 2 ° es || So 2 2 a . He ee mm | eee Oo a ms m sutadg pue sy1[v00'T NC ce} 3 a 2, So , ry for 5 93 Q p> i— 2 = 2 5 rt B = a i= B n i=} _ 5 = jor oS 5 iS t5 ‘uoy[es aod sureas ur possoadxo sz[nsoy ‘suyeg sAopory (1) stoye Ay [erourpy, odney— TT 103 MINERAL WATERS OF AUSTRALASIA. a 88-896 | $9.16] ~° | 29-6 | TFT ne ens “1 16-6 iy aa €L-8L | 02. | TI- a ble : “ 166-8 | 90v1 IL-S9L | 68-8T FI-L | OF-Z 62-9 | PL. GL-L6G | 10-ST}| “° | 09-L | 98-1 f i PLS | Ga. 3 GO0-GOL | SF-9T “ 10L-L | $61 . 06-9 | 90814 ‘ ILSSL | 8-21 “ |9L6 | 04-1 : 4 FG-FL | 9OVAY : OF-83 TLL 1 i Zz “| 08-6 | 20-6 | 90814 “* | PL-F1S | 6L-9T “ | TLL | 66-1 ia ~ | TPL | 9014 06-116 | $9-ST “ | %8-T | TL-6 . 16-9 | 62. ce 66-68 | 10-6 PLS | FET ‘ e2 “* | T9-TL | 62-4 a G8-F& | £0-8 69-6 | OF-T ES 96-T | #0- | i GZ-09 | TT-02 | Z9- ~ | SF-IL | L9-€L | 66-6 a SP-SP | $5.1 | OF- F . “| @8-GT | 18-8 | £38 : mM id z, 3S re) i (e) ie) ° bd =] ue] EACy e| fe) |S |e| | eles) & | = | ee oI Qe, 2 ° ° ° Bo | 3 & | Bo | + aS 5 ae Ee Ey WES || eS ° Bo | on 3. gS (Pl n > ee ba) > Fr me Be 8 i = g Q 4) — e 6 > | 99 a. = a] © g & “ 2 i = a & g i er 5 ow 5 a g is} E = & is S E o> Uh sical zap ils al allies = ¢ a 5 a ; a VIN JO Opltolqo “UINTSOUS st" "* Foog ousedurveyy BG FLSL| LL-OL| 02-961 | GIG €1 19.1. |%9 | 80-1T | S4L |°*** ousedareyD 9194rT -: aL PELL | 61-9 | ZOOZLE | OL | [00d 491g oP IL 10-11 | 1Z-FL | 00-041 | OIG jtaskapavan “ Or #9-6 | 2-9 | 12-61L | Z1Z |laskayH yvo1y aps YyNOYG se 6 69-G | PL-OL| SP-OLL | USL |°*°*** YuUld eS i 8 TL. | o0v.14] 18.¢ 00g |" a7“ y IL9 | $6.9 | 46-TLT | O9T |°°**** tear apis YON 9 FLL | 20-4 | 09-F4L | GIZ j4oskay AoW, twuva4g Me G FL-6 | 99814} 61-6 80) Teall amos “** TeYOUIYOMTY “Tove AL | F 16-2 | 99V1}| 10-8 |POL-26, "°° TeyNY VULZLIY “AOATY OPVYLCAA | & 62. PLE “+ |s19y@ 4 Jo Surqoayy os 3 “+ | 90019] 28. “UlvaIg ULL ‘OMIeSuoy, tuvzyyoy | T (@) Q ie} 4 Se) 8 a | 8 3 | 3 ov a oy @ o o o sy 2 = <3 a! 5 ay p 3 ‘Satidg puv Aq1[/eo0'T ‘ON = | & = rj Pall seek) eee |B D =] 8 Z. 8 4 5 ‘SO ‘A079 mM sdyeuy ‘aoT[ed aed sureas ut possoadxo sqpnsoy ‘Troyer AA (Z) Stay AA [esourpY Oduey— TTT RESEARCI COMMITTEES. 104 i LEST | LT-6T}] “* | THT | IL-6 i a “ |6Lé | 19- OL-§ | 91-4 | &1-4 | 16-601 66L Re ee, ae cam OX aa AO) fis c6-1F§ | OL-SL| “" | PLT | 20-8 af sid “116-5 | L8- GG.G | GL-FL| SF-eT | LL-18% 402 voesresssess tevureqrcuey | ST ** | 84-978 | GL-6L] ~° | 10-6 | ST-€ i % “* 106-8 | IL-T | 16-9 | T€-11 | FL-ST | €8-626 861 cones’ BlBY MNCL, | FL £5 99-626 | TT-PL}| °° | 66-T | 71-6 “e “2 “* | 66-6 | T6- 6L-F | L1-FL | 1G-FL | TF. L716 Ost ae = HORE ERICE ICSI ae 8F-F9S | 98-41) °° | $46 | PLP x *2 “* | 18:6 | 90-T | 60-9 | 9T-8T | 66-6 | F9-1T0E 891 Batata Nor re “TRJONLL | GL Pd 88-L1T | 09-6T] °° | O8-L | G6. os a “* | TLL | 90819) 0-6 | TLL | F¥- | OT-L8 98 soeeeeeeee ss“ OVaTCYLMA | TT ia 8G-E8T |F6-L | ~“" | 16-6 | 19.6 i. he “* | $8.6 | 90819 66.6 | 91-46 | 28-9 | 99-661 OIL sores ss THLOMOM VAT | OT aD F8.1LF | 6-66] °° | 89-E | LT. “ a “* 116-T | #9-6 | 6L% | 96-ST | 91-61 | 02-768 | GLZ-806 "* BBUlOg 0} OL0YOIOY OF, | 6 a FP-LOV | OL-FG} ~° | 6-8 | 66-7 i: 35 “| 66-6 | 86-6 | 29-2 | 61-91 | LP-IL| LL-968 GST soreeesess Surg runmed | 8 ¥ 00-196 | 61-Fo| “" | 11-6 | TL es + “" 129.6 | 00U14) T9-T | 60-9 | 64-6 | 4-106 OFT sreseesess Suridg odney | 4 - 10096 | L4T-86} “" | 88-6 | 09-6 me e “* | TPG | 00VI9 | LF-T | TL9 | 9T-OL} 29.006 GOL ee eee ATI STa 19 19 “us I6-FFS | 18-F2| ~° | 81-6 | 18-8 =e ig “* 108-F | 1436 | 96-F | 08-ET | ZT-8T | FL-89F | G6L-9ST sores Sundg surdyugod | g ee O&-cEh | PLLE] ~* | 66-T | 19.6 - a “ 1ALS | 69-6 | 96-6 | 46-FL | 66-FL | 16-128 GéL ee ete Sutids TEAL |p cs GLGEE | OTST} “* | LL-6 | 78-6 on a “170-6 | 0-8 | FL3 | 86-8 | 66.6 | 9.186 est ce Van thee lal ire Se 68-1F§ | SEAT] °° | €2-6 | 09.4 es ee “| PLP | 8L-S | FOL | 4T-OL |} TL-OL | FL-062 6 soe OOD | ee 60-298 | 22-8T} “" | 62-8 | 18-6 fa “* | 96-F | 1-9 | 10-L | STIL | G6-FL] LT. 108 OFT TO SEEHEEER TIE > ‘ i gezlo2 ary S a g Se ZS ES&S EIS aoe ge £8 3. go. 283. £28) 2.2 Bo8 ‘Buyudg pure Ag1e007T On g s/he) * | 89 |e SiB. S12 SisBa\s SF e/PB 2 5é e|2 s|§ &) PF & |S ‘s'og ‘AoxS (AA “Qs4reuy ‘uoT[vs rod sureis ut possoadxo sqpnsoy nuveyoy, (g) stoyV AA [erouTy, Odney— AT 105 MINERAL WATERS OF AUSTRALASTA. _ 66 ie FL-E1 a on 1G-F O<<4 0 O™ seceee “cc RID Sic SSeéa5 S gca> COL “<“ mS Sgo | 99-9 : ) “ce SAo2o, | 98-9 BS) EO IG Toles? es: ® pee ee pices teenie IL-9 mn ey To Ps Bt Wee (=a 00-9 i. - eel : EFSS5 | FF9 FoBerae | 0918 th 2.» ; 6s oY OB, 10-2 a Bah s PI-L SEBS ‘ ® S28 OL-9 »: eee | eee te or Zone 12-4 - BEeas | Stl Oo — —_ 2 a coos 9G. 4 se0GL], ‘apIxO “BOIL uody “ *“SooUVL], “CUILUNL YW 3L- TST 10-1 | 26-1 91-8 gS DES Peccyteelt ZL-ZLT 98-6 L3- £9. 36-8 phe alli ier Il: Te =) 9L- T&S 19€ | 16-9 |9Lz | 2o8]| Ler | 09-F1F $9126 | Gre | FIL 986 | BES | 19-3h | OLF0F 79-108 | €L-€ | IT-9 98-16 | 52.8 | L9.0P | 12.088 16-008 | 66:36 | 21S | 96.20 ae ORL? 18-088 PP-196 | 99-6 | TLS | I-02 “| 69.68 | 0-088 61-912 18-3 | £96 | 6L-6I ss | 5%.G8 =| 09-8F8 LI-108 19-3 | 6-6 | 91-23 ee rani? 19-8L¢ L6-1SF IGF | Led 16-26 | 96-T | 1-99 | 92-8L¢ 03: FFF PEF | OF-L 40-68 | 9 3. | SI-L9 SI-F9¢ GL.66b | 666 | SLL | PLSe | PEE | €99 | Lesiy Sickie: sco | ste | 169 | c69¢ | FES | 189 | sbs69 6F-9FS | FIG | 29-b | OL6T | BE.S | tare | ZS-118 61-6aF 03-F | F3L 38-38 & | 1¢-09 LI- 149 63-93F 1S | StL 19.38 | 06-1 | ¢F-09 | 92.68¢ 9¢-19F | 98:9 | LLOL | a8-8e | S41 | 39:09 | 66-98¢ “epog ‘wBISOUSL]y | “auu'y “epog | uinissvjog| “uinIpog “spr[og jo JO jo jo jo Jo [RIVULYAT ayeuogIvy | o}vUOgALH| oyvuUOGIVH)} oyvyd[ng | opmolyO | opuolyD [PIOL "S'O'd ‘Aes (MA “yshTeuy "S19]VM [VIOULP VYOLY 9T—' A PIC Si proo | LT opanAo OI 6&T GT col ial OGL él 88 GL 88 IL 96 OL GIL 6 601 8 98 L FO 9 OOT G cb P aa & GIL G cOL I ‘a “duioy, | ‘on ‘uo][ed sod suread ut possordxo sqynsoxy 106 RESEARCH COMMITTEES. Results expressed in grains per gallon. oO on ben f VI.—Waters from N. Territory. ak aie ne ac es nS aS Name of Spring. Z z Z 2 52 Z 2 a3 53 Z 2 n a a n is) A 4 Stranyways Springs .......... 329°71 7°30 16°88 18°09 18°55 Bopeechee Springs ...........- 97°06 3°05 13°34 Mount Hamilton Spring......... 223°77 4°20 37°81 Coward Bore Hole ............ 172°24 2°90 19°63 Coward' Sprinter ern see 15805 3°20 20°59 HranCisiS prin opie ee er eee 290°11 6°10 “59 36°17 | 24°54 iBlanchelCupieere.ciee seta seer 215-28 4:10 15°47 Anna Creek Bore Hole ........ 286°93 4°80 27 35°02 22°61 NAO SNS! Seconencnosooodc 59°16 1°60 2°38 /Nxcooilitneh ESsopancouopocHoes 56°54 8°49 | 14°53 18°32 8°20 Indulkananc «5 | trace Codnadatta Bore .............. 79°92 dc 20°05 10°55 Hamilton Creek Bore .... ....- 72°17 18-04 9°05 Coward Bore, 1 mile from No. 4. 168741 18°76 aK Alton Downs, Herbert River, gaa) *5D 1455) 25 18°45 5 MINERAL WATERS South Australia. Sodium Carbonate. Sodium Bi- carbonate. 41°21 Calcium Carbonate. bo On = oO 5°25 OF AUSTRALASIA. Analyst, G. Magnesium Carbonate. 4°43 9°90 10°29 9°48 12°11 3°96 19 2°03 171 8°40 13°61 20°36 5°12 4:28 1°54 Carbonate. Tron 10°03 Sodium Silicate. Calcium Silicate. 3°59 Magnesium Silicate. 1°59 °25 Aluminium Silicate. 107 A. Goyder, F.C.S. o oO 3 £2 3A psa 416°53 178-28 wee | 308-47 252°74 239-22 373,61 282°40 366°33 125°73 114 | 130-27 1:00 83°23 3°49 "85 | 157-22 2°58 1°20 | 180'26 1:70 | 116°88 1°34 67 | 317°56 “30 “21 |1,767°84 ‘49 | 374°92 03 35 | 207-21 06 “60 | 163°50 03 1°00 18°65 = 104°38 “05 PALA G L “15 ‘90 | 366°15 trace 112 | 429-47 27 | 114 | 201-67 10 18 | 256°87 “05 12 110°51 69°44 125°59 11279 245°50 06 1°35 191°12 COMMITTEES, RESEARCH 108 O-LEFE =| FEF | LF | 4-81 “| £L-891| °* | 0-988 | 0-48 a | 0-6LL6 CO ae eh Sao poce any “L6ST ‘out poyuA qyNog snss01/) 0-200G | 0-GOT | 99823 | 0.4F 90 Ore PS NOLES | = O.OL |e08aa|(0.98ET “C68T ‘erpred[ooy * aul Ivgq wapjor) 0.981e am 107g - “ lg.g6t| °° logezlo.g9r| °° |Ozlae fun Hi treeseeteeeteretentes QagT ‘or[1008]8 y ‘OUT cats AN alpavespoog 0-SOTE oe ee USGS ae oa “1 0-06F | 0-FST | ° “| 0: 66F% 968T ‘erj1ooayeyy * SUTIN SOUNBAT 0-668 | 99%17| 0.0L POSSE O:907 | Se 0825). O:GOR) Ty as O:0G09is tases cine Settee NorTa0O gun ‘east ‘s URUUv FY ‘e10g] qUATUUAAO®) 0-LE8p |0-GE | 0.84 | 0-L2 ee OsLe “* 10-012] °° |0:49¢]0-86 |0-SPLE |° oI[1003Tey ‘cERT OT 8 UBUU FT G-GL6E | €-CEL| 1-90 | 9-96 “". | &-06 “| 0-988 | 6-S6 ae “1 O-9L68 [es aTtoosyey “L687 ‘ouryy pepuoyxa TH UMorq s,uvuuey 0-062 | 0-08G|0-FT | 0.cF Oke “10-016 | * | 0-68T | 9949 | 0.0696 ueeesess QrTOOS [VY “96ST ‘ayeqS TUM TH UWMoig s,ueuuep 0-08LE | G-C61|F-2S | OF-ST| L191 }0-GLT} ** | 0-828) °" so WON asker Pe seuss QT 0052 ‘LOST ‘OUI TIT UMorg s.weuuezT 0:090F | 0-86 pit “5 - 0-297} *" |0-099|) °° wh | 09819) O.0108 [es ordoostey ‘C6ST ‘OUTTT [ITH UMorg s,uvuursy 8 iS) ice 29 = Q nm z Q == pe) nm o Be | fF epee Seis) =a FE | 3B | € | $8 B. E 25 “ase Be. i=} =) 2 4. B a’. S 5 # a § 2 # e& a) fe E S “AqITCOO'TT + o < ch = S " 5 = 5 g = ‘Cs “a ‘uoT[vs aod sureas ut passoadxo sqpnsoyy ‘Ud ‘dieg ‘g Wf) sppPey-ploy urryeajsny ysoA Worz stoye A, Jo stsk[eUy—TTA GLACIAL BOULDERS—CENTRAL AUSTRALIA, 109 No. 4.—ON THE OCCURRENCE OF GLACIAL BOULDERS AT YELLOW CLIFF, CROWN POINT STATION, FINKE VALLEY, CENTRAL AUSTRALIA. Third Report of the Committee, consisting of Captain Hutton, F.R.S., Mr. R. L. Jack, F.G.S., F.R.G.S., Professor Tate, F.G.S., Mr. R. M. Johnston, F.G.S., Mr. G. Sweet, F.G.S., Mr. J. Stirling, Mr. W. Howchin, F.G.S., Mr. E. G. Hogg, M.A., Mr. E. J. Dunn, F.G.S., Mr. A. Montgomery, M.A., F.G.S., Mr. E. F. Pittman, Assoc. R.S.M., and Professor David, B.A., F.G.S. (Secretary). EVIDENCES OF GLACIAL ACTION IN CENTRAL AUSTRALIA, I. Introduction. Tue evidences herein described are supplied by a great number of pebbles unmistakably grooved and striated by ice, several of which are now exhibited. The locality where the pebbles occur, Yellow Cliff, near Crown Point, in the Valley of the Finke, Central Australia, was visited by Professor Tate, in Company with Professor Baldwin Spencer, on the occasion of the Horn Expedition in 1894. They both observed then that some of the pebbles showed evidence of stri- ation, though Professor Tate considered the evidence obtained at the time insufficient to justify the conclusion that the striation was ascribable to ice action, and consequently did not refer to this in the account of the locality published in the Geological Report of the Horn Expedition. Mr. J. A. Watt, M.A., B.Sc., also visited the locality, on the same expedition, and made the following entry in his field-book, which he has allowed us to copy :— “ Before reaching Crown Point a peculiar structure is seen in the small white and yellow kaolinised sandstone hills, the structure simulating contortion, and probably due to settling of partially consolidated material owing to the melting of ice.” The locality is described as follows by Professor Tate and Mr. Waitt* :— “Yellow Cliff, at the S.E. bend of the Finke, near Crown Point Head Station, which is about 50 feet high, consists o yellow and buff sandstone, strongly false-bedded near the top, intersected by vertical joints filled with limonite, enclosing pebbles of Desert Sandstone and quartzite ranging from small gravel to 24 by 44 inches, occasionally 2 feet cube, the pebbles are some- * Rep. Horn Scientific Expedition to Central Australia. Part III. Geology and Botany, p. 72. London and Melbourne, March, 1896. 110 : RESEARCH COMMITTEES. what rounded and smoothed, many of them are standing on edge. At the east end of this bluff the sandstone is very tumultuously bedded, and in its basal part contains a conglomerate of about 4 feet thick.” This formation is grouped (op. cit.) under the head of Tertiary river gravels. Professor Baldwin Spencer, on the occasion of his second expe- dition to Central Australa during 1896, being anxious to obtain further evidence bearing on the possible glacial origin of the pebbles, revisited the locality i in company with Mr. P. M. Byrne, and together they succeeded in obtaining important evidence which places ‘the glacial origin of the striz beyond dispute. They dis- covered at Yellow Cliffa large number of pebbles glacially grooved and striated, of which five specimens brought down and submitted by Professor Spencer and Mr. Byrne to the Glacial Committee are now exhibited. II, Mode of Occurrence of the Glacial Pebbles. The largest is 6 inches in diameter ; they are all of quartzite, and of a reddish brown to brownish-grey colour. Four are rounded, and one sub-angular; three of them have lost their original upper surfaces through exfoliation. All exhibit glacial striz more or less distinctly on their bottoms and sides. The smallest pebble has been ground down to a flat surface, and has been strongly striated and grooved by ice action. As regards their mode of occurrence, it is stated that the pebbles, from ie inch to 1 foot in diameter, occur in a layer from 2 to 3 feet thick, imbedded in a sandy matrix overlying the soft, yellowish grey sandstone, already referred to in the foregoing description. Their level above the sea is about 1,000 feet. The general appearance of Yellow Cliff is shown on the accompanying plate. The gla- ciated pebbles may have weathered out of the sandy matrix in which they now occur. ITI. Stratigraphical Relations. At Crown Point, in the same neighbourhood, Professor Spencer and: Mire P.M. Byrne observed a formation which, judged on lithological grounds only (as no fossils were found), appeared to be identical with that under lying the stratum containing the glacial pebbles. Whereas, however, the “ tumultuously bedded” sand- stone at Yellow Cliff has only a general low angle of dip of from 2° to 3°, it dips at Crown Point (if the above provisional lithological correlation be correct) at 73°. At Crown Point the steeply-dipping friable sandstone is unconformably capped by Desert Sandstone. Mr. J. A. Watt states that he considers that the friable sandstone, showing the tumultuous bedding at Yellow Cliff, is conformable to the Desert Sandstone, the age of the Desert Sandstone (/. Tate and FLV1d *S3198Sd GSALVIOVID—AATIVA AMNI4 SSITQ MOTIZA ‘DIJDAJSNY JDAJUGD Ul UOLIY Jo1Iv/H UO aaz{IMUog ayy JO Jogay ‘8681 ‘IIA ION ‘OS ‘AGY ‘OSSY NvIsvIvuLsAY GLACIAL BOULDERS—CENTRAL AUSTRALIA. Lia Watt) being Supra-Cretaceous, and f. R. L. Jack and R. Etheridge, junior, Upper Cretaceous. The solution of this question as to the supposed identity of the friable sandstone of Yellow Cliff with that unconformably capped by Desert Sandstone at Crown Point is of considerable importance as bearing on the probable geological age of the glaciation. No glaciated pebbles were observed by Professor Spencer or Mr. Byrne in the friable sandstone either at Yellow Cliff or Crown Point, though some of its lower beds contain a number of well-rolled quartz “pebbles an inch or so in diameter, nor do they think that the glacial pebbles were derived from a disintegration of the friable sandstones. Tf, therefore, the friable sandstone which at Yellow Cliff immediately underlies the 2 feet to 3 feet bed (out of which the glacial pebbles have weathered) is identical with the steeply-dipping sandstone uncon- formably capped by desert sandstone at Crown Point, then the next formation below the glacial stratum at Yellow Cliff is Pre- PUL Uses (Tate and Watt), or Pre-Upper-Cretaceous (Jack and Etheridge), and judged by the degree of induration of the beds is not likely to be as old as Carbonifer ous, though it may possibly date back to the Permo-Carboniferous. The date of glaciation of the pebbles, according to this view, may be carried even as far back as the Permo- Carboniferous. If, however, the view be adopted, that the Desert Sandstone and the friable kaolin sandstone be conformable to one another, it is possible, though of course it by no means follows, that the age of the latter is Cretaceous. The fact, however, must be mentioned that in some parts of Australia, especially in the western district of New South Wales, as, for example, in the Gulgong and Home Rule District, near Mudgee, the Permo-Carboniferous strata are not only conformable with the Pliocene gold gravels, but also very like lithologically, so that the gold-miners have some difficulty at times in ascertaining in which “of the two formations their gold-workings are situated. In other parts, how- ever, of New South Wales, as in the Murrurundi district, there is a marked unconformity between the Tertiary and Permo-Car- boniferous rocks. Possibly analogous conditions may obtain in Central Australia, at Yellow Cliff and at Crown Point respectively, and the friable kaolin sandstone at one point may be discordant, and at another point concordant, with the Desert Sandstone. In South Australia, also, the strata which contain the glaciated boulders, fringing the coast, southerly and south east from Ade- laide, at Hallet’s Cove, Inman Valley, Port Victor, and Cape Jervis, are in places only slightly indurated, and there is no marked unconformability between them and the overlying marine Miocene beds, and yet there are reasonable grounds for believing g 1412 RESEARCH COMMITTEES. that these glacial beds may be of Permo-Carboniferous age. Stratigraphical and lithological evidence, therefore, is not opposed to the theory that the friable kaolin sandstone may date back to Permo-Carboniferous time. The age, however, of the kaolin sandstone may not be by any means synchronous with that of the overlying glacial deposit. Professor Spencer and Mr. Byrne are of opinion that the glaciated pebbles had not weathered out of the kaolin sandstone, and they were unable to find any glaciated pebbles im sitw in the kaolin sandstone. There may not, however, be any considerable difference in the age of the two deposits, and, in that case, they may both be referable to some late portion of the Paleeozoic or some portion of the Mesozoic era.* IV. Geographical Position. Yellow Cliff is on the right side of the Valley of the Finke, or Larapinta, as the aborigines call it. It is situated in longitude 134° 5’ E., and latitude 26° S. With the exception, therefore, of the very doubtful glacial localities in Brazil, it is nearer the Equator than any other locality in the Southern Hemisphere where undoubted traces of Pre-Tertiary glaciation have hitherto been observed. In Southern Africa, the northernmost point to which evidences of Pre-Tertiary glaciation have been traced, is, as far as we are aware, the junction of the Vaal and Orange Rivers, and Weltevreden’s Farm, near the same locality. At the latter spot, Mr. E. J. Dunn, formerly Government Geologist of Cape Colony, discovered glacial conglomerates, underlying sand- stones containing Gangamopteris, and therefore referable to the Dwyka Conglomerates, and at the former locality, in 1885, he found a striated pavement. This is in latitude 29° 8., and longi- tude about 23° 40’ E. The age of this glaciation is Permo-Carboniferous. Presumptive evidence of ice action far north in Australia, in Pre-Tertiary time, has previously been adduced, from the Bowen River Coal field, of Queensland, in latitude 23° §., longitude _ about 149° E.t * Speaking for himself, the secretary is inclined to think that the association of glaciated pebbles with the ‘ tumultuously-bedded ” kaolin sandstones is, in itself, evidence in favour of the Permo-Carboniferous age of the glaciation. Nevertheless, the time which has elapsed since Middle and Late Mesozoic, and even early Tertiary time, is so vast as to render it impossible probably now to restore the past physical features of Central Australia as they were in Jurassic, Cretaceous, or Eocene time. The possibility of the existence of inland ranges in Australia, at any of the above-mentioned periods, sufficiently high to form a gathering ground for glaciers, must not be excluded. He considers, however, that on the whole, evidence at present, slender as it is, is in favour of a Permo-Carboniferous age for these traces of glaciation in Central Australia. +Report on the Bowen River Coal-field, by Robert L. Jack, p. 7, paragraph 39. By authority : Brisbane, 1879.. Also Pres. Address to Geology Section, by T. W. Edgeworth David: Austr. Assoc. Adyt. Sci. Brisbane, 1895. Vol. v1, pp. 63-64. GLACIAL BOULDERS—CENTRAL AUSTRALTA. 1138 This evidence is in the form of erratics, up to 2 cubic feet in capacity, sporadically distributed, or occurring in groups, in the marine Permo-Carboniferous strata of the above coal-tield. As however, none of the blocks hitherto found, exhibit glacial strie, their glacial origin cannot, as yet, be said to have been demon- strated. Mr. Jack has suggested as a possible alternative expla- nation of the phenomena, that the blocks may have been entangled in roots of floating trees, and have been subsequently dropped from them. On the whole, however, the theory that they are ice- borne, appears to us to afford a far more satisfactory explanation. Mr. Jack states that in his middle, or marine, subdivision of the Bowen series, the remains of trees are neither numerous nor large (and this is the horizon to which the erratics belong), while in the Upper Bowen Series (freshwater), which may be correlated with the Newcastle Series of New South Wales, silicified tree trunks of very large dimensions (up to 3 feet in diameter, and over 40 feet long) are astonishingly numerous, and lie horizontally embedded in the sandstone, which is suggestive of their drift origin. The horizon of the drift timber, therefore, does not coincide with the horizon of the erratics, another fact in favour of the latter being ice-borne. In the Northern Hemisphere traces of glacial action have been met with even nearer the Equator than Crown Point or the Bowen River Coal-field. Near the village of Trai, in Southern India, striated and grooved rock pavements have been described by Fedden, in latitude 19° 53’ N., at an elevation of 900 feet above the sea. The Talchir boulder beds, in which erratics up to 30 tons in weight are embedded, extend to latitude 17° 20’ N. V. Summary. The discovery by Professor Spencer and Mr. P. M. Byrne, of undoubted glaciated pebbles at Yellow Cliff, may therefore throw important light on the extent Equatorwards of the carry of glaciated rocks, possibly in Permo-Carboniferous time, unless the glaciated blocks are the result of some local glaciation in Central Australia, at some later period. It presents another inviting tield of research among the many opened up by the Horn Scientific Expedition. More observations are now urgently needed to show the strati- graphical relationships of the glacial pebbles, particularly to the Desert Sandstone. The Glacial Committee desire to express their thanks to Professor Spencer and Mr. P. M. Byrne, for kindly placing their interesting collection and notes at the disposal of the Glacial Committee. 114 RESEARCH COMMITTEES. No. 5.—ON THE EVIDENCE OF GLACIAL ACTION IN THE PORT VICTOR AND INMAN VALLEY DIS- TRICTS, SOUTH AUSTRALIA. Fourth Report of the Preceding Committee. EVIDENCES OF GLACIATION IN THE INMAN VALLEY, YANKALILLA, AND CAPE JERVIS DISTRICTS. Physical Features. THE localities referred to in the present notes are comprised within the peninsula which forms the southern limits of the Mount Lofty Ranges. The area is roughly triangular in outline, with Port Victor and Normanville at the base and Cape Jervis at the apex, and is bounded on the sea line by Encounter Bay. Backstairs Passage, and the south-eastern portions of the Gulf St. Vincent. Between Port Victor and Normanville there is a stretch of rela- tively low land broken up into minor hills and valleys, bounded on the north and south by ranges of greater magnitude. This main valley is divided transversely by the Bald Hills, which cross the valley at two-thirds distance between Port Victor and Norman- ville, and forms a water-parting between the seas on either side. The Inman River takes its rise on the Bald Hills Watershed, about 15 miles west of Port Victor, and empties its waters into Encounter Bay. With its tributary, the Back Valley Creek, it drains an area of about 50 square miles. The flats bordering the river are of small extent, and the valley is occupied by undulating hills that rise 200 feet or more above the level of the stream. The Bungala River takes its rise on the western flanks of the Bald Hills, and after passing through the township of Yankalilla finds its outlet in the Gulf St. Vincent at Normanville, making a course of 6 miles in length. The main valley, including the country on both sides of the Bald Hills Watershed, gives a length of 22 miles by road, and a superficial area of a little over 100 square miles. The secondary ranges of the valley, consisting mainly of newer deposits, do not attain a height above sea level much exceeding 600 feet, whilst the average elevation of the enclosing primary rocks is from 800 feet to 1,000 feet. The highlands which define the northern and southern boundaries of the main valley consist of schistose and other metamorphic rocks, and, as measured on the map, are 6 miles apart at the lower end of the valley (where the valley is widest), but they converge on the western side, in the Hundred of Yankalilla, and at two points the valley is narrowed to about 2 miles in diameter. } GLACIAL ACTION—SOUTH AUSTRALIA. 115 The physical features of the country lying between Yankalilla and Cape Jervis can be best dealt with when the glacial evidences of this district are described. Glacial Features.—The Inman Valley. The Inman Valley holds the first position in the history of the discovery of proofs of former glaciation in Australia, and Mr. Alfred R. C. Selwyn, at that time Government Geologist of Victoria, had the honour of making this discovery. Whilst travelling through the Inman Valley in 1859, engaged on a cursory geological examination of the country under instructions from the South Australian Government, Mr. Selwyn was fortunate in observing a polished rock surface, which, to his practised eye, exhibited clear proofs of glacial action. In his official report he says: “At one point, in the bed of the Inman, I observed a smooth striated and grooved rock surface, presenting every indi- cation of glacial action. The bank of the creek showed a section of clay and coarse gravel, or drift, composed of fragments of all sizes, irregularly imbedded through the clay. The direction of the grooves and scratches is east and west, in parallel lines, or nearly at right angles to the strike of the rocks; and though they follow the course of the stream, I do not think that they could have been produced by the action of water, forcing pebbles and boulders detached from the drift, along the bed of the stream. This is the first und only instance of the kind I have met with in Australia, and it at once attracted my attention, strongly reminding me of the similar markings | had so frequently observed in the mountain valleys of North Wales.”* Whilst Selwyn made this striking discovery, he does not seem to have noted the cognate evidences of glaciation in the extensive deposits of drift, glaciated stones, and great erratics which form the chief geological features of the valley. In May, 1892, Mr. H. Y. L. Brown, Government Geologist, S.A., published an official “Geological Report upon a Shale Deposit in the Hundreds of Encounter Bay and Yankalilla,” in which he says: “This formation consists of a jointed shale, varying in colour from a bluish green to black, and interstratified with them there are undulatory beds of sandstone and quartzose sandstone, and occasionally limestone of irregular thickness. The upper portion of this shale, which in some places exhibits a concretionary structure, has become decomposed into clay, and contains water-worn pebbles and boulders of granite, quartzite, sandstone, ironstone, &e. Some of the boulders of granite are of great size, and in character resemble the granite of Victor Harbour. At one or two places on the Inman River there are * Geological Notes of a Journey in South Australia from Cape Jervis to Mount Serle, No. 20, p. 4. 116 RESEARCH COMMITTEES. beds of sandstone grit and boulder sandstone, and these beds rest on the primary rock (quartzite), from which they dip at angles varying from 10° to 15°. They appear to be interstratified with the shale. “This shale deposit seems to occupy a basin beneath the overlying Tertiary beds, and for that reason its extent cannot be ascertained by a mere surface examination. * * * Asa consequence of no fossiliferous remains having been so far met with, no evidences are given of the geological age of this deposit, but as it underlies Miocene Tertiary strata, it may be classed as probably belonging to the older Tertiary or to the Mesozoic rocks.” In relation to the surface geological features of the Inman Valley, Mr. Brown states further, ‘Large boulders of granite, sandstone, quartzite, quartz, &c., occur along the valley of the Inman River, as well as in other parts of the area, embedded in the clay-beds, and resting on the surface. The presence of these boulders in the position in which they are found can be accounted for only on the supposition that they have been transported from their original position by glacial action.” From the isolated position of this singular clay deposit, differing as it does from all other local rocks, and its uniformly dark colour, Mr. Brown suggested the possibility of its being coal- bearing, and during the three years, 1892-95, the Victor Harbour Coal Company tested it for this object. Three bores were put down in the Back Valley in a lineal direction a mile or two apart. No. 1 Bore reached a depth of 950 feet, and was stopped by jamming of tools before the bed-rock was reached. No. 2 Bore was also choked at a depth of 570 feet, and had to be abandoned. No. 3 Bore recorded a depth of 975 feet, the last 11 feet of which was supposed to be in bed-rock (primary). Particulars of this bore will be given on a later page. In 1895, in a paper read before the Royal Society, S.A., on ‘“‘ New facts bearing on the Glacial Features of Hallett’s Cove,* one of us anticipated that these thick mudstones of the Inman and associated valleys would prove to be of glacial origin, and in age synchronous with the glaciation of Hallett’ s Cove, There is now little doubt that this is actually the case. In March last Mr. W. Howchin, F.G.8., of the local Glacial Research Committee, together with Professor David (General Secretary of Research Committee), and Mr. C. C. Brittlebank, of Myrniong, Victoria, visited the Inman Valley and Norman- ville with the intention of investigating the glacial features of the neighbourhood, and more particularly bent on the re-discovery of the polished glacial pavement referred to by Selwyn in his 1859 report. Starting from Port Victor, the occurrence of large * Trans. Roy. Soc., S. Aus., Vol. XIX, p. 68. *AATIVA NVWN[ 'MOOY Si\NAM1ES ‘W'S UOloY ]D19D/9 UO aapjimulog fo JAogay “Il ALV1d ‘QE8I IIA TOA ‘OS ‘Ady ‘OSS NYISYIVuLShY GLACIAL ACTION—SOUTH AUSTRALIA. 117 erratics became conspicuously evident, both by the roadside and partly exposed in the cultivated ground on either side of the valley. The lower reaches of the Inman River are much silted, its waters flowing over a sandy bed, except where the stream has cut its way by a narrow gorge through a spur of the hills and flows between high per pendicular cliffs. A little past the seventh milepost from Port Victor, the party made for the river where a low exposure of the older rocks could be seen in outcrop, distant about 248 yards from the public road. This proved to be a very fine glaciated pavement, which we immediately concluded must be “Selw yn’s Rock.” The bed-rock is a very dense, dark-coloured siliceous quartzite, which at this point occupies the entire bed of the stream. It dips in a direction S. 55° E. at 26°. The principal polished face is on its northern, or left bank, gently sloping to the bed of the river, and in a position which must involve its submergence whenever the river is in flood. The exposed portions of the polished pavement measures over 20 feet in length and 6 feet in breadth. On the water side it has been broken and eroded by the river action, and to landward it has a cover of river silt several feet in height. By clearing away the silty bank, the polished surface was seen to underlie this cover for an unknown distance. The glaciated pavement is not only highly polished, but deeply grooved and striated. The strisw apparently belong to one system and follow a uniform direction, with a bearing of W. 93° N., which agrees with the general trend of the main valley. The grooves are broad rather. than deep, some of them measuring fully 2 inches in breadth (see pl. 2). A few yards higher up the stream a smaller polished surface is seen on the southern bank, where a washaway has exposed the bed-rock free from cover a few yards away from the stream. The strize here have the same general direction as on the larger polished face, which is diagonal to the course of the stream, their trend being W. 12° N. Within the limits of the current (as might be expected), the river-bed has been eroded to an extent that has destroyed all evidences of glacial action—the glaciated pavements, on either side of the stream, being above all but abnormal floods. It is also evident that at one time the polished rock has been covered by glacial drift as the inequalities in the floor have been filled with a par- ticularly compact sandstone, corresponding to the local arenaceous drift, only of harder texture. Samples 6 inches thick were taken from some of these depressions, and they are very suggestive of having been formed as a moraine profonde. The aneroid reading at this spot indicated a height of 200 feet above sea-level. If this be the particular glaciated rock discovered by Selwyn, it is evident that the bed of the stream has undergone some changes in the interval. His description of the superficial deposits 118 RESEARCH. COMMITTEES. of clay and stones resting on the polished rock agree very well with the local drift, whilst the face of rock discovered by the present writers was overlain by a bank of loose river silt. It is quite possible that the bank of glacial drift has been washed away and its place taken by more recent deposits, or otherwise the river silt may have been washed up against the face of drift and thus obscured it. No other examples of polished rock surfaces were observed by us within the limits of the Inman Valley. Close to this interesting spot, on the northern side of the stream, there is a ridge about 100 feet high which is chiefly of glacial origin. Large and very numerous erratics up to 12 ft. by 13 ft. by at least 3 ft., cover the sides of the hill, the larger number being granite. In places the huge blocks of granite are so closely heaped together that at first sight they were thought to form a natural outcrop. A careful examination, however, proved that this was not the case. Many of the large stones were polished and faceted. These have evidently been weathered out of an extensive bed of glacial drift which originally sub- merged the hill. Interesting sections of the drift are exposed in some of the lines of erosion cut in the hill sides by the mountain torrents. At this place it is an indurated sandstone thickly studded with erratics of all sizes and has a dip of 10° W.N.W. At 94 miles from Port Victor an excellent section of the Drift is seen in the bed of the stream, having a dip of 7° E.8.E., con- taining numerous boulders of large size. One example of Port Victor granite, which had been washed clear of the matrix, measured 7 ft. by 6 ft., whilst others, almost equally as large, were exposed im situ only partially separated from the drift in which they were originally buried. A quarter of a mile higher up the stream a good section of drift is seen on the north bank, consisting of two very distinct beds. The upper is a friable sand-rock carrying large boulders. This bed has probably, to some extent, been rearranged, as it is a softer stone than is usual with the drift of the locality, but the included stones are mostly heavily striated and give no evidence of river action. Subsequent to glaciation it is not unlikely that the upper drift at this point has slid or been washed down from the high ground on the northern banks. This boulder bed rests on a dark mudstone containing few stones. The undisturbed drift beds at this point gave the same dip as was found a little lower down the stream, viz., 7° E.S.E., and showed a face 30 feet in thickness. About 150 yards higher up the valley the drift again shows strongly in the bed of the stream as a white indurated sandstone with irregular bands of conglomerate. Dip 8. 35° E. at 18°. Here for some distance the bed of the river is almost choked with an immense number of large boulders ; some of these, where “AATIVA NVWN] OlLVHYNg "W'S ‘UOlIY Jo1IDIg UO aajpimumog fo JAogay V/1 FLY1d "BBSI IA TOA ‘OS ‘AGY ‘OOSSY NVISVIVULSNY GLACIAL ACTION—SOUTH AUSTRALIA. 119 protected, showed distinct evidences of glaciation. About 200 yards still higher up the valley, where the main road almost touches the stream, near the tenth milepost, a few very large granite boulders occur in the bed of the river, some of which have been drilled and blasted and the pieces utilised to protect the banks from erosion. One of these,a pear-shaped mass, closely resembles the Port Victor granites, and measures 11 ft. by 7 ft. by 41 ft. The effect of weathering is seen in a partial exfoliation of this large boulder, but in places it still retains the glacial polish and grooving. A photograph of this erratic was taken by Pro- fessor David. (Plate 3.) From the tenth milepost the bed of the river continues to be strewn with large travelled stones, chiefly granite ; one measured 8 ft. 6 in. by 5 ft. by 4 ft. 6 in. Another protruding from the glacial Drift on the north bank measured 10 ft. by 7 ft. by 6 ft. Another conspicuous example was of gneiss, giving a beautiful illustration of augen structure, whilst the largest transported stone seen in the bed of the river was observed a little west of the Inman Valley Bridge, near the post-office, and measured 12 feet by 8 feet. Nearer the source of the Inman the larger erratics are less common, but at intervals the river flows over a_ bluish-black glacial clay, or argillaceous sandstone, which is very soft, and, apparently, destitute of stones, except some angular fragments of decomposed shale, similar in colour and composition to the bed in which they are included. The Bald Hills, situated 15 miles from Port Victor, and 7 miles from Normanville, forms the watershed, as already stated, between either sea, and divides the valley into an eastern and western section. This transverse ridge is covered with a peculiar soil, which is very black and deep, such as might be looked for on low marshy ground, but very unusual on the crest of a range. This peculiarity attracted the attention of Selwyn, who says :— “‘T was unable to ascertain what rock it is that makes the rich black soil of the Bald Hills, but I imagine it to be due to the decomposition of the crystalline limestones, with the addition of some hornblendic and micaceous rocks.”* As there are no local limestones, and the bed-rock is a siliceous quartzite, it seems impossible that the dark soil is the product of the decomposition of the local rocks. It is more likely to have been derived from the dark-coloured glacial clay, which can be traced to the eastern flanks of the Bald Hills, and, doubtless, at one time covered their summits. This is made the more plausible as there are abundant evidences that the ice passed over the top of the Bald Hills at a height of 640 feet above sea-level. A good section of drift with * Op. cit. p. 4. 120 RESEARCH COMMITTEES. stones is seen in a cutting by the road-side, just over the western crest of the hill, whilst on the southern side of the road the steep water-worn gullies are full of erratics and good sections of glacial drift, a sitw with many ice-worn stones. Here also, near the sixth milepost from Normanville, in the upper waters of the Bungala River, two small faces of polished pavement were recognised in a narrow mountain torrent. The aneroid reading was 395 feet above sea-level, and the polished rock is a hard and dark-coloured siliceous quartzite, identical in character with the more important face in the Inman Valley. The two polished slabs were in the same watercourse at slightly different levels (about 20 feet), and on one of them is a conspicu- ous vein of white quartz that has been planed down to the same level as the quartzite matrix. The strike of the striz is E.24°S., and there is a continuous bed of glacial drift covering the rock between the polished faces. The gathering darkness prevented a close examination of the country between the Bald Hills and Normanyille, and the bed of the Bungala is much silted so as to obscure all but the most recent deposits. On the following morning, however, a flying visit was paid to the hills bordering the sea on the north side of Normanville, when striated stones were picked up on the heights with rearranged sandy material 200 feet above sea-level. THE BACK VALLEY. In a second visit to this neighbourhood, by one of us, observa- tions have been made over a much wider area than that already described. The Back Valley country runs parallel with the Inman Valley, from which it is separated by a high ridge that is continuous for about 6 miles. This dividing range was crossed by following a district road that joins the main road about 74 miles from Yankalilla, passing the house of Mr. Thomas May field, At an elevation of about 300 feet above the Inman a large _rounded boulder of granite can be seen in a paddeck on left- hand near to the fence. It measures 74 feet by 74 feet. Granitic boulders continue to be seen up to the crest of the hill, estimated to be 500 feet above the level of the Inman, and per haps 100 feet higher than the road which passes over the Bald Hills. Near the top of the hill there is a granite boulder 3 feet in diameter. After passing the crest of “the hill the ground falls away, and at about 100 feet less elevation the road passes along the summit of one of the secondary ranges of the Black Valley “with a trend S.S.E. and N.N.W. At the head of the road, near Mr. Marshall’s house, a road cutting extends for about 100 yards, exhibiting soft yellow sandstones, unstratified, but contorted. Strings ot dark-coloured argillaceous material run most irregularly through the stone, sometimes forming loops. No stones were actually GLACIAL ACTION—SOUTH AUSTRALIA. 121 seen embedded in the sandstone, but striated pebbles were picked up both on the natural surface of the ground as well as in the loose sand of the road cutting, having, to all appearances, been weathered out of the sandstone. With the road still descending towards the valley, at a short distance from the cutting just referred to, a second occurs of precisely similar features associated with glaciated stones, and at a further distance of a quarter of a mile a stony patch is exposed on the northern slopes of the hill in the adjoining paddock, many of the stones showing glacial features. We descended to the Back Valley Creek to find the bores put down in the neighbourhood by the Victor Harbour Coal Company, but failed to discover them. The country is cut up into high ridges and numerous narrow gullies, and densely covered with scrub. The bed of the creek is shallow and much silted, and only in two places was the yellow sandstone (? glacial drift) seen in outcrop, and these were in conspicuous patches in the bed of the creek. It is to be regretted that no experienced person seems to have examined the material taken from the bores referred to, and the only information available as to the strata passed through is contained in the log-book kept by the man in charge. The three bores seem to have closely resembled each other in the nature of the beds penetrated, and we subjoin particulars of No. 3 bore, which was the deepest of the three :— Nature of Strata. pices Ua ee ag ity aba tts ae SSUTELAC ER Cla Yarn ax sone ses cionacjorie Seieees Tesuctans oct Gahem ae seems 15 0 EW) Sra CMementere ssc eh ntce onsets tee Seno Cen ener co tedoerodes 5p) 0 70 O Sandstone rock ..c.ca).ccscess ees AN ROAD RE AA 0 8 70 8 Shaleswichelaverswon San claeeseentneneccecse tones nee 39 4 110 O SANG SHON CERO Keener. eats ae ee toners eee hor See 0 6 110 6 Halerandesandls svcowssrassccsnceeen teak dened saenone eae ace 19) (Gy anleo) 20 SIDING IS HOMIE) TROLC) Feng RRM neem tek rarer ees ae Oe ee 0 9 130 9 Slralevamdlsand’s 2.5 <2..cces0ec0 eee Reales Pid ee lee ee: 1983 150 O ANG SLOMeWOC eM M arcs e tank iadascnahhtes: Cate EEE 0 6 150 6 manduandy shal cacsnecsccssenciganescosse cael atch Soe mec GL Ges |) 212, 0 AMOS TOMEEOC Kags ate uas we ect oceieacion auton saree cee Renee (0) 214 O Sand and shale—nearly all sand... ................ a Suiast PAL 235 0 Solid shale ......... i BRO EREE REE RE Chee na dec n eee (207-0 955-0 Sand) 2... Ted att dad os tC OR AAR CREAT HOARE EO ER ae cotibabnobacee 45 0 300 O Slrall ever Gliese eae was sarersta eels aioste/e csr ae Glos seca See eee 6 O 306 0 Sandstone moc kamen eee cette at acactenceta sane ee eee 0 9 306 9 Sand and shale—nearly all sand ... ................600000- 193 3 500 0 Solid’ sand—almost'a sandstone .:............----<+ sees: 196 0 696 0 Sand and boulders, with occasional small bands of Conglomerate aa ecece.eaeeuassser res scsea serene eee 268 0 964 0 Bineshard, rock. (primary, )c.ccn.! oseesoscese ee ogee aeeeee LO 975 0 Bore stopped. 122 RESEARCH COMMITTEES. BALD HILLS AND YANKALILLA. Followed the crest of the Bald Hills on north side of the public road and observed granitic and other erratics scattered over the fields of Mr. J. R. Kelly, M.P., at Cornhill, and picked up strongly- glaciated quartz pebble near the source of the Inman, a little above the Bald Hills post-ottice. On the western slopes of the Bald Hills watershed, erratics are common, especially in the tributaries of the Bungala River. Near the fourth milepost from Yankalilla, 6 miles from Normanville, there is a conspicuous face of drift on Mr. Capper’s ground, seen from the road on the south bank of the creck near the house. The section is about 200 yards long by 15 feet high, and consists of soft, yellowish sandstone, studded with numerous erratics. By far the largest and most interesting exposure of the glacial beds of the neighbourhood i is seen in Wood’s Creek, about a mile from the centre of the township of Yankalilla, and a few hundred yards above the junction which the creek makes with the Bungala River. For many years this stone has been worked as “the Government quarry” for making and metalling the roads, the quarry face extending 150 yards laterally, and has exposed a thickness of stone of over 50 feet from the bed of the creek to the top of the quarry. The stone is a white, yellow, and grey sandstone, decomposing into loose sand near the surface, but, at depth, passes into a compact grit. The bedding is a little uncer- tain. On one side of the quarry, what appeared to be bedding planes with a rolling curvature dipped towards the creek at an angle of 20° N.N.W. The stone is conspicuously jointed both vertically and obliquely, and where compact can only be won by blasting. The bed is crowded with erratics of great variety, but on account of the intimate union between the included stones and the matrix, sometimes they can only be recognised by a close examination of the face. Granite (of Port Victor type) is the most common. One example of this kind was exposed on the quarry face that gave the measurement 18 in. x 10in. Others exhibited opalescent quartz as a constituent exactly corresponding to a variety found at Port Elliot. Amongst the erratics were also noticed mica schist, different coloured quartzites, quartz pebbles, crystals of orthoclase, &e. The granite and schists have undergone considerable decomposition, but most of the quartzites and quartz pebbles retain striking evidences of glaciation. The finer material consists of quartz sand, mostly rounded, strangely intermixed as to size, whilst the cementing agent is apparently a silicate resembling pipeclay, possibly the product of the grinding down of the orthoclase of the granitic rocks. The junction between the glacial beds and the older rocks is clearly exposed in the creek, where the former are seen to rest unconformably on dark-coloured GLACIAL ACTION—SOUTH AUSTRALIA. 123 quartzite, thickly penetrated with a network of syenitic and other igneous veins. The bed-rock has a dip of 45° N.E., but is much disturbed through igneous intrusions. So far as could be seen, the bed-rock did not show glaciation at the line of contact between it and the glacial drift. The indurated and jointed character of the newer rocks is strongly suggestive of Paleozoic age. A. little higher up stream the glacial beds run out, and are replaced by the metamorphic rocks, but other outcrops were found at several spots. Half a mile above the Government quarry two angular pieces of yellow sandstone are seen jutting from the banks on the east side, and a little higher up two patches im situ are seen on the same side, one of them showing an outcrop of 9 yards by 2 feet thick exposed from beneath the alluvial banks. Boulders of the same material were found among the river gravel, at inter- vals, to the bridge, which was as far as the stream was followed, indicating further outcrops of the same rock in the upper reaches of the creek. FROM YANKALILLA TO CAPE JERVIS. The journey from Yankalilla to Cape Jervis and back was done in the day, and as it involved a distance of 46 miles no divergence could be made from the road. The opportunities therefore for examining the geological features of the country were extremely restricted, and were confined to what caught the eye of the observer from the conveyance. It is only fair to make this statement, as otherwise, the evidence of glacial phenomena over this country would no doubt have been recognised to a much wider extent. Glacial deposits were seen in two cuttings on the public road as follows :— 1. About 9 miles from Yankalilla and 1 mile south of Mr. E. C. Kelly’s water-trough, the road passes through a clay cutting about 8 feet high. On the eastern bank, near the top, an ice- borne stone was recognised. It is a subangular block of red- coloured quartzite, rough on some faces and highly polished and striated on others. Measures 16 in. x. 12 in., with a circum- ference of 32 in. x 31 in., and in weight is as much as a man can lift from the ground.* Inthe same cutting, close to the preceding, there is a much larger fragment of angular grey quartzite measuring 2} ft. x 14 ft. No glaciation could be detected on the surfaces of the stone exposed above the clay. Estimated height above sea-level, 300 ft. 2. Another example of boulder clay was recognised on the south side of Fowler’s Hill, just past the thirteenth milepost from Yankalilla (59 miles from Adelaide). It occurs as a pocket in a valley of erosion in calcareous shales near the top of the hill. It * This erratic has been brought to Adelaide, and is now in the possession of Walter Howchin. 124 RESEARCH COMMITTEES. is seen on the eastern side of the road only ; is 33 yards long, 12 ft. high, with base not exposed. The clay carries erratics showing glaciation, which, though numerous are small, the largest one noticed was a greenish quartzite, 12 in. x 6 in. striated. Estimated height above sea-level, 500 ft. CAPE JERVIS. Selwyn, in his report already quoted, mentioned the occurrence of granitic boulders in the fields at the Cape, which he thought must have come from Kangaroo Island, but he failed to recognise their significance in conjunction with the Till which has an important local development. His observations, however, made us the more anxious to see the locality, and we were rewarded in finding the most extensive deposits of a genuine Till yet discovered in South Australia. The bed-rock consists of dark-coloured arenaceous shales and schistose rocks, which, in outcrop, are much decomposed and crumbling. They have a strike north and south, and an easterly dip averaging about 45°. Their serrated edges occupy the beach and in places rise a few feet above high-water mark. Hills of morainic material, over 100 feet high, rise crescent- shape behind the light-house and follow the nor thern trend of the coast in a steep cliff face. Large erratics occur in the light-house yard and can also be seen. singly or in groups scattered over the sides of the hills as viewed from the light-house buildings. In one granitic group I counted thirty close together, partially weathered from the Till in which they were imbedded. ‘The largest had an exposed face of 5 feet. Near to these was a large block of grey quartzite stand- ing is inches out of the ground, and strongly glaciated. 25,sth of an inch. This is the maximum error allowable. Of these distances there will be probably half a million to measure for the Australian portion. The measures are then to be subjected to various corrections, and prepared for publication as early as possible. The labour involved in these operations exceeds by far that required for the whole actual photographing, and will take perhaps seven or eight years to accomplish, provided a special bureau is created for the purpose with half a dozen or more assistants. This is not all. In order that the precise positions which the stars actually occupy in the heavens may be deduced from the position of their photographic images on the plates, it is necessary PRESIDENT’S ADDRESS. 163 to refer these images to the images of a number of stars within the same respective regions which shall have been fundamentally observed with our meridian circles, so that these may be used as zero points not affected by the uncertainty of proper motion. The Conference decided in 1896 that there should be ten such zero points in each plate if possible. We have, therefore, for the completion of the Australian part of the photographic catalogue, to form a catalogue of some 12,000 or 13,000 stars, fundamentally observed with transit circles, and reduced to the epoch 1900. Owing to the great magnitude of these labours, the fear has been felt in some quarters that the refinement sought for the photographic catalogue is beyond our resources, and may indefi- nitely retard the termination of the work. This apprehension is not a fanciful one, and, as it arises from the practical view taken of existing circumstances, it is likely to produce discouragement. It may be that the intentions of the late Admiral Mouchez, the originator of the astrophotographic scheme, and the ideas enter- tained by the earlier Conferences, were not so ambitious ; but if we look further ahead, and consider from a broad point of view the purposes which the undertaking is intended to serve, there seems to be but one satisfactory conclusion, namely, that delay would be a lesser evil than want of refinement carried even to the utmost degree. The essential fact to be taken into account is, that this work is, to a very great extent, for the service of the next generation of astronomers, principally to enable them to solve more satisfactorily than we can at present the great problems of sidereal astronomy, which depend on the accuracy of a great number of relatively old observations of star places. Consequently it seems of paramount importance to attain in the astrophotographic catalogue the highest possible precision, even if it involved an excessive delay. It must be borne in mind that the probable error of star positions, as deduced from the photographic plates, cannot be of a smaller magnitude than that of positions determined by meridian observations. The accidental errors which evade analysis leave their element of doubt in observed star places, which will always remain with the photographic positions as well. The systematic errors, though capable of measurement and control to a great extent, are by no means governed by constant and perfectly known laws, and do not receive uniform treatment at the hands of all catalogue makers and computers. Some uncertainty is therefore involved also in the process of reduction, which will also affect all the photographic positions 164 PROCEEDINGS OF SECTION A. That the rectilinear co-ordinates can and will be measured on the plates within the prescribed limit of 0-2”, there can be very little doubt ; but if we desire the greatest possible precision in the deduced stars places, our efforts must be directed to secure an equivalent precision in the cases of the stars taken as zero points ; and it seems necessary that whatever refinements may be devised and introduced, their adoption should be general and strictly uniform, for the influence of additional means and precautions for eliminating systematic errors from meridian observations and reductions would then be felt beneficially throughout the whole range of fundamental astronomy of position. It is appropiate to refer here to a proposal of Dr. Gill, made some three years ago, which bears upon this subjeet. Dr. Gill proposed that an International Congress of Astrono- mers be held, to answer, among others, the following questions, viz. :—“ Are astronomers prepared to enter upon a_ preliminary study, discussion, and experiment on the practical methods by which the art of observation may be raised to a higher level of accuracy, and its results be derived and published in a more systematic and homogeneous system ?” In recent years it has been sought to improve the determina- tions of star positions, by investigating certain minute errors which had previously either remained unsuspected, or considered too small for practical treatment. Among these may be classed the latitude variation, and the changes of personal equation in the same observer due to difference of star magnitude, declination, or reversed direction of the apparent motion of the star across the field of view. On the other hand, it has been questioned whether it would be advisable as yet to introduce the necessary corrections for these errors, owing to the disturbing elements and uncertainties by which their respective investigations may be affected, such, for instance, as the irregular and undetected variation of temperature of parts of the transit circles, the conditions of the observing room, and physiological questions. These matters have been and are being analy sed with extreme care by leading authorities in the astronomical world, but the results have not so far been finally accepted for general application. Further improvements in the reduction of meridian observa- tions have been looked for in another direction, namely, the revision and redetermination of astronomical constants. With a view (among other considerations) of deciding upon the adoption by the National Ephemeries of a uniform system of these con- stants, a Conference was held in Paris last year for the purpose by the Directors of the National Ephemeries and other prominent astronomers. PRESIDENT’S ADDRESS, 165 The following values were adopted from 1900. General precession ... ses ... 50°2453 Lunisolar precession aint ... 90°3684 ib) ape pe tad sep ee 20 on Tee Pies aise sa nee a 20a Solar Parallax sh ae a 8-80 Constant of Nutation a co 9:21 Constant of Aberration ... ee 20-47 The discussion by American astronomers which followed the publication of the above results, especially in regard to the con- stants of precession and aberration as adopted by the Conference, shows how great is the importance to be attached to the expan- sion of meridian observations, and how urgent the demands for increased refinement in this class of work. It seems, therefore, that in our immediate future we in Australia also must be deeply concerned in fundamental astronomy of position. The Adelaide and Perth Observatory could not perhaps have a better opportunity of rendering extremely valuable service, the one by continuing, and the other by joining in due course, in the observation of zero stars for our astrophotographic plates, and to carry on every investigation, according to modern methods, which may tend to improve the observations and free the results from every possible source of error. Such assistance would be all the more valuable as it would enable the required star places to be determined within a reason- ably short interval from the epoch of reduction 1900, and would certainly be in accordance with that system of astronomical co-operation which is rendered so desirable and in fact necessary by the great breadth of modern undertakings, of which the Astronomische Gesellschaft and the astrophotographic scheme are the uppermost exponents of our century. It may be clearly concluded that the Observatories in Australia need not introduce any more systematic work in their programme for the immediate future than that already considered. Other branches of astronomical research must be left, and recommended to the amateur astronomers of the colonies. The work of the amateur astronomer lies generally in the direction most suitable to his tastes and means. If he possess ability and enthusiasm he may indeed be reckoned as a considerable factor in the advancement of his particular sphere of action. He may take up a subject—a single planet, for instance—and devote all his available time to it, with a very strong probability that he will materially advance our knowledge of that planet. Many important and interesting paths of research are yet left for exploration in our southern skies. | Here, again, co-operation 166 PROCEEDINGS OF SECTION A. is to be recommended, although lately this course has not been favourably regarded in some quarters. One of the fears is that by mixing good and bad work the results bear the appearance of mediocrity, and the value of the best work is thus greatly depre- ciated, if not entirely lost. This is no doubt very true in parti- cular cases, but not to such an extent as to render co-operation such as is practised by the sections of the British Astronomical Association undesirable. A system which directs the forces of many enthusiastic workers along distinct and controlled channels, all leading to the same end, must be beneficial to the majority of persons concerned, and could hardly fail to utilise energy with a maximum of efliciency. The inferior amateur soon abandons a course in which he can make no advance. What is mostly to be feared is absence of definite purpose, and the surest remedy against this danger is co- operation and co-ordination. The best service that can be rendered to astronomy by the amateurs in these colonies is to direct their efforts to a class or classes of observations which cannot be made by observers in the Northern Hemisphere. Thus the systematic exploration of the more southern skies in search of new objects ; accurate and extensive observations in meteoric phenomena are very desirable. If thestellarmagnitude of all the lucid stars south of declination— 30° ccould be determined with Pritchard Wedge Photometer—we would have a uniform system of magnitudes complementary to the Uranometria Nova Oxoniensis extending over the whole of the heavens, which would be of the greatest value as an independent series for comparison with the series determined with the meridian Photometers of Prof. Pickering. There are several telescopes in the colonies belonging to private institutions or persons which could be successfully employed in the accomplishment of this task, by judiciously distributing and co-ordinating the work. These are mere suggestions of courses which seem most desirable to follow. It would be premature and inappropriate to go further into these questions at present. The possibilities of the future in regard to these and many other astronomical researches depending on private institutions and amateurs can only be gauged by an accurate knowledge of instrumental equipment, and the numerical strength, quality, and zeal of the observers available. Such infor- mation is not as yet completely obtainable. ‘The New South Wales branch of the British Astronomical Association has led a good example, which has been followed by Victoria, and may influence the other colonies to gather together their amateur astronomers. PRESIDENT’S ADDRESS. 167 There is consequently some reason to hope that amateur activity may in the immediate future render valuable services in some of these classes of astronomical observations in which the Government Observatories are unable to take an active part. Enough has been said, I think, to show in what direction these colonies may co-operate in the best interests of astronomy in proportion to their resources and circumstances. I will now invite your attention to certain subjects of Terres- trial Physics, which derive their great importance, not only from purely scientific considerations, but from their more or less direct bearing upon our material interests, and also, from the fact that in very recent years, and at the present time, they have been taken up with renewed vigour and determination in the hope of improving our knowledge on many points which still remain unexplained. Prominent among these subjects is Terrestrial Magnetism. Nearly 300 years ago, Gilbert advanced his great theory “ Mag- nus Magnes ipse est Globus Terrestris,” to account for the observed phenomena of the freely suspended magnetised needle. To this day science has not heen able to determine absolutely whether this theory can be finally accepted as true. Another theory is that which regards the earth’s magnetic field as an induced one, ascribed to the action of electric currents cir- culating within the earth’s crust. But whether the earth acts as a great magnet, or as a great electro-magnet, science is as yet unable to tell. As Dr. Bauer puts it, no satisfactory answer has as yet been given to the question “Ts the earth’s magnetism permanent, or induced ?” Still more remote seems to be the probability of discovering the origin of the earth’s magnetism, and the cause of its variations and perturbations. Magnetic phenomena, as they occur on the earth’s surface, appear to be related to solar activity, atmospheric electricity, and possibly to other meteorological conditions, but the nature of these relations is not known. These are large theoretical problems awaiting solution in the immediate future. It has been urged that more systematic and careful observations of earth’s currents should be made, as a part of the regular work of magnetic observatories, and that magnetic exploration of the atmospheric layers, and of the bottom of the sea, is as necessary as the exploration of the earth’s surface for the solution of these questions. Of more practical importance, however, is the knowledge of the distribution of the earth’s magnetism, and of the laws which govern its variations ; for it is this knowledge that enables mag- neticians to construct those magnetic charts which are of so great a service to navigation and to land surveying, especially in new countries. 168 PROCEEDINGS OF SECTION A. And it is, moreover, from the steady increase of this knowledge that we may hope to gain ground towards the solution of some of the riddles mentioned above. It is, in fact, recognised that the main purpose to which future efforts should be directed is to expand and co-ordinate magnetic work, the world over, for obtaining a more correct and complete knowledge of the distribution of terrestrial magnetism and of its variation. Observe that we require to investigate certain physical conditions of our planet in their total effect—that is, regarding the earth as a whole ; and this object can only be accomplished by a complete magnetic service, carried on under uniform methods for a continued period, forming a great net of: magnetic observa- tories well distributed all over the terrestrial sphere. But the realisation of these ideal conditions is, at least partly, prevented by insuperable difficulties. The seas, the deserts, and all inaccessible parts of the earth would always cause large gaps in the plan of magnetic evidence. The available opportunities, however, are by no means taken full advantage of. The permanent magnetic observatories of the world are, all but three, located in the Northern Hemisphere, and by far the greater part of these are clustered in Europe. The southernmost magnetic station is that at Melbourne, and the great expanse between us and the Antarctic Pole gives no evidence of its present magnetic conditions. Yet the possibilities of making satisfactory progress rest with us. Dr. Adolf Schmidt has investigated the question of the Lest possible distribution of magnetic observatories, the combined efforts of which should be brought to bear fully on the magnetic problems of uppermost importance. He has shown that the addition of very few permanent magnetic observatories would very greatly improve the present conditions. Among the localities where such additional magnetic observatories could render a signal service to magnetic science, Australia and New Zealand are specially pointed out. The great importance of a permanent magnetic observatory in New Zealand has Jong been recognised by leading magneticians, on account of its geographical position. The establishment of such an observatory in the immediate future seems to be a duty which New Zealand owes to the scientific world, as it would be hardly justifiable for any country to deny such a great service to science. Indeed, the indifference of the colonies in terrestrial magnetism has been publicly pointed out at Home, and has called forth a well-merited reproach from scientific authorities. The Melbourne Observatory occupies in this respect a very humiliating position, for although a continuous record of the values and variations of the magnetic elements has been most carefully and industriously kept up for the last thirty years, no PRESIDENT’S ADDRESS. 169 results have as yet been deduced, and we are thus culpable of holding back a great mass of valuable evidence which would undoubtedly throw additional light on almost every problem of terrestrial magnetism. Hitherto we have dealt with terrestrial magnetism in its general aspect or “in its totality.” There remains the local aspect to be considered, namely, that in which the magnetic operations are principally intended to determine the magnetic conditions of a limited region in minute detail, and constituting what are generally called “magnetic surveys.” Every magnetic survey of a country is not only of special service to that country in regard to the requirements of the land surveyor, the mining engineer, and the geologist, but forms a distinct and much-valued contribution to magnetic science. In these undertakings the field-work is carried on “by one or a number of observers, who move from place to place with their portable instruments, observing at selected stations the three magnetic elements, namely, declination, horizontal intensity, and dip, also noting and investigating disturbances in their relation to geolc- gical features. The selection and number of stations in a magnetic survey depend upon the nature of the country and on the more or less elaborate character which the survey is intended to possess. It may be remarked that the more numerous the stations the more complete will ke the survey, provided their distribution be judicious ; indeed, there can be very little fear of erring in the direction of making a magnetic survey too minute in detail. From the field observations results are deduced to represent the value of the magnetic elements for a common epoch, which is called the epoch of the survey. For this purpose it is necessary to know the variations and perturbations of the magnetic ele- ments on the days of observation ; and this necessary information is supplied by the permanent magnetic observatory, which is taken as the base station of the survey, and where the registra- tion of these variations is obtained photographically or by frequent observations throughout the twenty-four hours of the day. It is very desirable that the base station should not be too far removed from the locality of the survey. The next step is to plot on the map the isogonic, isoclinic, and isodynamic lines, or lines of equal declination, inclination, and force respectively. After the lapse of time the direction of these lines becomes affected by the secular variation, and the magnetic map requires rectification ; but the secular variation can ‘only be determined by a new ma gnetic survey of the same regions after an interval of several years. 170 PROCEEDINGS OF SECTION A. This necessity is amply illustrated by the magnetic survey of the British Isles. The first of these surveys was executed i in the years 1834~38, the second in 1857-62, and the last in the years 1884-88, and Sih es to the epoch 1886. It may be appropriate to mention that two of these surveys were recommended by the British Association for the Advance- ment of Science. Turning now to the Australasian colonies, we find a most excellent magnetic survey of the colony of Victoria made by Dr. Neumayer in the years 1858-1864. No other part of Australasia, however, has been magnetically surveyed. A new survey of the colony of Victoria is of the greatest importance, as it would settle the question of the secular varia- tion ; and with the greater facilities of the present, some defi- ciencies which were inevitable in the first survey, owing to the conditions of the colony forty years ago, could be remedied. A magnetic survey of the whole of Australia, of Tasmania, and New Zealand may at first sight appear to be a task of enormous mag- nitude, yet it would be well worthy of these colonies to undertake it ; and I consider that the present or immediate future offers good opportunities for its initiation, for the following reasons, namely :— We have at present a large body of geodetic and land surveyors whose services must gradually Teeente less and less required within the special sphere of their calling, owing to the progressive settlement of the country. Among these professional men it would not be difficult to pick, say, half-a-dozen in each Colony possessing the required aptitude for this delicate class of work. ‘The necessary training would be a matter of a few months, the instruments a matter of a few hundreds of pounds for each Government, and the field-work a matter of a few years. Permanent magnetic observatories, in addition to Melbourne, could be established with all desired security for efficiency at the Sydney, Adelaide, and Perth Observatories, with little extra yearly expense beyond the initial cost of the instruments. Other permanent magnetic observatories would be required at Brisbane, Port Darwin, Hobart, and at a southern place in New Zealand. The last two would possess an additional importance over the others, owing to the circumstance that Hobart is the site where a valuable series of magnetic records was secured during the years 1841-48 for the Royal Society of London, which would be of immense advantage to deduce the values of secular varia- tion, and New Zealand on account of its being the most southern station of easy access in our hemisphere. Port Darwin might not necessarily remain in activity after the completion of the survey. Brisbane would always be of great service—Ist, as a base station for its vast territories, where the PRESIDENT’S ADDRESS. 171 accurate knowledge of the magnetic meridian must be of a neces- sity for its surveyors ; and second, for the great assistance it would render to the sea-going magneticians in surveying vessels, who require to verify their instruments by connecting their observa- tions with as many permanent stations as can be obtained. This last attribute of permanent magnetic observatories is applicable to all the stations here contemplated. These propositions for the expansion of magnetic work in Aus- tralasia may appear exorbitant, and out of all proportion with the resources of these colonies; but the science of terrestrial mag- netism is now in a phase of remarkable activity in many parts of the world, and we, by keeping out of its course, simply retard and probably impede its progress. This is therefore another task which will at least claim our earnest attention in the immediate future, and we may rest assured that by so doing we shall receive the approval and the encouragement of all the authorities in this branch of terrestrial physics, whose objects are so interesting, and whose laws are so obscure. The next subject to which I desire to draw your attention is terrestrial gravitation, a force which, like terrestrial magnetism, is obscure in its origin, but which is capable of exact measurement at any accessible point of the earth’s surface, and its distribution can therefore be ascertained. If the earth were a regular and homogeneous spheroid, with a smooth surface, we might expect that its attractive force would vary uniformly, according to a simple law, from the Poles to the Equator, and would have the same intensity at all places of equal latitude ; so that it wé6uld be sufficient to determine its value at one single point, in order to deduce its variation at any other. But the ranges of mountains and deep oceans, the great differences in the geological conditions of the earth’s crust, and probably other irregularities in its figure, disturb this simple dis- tribution, and cause variations and perturbations in the force of. gravity, which cannot perhaps be represented by any mathematical formula. Consequently, if we desire to know its accurate value at any given place, we must simply determine it by actual observation. Hence the necessity of carrying on this class of observations in every part of the world, in order to improve as much as possible our information on a subject which can hardly be considered secondary in importance to any other branch of terrestrial physics. This importance may perhaps be better understood in its con- nection with geodesy, and the figure and size of the earth. It is well known that discrepancies in geodetic determinations of latitudes and longitudes, when compared with corresponding values from astronomical observations, are frequently considerable, 172 PROCEEDINGS OF SECTION A. and that these and other uncertainties can be partly traced to local variations of the force of gravity ; consequently the study of these variations may not only assist in improving geodetic results, but may also throw light on the geological conditions of the earth’s crust to which the variations of gravity are no doubt related. The figure and size of the earth are by no means settled questions. We may know the length of its major and minor axes within a few hundred feet ; but if we consider that upon these data depends the accuracy of our astronomical constants and magnitudes of the solar system, it seems very desirable to exhaust all possible means of research to increase this accuracy. More extended gravity observations, it is admitted, would be of great service in further testing and probably improving the value of the ellipticity or the flattening of the earth at the Poles, and the method is more promising than others dependent on geodetic ares, on precession and nutation, and on perturbations of the moon. We have in the colonies splendid facilities to carry on gravity operations along a meridian of some 30° in length, the results of which would form a magnificent Australian contribu- tion towards the determination of the figure of the earth. Since the days of Bouguer Borda and other celebrated experi- menters and inv estigators, accurate gravity determinations have been made, hitherto generally by pendulum observations, under two distinct methods, namely, the absolute method, which gives the absolute value of the force of gravity at any given place, and the differential method, which gives only its variation from place to place. The instruments used have varied from the nearest approach to the ideal pendulum, as a heavy symmetrical mass attached to a thin thread, to the convertible, reversible, and invariable pendulums of Bessel and Kater. It would be hardly appropriate at this late stage to enter fully upon the many and ‘extremely interesting questions which arose from a discussion of the results obtained in various parts of the world, especially England, India, and Russia ; and I shall there- fore pass on with all possible directness to the present and future aspect of the case. During the past few years a well-marked renewal of interest in gravity work has taken place in Europe and America, which, I consider, is partly due to the introduction of less ponderous instruments, and improved methods of observation, which afford greater facilities, conveniences, and rapidity in the execution of gravity surveys. Extensive operations have been carried on especially in Austria, America, and France ; pendulums have been swung at the prin- cipal sea-ports more usually frequented by warsbips ; and activity is gradually extending. PRESIDENT'S ADDRESS. ie It is well it is so, for even the latest published results show very clearly that much remains yet to be learnt from gravity surveys, that existing data have not been fully utilised, and that a great deal more of this work is required. In the Southern Hemisphere very little indeed has been done in regard to gravity research. There are only a few very scattered determinations made by Austrian naval officers; but nothing that I am aware of at any inland places. In Australia, previously to 1893, we had an absolute determination of the value of g made by Neumayer more than thirty years ago ; observations made with Kater’s invariable pendulums by the American expedition sent out to New, Zealand to observe the Transit of Venus in 1882 ; two independent values for Melbourne and Sydney, determined by Austrian naval officers with the invariable 1/2° pendulums of Colonel Von Sternech ; and nothing more. But we did not remain passive spectators of the interest taken in other parts of the world in gravity investigations. In 1893 the Royal Society oe Victoria created a committee, styled “‘The Gravity Survey Committee,” for the purpose of initiating and subsequently studying and suggesting the best means to execute a gravity survey of Australia. The first and most imporfant steps were soon taken. Kater’s invariable pendulums were lent to us by the Royal Society of London, with which a connection was made with the base stations at Greenwich and Kew, and thus established a base or zero point at Melbourne and another at Sydney, which will enable us to carry on the survey entirely on the differential method with any other independent instruments. A set of three half-second pendulums, with all the necessary accessory apparatus, were constructed at the Melbourne Observa- tory, under Mr. Ellery’s supervision, possessing all the latest improvements, and these our Mr. Love took to England in 1894, and made another independent connection of Greenwich and Kew with Melbourne, with satisfactory results. This is the present state of gravity work in the colonies. We have a well-determined zero point, and a complete set of first-rate instruments, with which the gravity survey of this continent can be executed with great facility, and within a reasonable number of years. It is therefore to be hoped that the Gravity Committee will receive every encouragement and support for the accomplishment of a task which will be a credit to the colonies and a benefit to science. Tcannot refrain from mentioning a wonderful piece of mechanism invented by Professor Threlfall some years since, which has been gradually improved by him and by Mr. Pollock, and submitted to all possible tests. 174 PROCEEDINGS OF SECTION A. Tt is called the gravimeter, and is intended to determine the absolute value of the force of gravity. It seems to have reached, or nearly reached, the state of per- fection, and it is quite probable that it may put a very different aspect on the future of gravity work. Seismology is one more subject of terrestrial physics, which, as it will necessitate more systematic and thorough investigation in Australia in the immediate future, it is in accordance with the pian of this address that I should mention it. I know that there is already a committee for seismological research, which was created by our Association, and that its activity has been shown by its interesting reports presented at our past meetings, and published in our volumes. I may, however, be allowed to point out some new matters, with the hope that my remarks on the subject may not be construed as interfering with the functions of this worthy committee. The seismological committee of the British Association for the advancement of science some time ago addressed a circular to the Australian Observatories, and, I suppose, to other Australasian Institutions, in which we were requested to co-operate with other parts of the world by securing instrumental records of the correct times and phases of “earthquakes and tremors, stating also that these records should be obtained with the same class of in- struments. The proposed instruments are intended to give a photographic record of one horizontal component. Hitherto in the Australian colonies there has been no attempt made to carry on this class of observations in accordance with any concerted method, and with sufiicient accuracy and complete- ness to efficiently serve the purposes of modern research. It is to be regretted that in recent investigations of earthquake periodicity, and in the relation of earthquake frequency with barometric conditions, the Australian contribution of data has been regarded as somewhat uncertain or deficient. These questions, in addition to that of the velocity of propaga- tion, and many others more especially of a geological character, are of the greatest interest, and I have no doubt that our seismological committee will make suggestions in order that the requests of the Home investigators may be complied with. The seismological instruments we possess at present in the Australian colonies are not, I am afraid, sufficiently sensitive. In Melbourne, for instance, the seismograph of the Observatory is not so sensitive as the unifilar and bifilar magnetographs. Consequently the slight earth tremors, which are probably of more frequent occurrence than we may suspect, evade observation ; and these are of no less importance from the scientific point of view than violent shocks. PRESIDENT’S ADDRESS. 175 It seems very desirable that instruments of the form proposed by the Home committee should be placed at the four Australian Observatories—at Brisbane, Port Darwin, Tasmania, and New Zealand, and that the observations and records should be brought under a uniform and controlled system. I must now conclude. It has been my endeavour to show in what direction lay the most urgent demands for scientific activity in these colonies con- cerning some of the subjects within the scope of our section. Whether we will be able to satisfy these demands in the immediate future, depends, in the majority of cases here con- templated, more on the attitude and support of the Australian Governments than on personal exertions ; for which reason the influence of the recommendations of this Section A, and, through it, that of our Association in its total capacity, may be, and, it is hoped, will be a determinant of success. No. 1.—FOUR THEOREMS IN SPHERICAL HARMONICS. By C. CoLeripcr Farr, B.Sc. (Read January 10, 1898.) No. 2.—SOME EXPRESSIONS FOR THE COMPONENT OF THE MAGNETIC FORCE PERPENDICULAR TO THE AXIS IN THE INTERIOR OF SOLENOIDS. By C. CoteripGe Farr, B.Sc. (Read January 10, 1898.) [ Abstract. | In this paper the author investigates expressions for the radial component of the magnetic force in the interior of a coil, and shows that it can be expressed in terms of the differential coefti- cients of the zonal harmonics. The discussion embodies six cases. A table of the values of the first derivatives of the first seven harmonics is given to facilitate numerical calculations. 176 PROCEEDINGS OF SECTION A. No. 3—MAGNETIC HYSTERESIS LOSSES IN FEEBLY MAGNETIC AND IN DIAMAGNETIC SUBSTANCES. By Proressor THRELFALL, M.A., AND FLORENCE Marmin. (Read January 10, 1898.) | Abstract. | THE paper describes an attempt made to measure the magnetic losses in diamagnetic substances by suspending them in a rotating magnetic field and measuring the deflection at any given value of H. ‘The apparatus is described and some of the necessary pre- cautions enumerated. The percentage of initial energy absorbed at fields varying from 200 C.G.S. to 800 C.G.8. is given for sulphur, selenium, and paraffin, and is shown to be about the same for sulphur end paraffin (00004 and -000064 respectively) and about ten times as great (0004) for selenium. The presence of iron is shown to have no special effect unless in the metallic state. Any want of homogeneity was found to very largely increase the energy loss. This suggested that the loss depends upon a boundary effect as well as upon the volume, though it is not clear how this can be. That it isso appears, however, to be the case from the fact that the deflection of a ferromagnetic glass bulb is decreased by filling the bulb with a ferromagnetic liquid, and increased by filling it with a diamagnetic liquid. The difficulties encountered in endeavouring to measure the loss in bismuth by this method are commented on. No. 4—THE TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES, WITH MENTION OF SIMILAR SURVEYS IN THE OTHER AUSTRALIAN COLONIES. By 2 2 BuRBER es bees, as. (Read, January 10, 1898). INTRODUCTORY. In a return of the operations of the Trigonometrical Survey of this Colony, published a couple of years back, it is mentioned that in view of the accuracy attained in our primary triangulation. a more rigorous method of computation, than had been before used in our survey, had been applied in the reduction of the meridian series south from the Lake George Base ; also that a review had been made of the data afforded by the triangulation, TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 177 as far as it had gone, in determining the dimensions of the spheroid best conforming to the actual surface covered by the survey. This work, together with some added since, seems to be of sufficient importance to warrant reference to it in greater detail than could be given in the return mentioned, and as some interest may attach to a matter which is here, it is believed, treated for the first time as far as this part of the world is con- cerned, the following remarks have been prepared. It is regretted that the practice followed in so many other countries where work of this nature is proceeding, is not adhered to by us. As a rule, publication of not only the results of a survey but of the data and details of reduction is made elsew here, the object being to enable the data to be combined with those afforded by other surveys in order to secure the most reliable results, and also to permit anyone desiring to use the survey at a future time, when possibly the methods of reduction may be much improved, to apply such improved methods to the original data. Of course it will be understood that these remarks as to publica- tion apply more particularly to the primary triangulation, for, although the breaking down of that triangulation for the purposes of governing chain surveys and aiding construction of maps is of the highest importance, and in fact forms the bulk of the work of a survey, yet it possesses little scientific interest. It is hoped that in due course a full report of the primary triangulation, such as is indicated above, may be published ; in the meantime such details as may be included within the limits of a short paper will be presented, giving first a short sketch of the progress of the survey, which may be needed to assist in following the sub~ sequent matter and in estimating the value of the steps taken in. carrying it out. It is proposed also to give a brief description of the similar surveys made or in progress in the other colonies. For information regarding these the writer has to thank the Surveyors-General of the several colonies ; the description of the Victorian work has, however, been mainly drawn froma paper by Mr. R. L. J. Ellery, C.M.G., F.R.S., published in the proceedings of the Victorian Institute of Surveyors. The intention is to give here only such a sketch of the work done by our neighbours as will enable the general scope and methods to be gathered, though a study of the history of higher surveying in these colonies forms an object. lesson which should prove useful in guiding our future steps. NEW SOUTH WALES—BASE LINES. The trigonometrical survey of New South Wales had its in- ception in 1867, when information was first sought with regard to suitable sites for base lines ; the measurement of a base line at Lake George being commenced in 1868, under the direction of the- M 178 PROCEEDINGS OF SECTION A. late Mr. G. R. Smalley. The work then done was, however, abandoned in consequence of an abnormal rise in the lake by which the line was covered in parts to a depth of 2 feet 6 inches, and in 1870 a new site, close to the former, was chosen by the Surveyor-General, Mr. P. F. Adams, under whose supervision the base was measured by Mr. A. C. Betts, work being commenced on 31st October of that year. ) 00-02 GL-8€|0L- TL 28-88 21. F 62-4F 0-L1'69-8F| BI-08 | ele iia em: Se lhe 3 dle a ee OnIt] 7 | 7° | £e.2+] 983+ G9.T+|68:3+| °° | 88-T+] 861+ etalon lee adie aise 00-6 00-08 me aA Bt fy a 50 26-98, 00-08 as ** 116-1 66-92/60- LF) 18-21) FE-09) 00-08 GO-CF| °° |Z9-0F 99-96/9E-LF1ZL-81|F0-09) 00-08 oc oe D0 -+ log. s+ 08.08 00 ae ar Bo 60 + lon 7] $8 08 a "* 1G1.68/S9-9G/89-GF|TF-91/8L-8F| F9.86 LE OF) °° |16-8E/16.P3|TL-SF)20- 21/68 8h) 96-86 oe "* 166-L8/LP-66|L0-9F) ** 98-T& | 98-I—}| °* “i 88-8—| 60-6 — 00-0 "* 198.G8)19.13/1G-FF] °° on | 00-08 a “* |L6-88/GP-66/96- FP) ** “* | 99-G& | 99-G—| °° nid §T-8--| 18-6— 00-0 “* |19.98)92-0G/6S. TF} “* | 00-08 "> | ++ ltegelesozies.ce] «° | -° | PL.Te FLL i me 10-T—| 9S. + 00-0 f ~* “* |L9-LE/61-SG/6T. TF] “| 00-08 - ** |PL-68/66-96/66-P| ** “* | 68-08 § 68-0—| °° ~ 6h | 66. = 00-0 ft ~* “* 1GG.86 OF PG OF- GP *” - | 00-06 oS “* 106-16/G9-GC/ST.SF} ** “* | 04-08 | OL-0—) °° i FE-G—| GG + 00-0 f ~* “* 10G-98/98-F6|SP- FF] *” “* | 00-08 a ee “* |LG.GGILT-SF] °° “* | SL-T& a oe a 6 00-0 f°" aa “* |PF- FG) FO-GF) ** | 00 08 eo 50 Be ar ais 90.28 ays 6 OG Be 00-0 : oe 30 bc “* lez.e1}09-96 00-08 Ee - “* 120-41 Gg. 18 Wee > 5a oe 00-0 | GP-98) °° ty - “* 16G-G1) “| 00-08 69.88] “" |80-LF) °° “" 1 88.86 se > WGA) |= 00-0 f - “* |CT-0F| °° |02-8h) ~~ “| 00 08 86-18/18-SZ|FO-2F| °° |16-6F| O€-86 } O4-IT+] °° cg. + | 76. +] 886+ 00-0 “* 180 G1/89-6E|10.26 FL-Sh] ~" {19.19 00-08 68-68/1Z-9E|18-9F| °° |L9-8F| £9-66 7 LE-0--) °° F9.T— | 20-T+} 10-L+ 00-0 60-01/92 $9.96 F1.9F| °° |F6-8F) 00-08 ** 1GL-83/99.9F| °° |G8-Sh| $6.66 | 94-0+ Se ra cI. —|97-6+] ~° Z0-T+| 00-0 | oa “* |SP-FS|LF-LF} °° | 19.6% 00-08 ** 10F-FZ/L9-GF/ZE-L1/6G-6F| 0-86 } 246-E+] °° 98.§4+- * F1-1+| 62-6+]| $8-14-| 09-6+| 00-0 “* 160-G1] °° |L€6-96 F¢-LF/66-61/61-1T9 00.08 en yy “* 118.61] °° | SE-86 | G9-T+] €8. 4 ae nt a te F0-F+| -° 00-0 |] 96-6€) ** ae i. ** J6P-12Z! °° | 00-08 ve fee fee PPT ee | oroe I trol es. —| be Gos |) or ‘a > loooltesel: |c: |e: |e: bo |e | oo.08 GZ-65} °° Be “* | 6F-66 f TG-0+] °° es GO-T-+| °* np ae 60-0 = 192-68)" ~ a ae + | 00 0€ a “* 16L1-88/69-FZ|66-€F| “° |60-6F| 88-08 # 88-0— ms (65 Sa AGS Aa 8§- —| 00-0 vg “* 1F8-16/99-G2|LL-EF} ~° |1Z-8h, 00-08 ie “* IPP.SSOL-GZILL-FF] °° |LL-6b) OF-O€ | OF-O0°-| ~*~” ne (Wp SfSlis saz GL. +] 00-0 ey “* $0. 88/9L-F2\TL-SF} ~° |TL-8F) 00-06 4 ** 100-OF|ZL-SZIF9. €F/08-91|20-6F| 99-08 | 99-0—] ~~ aie 04 +] 20. LLG TL. T—]| 80- 00-0 Cg oe 9¢.F6 80-SFIFL-G1/L¢-8h 00-08 me ** 16L-OF PF-FZIGL-FF|68-91/Z0-6F| 08-66 f OL0+] °° a GL.G+| IS. +] 98. —| FI. +} ST-I-+] 00-0 is F1.G6'68- FF/69-LL/EL-GF 00-08 ae ~ ie. “* 169.9] ~° |19-9F| $9.08 | F9-0— ee, * ya Seb ari” 9F-G—| 00-0 itp Ze "* |OL-9F] °° |&T-9F) 00-08 ae “* |PL- Lb) €L-66 | Le-0+] °° = (OF [Gate |e a “= 8g. —| 00-0 a oe | PL OF|) ss ie “*- 110-8F, CO-08 LL-GFLT-L1/ 10-8) 0S-TS } OS-T—} ~~" 90-6— | 08-I—] 64-I—] 86. —) 84-T—} 80-6 —| 00-0 “* 119.6 |F6-98|P8 GG L6-FF)19-ST|LE OF 00-08 18.9F VOL 6GHIKOS: One |(6=) a) 2k 08: +] Ty. =| 46-T+) ~" id 00-0 f P§-8E) ~° |FS-6E/Z6-FG AT. LP) °° “* | 00-08 LL-9F/EG-81] °* | €6-8@ | 20-T+] ~° ve > FL. +1 66-1+]| ST-2+] °° 00-0 MG po “121.86 F3-LF,09-61T| “* | 00-08 6G-9F|9G- LL FL-8SF| 60-0€ | 60-0—) ~*~ oa Pl. —| 86- —| GZ-I+]| 86. —| #S- —] 00-0 re “* 100-88 OF- PG 0S-9F LT-L1 S0-8F| 00-08 = wl a 2 = = ~ ~ Fad 4 wl o = oo woe ma; ea as ne ro & ae ey a 2 S a 3! a=) S = oo & coe me ae a ne of = SERB leo (SEIS las |RF| wot fs 5 & 5 5 = S| oS | oe ee law [as (as las |g Gy [Poise [ee eS aS SE ees || eae iS e o Eb = = & 3 GI) | TS urivees Pd (eey Sn | ten SU ob laP loa Dlos les |S (S81 co a 5 cs = = 8 ot lm © len Dles (ee |S ISB mealed |me laf 146 S iNe 5 n Lz} c. ? } a = Ma lot lwo |e? | =o on | eS teh || 4s} || SS IS |) SEN) rg § e 3, = 5 She) SEF | ea Sl oe | g 5 He LT Ss ro) 5 uch ‘a 3 © =), ee MEP. al Fe (26/F/E 4 Z6/G/0S ‘UOTJVadasqy JO 99% 5 F6 ‘ON *S YL /SL “SUL :syoorg “f “toadosqQ) ‘oysntosoy ‘aoyxyg “quowysntpy [eoory ~ TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 189 The figure to be adjusted is that shown on the below diagram which is followed by a table of the locally adjusted bearings at each station, each bearing being followed by the reciprocal of its weight and its symbolical correction. Purrorumba le atm Fan Iwyn2n Alisle ye je / 1s eS i |< y L, Na ea < Yarrow Pre Ternent | Lowden HON | (Tumanang Umaralla 190 PROCEEDINGS OF SECTION A. TWYNAM. ° / WV IZUEROVIIMAD A nseeeocede de cece ceaeereeoneteee 296 30 18:5] IL ONO KE8 3 ey aeemoc eee oer ooenee Danna ansuce cc 174 31 45°25 PYEUTOWA Piste ge ae teil Soe Sa OO eee ee 220 27 =8:04 PURRORUMBA. AIRWAY DAIL, Zio civateainos siee'ssis ve sales ve sie wie sejanie 116 31 56°82 IV AA ETO Wao rece a seston, caesm cman ERE oe eee NSS. We DLs38o Atria Siegen cont rahe sta mrare otove ee iolacs orcs metesoicte ae 236 34 43°11 YARROW. TMeyy. yA ans errs Rerncm Sa cota a caete emer 40 27 10°17 WGowidlen=-Menacaceontecn eaeccuinnetbiontcne neato 109 3 35°87 MIN MOLLY: . veajti oseetes asus sot ananestesewacenasies 190 7 33°34 dl Nevaa sh ate eer eeen Sanpeeooseette va neo CReEncee 242 44 40°35 PANTS ITO Frey cnerctavat relent nine oie oe Nome omentnocen nel: Sills} GEL Bits IBULLOLUIM Dai. cmecn occ n roc oreec eran ene 8 6 14:02 AINSLIE. VEEL OW “askracaas gor saacccs nance aneeee eee aneets Isis) 2) aor 7 As) ac) id otter em esmere sneer rena insceadococaeTo 198 13 54:24 IPULLOLUM ba caccsse Cheaeiecccemenee te aeeceeee 56 34 45°58 LowWDEN. ADURIMENAEY NE?” Gag “onsodcanaanonocee nooconocansoner 200 16 51°93 PRU CLV esa en cease arietens vcrananceeos ses 232 20 17°43 WEWSRONY cSaoononcee ate Aalto cae ec oeaane toate as PAY Bio} ll ARYAN. soanooodcodoon oocossqon:0s0dees s00800 304 31 48°24 TENNENT air icvcigtaavace coat outa oanceseneaestonien einai 176 57 56:03 Bimberi...... Fe ORC CTC yee oets 241 55 20°82 NGL aXSTaUe We aenasuoenenOaddoue: nodoBrcoaconbd dose ccs SMO MEO WAON OWassaisian casera aaacat ineec Seeuosncriaeie eter 62 44 41°59 RINGER, “Wea see-taceuteiseloaeceoestnisiciemanetsrs 128 25 38°55 TINDERRY MUMANMANG a: c sce. pesesegeretsastesses neces 107 26 30°92 Wamarallla.s scccsecosee ace ytaescctace meee ecn 167 53 24°68 (G1 Cry eee etre. annanenncancnotnenndace ace 223 10 30°98 1 Bvt 0101-) Gl RRR mn It ARe emma otina se Sear paGs 275 19 56°81 FTGUINEMUG © ce soeerscase cea oee eee 308 25 37:44 NALTO Wie iaciss sowag ccisce neice Becta ecto ecece LOW ies O02 TOW Oe Dai. ssancesseaeaceseroascnamecsartiaesonscr 52 20 22°86 TUMANANG Wow.cdleneeeneessceer BOM ancora aracodonionocatc 20 16 51°96 [Dinara ley Gaaesponeeenaccacuasar cnnaocuctonnocaos 187 2 23°81 Clear eres: aswenae cana. ceceniumesuememe cee 248 49 35°33 ADWACIETEA? “np necaaooangoco sansnondaeancodooceooneT 287 26 25°32 iS bow oa oOo > me Oo he Ree bore aon ne Ee wowrml dowry me OO D1) ~~ SSE NSE NS TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES, 191 CLEAR, ? ad ale enn enitt = <3 cccoccceeresecaeeee noone See eee es 356 57 55°47 :046 (36) MING OW ascie as cm tcememeyacen aires deasaslenereias 43 10 32°64 -024 (87) PMN ATA OS +) nies sorueteeepecesiee ans aessiensloos 68 49 43°39 -048 (38) LUACO CITE US) Re Aaa ess sn 2 ne ee 139 19 57°09 -040 (39) 1 By 0011015): soe ae ARBRE eco cbc ScioncosOCORTTRCRe Ore 313 53 11°54 °024 (40) UMARALLA (CLSEIP Ging Rene eR Re Rp tn 50 oc0C8 BOER meeeames 319 19 52°49 -031 (41) AMR OTD ssi sins so elemosetbratameeoiniisiagace/eesss 347 53 24°88 055 (42) PIN ATI AN OY © ch sacasvei nae vaasmmceonseniiviecenslas 7 92:32:27 7026, (43) From the above, the angle equations are— I = + ‘825'+ (1) — (3) - (4) + (5) + (7) — (12) II. 0= + ‘309 —- (5) + (6) — (11) + (12) + (18) —- (15) TUE = — ‘807 — (10) + (11) (13) + (14) -— (22) + (28) Ws O05 “783. —. (91) 2 (Or = C3). 42 (OY) = (29) 3180) V.0= — ‘1383 - (2) +(8) - (7) +(8) — (18) + (19) VI. 0 = + :162 —- (8) + (9) - (17) + (18) — (30) + (31) VII. 0 = — 1:201 — (16) + (17) + (25) -- (31) + (32) — (85) VIII. 0 = -— ‘379 — (25) + (27) -— (34) + (85) — (387) + (88) IX. 0= — ‘701 + (20) — (24) — (27) + (29) — (36) + (37) X. 0 = + °587 — (83) + (384) — (38) + (89) — (41) 4+ (43) X1.0= -— ‘084 — (26) + (27) - (87) + (39) -— (41) 4+ (42) And the side equations are— XII. 0 = + 9:241 — 5-228(1) — 20-387(2) + 25 .615(3) — 7-005(4) + 25°667(5) — 18°662(6) + 15°303(13) — 12°294(14) — 2-909(15) — 13°820(17) + ast) — 9:608(19) — 21:396(22) + 30°911(23) -— 9:515(24) - 11°338(29) + 34°548(30) — 23-210(31) XIII. 0 = — 25-009 — 3:310(8) + 19°397(9) — 16-087(10) — 33°621(16) + 47-441(17) — 13°820(18) -— 18 604(20) — 9°515(23) + 98:119(24) + 1:045(32) — 26°363(34) + 25°318(35) — 20:184(36) + 64-023(37) — 43°839(38) XIV. 0 = — 30°60] + 9:838(20) — 18-991(21) + 9°153(24) — 16°358(27) + 48°662(28) — 32°304(29) + 22°517(36) — +261(37) — 22-256(40) XV. 0 = — 28-426 — 10°149(25) — 14°588(26) + 24°737(27) + 11-296(3) — 37-659(34) + 26°363(35) + 19°531(41) — 38-683(42) + 19°152(43) The corrections in terms of the correlatives and the normal equations are given in the two following tables. ra LS 192) PROCEEDINGS OF sO) A I STATE ve PSU AS TESST TU TE SSS Tbe TH TUTTE TS STS SE ESWC dM Wh ae SECTION A. ceeeee sees eens eee eee wee ee eeeres eeneee ween seneee see ee eee oe eee peeves ee eeee eens eee sen eee a eenee eevee ners seeeee beeeee eens teen eo eeee teens eeeree eens ee eeee Lee nee eeeeee eens ween teers eeeeee eres we neee peewee veeeee serene soeeee eee seen eee brews eeeeee eee ee eeee eevee ee eeee eeneee eeeeee ee eeee eee eee Corrections in terms et teee eeeeee eee se eeee ee neee ee nee sees eeeeee eee eee eee eeeeee eee seeeee wees ereree Cannes seceee eeeere betwee eeneee ne eeee eens Caves eee beeeee ween eeeeee eee eee see eee teens eeeeee eeenee were seneee tonnes tenes weeeee seeeee eeenee veeree ween eee Seveee bonnes ee ee veneee sere ween seeee eens beens ee eee eee eee seers seeeee seeeee eesree beeen TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. of the Correlatives :— Ce i er CO ere Ce es ee ir i) eee wees eee e ee eee sete ween eaten eee wet ew wees ett eee Beeccccse | covccesve eee eeeeee eee ee wes ee ween eee e wees sateen eee thee wees wre eeeeee eee eeees teens = a Ere... + °045 BEE. | ekseees MMO4SG | ow. cas . + UE eae Bosco — ‘048 Mee cccs. + 040 ee | O31 Fee nnneee eee eeeee teens wee ween wees sete eeeee tee wees ween eeeee eee eee tee e wees renee eens ee eee eee oe eee ee — 104560 — °998963 + *512300 — °1383095 +1°463019 — 410564 sete ewes Cerne eees eee een eee ee wwe eee eee eens + °198939 — ‘285062 — 110542 - “8t40 171400 — ‘586088 “Bite 494576 333025 ee eeeenes fart — *328802 + 1°692852 — 1°369390 eect roee + see ee wees Fee e wrens ween eeene seen en eee enw newes ween eeene 086060 *310352 836524 —1°311219 + + 2°704137 “691000 Biibs 152240 984165 wenn w wees eee eens eee enee sane ee nee eee e ewes — 1:186335 + ‘708904 928464 + 1°536552 — 2°104272 pee neseee sere wees seen n eee seen eens + ‘157408 — 626703 Pes — 605246 +1°508522 — ‘936816 eee ween aren wees Bete e eens tee wees +1°035782 — ‘006264 eet weneee Sees 4 eee wees tte wee 193 eee esene ster ee eee see eee eee teen eneee eee eeeeee eee weeee — ‘131937 — *262584 + °915269: + "869792 — 1°694655 + 738164 eee anes teen eeeee see eenee tee eens + °605461 — 2°127565. + *497952: PROCEEDINGS OF SECTION A. 194 CZ008F-§ + 86869. — CSocrL-T — TOTOLS- —- GPREGE-§ + osgTs¢. + tee . eee eeenee ween seee CEL866-6 — GCOTEOIL-L — een eenee oe eee seen eeee weer eeeee OFGFO9- + CGc9FG. — Ce ber eeenee TLILG3-T + 17470) (ee SSOF6I-T + #90. — teeee ne FSZFS9. + TS8EZ9. + eee eenee ere eeeree serene enee bene eenee eee eeeee te reeeee + tenn Cee rennne FLC6L6- eee eeires eee wane eee seen See eeneer cen Pen oeeees Feeeweeee tee e eens teense . eee eereee eee eeneee Seen eeree one Ti *suoTyenby [VULLONT 9GP-86 —- = 0'AX 109:08 = = 10) ASX 600-6 — = 0 ‘TITX 17-6 + = 0 TIX = =O “gg. ++ = 0'°X 102. -— =0 648: - = 0 TIA role = = (0) INU Nie ar = OTA ello = = (0) TaN CSLiss ed = =O) NT AQ = = (0) SINE 608 + Gos. + 195 GOGSiIG aan - S9S9ES-T — | : LSTEST-T + 1" i GPRELG-L + GPIOE9-L9 — 9f61L9-3 — ELISSs.1 — GS6869. — CSAIL = 9Z0S9E-€9 0G9LGG-ST — 6OFFS6-F6F + OL6IL6-FL — 69699T-S9T + OG9LGG-ST — LEOLLG-FGG + OL6IL6-F1 — 9G0G9E-E9 + LE6LI6- + eee eens SOUTH WALES. TRIGONOMETRICAL SURVEY OF NEW meen | GPPELG-L +- | PIOEO-L9 — | TLOSS9-L96 + | Zzr00. + |" i ‘TIX SLIsce-T — | 38686. - | agcges.T - ewe: | GOCE, TLO. + 190. — ‘ By ‘1X OS6TL9-6 — nesses | pogstg. + veneers | THQ. + Log. + iaaacae «“ Yy 69ZST6- —- | E9G9Ec-T - | LOTEST-T + | E2zP00. + | 190 - a eet be "XI CZOOSF-E + | 86862. - | S8CCFL-T - Seine eae MELO Oen te £60: — 190: — . TTA Bavaccs soe | ozpggg.g — | ZoreoLT - wired epee Basti « TA His aghcbin ane LT opepog, + | ezzore - patente pate woae digas « “A eee eelethiadol + | eberOL0: =~ =|, 6076+ T+ ee Ss a POOr og “AI Pnstulel: sadaeees | tetera, + | pegoras. & pert vopense reat « I Tes tiasea sabmeainen as miehesrs || oreaeg = on vanes ecaeei « 1 Ete Nora aie Sea Gee. Pea vatisates Bate ppcepoce panuruoy * rT oe ol 7 oT en SOs ‘panuryuoo—suoryenby [VUULLO NT 196 PROCEEDINGS OF SECTION A. The deduced values of the correlatives are— 7a I, = + 29375 1), = Glozal I; = — 5:2687 I, = + 89930 I,, = — ‘0810 I, = + 49170 Ie = + 9478 i, 1087 T, = + -4582 Ip = +10°3610 1, = =-b 28278 Is,= + *4923 I,,.= — 8545 1). te 2526 These substituted in the equations to the corrections, give the following values :— (ly = —-1874 (16) = —-3065 (30) — '2585 (2) = +°0568 (17) = +°3179 (31) = —2464 (3) = +:°1142 (18) = +0507 (32) = +:1970 (4) = +1494 (19) = +:°0775 (33) = +°2855 (5) = -°2340 (20) = +4:2273 (34) = --4691 (6) = —-0826 (21) = —-2051 (35) = —-0628 (7) = —:1090 (22) = —-0987 (36) = —-1063 (8) = —-0607 (23) = +:0364 (37) = +:0250 (9) = +°0292 (24) = --2479 (38) = 4+:°1574 (10) = —-2037 (25) = +:°0713 (39) = +-2109 (11) = +°1833 (26) = —-1766 (40) = —°1748 (12) = +0811 (27) = —-0883 (41) =. ~:0105 (13) = —-1485 (28) = +4:°4937 (42) = -— +2003 (14) = +:°1362 (29) = +:0072 (43) = +:1036 (15) = +2092 which applied to the bearings give— TWYNAM. PUTT O RU Dae aesecs ceciasis solswiess ere sejaisie wis) sistas oteiwraisieleloeie'sloreate 296 30 18°373 Wicayy. lem cata oer ssindc mers domo nemes seein ne sleereistesiciatersveuieiiscie 174 31 45:°307 SVAALT ONVitens soins cicers ation ciadin wae sets staisietetsisisie sietcarmisiointe solojele Gls 220 27 8:154 PURRORUMBA. MUSA HELIN < 25 -(2aiscisla Seleiseie siete asmielseamiceioelarieet-isinn eels “ssl 116 31 56°969 WHAT O WAS oe cma nneies Gar Sea eeieces ste BoeiEn oMrcbineeimanemenas 188 7 52:096 FAG TMS ITO Ae secs eos ecco see WORSE ROR eR ere eee ee ia aGis elsielatoins 236 34 43:027 YARROW. STEW TLATING ss ajaiesictsite sstsiesisaeninesune Ue PaNsaa ence cies Wesiastme 40 27 10:061 I wy CL GU eee areelaiatore nists toeonGieten ne cinneree emcee Mawiece rene soeerisle 109 3 35°809 ANIAGIENTEAY. Gaasodacnanao5opanddadonocoDsconsaqcdsasacecdec000s03% 190 7 33°369 FRETS TGR vs acetic 35 4 43°515 148 16 14°835 IREOSCMUS KO ee suiccicie « ses.sieslaecies wea 36 27 28°350 148 15 53:°434 Mein Di German icceceses cece atconeecer: 338 28 24:043 149 59 24-600 WOW Gliese acocker cons eswcheueases 35 30 13°010 149 35 0:056 NWOWICSIE Stet tnsc>. os oedssascaseawonece 8) Bi) Sil 98318; 149 48 45°945 IVIICATISUOEA te crtcnccssccececoneeaete 84 27 3:°499 149 45 16:290 IMAC QMARIC, Foc: edieucsseececwens 33 38 52°872 149 10 56-790 IME RROYOD, “ors eB Bepaoaone Be Oepepace 33 28 3:968 150 59 40:200 WVUGinn AIRY ae rasa coc sceasvesecacc soso 3p) U3) 45°387 148 7 37-080 Nita) Gaptenees tastes ccs nes esemese cece 33 48 26°329 150 ote Dis1D0 Wiig OOMEN +. cetasctes-deceeouen. 34 49 47:920 149 2 38:085 INIDTEEEN Ee Rb so ROBE BEER oceeaneceee 34 23 46°627 149 6 48°S810 INGUIN le ctossraensewatdthents ositcaa goes Al ey Gee's 148 45 18:975 IN irradia aiaeecancsuecesacescesecciose 34 29 42:942 150 6 58:440 Observatonyn.... vsccnecssse cases: 33 51 41:100 151 12 23°100 COAVGIOE eh cer eee ae 33 24 46°667 149 46 40°590 ILO Laem oestosncrekociiootber 36 45 21:°504 148 12 26:348 NOLES Meee Re ee oetiaie ecicsGenesbeets 33 53 36°834 UG BP styles BOUIN MEE Nea cre thcsh ccs ecient ane sp) pp 7forilles 150 41 38°925 BROS PECUi en secnebs sia sinco se asenee se 33 49 10°480 150 55 38:'190 12 WeeOTANITN SY. Gocdcadeneeooroneobeee a5 9) 10-bit 149 22 48:780 IRGC * - Soke Moe aren Rad aR GEES eC RE® 33 44 31:'397 Wak 83 By /Se ti ROCKS BE eter ener temsemeeckiteds see 33 26 31:016 149 24 26:070 UVM Rea ccceatewsiseceataciteraaesss 33 51 0:940 149 27 11°505 SSC OUb eens ecccicceciden wobieae sicvelae: SoMo) PEeELss 150 37 24°540 HIVETIR Deeg aeduschcessscenesteatce- 34 7 39-493 L5OF 2 75590 SPO IS dats cewsenscise cence 35. 5 45:054: 149 5 £7:860 SMOStiEUGEMascccses cach ccckscet onset. 37 10 33°405 149 § 10°866 Meninenibee eecatccccenascat seccetee: aby epi 7/XUB%9) 149 2 46:081 HINA OMY Pa ee sias seme ois ile 03 cata etess 35 41 58114 149 16 21°449 Abrinyegt 1ente¥eal: 6 scaGoaoq0bpaqoenenoene 36 59 59°385 148 40 42-404 “Novae al, Aa. aera Rn A 300 32 45440) 150 25 31:005 MMO MATIOH Ses Aetesieece welt denees elas 34 45 21°356 149 49 28-755 SIMIMNATIATI OS semaesseseadsece tsp se 35 45 2°244 149 28 18°822 MUTINY ONAN ee yeatee aa lseeiiteeleieestetstes 35) 14) 128925 148 30 6°540 PIMA cots acuciians «snedecastass 35 13 20°473 149 32 59:925 Wirrrarralllaererencctecit eeestesctcaros 36 11 56-006 149 24 13°848 Wal broolet say fh. cs. ccescssc een. 36 11 35:238 148 53 2°408 Narra wOlong) 2 oncc.cc.sesneee 33 2 44°885 151 15 59-115 Wiel seeeeesee cece ace ti eecoeh caer 34 fi olei0 149 I3 14-160 Wiheelot Hortume’ t2c...:sce-..0: Son (oa Gl55 147 33 38:415 Wailanist ass tcc .aeanes teen ateceec. 35 8 4:834 147 22 24-600 Wioronotar séscuhesh cesar 34) 7 753980 150 57 14°610 BYOTNO Wale cc hoe taco: 35) 25)56:922; 149 19 53:086 RaiVieTien eenacisase nace catencee nee 3b) 13) 2337701 147 50 11:190 AEGINEZO) A Sinaneedemeiasessesconecnac 82 59 10:242 150 51 11:970 204: PROCEEDINGS OF SECTION A. Having given the co-ordinates « and y of a point A, the distance AB being equal to s, and the angle which AB makes with the meridian of reference being represented by a, the co- ordinates x, and y, of the point B, and also the back bearing a! from B to A, are found by the formulee— m y mn q =YyYtn— 7 r nn J 2 r* 6 r Presid Se a Ue i! 9 6 r m 2 mn = + 180° — : — r* sin | 3r* sin 1 in which r is the mean radius of the earth at latitude of point midway between A and B (that is, square root of product of radii of curvature of meridian and perpendicular to the meridian), m= ssinaandn = s cosa. ALTITUDES OF STATIONS. The heights of the various stations of the survey are determined from observations of the zenith distances of the surrounding points, made at each station visited by the observing surveyor. The simultaneous observation at each end of the line involved, which is necessary to an ideal determination of relative heights (for by that means only is it made certain that the co-efficients of refraction at the two ends of the line are the same) has, of course, been impracticable. The work, however, is performed always at the same time of the day, so as to secure, as far as possible, the same atmospheric conditions in the reciprocalfobservations. The actual field work consists in the measurement, with a theodolite having a 10-inch circle, of the elevations of all the stations in the surround, noting, at the time of sighting to each, the reading of a level the axis of which is in the direction of the line being sighted, any variations of the level being subsequently applied to the circle reading. The instrument is then reversed and a similar round taken, each such pair of rounds constituting a set from which the differences of height may be derived. The question may arise whether the number of sets taken has not of recent years been too much limited to give a reasonable assurance that the mean result will represent anything corresponding to a mean condition of the air, and though the resulting heights prove fairly accurate yet improvement may be expected to follow an increase TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 205 in the number of observations. There is little doubt that the principal source of difficulty in trigonometrical levelling lies in the considerable and irregular changes in the atmospheric refraction. This cannot be better illustrated than by the experience obtained in India, where apparent zenith distances of points only 10 or 12 miles away varied under certain circumstances through a range of as much as nine minutes. At first sight it might appear to be useless to go on duplicating such apparently wild observations, yet consideration of the nature of the question will show that the great range among the observations forms, itself, the reason for extending them to cover a longer period of time. Bessel’s opinion on this subject may be gathered from his estimate of the relative weights* to be assigned to such observations, the principal factor in the weight being n, n,, where n, and n, are the number of days on which observations are made at opposite ends of the same line. The differences of height are computed from the very con- ‘venient formula— aes ater Ua (Ie oes ey 1 2 OU i ’ where hand h, are the heights respectively of the initial station and that station the height of which is sought; € and @, are the reciprocal zenith distances observed at each station ; s represents the hori- zontal distance between the stations, and FR is the mean radius of curvature of the surface in the vertical plane passing through the two points. This formula involves only one trigonometrical function, and the values of A + h, and s’* are readily obtained 2k 12 from tables prepared with arguments h + h, and log s respec- tively. Considering the small number of observations referred to above, the deduced heights agree remarkably well both amongst themselves and in comparison with heights obtained by spirit- levelling, principally the levelling made in connection with the railway surveys. The only difference of any magnitude which has been revealed has been near the northern limit of the survey, where the heights of station Skeletar, close to Muswellbrook, deduced trigonometrically and through the spirit-levelling, differ by 9 feet. An adjustment to the railway levels has not in this case been made, as sufficient confidence was not felt in the accuracy of the railway levels. These were made some thirty years back, not under Governmental control, but by a contractor, and the writer is informed that where examined they have not been found * Grademessung in Ostpreussen, p. 196. 206 PROCEEDINGS OF SECTION A. trustworthy, errors of several feet having been discovered in places. It is earnestly hoped that it will not be long before spirit-levelling of precision is undertaken in this colony. The approximate adjustment of errors of close in the altitudes by a system of means, which on taking up the work it was found had been followed, will be shortly replaced by reduction on the principle of making the sums of the squares of the co-efficients of refraction to be a minimum, recognising the refraction as the main disturbing factor. CO-EFFICIENT OF REFRACTION. As a preliminary to the determination of the heights of stations along the south coast in the counties of Camden, St. Vincent, and Dampier, the co-efficient of refraction has been calculated from the reciprocal observations on nearly a hundred lines. The mean of all the values obtained is Ke 12 162e- 0012, In discussing these determinations the conclusion has been arrived at that the generally accepted formula from which the co-efficient is computed, R Sin 1” |e ara Ss (€ + & — 180°) is inadequate, and may without great labour be much improved. In analysing the south coast results it was observed that the lower values were somewhat remarkably associated with the lines of greatest slope and an endeavour was fruitlessly made to connect the two conditions. It however suggested itself that as the steepest lines were usually the shortest, a connection might be found between the change of co-efficient and change of length in the line. The co-efticients were accordingly grouped and gave the following results :— Under 10 miles. 10 to 15 miles. 15 to 20 miles. Over 20 miles. I K 096 ‘113 126 135 TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 207 Plotting these values and taking the average lengths of the lines involved gives the following diagram, which points to the conclusion that the value of the co-efficient may be very closely represented, for distances of less than 30 miles by a circular curve. 0 wiles SE/- 208 PROCEEDINGS OF SECTION A. Analysis respecting the longer distances shows that, for lines greater than 30 miles, K may be taken as uniformly equal to -135, and for the results above outlined the co-efficient for shorter distances will be best represented by the following expression, in which D is the distance in miles :— K = :135 — -000081 (380 — D)*. Examination of some of the results obtained in the United States* shows that they exhibit the same need for bringing the distance in as a function, or what comes to the same thing, the height of the ray above the ground, for it may be assumed to var with the distance. It would seem then to be established that the practice of using an average value derived from the formula R — (ae Ae will need modification. It is to be noted that, in the above dis- cussion, Struves’ pressure factor » Where B represents the mean reading, in English inches, of the barometer at the place of observation, by which all co-efficients may be referred to sea level, has not been applied, the area covered being nearly enough at the one level to enable it to be disregarded without affecting the con- clusions. It should be observed too, that the co-efficient deter- mined above results, not the mean refraction, but the refraction at the usual time of observation, 2 to 4 p.m., when though less liable to fluctuation, it is really at one extreme of its daily range. In the absence of proper topographical surveys which would fix the height of the ray above the surface, it is of some importance to investigate the general effect of changing distance on the refraction. This w {Il be seen when it is remembered that the co-efficient is determinable only by the reciprocal observations which are usually made only on the longer lines of the survey, and that it is, as a rule, needed for application on the shorter lines, which are those fixing stations from which no observations have been made. The gre eat advance which photographic surveying has recently made leads to the hope that it may be usefully applied to obtaining such topographical information as is needed for a proper discussion of terrestrial refraction, both vertical and lateral. In the course of examining the refractions it has been a source of regret that the few photographs from each station, which were needed for this purpose, were not available. The usefulness of even such an approximate topographic survey for affording other information will be referred to later. Ke—se—— *U.S.C. and G. 8. Report for 1876, p. 371. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 209 MINOR TRIANGULATIONS. Before proceeding to the astronomical work of the survey it may be mentioned that to meet various needs, independent triangulations have been made at Sydney, Albury, and Newcastle, which have afterwards been connected with the main triangulation. These were founded upon bases measured with steel tapes, and the comparisons of the lengths, made on connection, shows the reliance which may be placed upon such tape measurements when conducted with only ordinary care. Elsewhere in this paper the main triangulation only is treated of ; the large amount of minor work done may be estimated from the accompanying map (marked “C”) which illustrates the detail triangulation of one of the counties on the south coast. The whole extent of the survey is shown roughly on map marked “ D,” the part covered by the primary triangulation being distinguished by cross-hatching. ASTRONOMICAL OBSERVATIONS. During the progress of the survey, astronomical observations of the latitudes and longitudes of a number of stations have been made, and the azimuth of the work has also been referred to the astronomical azimuth at a number of places. The stations at which these determinations have been made are distinguished by special symbols on map “A.” At each station visited the horizontal direction of the magnetic needle is observed, but no measures are made of dip or intensity, the other two elements requisite in investigations of the earth’s magnetic force. LONGITUDE OBSERVATIONS. The adopted longitude of the initial point of the survey, the Sydney Observatory, is 10h. 4m. 49°54s. east. This is the value deduced from the connection between Australia and Asia effected by Mr. Barrachi and Captain Darwin in 1883 when the difference of longitude, Port Darwin to Singapore, was observed and the connection of Port Darwin with Sydney was made. Since the adoption of this value, other determinations of the longitude arcs on the chain between Singapore and Greenwich have been made, notably that recently completed by Captains Burrard and Lennox- Conyngham, which gives a value for the longitude of Madras differing by —0-308s. (4:62”) from the value, 5h. 20m. 59:42s., used for fixing the Australian longitudes. New measures of this kind, of course, affect the Sydney longitude, and must be taken into account whenever a re-discussion of the subject takes place, but any alteration at present, to accord with these later determina- tions, is to be deprecated ; in fact, considering the many and remote causes of error in longitude observations over long lines, it oO 210 PROCEEDINGS OF SECTION A. is thought that alteration should be deferred until more definite steps, either by improvement of methods or more reliable observa- tion along the whole chain, materially add to the weight of evidence before us. The accompanying map (marked “K”) shows the positions of stations, the longitude of which with respect to the Sydney Observatory has been determined. Some of these have not been connected with by triangulation, and their places were fixed mainly for use in the construction of a map of the colony to take the place of one which has been in use for the last twenty years or more, and in which errors of as much as 8 or 10 miles have been revealed by the trigonometrical survey. The method of observing difference of longitude generally adopted in the United States and other countries has been somewhat varied in this Colony, and now it consists practically in causing the clock at (say) Walgett to record on the chronograph at Sydney, whilst the Sydney clock is recording on the same chronograph, and then the Sydney clock records on the chronograph at Walgett, whilst the clock there is recording its seconds. In this way it is possible to get the difference between the two clocks within a hundredth of a . second, and the problem is reduced to obtaining the actual clock errors at the time of comparison, and thus the difference of the time at the two places at the same absolute instant, and herein lies the whole difficulty. A programme is prepared of stars in groups of three or four, at or near the zenith, and one or two circumpolar stars, one if possible, being swb-polo. For this purpose those stars only are used whose right ascensions are well determined. It is necessary that the intervals between the stars should be as short as possible, so as to eliminate unknown variations in the chronometer rate. When possible the level is read, reversed, and read again just before and after each star. The times of transit of the stars over the wires are recorded on the barrel chronograph by the observer pressing the signal-key, every individual second being automa- tically “recorded by the chronometer. The instr ument is now rotated through 180 degrees, and another group of stars observed as before ; any error in collimation, and also inequality of pivots, is thus eliminated, and a mean of the two corrections deduced from these two groups is the clock correction at or about the middle time of all the observations. This process is repeated with two other groups of stars, and then, if practicable, clock signals are exchanged with Sydney. The observations then pro- ceed in same manner; that is, a group of stars, instrument reversed, another group, instrument reversed, and so on, until, if possible, a second exchange of signals is made, when two or more groups will close the evening’s w ork, A single night’s work (says Chauyenet), however, is not to be regarded as conclusive, although TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. Paull a large number of stars may have been observed and the results appear very concordant ; for, experience shows that there are always errors which are constant, or nearly so, for the same night, and which do not appear to be represented in the corrections computed and applied. Generally, signals were exchanged with Sydney on from three to five nights. LATITUDE OBSERVATIONS. The astronomical observations for latitude are made by the method of zenith pairs, the altazimuth being fitted also for use as a zenith telescope ; thus we have combined in the one instrument the means of determining latitude, time, astronomical azimuth, direction and elevation of surrounding points. Results of the observations for latitude at one station, Walgett, are given below. Latitude— Walgett. Zenith pairs. Observed by W. J. ConDER. “ Mean Date. Stars. Ohad Mean. Vn ie | v. ve, 1884. 30° 1’ 30” 18 Oct.| Cape 11,3441—11,400) 1°7 Ne) 5 ae a rr 1128} 20°; ” ” ” 2°93 506 22 ;, ” ” ” 311 Sa0 23 ” ” ” ” 1°55 PHT 2-236 4°72 Ses », 11,428—11,448) 1:17 ae 19 ,, » ” ” 0°73 ° 20 ,, ” ” ” 2°90 21 99 ” 99 ” 0°86 22 5, ” ” ” 1°93 23 ” ” ” ” 3°10 n06 BoC Aen 24 ” ” a) ”9 2°18 1°84 2°646 4°87 19 ,, ” ” ” 151 20 9 99 99 ” 2:97 PAN oe ” ” ” 1°43 onic 22 ,, ” ” ” 2°26 Ade 23 ,, ”9 ” ” 164 90 24 ” ” ” ” STF 1°86 2°646 4:92 VO); », 11,476 —11,539| 2°94 ak 20S, ’ ” ” 3°58 ace 215; ” ” 2 2°54 22s ” ” ” Ze 5 23 ;, ” ” ” 2°88 an male 2b 5 ” ” ”) 2°35 2°88 | 2:449 7°05 OR. 3, 11,490—11,508} 0-25 ad e 20 ,, ” ” ” 2°08 | 74 l ”» ” ” 1:07 212 Date. 1884. PROCEEDINGS OF SECTION A. Latitude—Walgett. Stars. Zenith pairs—continued. Observed Mean’ Latitude. Vn Mean x Vn Vv. 22 Oct.| Cape 11,490—11,508 24 19 20 9 ” 29 be) be) 11,508—11,539 2) 2) 39 ” ” ” be) ” 11,567—11,587 bP) 9 3” ” ” ” > 9 11,567—11,610 be) ” 39 ” 3° 99 ” ” 3° ” 11,633—11,652 2° > ” 29 39 ”) oP) te) 11,707—11,746 33 3) 2? 99 29 ” 9 ” 11,783—11,799 LE) 33 be) 39 39 29 29 ”” 11,833—11,869 39 Le) be) br) 99 bed 11,919—11,961 30° 1’ 30” 2°17 SOSH KUANYNUDER GOK HMUWMHASDWARGAKRDES NN WWNNWNWNWHHHNHNONWWNWOWNMWWIwWNNNwWNwrrPnNlntdy WOON ERK HK ONO DOK HK OWOOR HNN ODDUANWANTUTIWODADUW-+10M WweSKKEK SE KROH 1-48 2-96 2-86 vs is a ‘i 7-00 “8 i “53 “in “35 30 “69 “Ol "42 “28 “37 "30 “io Latitude— Walgett. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES, Zenith pairs—continued. 213 Date. 1884. 20 Oct. Cape 11,919—11,961 9 ” Stars. 9) bed ” 11,991—12, 016 3? 12, 134—12,150 12, 150—12,197 3) 2) ” 9 12,220—12,270 12,297—12, 338 be) 2? 39 29 12,381—12, 420 2) 9 ” 9 9 99 ” 2) ” 2? 29 ” Observed Latitude. 30° 1’ 30” 2°88 1°85 3°17 2°57 1°63 AGSOHDMNO KUTA RAWS BO SHEN WWWWHEHOMNONNHENNHEWRNONWHENWHEH DN we toton POON M TAMA BR : re : SCOSABSHALWAADRSSSORE ERE WONUNDEBHGHSADEE DOM Mean. ng jes on Vn 2-449 2-449 9-449 Mean x Vn 5°93 5-14 6-00 5°44 5-46 “V1 “is ‘io “08 1-06 v. “Ol “04 “01 “50 “01 214 PROCEEDINGS OF SECTION A. Latitude— Walgett. Zenith pairs—continued. Date. Stars. Opened Mean. | Jn x A wv’. 1884. 30m S04 24Oct.| Cape 12,381—12,420) 2°87 BIN || PATA) | 2 7/40)7/ 85 72 20 ,, meng oui 343) = 2 be Ue 21 ,, ” 0 Op 1°88 22 ” ” DD OD) 2°91 23, he Pe 370) ee. he ees |i... 24 ,, ‘5 Paar Dsl 2°85) || 2°236 6°37 ae | ay WB} an », lll—164 3°01 ae ae A or se 24° Ap ne 1883 PPAlef |) die glet 3°07 14 02 DAL me », 132—l164 DRY. nae BS ae was 22 ” ” 2999 3°12 23 sae cde tas AcOR. Ain me i Pan | os a AS eS 272 3:05 | 2:000 | 6:10 74 13)5) a1. 990-268 1977 tee. _ Pee |” ao. 22 ,, ry) an SOD 2°66 23 |, : rn 3:07) al ee ie i ioe aa DN b eee 2°87 2°69 | 2:000 5°38 38 14 2, 5, 268—306 1°36 ae ae Aa as ae 22 ” ” 2299 1°66 5B i eens 222 |... ei 18 24%, .. ssa 1:58 1°70 | 2°000 3°40 ‘61 coil 21 ,, , 352—386 0-60 | ... i | 22 ,, ” MD Pp 1°76 23 ,, ae sa 1:85 | ... et a ef. D4 Rey me 0:50 | 1:18 | 2000 | 2:36 | 1:13 | 1:28 22 |, » 6352—401 Tedesco. i. cae ek ene IE Ne 192 |... a On| sia ae OA |, NS 0-65 | 1°30] 1-732 | 2-25 | 1-01 | 1-02 62°117 | 143-63 9:29 PSI Tatitude; 302 153231") PE -12.0108- MICROMETER VALUES IN LATITUDE OBSERVATIONS. From the mode of observing it is to be noted that the accuracy of the latitude results depend, to a large extent, on the value of the micrometer screw, and, recognising this, it was asked some time back that observations might be made to re-determine the value, for verification of the adopted one which rested on measures made as long ago as in 1882. As micrometers are so generally used in astronomical work, as well as in other branches of physical science, and since they are too generally relied on as being TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 215 little liable to any appreciable change, it is thought the errors found in this particular screw might with advantage be brought under notice. It is clear that micrometers in frequent use need examination at short intervals. In the reduction of the value of the revolution of the latitude micrometer screw it was recognised at the outset that there were certain peculiarities which demanded that it should have more detailed examination than is usually needed. The work, though apparently most carefully carried out, evidenced the existence of systematic error, which depended on the part of the screw used. The results show that systematic corrections need to be made to the micrometer readings. Each observation of time, after the first one of each set, gives an equation of the form aa+by+n=o0 where « is a correction to the initial observation and y is a small correction to an assumed value of the micrometer revolution. Substituting the resulting values in the observation equations, the residuals in the case of each set of observations exhibit changes of which the following, which are the residuals in the case of star Cape 1880, No. 6,703, observed 1896, February 19, are an example :— ee bee PhD iees 33 —1:29 26) — 0:09 19 +0°83 12 -0°30 32°5 — 1°40 25°5 — 0°31 18°5 + 0°36 11°5 0:00 32 -—1°47 25 +0°76 18 +1°57 1] -0-22 31-5 - 1:28 24°5+ 0°56 17°5+ 1°49 10:5 — 0°94 31 -—1'52 24 +0°47 Lyf ap llezes 10 -—0-64 30°5 — 0°67 23°5+1°17 1654117 9:5 —0°23 30 +0:17 23 +0°06 16 +1-12 9° — 0:93 29°5 — 1:09 22°5+1°40 15°5+0°52 8'5-—0°75 29 —0°38 22 +094 15 +0°06 8 -1°86 28:5+0°18 21°5+ 1°62 14°54 0°74 75 -—1°57 28 -0°'59 PA SE IL 14 +001 US aleils 27:5 -—0°76 20°5+0°81 13250219 6°5 — 1:33 27 -0°45 20 +1-77 13 —0'14 6 —1°16 26°5 — 0°41 195+ 1°69 12°5+0°80 The systematic nature of these residuals is plainly visible and is Shown throughout the observations, the set given being merely typical of what is revealed by all. So definite a curve is shown by all that it was clear that a system of corrections of the form x (20—R)’ could be determined, which would fairly represent the observed facts. Such corrections have been computed, the con- stant x being found to be 0’:014. These corrections, required at each micrometer reading, are as follows, the first column giving the reading of the micrometer, the second the correction in are, 216 PROCEEDINGS OF SECTION A. and the third the same correction in terms of R. The corrections for readings from 20 to 35 will be the same as those below, but in reverse order :— 122. u R. u 5 + 3°150 + 0°054 13 + 0°686 + 0012 55 2°940 050 13°35 O88 ‘010 6 2°744 047 14 ‘504 ‘O69 6°5 2°548 043 14°5 *420 007 ai 2°366 “O40 15 “300 006 75 2°184 037 15°5 280 005 ) 2°016 034 16 224 004 85 1°848 ‘O31 165 168 003 9 1-694 029 17 126 002 9°5 1°540 026 17°5 ‘084 ‘001 10 1°400 “024 18 056 ‘001 10°5 1260 021 18°5 028 “C00 11 1134 ‘019 19 ‘O14 000 11°5 1008 017 19°5 “O04 000 12 0°S96 015 20 ‘000 ‘000 12°5 0-784 013 It will be unnecessary to draw attention to the magnitude of these corrections ; they are sufficiently startling. They are, how- ever, fully borne out by the observations. For instance, to return to the case of star 6703 for an example, the observations of this star show that ten (10) revolutions of the screw in its different parts represent the following angular intervals : 10 R. 10 R. “1OR:. 34 -—24 588 62 27°5-17°5 589°53 21°5—11°5 585*66) ~ 17 33 —23 588°63 PH lly 589-01 21 —I1 585°39 32°5—22°5 591-08 26:°5-16°5 588°36 205-10°5 58552 382 —22 589°68 26 -16 588-49 20 -10 584°87 31°5-—21°5 590°18 25°5-15°5 588-08 19'5— 9'°5 585°36 31 -21 590°57 25 —15 586°58 19 - 9 58552 30°5-20°5 588-76 24:5-14°5 58746 185-— 85 586:17 _ 30 -—20 588°88 24 -—14 586°82 18 - 8 583°85 29°5-—19°5 590-05 23°5-13°5 585-92 17°5-— 775 584:22 A) il, 58849 23 =13 587:07 lyf = of 584°87 28:5-18°5 58746 22°5-12°5 586°68 16°5— 6°5 585°27 28 -18 589°53 22 -—12 586 04 16 - 6 585°00 The meaning of the above is that the result of measurement of an angle by ten revolutions of the screw at one part of its length differs by as much as 5 seconds from the result when another part of the screw is used. The effect of this error of screw on the observations ordinarily made with this micrometer (zenith distance observations for lati- tude) will of course not be so considerable as that just referred to, as it is usual to set the telescope as nearly as possible at the mean zenith distance of each pair of stars, so that the observations are made pretty symmetrically with regard to the middle reading (20 R) of the screw. This cannot always be done though, and in TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 217 fact seldom is done exactly, and whenever the readings are not equally distant, on opposite sides of 20 R, a correction is necessary. In one case, an exceptional one certainly, it was found that the difference of zenith distance required correction on this account by as much as 12”. Although the effect of such errors would be reduced by oriulsixedteien of many pairs of stars, as it would be improbable that the error of screw would have the same sign with each pair of stars; still it is shown clearly enough that this is a source of error to be reckoned with, and it is one which will most likely increase. As to its cause there can be little doubt. Seeing the thousands of measures made with the screw since 1882, when it was last xamined, the wonder would be if by now the effects of wear were not to be seen, and it is probable that wear zs the cause of the different values given by different parts. If, as in the present case, a screw is more frequently used in one part than in another, and one side only of its thread is subject to friction owing to the constant action of a spring, it seems patent that the consequent wear must ultimately result in an appreciable alteration of the position of the thread at the more used part relative to the thread at the less used parts ; the interval on one side of the used part being increased in length, and that on the other side decreased. Such action would entirely account for the defect observed in this screw. The middle of the screw is most used ; and the interval from the middle to one end is found to have increased beyond the value it had in 1882, while the other end has correspondingly decreased. TEMPERATURE EFFECT ON MICROMETER. The values of the micrometer revolution, as derived from the various stars, are as follows :— From star 72, R=58"°629 From star 8914, R- 58”°672 »» 6703, R=58""728 , 9273, R=58""806 5 16380, R=58"'634 re 2452, R=58"'552 The mean is R=58"-670. It is noted that though the theoretical probable errors of these values, arrived at from each individual set, are only + °007, +°006, +°"003, +-"001, +-’002, and +-”003, respectively, yet much larger differences are found between the above determinations. This points to a divergence of the con- ditions under which the observations were made, and it is to be regretted that in such observations the temperature of the instrument is not generally noted, in order that it might be ascertained whether that is a disturbing element. In delicate work of this kind some means should be found for ascertaining the temperature of the instrument, as it must change not only from the observer’s presence but from the effect of the actual 218 PROCEEDINGS OF SECTION A. applications of his hand to the instrument. The one temperature recorded was 35°; and if this was the air temperature, it is very certain that that of the telescope was much higher, after being touched as many as fifty times during the 20 minutes occupied by the work. In connection with the remarks on temperature, it is a some- what significant fact that the values given in the preceding paragraph seem to bear a direct relationship to the time occupied over the observations, the lowest value being given by the set which was the most rapidly made, and the highest by that which took the longest time. Arranged in order of time occupied, they are— Star 2452 ... R=58":552 Star 8914 .... R=58":672 3) L6307 2 R=587-634 > 0103 2.) "R58 728 ” he Wee R= 984629 os) 27d) San . R—OSe:806 So uniform are the progressions in time and value that it is difficult to resist the conclusion that there is a connection between them, and this is probably through the changes of temperature caused by the proximity and touch of the observer. DECLINATIONS OF STARS. The effect of errors in the adopted declinations of the stars observed is clearly seen in the latitude results, and wherever more reliable declinations have been applied they have been much improved. In connection with this it is apparent that a great work remains to be done, in combining the positions given in the various star catalogues; and attention may be drawn to the reduction, by Dr. H. 8. Davis, of the declinations and proper motions of stars required for the observation of variation of latitude at New York.* Dr. Davis has brought together for some fifty-six stars the work given in 130 catalogues, and so has obtained declinations of enormously greater weight than could be assigned to those given by any one observatory. For instance, in the determination of » Geminorum, the data afforded by no less than 1,748 observations has been availed of, yet in the previously published catalogues the largest number brought together in a form available for general use was 179. Though the observatories all over the world have been at work gathering information for many years, it yet remains to have the results combined. Rigorous reductions of this kind no doubt involve a large amount of labour, and it can hardly be proposed to at once enter on such a reduction of all the star places. A first step, though, might be made by subdividing the heavens into areas of, say, 5 degrees by 5 degrees, selecting the star in each subdivision which has been best * See Contributions from the Observatory of Columbia College, New York. No. 8. J. K. Rees, Director. Similar work has also been done by Dr. Auwers. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 219 determined in position (that is, observed at the largest number of different observatories, not the one all the observations of which, though numerous, may have all been made at only a few places), reducing its place and proper motion rigorously, and determining, by differences, the places of the principal other stars in the same subdivision, using the selected star as a point of reference. In this way the best information would be obtained for a large number of stars distributed generally over the sky, and the tabular positions of the remainder would be considerably improved with comparatively moderate labour. A very necessary part of such a work would be the discussion of the systematic errors of each observatory. AZIMUTH OBSERVATIONS. Astronomical azimuths have been usually found by observation of circumpolar stars at meridian transit. CONNECTION OF THE ASTRONOMICAL AND GEODETIC RESULTS. In a triangulation such as the one under review, extending from latitude 33° to latitude 37°, and covering some 3 degrees of longitude, comparison of the astronomically determined positions with those obtained through the terrestrial measurements afford a means of estimating the form of the surface covered by the survey, and, when combined with other similar works, of determining the dimensions and shape of the earth. The consideration of this subject is, however, very largely influenced by the existence of local attraction, by which the position of the apparent zenith at any place is liable to be deflected to the extent of several seconds of arc, owing to the irregular distribution of matter in the vicinity of the point at which the astronomical observations are made, and, even where the point may from its surroundings be apparently free from any suspicion of local attraction, the apparent zenith may be displaced. As evidence of this the following passage is quoted from one of our highest authorities,* who writes :—“ This amount indeed is often exceeded, and it is not uncommon to find, as in the vicinity of Edinburgh, a deflection of gravity to the extent of 5”, whilst in the counties of Banff and Elgin there are cases of still larger deflections, the maximum of 10” being found at the village of Portsoy. At the base of the Himalayas, where we should naturally expect a large attraction, it amounts to about 30”, diminishing somewhat rapidly as the distance from the mountains increases. A very remarkable instance of such irregu- larities exists near Moscow, brought to light through the large number of observed latitudes in that district. Drawing a line * Geodesy, Colonel A. R. Clarke, Oxford, 1880, page 228. 220 PROCEEDINGS OF SECTION A. nearly east and west through the city, this line for a length of 50 or 60 miles is the locus of the points at which the deflection of the direction of gravity northwards is a maximum, amounting to nearly 6” in the average, while along a parallel line 18 miles to the south are found the points of maximum deflection southwards. Midway between these lines are found the points of no deflection. Thus there is plainly indicated the existence beneath the surface, if not of a cavity, yet of a vast extent of matter of very small density.” The magnitude of some of the local deflections and the close accord between those arrived at by observation and those given by the triangulation of the Caucasus may be seen from the following list, which has been taken from a valuable report on gravity disturbances by Dr. Helmert.* It may be mentioned that in the same report the accuracy of Clarke’s elements is amply illustrated :— Deviation from the Vertical in the Caucasus. Latitude. D ea Name Longi- i Differ- F ; : tude. (Cone ence. Astronomical.} Geodetic. Observed. puted. ° , u” ie} / “ ° , Y u u Pestchanovkopsky | 46 14 45°81 46 14 48°70 | 41 6} — 2°89 0; — 2°89 TR UISSESV Ae merrcte etererecrs 45 8 1°97 45) 7 52731 41 56 + 9°66 + 10°83 —117 Jekaterinodar ....| 45 0 51:27 45 0 46°91 88 58] + 436] + 236 + 2°00 Georgiewsk ....:. 44 9 29°27 44 9 19°30 43 30 + 9°97 + 12:09 — 2°12 Ws NO? saan nb505007 43751) 22413 43 51 21:07 | 46 38 + 1°06 + 2°65 — 1°59 Jekaterinograd ....| 43 49 7°03 43 48 54°41 44 41 + 12°62 + 12°62 | Assumed zero. Alexandrowskaja..| 43 29 813 | 43 28 49°99 | 44 8) +1814] +1945 | —131 Wladikawkas...... 43 1 40°24 43 1 448 44 43 | + 35°76 | + 38°76 | — 3:00 PetrOwiske seen tee 42 59 36°7 42 59 18714 47 33 + 18°56 + 16°41 + 2°15 In our survey no attempt has been made to estimate the deflections due to irregularities in the distribution of the adjacent surface matter, owing probably to the labour involved in making the necessary topographical surveys, and also to the doubt which exists as to the radius within which such irregularities may be considered as having effect. Allusion has been made, when dealing with the altitudes of the stations, tothe advantage which would be derivedfrom theexistence of a photo-topographical survey in default of amore accurate survey, but in connection with the determination of the distribution of hill masses in the neighbourhood of the stations at which astro- nomical observations have been made such a survey would also prove of the highest value. In the absence of any means of correcting for the local deflections of the zenith, it is certainly * Comptes-Rendus des Séances de la Commission Permanente de l’Association Géodésique Internationale, 4 ’Observatoire de Nice, 1887. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 221 advisable to follow the plan urged by General Walker* and Dr. Gill.t The latter uses the following words :— “The method of employing groups of neighbouring astrono- mical stations instead of isolated stations is unquestionably the best plan for dealing with the difficulty. Having regard to the fact that the probable discordance produced by deviation of the plumb line is far greater than the probable error of an astro- nomical latitude as determined by observations of a single night, it must be always more advantageous to observe for latitude on a single night at each of five or six stations in the neighbourhood of a principal point than to make a long series of observations at any one point for the purpose of securing an accuracy in the determination which is in great part nullified by unknown local attraction.” “And if this be true for meridian arcs, as General Walker’s results (loc. cit.) have abundantly proved to be the case, it must be equally true for longitude stations. Every principal longitude station should therefore be surrounded by neighbouring stations for the purpose of eliminating, or at the least diminishing the effect of local attraction. The establishment of a longitude station is an incomparably more laborious and costly matter than is that of a latitude station ; it involves, for a like accuracy, a larger number of observing nights, an exchange of instruments and observers, and the cost probably of special wires, thus the labour and cost render the method practically prohibitory.” But the same end can be accomplished in a much simpler and more accurate manner by means of azimuths. Whatever informa- tion as to the amount and direction of local attraction can be derived from observations of longitude, the same information can also be derived from azimuths. If each principal longitude station was surrounded by six symmetrically placed astronomical stations, the lines joining the stations would form a regular hexagon with a central point—a figure which is the most favour- able possible for accurate geodetic measurement. If the astronomical latitudes and longitudes of these points are then determined, we have, from a discussion of the discordances between the geodetic and astronomical results of the figure, all the requisite data for computing the local attraction at the central point, or rather, we secure all the advantages which would result from a group of seven latitude and longitude stations. This method would be entirely free from the objection which can fairly be brought against the use of azimuths as a substitute for longitude operations, viz., the accumulation of error which is inevitable in long chains of triangulation. * India’s Contributions to Geodesy. by General J. T. Walker, R.E., C.B., &c. Phil. Trans., Vol. 186, pp. 778-787. + Report on Geodetic Survey of South Africa, 1896, already cited. 222 PROCEEDINGS OF SECTION A. “The advances made in the construction of modern instruments, and the employment of modern methods, render the execution of such a plan far less troublesome and costly than formerly would have been the case. An instrument like the 10-inch Repsold theodolite, with its observing hut and observer, can be con- veniently transported in a spring-cart with a pair of trotting horses, the hooded cart forming a sleeping place for the observer when necessary.” “Taking from the data, the probable accidental error of a single measurement of the difference of zenith distance of a pair of stars as + 0”:40, and for the probable error of the tabular declination of each star + 0:50 we have for the probable error of latitude, determined from the single observation of a single pair of stars. V/ (0:40)? + 202)? = 07-54 Thus from sixteen pairs of stars, observed on a single night, the latitude can be determined with a probable error of + 0"-14 a result which is at least ten times smaller than the probable deflection of the plumb-line at each station.” “The probable error of azimuth from a single night’s observation, derived from all the azimuth determinations made with the Repsold theodolite at Port Elizabeth, Hanover, Kimberley, and Tygerberg is a=07-30 or if the result from the azimuth determination at Port Elizabeth (the first station at which the instrument was used) be excluded, the probable error of azimuth from a single night’s determination becomes sal) k and this accuracy is abundantly sufficient.” With an instrument and observatory thus easily transported and erected (the same instrument being also available for measure- ment of horizontal angles) and capable of giving results of all requisite precision from the observations of a single evening, the construction of a latitude and azimuth hexagon about each longi- tude point would be a simple and inexpensive matter compared with the labour of and cost involved in the astronomical deter- minations of the longitude of the central point, and would give a sevenfold value to the geodetic results. ASTRONOMICAL AND GEODETIC RESULTS. In places where investigations have been made it has, however, been found that, notwithstanding such abnormal deflections of the vertical as have been referred to, a discussion of the geodetic data in connection with the astronomical observations, where these are TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 223 judiciously spread over the area surveyed, gives, as a rule, a fairly approximate value of the local disturbances. Such a discussion may therefore be concluded to afford a means of arriving at the general shape of the surface, independently of a consideration of the purely local effects, provided that sufficient observations have been made. From such a treatment the spheroidal figure best according with the measurements made in the survey of Great Britain and Ireland was determined, and a similar examination has now been made to ascertain the spheroid best representing the surface of this country. The following tables show the astronomical latitudes, azimuths, and longitudes at the observing stations, as well as the differences between these and the similar elements deduced from the triangulation. Geodetic and Astronomical Data. LATITUDE. Station. Geodetic. Astronomical. G.—A. ° , u" ° , u Obsenvatonry, ....cnse0ssc0e: 33 51 41° 1 |83 51 41° 1 | (assumed zero) CEM Obre ceectttaccmecea scat 32 59 10:24 11:23 —0°99 Wrarrawolongs...cn.9-06 <0: 33 2 44:89 43°90 +0°99 IMIATOOGAY concn esceeasese cen se 38) 28) Bethy Doo —1°58 WONT ELE since nacsjeosite povens- 33 26 19:05 16°79 +2°26 Wastlew an castanmsccedeeseta xc 33 42 26:28 26°93 —0°65 Basesshichids Nev socecssescee 33 35 58:07 58°84 —0‘77 IBAsesEMICHGe SS. seaeneese cee 33 39 44°63 44°99 —0°36 OUT tects seve cde tee voiist 33. 330 (7°71 8°83 —1°12 SCOUbinE soe stenceecnsere en aan BB) ay BAY) 4°33 —2°'14 Bal dieawenr sant sneriessaicdes. 33 26 52°42 52°06 +0°36 Bind Omens were tesce vssvcnsons 33 40 44°57 42°50 +2:°07 ILE OF Diss caenconapodeoadeoone: 33 28 24:04 25°37 —1°33 WOW ESE cecescccnicslersuesenes SOOO MOlESL 25°04 +6:27 (OKWENY Scape nce iconn te anen tees 33 24 46°67 46:22 +0°45 OW aT dlenyceuscmasecncosessar: 33 49 13:90 18:07 —4:17 Buttalope ness necseastesediasses 34 34 54°81 50°95 +3°86 WYoronora “.1c...-.s- mee 34 7 5:98 5°39 +0°59 ellone tee ccrcsccecncee nen sce 34 22 16:99 12°80 +419 Gilonaltarceecessrsececencest: 34 28 2:09 27 +59:09 +3:00 TOW MAM Fs seceineiarescsisssieyin, ass 34 45 21°36 20°38 +0°98 Allianoyonyiga ............ 35 2 22°57 23°50 —0°93 Basen Geon Sevceccuccees Bis eh Sey 19-26 +3°21 AGITMANATI ON sate seiewisliee cela 35 45 2:24 0:98 +1:26 Wimarallaas.cneceres.maesc: 36 11 56-01 53°83 +2-18 Wiamlbrookeeeeesceseree 30m LIE opR24: 36°17 —0°93 @oomMaeankeorcesnceceoneee 36 15 13°40 11°94 +1°46 LUG Sone gasctsck cnin ease 36 26 35°60 35°77 —0°17 IN( ESTOS: “Gaesonuscecsnoatoacec 36 37) «65°74 9°12 —3'38 Bakalong so c.ccs.acsecse-csee 36 48 28:07 31:07 —3°00 Substitute ..... “Ae ancroenter. 37 «10 «33°40 38°40 —5-00 eN@mialatecscesctinise: casnesens 33 32. 45°44 45°96 —0°52 224, PROCEEDINGS OF SECTION A. Geodetic and Astronomical Data—continued. AZIMUTH. Line. Geodetic. Astronomical G.—A. fe} / Ww ” Yengo—Warrawolong .........-.00e 99-50 12:12 3°73 —1'61 NIKO OLA CASELE saecleecesienrenemeaae WS, 48) (59512 58°60 + 0°52 Gastle=— Rede gcenscasceneeeeceeeeeeeeee 129 30 28°84 28°76 +0:08 Base, Richd. N.—Meridian mark.) 180 0 1:13 0°49 +0°64 Base, Richd. S.—Mulgoa ......... NOG ei, 42°22 40°03 +2:19 Pound—Base, (Richd= Ss varceneueo 184 52 8:79 6°10 + 2°69 Bald Momialhy eee acenhcaccenecdeetee 1122). 1.26 732:29 31°49 +0°S0 Bind o—= Lambie wsuatseeressesceaiee 35) 5 30°08 32°27 —— 919 Lambie—Meridian mark ............ 179 59 57:48 60°S4 3°36 Mowes=—lamlbteraanereseteeeceeteeeeee HL 25) V3ieo4 44-28 —6'74 Ovens= Wamibierneescceneereeeanceeeer 108 48 20°89 29°54 —8'65 Macquarie—Howard ..........00655 211 30 39°55 49°41 —9°86 Howard—Meridian mark............ 179 59 51:08 59°16 —S8'08 IN@rrEawa—bultall Omeeeccceeeseee ees 998 4 24-99 29°86 —}'64 Buffalo—Meridian mark ............ Wi) 53) BioreY 62°16 —}5'84 Gannon— Lott saa.ccesewosseteerececes 316 53 0°38 1:70 —1 32 Gibraltar—Meridian mark ......... 179 59 45°31 43°01 +2°30 Allianoyonyiga—Meridian mark..| 180 O 1:12 |— 0°26 +1:38 Base, L. Geo. S.—Meridian mark.| 179 59 59°54 5702 +2°52 Ofer la hiolsyorn — pacaqansannooneor 218 4 42°58 32°24 +10°34 Wrantbroolk—Clear 22. ...ccceceesesers 25 10 7.02 10°13 +6°'88 Eid son-—=Uimanalilanaesesaceccsesecaces 38 13 8:29 0°89 + 7°40 INummola—“Enud Soni weceeeeesesteeseace: 62 19 27:11 19°17 +794 Bukalong—Substitute ............. 182 56 18°32 O77 +8°55 Substitute—Tingi Ringi ............ 295 30 26°84 14°91 +11°93 LONGITUDES. Station. Geodetic. Astronomical. G.—A. ° ' uv ° 7 ” | 1 & ony rto | een een Ne eaccnGaetic 149 3 20°460 17°505 +2955 Tambien icnaesasccwnceccnart 149 59 24-600 25800 —1:200 Coomanencee, toueeeoecene 149 4 47°384 50°10 —2°716 (Oo Bueesecdeeoosdn|| = Ssonsccenoon 151 12 23:10 | (assumed zero) Tt may be here remarked that in the latitude observations the annual variation of latitude has not been allowed for ; as, although its existence has been verified, its amount and period cannot as yet be considered as ascertained.* Effect from this cause upon the results obtained in the calculations about to be referred to will, however, be inappreciable. * Since the above was written, Dr. Chandler’s determination of an expression for the variation of latitude has been published. Dr. Chandler's value seems likely to need little f any modification, but it has not yet been used here. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 225 RELATION BETWEEN ASSUMED AND ACTUAL SURFACES. It may be shown that the effect of projecting the points of a triangulation upon a spheroid of reference which must, by the method of the problem, differ only slightly from the actual spheroid, will produce differences which are only of the second order in comparison with the inclination of the surfaces to each other, and further, that these differences are so small as to be overwhelmed by other sources of error. Supposing, therefore, that € and 7 are the inclinations between the surfaces at one point, € in the direction of the meridian, and 7 in a plane at right angles thereto, we are enabled by a comparison of the astronomical and geodetic positions to express the € and 7’ belonging to any other point in terms of € and y, and, by determining a set of elements for the earth’s figure, such that the sum of the squares of all the £s and 7’s is a minimum, we arrive at the most probable shape of the surface. From this treatment there result for the latitude, longitude, and azimuth observations, equations of the following forms :— f@=xn +AE+By+ Cu+Etnv sec fy =x + A'E+ By + Cut Ev tan f'n = «6 + A”E + Bn + Cu + E’v in which zw is a correction on the assumed value of the major semi- axis, and v a correction on the eccentricity of the elliptic meridian. DIMENSIONS OF MOST PROBABLE SPHEROID. Sixty-eight equations of the above form have been obtained, from which, allowing the same weight to the longitude and azimuth equations as to the latitude equations, normal equations are got by the method of least squares, the solution of which gives the following values :— € = — 0:45"; » = — 1:39"; w = + 0°550; v= + 1518. With these values the elements of the spheroid would appear to be :— a = 6974378 + 1861 yards; e? = :0073875. From an examination of the data we would be led to expect that certain systematic influences would to some extent affect this result, for it will be seen that in following the triangulation net westerly from the Richmond base the Dividing Range is crossed, and at all stations between Bindo and Buffalo the general in- fluence of the mountain mass is shown by an easterly deflection of the plumb line ; also in the southerly extension from the Lake George base a similar deflection of opposite sign is shown, re- sulting from the triangulation being located on the eastern slope . of Monaro with the high mountain mass culminating in Mount Kosciusko, the highest point in Australia, lying to the westward. Pp 226 PROCEEDINGS OF SECTION A. Again, too, the question of the relative weights of the azimuth and ‘latitude observations are to be considered. It must be ad- mitted that the equations to the latitude should have greater weight than either those connected with the azimuth or with the lon gitude observations, having in view the facts that in the azimuth equations are contained any errors occurring in the transfer of directions through so many different points, and that from the nature of the longitude observations results of like precision to those given by the latitude observations cannot be looked for. The actual determination of relative weights to be applied to each is, however, somewhat difficult of solkidarne and must, to a large extent, be a matter of opinion. As judged though by the very small errors of closure of the triangles, it would seem that the error in carrying on azimuth must be relatively small, and that the difference of weight to be assigned to the different classes of data should not be so great as would, at first sight, appear to be demanded. Allowing half weight to the azimuth and latitude observations, and omitting those azimuth observations which have been above referred toas being influenced by systematic attractions and likely to unduly affect the results, it is found that the values of & y, etc., become € = — 0-44", y = — 0:93", wu = + 0:395, and v = + 1-147. From these are obtained— . a = 6974378 yards + 1336; e? = 0072080. These elements, it will be seen, more closely approximate to those which were assumed for the spheroid of reference, and it is not unlikely that even closer agreement will result from the further extension of our tr iangulation northward. It is necessary to add that all lengths arrived at are in terms of the standard bar used in the base measurements, the length of which, in comparison with the standards of other countries, as has been before mentioned, is well determined by Colonel Clarke’s observations. The information respecting such comparisons is of great value, for it will enable the triangulation of this Colony, which is in a latitude peculiarly favour able for the purpose, to be combined with those of Europe, where the subject receives con- siderable attention, surveys of high precision being now extended over the whole of that continent. While the results given above may be expected to indicate with fair precision the shape of the surface covered by this survey, combination with those of other countries is necessary for obtaining a fair value of the dimensions of the earth as a whole. No account of this survey would be complete which did not pay some tribute to the skill, as an observer, of the late Mr. W. J. TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 227 Conder, to whom is due in a great measure the high degree of precision attained. The names of Messrs. P. F. Adams, late Surveyor-General of the Colony, and H. C. Russell, C.M.G., F.R.S., must also be recorded in any such sketch as this. To the former the very existence of the survey is in a large measure due, and it owes much also to his wide practical knowledge and experl- ence, while the latter has, during its whole progress, aided in many ways where his scientific attainments were of the greatest service. QUEENSLAND. The extent of the triangulation effected in Queensland is shown by the accompanying map (marked F) from which it will be seen that it covers nearly 3 degrees of latitude and 2 of longitude. Unfortunately the further progress of the survey is held in abeyance, having been stopped some few years back, when the position of public and private finances alike demanded the stoppage for the time being of all expenditure not absolutely necessary for the maintenance of existence. As, however, our northern neigh- bours now find themselves in as prosperous a condition as they were then in the reverse, it is possible that this work, which is agreed on all hands to form one of the best means of securing economy in land administration, will be shortly resumed. The base line from which lengths are derived is situated at Jondaryan (see map), its whole extent of about 7 miles being divided into ten sections. It is upon an open plain, the terminals of which, Mounts Irving and Maria, are respectively 216 and 162 feet above the general level of the remainder. It was originally proposed that measurement should be confined to the plain, extension east and west to the hills named to be made by triangulation ; but experience gained in the measurement showed that the system adopted was capable of satisfactory application to the inclined parts of the line, and the slopes were accordingly measured also. The length was determined by two steel tapes, each 100 feet long, which were compared with a steel bar floating in mercury, carefully standardised by measurement against the standard bars of New South Wales. This bar had in 1883 a length of 99998581 feet at a tempera- ture of 62° Fahrenheit, but subsequent reference (in 1895) to the New South Wales bars would make it appear as though the Queensland bar was slowly shortening. The tapes were con- tained by wooden troughs to protect them from the sun and wind the troughs resting on pegs placed so as to follow the general slope of the ground, which was measured and allowed for in the computations. The tapes were kept at a constant tension of 20 lb. during use, and temperatures were obtained from five thermometers distributed along the length of the tapes, it being 228 PROCEEDINGS OF SECTION A. . estimated that the adopted temperatures are probably not more than one-fifth of a degree in error. Marks were made in copper discs inserted in wooden pegs driven into the ground at each 100 feet, the distances between the tape-ends and the marks being measured by micrometer microscopes. Three measurements were made with each tape, each one distinct and independent, so that every section was measured six times. For the whole base the difference between the means of the three measures with each tape amounted to 0-117 of an inch; a slightly greater difference than this was, however, observed in the corresponding measures of one of the sections—section 5. The lengths of the various sections were compared by triangulation, and calculating one- half of the base from the measurement, a difference of -936 of an inch was shown. The base-line work was executed by Mr. A. McDowall, the present Surveyor-General of Queensland, assisted by Mr. R. Hoggan. The instruments used in the angle measures were generally 10-inch theodolites by Troughton and Simms, read by two micrometer microscopes to a second of are, but at a few of the stations a 12-inch instrument by the same makérs was employed. From two to eight readings were made on each of eleven different parts of the graduated arc, the mean of the means in - each position being used. The following are the closing errors of the seventy-four measured triangles :— Closing error. Number of triangles. 0” bo: a? 29 I? the 22? 29 2” to: 3” 11 Upwards of 3” 5 The maximum error of close was 3:90, and, computing m from SACS ee ; : m =(= ye it is found to be (+) 0”°95. The triangulation has n been calculated with elements given by Colonel James in the account of the Ordnance Survey of Great Britain in 1858. The astronomical datum is the position of the station at Jimbour, as determined by Captain Morris, R.E., and Lieutenant Darwin, when observing the Transit of Venus in 1882, the longitude being measured by telegraphic exchange of time signals with Sydney. Astronomical observations have been made at stations, Bloodwood, Brisbane, Haystack, and Mount Domville. The geodetic latitudes of these stations, minus the astronomical positions, give the results —-02, +117, +5737, and — 117, respectively, and the similar differences for the longitudes of the first two of the stations named are +657 and —-05". The azimuth datum was observed by meridian transits of circumpolar stars at station Bloodwood, and the latitude of the same station TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 229 was obtained by the Talcott method of zenith pairs, the other latitude determinations being by measurement of circum-meridian altitudes, and by prime vertical transits. In addition to the astronomical observations at the stations connected with the triangulation, observations have been made to determine the latitude and longitude of a number of other points, distributed over the area of the colony, and shown on the map marked F. In connection with the survey of Brisbane a triangulation has been made from a base 1,924 feet long, laid down in the Botanical Gardens. The base was measured twice with one of the tapes inentioned as being used on the Jondaryan base, and once with the other of the same tapes, a fourth measurement being made with a new tape. The angles were measured with 10-inch and 6-inch theodolites, and connection with the main triangulation shows differences of four seconds in azimuth, and about four-fifths of an inch per mile in length, representing a difference of about three-tenths of an inch in the length of the Brisbane base. The whole of the triangulation was in the executive charge of Mr. R. Hoggan, who was assisted by Mr. R. McDowall. VICTORIA. The trigonometrical survey of Victoria was preceded by a system of laying out on the ground, meridians and parallels of latitude, by which it was expected to rapidly meet the demand for land, which in 1857 the Survey Department found itself unable to cope with. The intention was to surround large areas by carefully fixed meridians and parallels, to subdivide these again into blocks of one-tenth of a degree in each direction, the further subdivision for alienation purposes being effected by contract. This work was begun in 1858 under the direction of Mr. R. L. J. Ellery, C.M.G., F.R.S., etce., the difference of longitude between Williamstown Observatory and the first meridian line being laid out on the ground by triangulation. The general course followed was to determine the direction of the true meridian by means of a transit instrument or an 18-inch altazimuth, placing marks in the direction of the true north and south at the greatest distances commanded by the observing station. These varied from 5 to 20 miles, but intermediate points were also marked where possible, the whole line being subse- quently run and, if on Crown lands, cleared and marked. For the chaining, the ordinary 66-foot chains were used, but distances were controlled by a subsidiary chain of triangles with sides of from 2 to 5 miles length, carried along the line from carefully measured bases. The intersections of parallels with the meridians were marked, and the parallels laid out both by offsets from chords and from tangents at right angles to the meridian lines, 230 PROCEEDINGS OF SECTION A. lengths along the parallels being, as with the other lines, checked by triangle chains, the angles of which were measured with 8-inch and 10-inch theodolites. After a considerable amount of this work was done, it was found that it was not proceeding expeditiously enough to meet the calls upon it, principally because of the inadequate funds set apart for the conduct of the scheme, and it was resolved to carry on a primary triangulation so as to reach the more distant parts of the colony, advantage being taken of a number of trigono- metrical stations having been marked for such a purpose a few years earlier by Captain Clarke, R.E., the then Surveyor-General. In 1860, therefore, a base nearly 5 miles long was laid down on the Werribree Plains, and measurement wasmade between January and May of that year, an extension of the base of triangulation to Green Hill, making the total length over 5} miles, being effected shortly afterwards. The actual measurement was made by the use of three iron rods, the lengths of which were ascertained by micrometer comparisons with the 10-foot ordnance standard lent by the New South Wales Government, a similar standard for use in Victoria being subse- quently obtained from the Ordnance Survey Department in England. The bars were fitted with steel ends, one flat and the other rounded to form a section of a sphere of 5 feet radius. They were used by being placed in series, with distances of about 4 of an inch between the spherical end of the one and flat end of the adjacent one, the distance of these two apart being obtained by passing a wedge between them until contact with each other was made, the position of the wedge at the time being read by graduations made along its length. The wedge was of hard bell- metal, 7 inches long by 2 broad and the inclination of the faces was 30 minutes. The bars were kept level during the measure- ment, change of height being seldom needed, as the difference of height of the two ends of the base was only about 14 feet. A re-measurement of part of the southern end was made following the slopes of the ground, and on reduction the co-incidences were such as to justify the assumption that by the original measure- ment, the Werribree base was probably as accurate as any measured up to that time. The total difference between the two values for the southern part was 0-308 inches, or about 0°15 inches per mile. The terminals of the base were marked in a substantial manner, and immediately on its completion, triangulation was carried therefrom to the Western district by Mr. A. C. Allan, Messrs. Penniger, Black, Petty, and others being similarly employed in other districts. Considerable activity was shown for some time, the greater part of the colony being within a few years covered with a first class series of triangles, the last operation of the staff being the demarcation in 1872 of the straight line from the TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 231 Murray to Cape Howe, forming the boundary between the colony and New South W ales. U Jpon this work, Messrs. Allan and Black were engaged, the triangulation for this purpose being extended to include ‘The Pilot ” and Mount Kosciusko in New South Wales. The triangulation connecting the ends of the line having been observed, the line itself was ranged on the ground to the calculating bearing with the gratifying result that it reached the coast within 7 inches of the marked terminal, a fitting tribute to the skill, energy, and endurance of those in whose hands the work had been placed. SOUTH AUSTRALIA. The first trigonometrical survey work in South Australia was that commenced in 1840 by Colonel Frome, R.E., Surveyor- General of the province, who, in the course of the three years following, observed a network of triangles extending over the hilly country—east, south, and north of Adelaide—from En- counter Bay to the head of Spencer's Gulf. His base was measured on the Adelaide Plains, west of the city, six inde- pendent measurements being made; the instruments used being a heavy steel chain of 100 feet length, and a lighter one 66 feet long, with brazed rings. The adopted length of the base was 17,462°20 feet. Only ¢ one end of it can now be identified ; but the brass standard then used for reference is still in a good state of preservation at the Surveyor-General’s Office in Adelaide. Observations for determination of the true meridian were made: at four stations, with an altazimuth of English make, by J. D. Potter, oyine a horizontal circle of 13 inches and a vertical circle of 6} inches. Latitudes were found by meridian observa- tions of the sun and fixed stars with the sextant, and several sets of lunar observations were also taken for longitude. The hori- zontal angles were almost all taken with 5-inch “Y” theodolites, reading only to minutes. Six or eight rounds of angles were observed (as instrumental bearings increasing towards the right hand) at important stations, and three rounds for subsidiary triangles, the vernier index being set differently for each consecu- tive set. Reciprocal angles of elevation and depression were also observed to the tops of all the stone piles which mark the stations, thus enabling their elevation above sea level to be calculated. The sides of the triangles range from about 6 to 16 miles, and the closing error of each from 3 to 10 seconds. Work of a similar character was carried out from 1857 to 1860, under the direction of Colonel Freeling, R.E., Surveyor- General, when, in order to fix the positions of pastoral leases in various localities, over 100 miles apart, several base lines were measured with ordinary surveying chains. Thus separate systems of triangulation grew from these bases, which, while securing 232 PROCEEDINGS OF SECTION A. their purpose satisfactorily, and possessing the merit of economy, were not connected in such a manner as to allow of exact com- parison of their respective base lines. The instruments used on these surveys were 7-inch theodolites, three rounds or sets of instrumental bearings were required to be taken with the vernier set at 360°, 120°, and 240° respectively. The length of the sides of the triangles ranged from 10 to 40 miles, and the closing error in some cases was as high as 15”. Shortly after Mr. G. W. Goyder’s appointment as Surveyor- General, the triangulation of the Eastern Plains and Gawler Ranges was completed. In 1873 by the exertions of Mr. A. B. Cooper, Deputy Surveyor-General, the survey of the outlying districts was con- tinued upon strictly geodetic lines, the forms of record and methods of astronomical observations adopted being similar to those of the Victorian Geodetic Survey. This class of work has been continued uninterruptedly for twenty years covering about 1,000 miles of country. Seven-inch theodolites have been chiefly used since 1873, but good work giving errors of only one or two seconds per triangle has been done with a smaller German theodolite by “ Ertel,” having four verniers and an excellent telescope. The latest base line was measured during 1880 on a level flat 500 miles north of Adelaide. It was measured eight times with deal bars, 10 links in length, brass capped, and twice with a steel bar of the same length, all standard according to the brass yard previously referred to. Numerous stout stakes were driven into the ground in perfect alignment and to the same level; a copper tack was inserted into every stake, and upon these the bars were rested, and a fine line drawn at the end of each. Two sets of measurements were made in summer and two in winter, corrections for temperature being carefully applied. But the wooden bars were found to shrink more than ;}, of an inch, involving continual uncertainty. The length given by the steel red alone, viz., 9,107:71 feet was, therefore, adopted. While the line was in process of measurement, angles were taken at appropriate distances to stations on neighbouring hills which afforded facilities for extending the line. Astronomical latitudes have been determined by meridian passage of stars with both transit theodolite and sextant, which differ from the calculated positions by from 2 to 16 seconds. Some of these discrepancies are doubtless owing to deflection of the plumb line, as the altitude of the country varies from a few hundred to over 4,000 feet above sea level, but no systematic effort has been made to determine the extent of disturbance due to this cause. The observations for azimuth are taken at every second or third station, either with a 7-inch “Y” or a smaller transit theodolite ; a set consists of six or eight observations of TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 233 circumpolar stars, many of these disagree with the calculated bearings by nearly a minute either way, the cause of which is believed to be largely due to an imperfect motion of the telescope in the vertical plane, although precaution is taken to reverse the alidade of the “ Y ” theodolite at each observation, and to change the pivot ends of the cross axis of the telescope every alternate observation made with the transit theodolite. For the purposes of calculation the angles of every triangle have been made to sum 180° plus their spherical excess by adopting the arithmetical mean of the best observed values, and solved as plane triangles. Only in special cases has the method of “least squares ” been applied. The greater part of the triangulation has been co-ordinated in portions for plotting purposes upon different planes, the meridians for which are connected with initial meridian of the Adelaide observatory ; and a wide circuit of geodetic latitude, azimuth, and longitude has been computed from these, Clarke’s elements of the spheroid being used for the purpose. In process of co-ordination it becomes evident that a polygonal figure of about a dozen sides, comprising a surface of 500 square miles or more, may be selected from any part of the more recent work, of which the angles, if mathematically treated, will not be found more than 5 seconds in error. The trigonometrical survey of South Australia now embraces about 175,000 square miles, having its greatest length in latitude 27°, stretching from the boundary of New South Wales to that of Western Australia, 740 miles, and between the parallels of latitude 36° and 26°, 688 miles upon the meridian of 139° east longitude. Particulars of Base Lines. Locality. Length in feet. Date. Oni therAdel ade WAM: se..c.Gra sec wovasecameeaees 17462:20 1840 INGarg Mites Ser eir...canhecitaahesscuecedandaomoamiaed 10560°00 1857 INBB got OrteAMeSta), sup ssidemasirttnssiewiasasce 23189°70 1859 INGE Olp Make SOTLEMS) secs ei cioio wes seresemierne eicieereee 105861°90 1860 INGA trae Na AMD) 9.) .orc:aersleesseiemtoliofioiionlaewien 58423 °20 1860 HasternyP anya rmen tecacmereasmesuaoen cacsennocear 42461°76 1862 HOO mn, Naf Adelaide s.icaccdeswewctesancseooes 9107°71 1880 From the above short account, which has been forwarded by Mr. W. Strawbridge, the present Surveyor-General of that colony, for the purposes of this paper, it will be seen that South Australia possesses a survey, the character of which speaks well for those in whose charge it has been placed. Though not, perhaps, carried out 234, PROCEEDINGS OF SECTION A. with all the precision necessary for the determination of the figure of the earth, yet for all the purposes, and they are many, of the management of the Crown estate, it is of the highest value. Its limits are indicated roughly on the map marked D, WESTERN AUSTRALIA. The trigonometrical surveying done up to the present in Western Australia consists almost entirely of long chains of triangles, embracing a very large extent of the western sea-board, and in some cases extending to a considerable distance inland. The section between Fremantle and Geraldton was observed some twenty years back, but the bulk of the remainder has been carried out during the last seven or eight years. Owing to lack of the slight additional means needed for undertaking an adequate survey, the angles have been measured only with small instru- ments, generally 6-inch theodolites, reading to 30 seconds, though at some few places 8-inch theodolites, reading to 10 seconds, were used, Work of this character, if viewed as preliminary to a survey of a better class, no doubt serves a useful purpose, as affording a frame-work on which to build the rough maps required in the early stages of the settlement of so vast a territory. It, however, cannot fulfil properly that function of a triangulation which, from an economic point of view, may be considered as one of the main ones, namely, serving as a check on the field work, so as to reduce to a minimum the cost of field inspection of the chain surveys. To serve that purpose it is imperative that the trigono- metrical survey should be indisputably better than the work it is to control. From another point of view, also, it is to be desired that, if undertaken at all, a trigonometrical survey should be carried out with greater precision. The question of the calcula- tion of the triangulation itself is what is referred to, for in work of such approximate nature it cannot but be found that on joining between the different bases and astronomical stations, discrepan- cies of length, azimuth, and position are shown of such magnitude that their proper distribution is beyond the reach of any systematic method of adjustment, so that appeal has to be made to some arbitrary means, always a most unsatisfactory resort. Six bases have been measured, viz., at Perth, Wyndham in the Pilbarra District, and on the Fitzroy and Ashburton Rivers. Their lengths were obtained by the use of steel wires, 66 feet long, fitted with knife edges at the ends, changes of temperature being observed during the measurement, and allowed for. Astronomical observations were taken at points about 200 miles apart, latitudes being determined by meridian altitudes of stars and azimuths by observation of circumpolar stars at their TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 235 greatest east and west elongations, but the instruments used were only the same small ones employed in the terrestrial work. The time is looked to, however, when the whole of the survey will be the object of a little more consideration from those in charge of the purse-strings, so that this extensive triangulation, which now, with only one small gap, covers nearly 19 degrees of longitude and 17 of latitude, may be made available not only for all the needs of land administration, but also may be made to contribute to our knowledge of earth shape and size. TASMANIA, The trigonometrical survey of this colony may be said to have been initiated in 1849, when the first measurements were made of a base line, nearly 4 miles in length, at Ralph’s Bay. Rods of fir, each 15 feet long, protected by a covering case and insulat- ing material, and fitted with brass caps at the ends, were used, and the general slope of the ground was followed, corrections for the inclinations of the rods being applied. The brass caps of the ends of the adjacent bars were brought side by side, and a scale fitted to one was read by a vernier engraved on the cap of the next bar. The lengths of the rods were ascertained by comparison with a 4-foot steel standard divided into inches and fortieths, comparisons being made from time to time during the operations. This was, at the time, the only standard in the colony ; but shortly afterwards a 10-foot steel bar was obtained from England, and on the older one being compared with it, the two were found to be in such very close agreement, that Major Cotton stated in a report of his on the subject in 1852, that the measurement required no reduction on this account. This later standard was one of those employed in base-line measurement for the Ordnance Survey of Ireland. Its length, therefore, may be assumed to have been well determined. The same base was afterwards measured twice in 1851, when the earlier results were found to differ from the mean of the later, by about 10 inches; the mean of the later determinations, over which greater precautions had been taken, and which differed only by slightly more than an inch, was adopted. A base of verification nearly 5 miles long was measured twice by similar means, at Longford, on the Norfolk Plains, the two measures differing only by 3} inches. The bases, which were about 100 miles apart, were connected by a system of triangles, the angles of which were measured by repetition with a 12-inch altazimuth graduated to 10 seconds. The greatest error of close on this system was 3:3, a result which points to the accuracy of the instrument and to the care taken in making the observations. A further proof of the accuracy of the work is given by the fact 236 PROCEEDINGS OF SECTION A. that the measured length of the Longford base was found to differ only 3} inches from that derived through the triangulation from the original base. The principal triangles of this system are very well conditioned ; but the same cannot be said of those by which connection is made with the bases. A large number of other triangles were observed with the same instrument, the error of close generally not exceeding 2 seconds, and at every principal station angles of elevation and depression were observed for determining the heights. The datum for the calcuiation of positions is at Hobart, the latitude and azimuth at this point being determined by observa- tions of o Octantis, and by observations of a number of other circumpolar stars at greatest elongations. At four other stations the latitudes and azimuths were determined simultaneously by elongation observations, the differences between the observed and geodetic results being as follows :— Station, teal |) eee DEOMEMABY? <..5.0.secsiascsccsiseoeeceens 42 42 38°8 42 42 38°27 | — 0°5 Browne Mountain, Jace seciemeriersacene 42°36) Tl 42 35 48°67 | — 19°0 Alem Viounibalneecnereeeecrccrscnecsces 42 14 28°9 42 14 7:43 | — 2ilk5 MoMertSmB liz c-cacccsenmecerenetencncs 41 56 18:2 4456 P37 —= 7A ° Astronomical Geodeti Diff Lines. He yp Sotba rs [simu ° , u” ° ! uw u Dromedary—Brown Mountain 69 23 19°4 69 23 30°8 | + 114 Brown Mountain—TableMountain| 321 30 11°8 SyAl GOesBIe, | + 21°4 Table Mountain—Brown Mountain| 141 46 13°2 14] 46 21:4 | + 8:2 Miller’s Bluff—Table Mountain ...| 184 52 21:0 184 52 35°5 | + 14°5 The method of latitude determination was not the most satisfactory, but modification of the results on that account would necessarily be small as compared with the above differences. It would thus appear that either the elements of the earth’s figure TRIGONOMETRICAL SURVEY OF NEW SOUTH WALES. 237 assumed in the computations do not well represent the surface of Tasmania, or that there are considerable local deviations of the vertical. Possibly both these causes contribute in some degree ; the latter may certainly be expected to have effect from the rugged nature of the country covered by the survey. The writer is unaware of the elements adopted, but in some of the computations appended to Major Cotton’s account of the triangula- tion, read in 1855 before the Royal Society of Tasmania, and from which much of the above information has been drawn, a mean radius of 20,887,457 feet has been used. The whole of the survey, it should be stated, was executed by Mr. J. Sprent, under Major Cotton’s direction. For some thirty years or more no other application of the trigonometrical survey appears to have been made, than by its aid to construct a framework for the projection of a map of the Colony, and on one occasion at least its general accuracy has been assailed, for reference may be found in the Tasmanian Royal Society’s Proceedings, as lately as the year 1881, to its having been challenged by the late Mr. Calder, a former Surveyor- General of the Colony. However, the opinion expressed by Mr. Black, of Victoria, when, in 1883, reporting on the system of surveying in Tasmania, seems a most feasible one. His view was that ‘It is quite possible that the erroneous character of much of the topography of Mr. Sprent’s map may have given rise to the impression that the whole data is worthless ; but it by no means follows that this is the case because some person evidently imperfectly acquainted with the country has sketched the features incorrectly.” Some attempt has recently been made to put the triangulation to some service, and during the years 1884-6 some forty of the stations were rebuilt. Many others, however, are, it is understood, not now recoverable. The cause of its having fallen into desuetude was no doubt the fact that it was not combined with a sufficient amount of minor triangulation to enable proper connection of the chain surveys to be made, without having to run traverses for long distances, and often into country presenting the greatest difficulties in the way of chaining. The advantages offered by a trigonometrical survey have now been fully recognised, and some five base-lines have been measured for the purpose, doubtless, of carrying out any future extensions on the New Zealand scheme of initiating purely local systems which become eventually joined into one comprehensive survey of the whole country. AUSTRALASIAN Assoc. Abv. Sc. VoL, VII, 1898. “A” PLATE IV. Map MAIN TRIANGULATION __New South Wales » longitude _ The Trigonometrical Survey of N. 8. Wales. By T. F. FURBER, F.R.A.S., LS. AUSTRALASIAN Assoc. Ady. Sc. Vot. Vil, 1898 PLATE V. ce B 9 Longitudinal Slide Pian of Douste Microscope Pram or Diaruracm Showing pesitros of Hairs (ross Slide Stoe Evevation of Douate Microscope Tube in Section The Trigonometrical Survey of N. 8. Wales. By T. F. FURBER, F.R.A.S., LS. AUSTRALASIAN Assoc. Abv, $c. Vot. VII, 1898. = PLATE VI. SISA} SOIMARAURENAEHA NN) ng CU AI Drawinc N°] Showing posuion of Double Microscope over Measuring Bar. eur TTA ——« =Duection of measurement This Box contanng Measuring Bar he i ’ is capable of beng adjusted in all directions by screms for the prupose. _ ae a2 The Trigonometrical Survey of N. 8. Wales. By T. F. FURBER, F.R.A.S., L.S. PLATE VII. AUSTRALASIAN Assoc. Apv. Sc. VoL. Vil, 1898. ehy a 7 —- t és é Wie > arte f y S74, \/ ry Ldp Pe eZ 2 r = be Na The Trigonometrical Survey of N. S. Wales. | By T. F. FURBER, F.R.A.S., L.S. A zy y NN AUSTRALASIAN Assoc. Aov, Sc. VoL. VII, 1898. CD ae PLATE yt, NORTHERN TERRIT RY % | san 0 Primary Triangulation shown thus ; AUST RALIA ——__| oN Secondary do do do Wh shewing Minor to do do Will __ Areas of Triangulation — Positions of Base Lines do do @ The Trigonometrical Survey of N. S. Wales. By T. F. FURBER, F.R.A.S., LS AUSTRALASIAN Assoc. Apv. Sc. VoL. Vil, 1898, (a; | ae PLATE IX. MAP shening LONGITU, Nv mOLATITODE swe 7 LAND NEREEA TOW @ | * on ceromy al TOWNS Yiteg XE We sone ey | CARTERS Tomens® ah HM OND e MC NEN OLY ea ly aes SLANID 920% Rae “LoNCUR RY ° w ai Es. PocH, 2) “aed gM e SLICTHL 7AMBO @ @ANtr4L 74#00n e WARE 4V/LLE® © 70K, | Stray e } 2, COMA ita e | 2; “one } Ona ning, OA au, Awe naaas, a — a Paicerr | S00 RAF rik O r r NEW SOUTH Wallns © Cdr 14 PASALY SELLER | COaag e | 4k Ry SURNS i ‘BAR / °HLW/ N26) W880 e L277 SORA B/L WANN OE lenge “MDOP OL) *rooncaere DCF Oy NENT HORT) SALAM oO sr = rn, 4/ COR / A MELBOURNE Moke {AM B/E | MAp a a ® 0NyG %, VAAN DENS Who L4 p STATIONS Si Ie By Ife F. FURBER, F.R.A.S., [eS: AUSTRALASIAN Assoc. Apv. Sc. Vot. VII, 1898. “pe PLATE Xx. TRIGONOMETRICAL SURVEY oF QUEENSLAND The Trigonometrical Survey of N. 8. Wales. A NEW TIDE-PREDICTING MACHINE. 239 No. 5.—DESCRIPTION OF A TIDE-PREDICTING MACHINE. By Captain A. INGLIs. (Read, January 10, 1898.) Tus machine differs from any other one that I know of in its requiring only one set of gearing. The principle on which the machine is founded is as follows:—A number of wooden tem- plates are cut, each in the form of a sine curve, representing one of the tidal components; these waves are of different lengths, but are all pushed along vertically side by side at the same rate, being supported by a frame or carrier moved forward by a rack and pinion. A number of vertical plungers rest in a line on the top of these templates, and are moved up and down as the curves progress forward. The motion of the plungers are then com- pounded by means of a fine wire passing over pulleys at the top of each one, and under fixed pulleys between adjacent ones. The compound portion is then communicated to an indicator, which moves up and down alongside a vertical scale. The forward movement of the carrier on components moves the clock, which indicates the time. Thus the time and height can be read off at once. GENERAL Description.—The machine consists of a rectangular frame, 4 feet long, 29 inches wide, and 10 inches high; in the lower part of it is a groove in which the carrier moves. Across the top at the middle of the frame is a beam with vertical slots in it for the rods or plungers to move up and down in, between each slot in the beam a pulley is fixed. In front of the beam is the recorder with a scale on it, in this recorder is a traveller, which carries a pencil on one side and pointer on the other, the one for tracing the curve and the other for showing the height on the scale. In front of the frame, between it and the recorder, is a vertical slide holding the paper on which the curve may be traced. The carrier is a flat frame with grooves in the upper part of it,in which the curves or templates representing the different components are fixed. On the lower side is a rack, which, when acted on by a pinion, gives the carrier a rectilinear motion through the frame. Underneath the carrier, and across the frame, is a shaft with a crank outside. On this shaft three pinions are fixed ; these give motion to the carrier, vertical slide, and the clock respectively. The clock is fixed on top of the frame above the shaft. 240 PROCEEDINGS OF SECTION A. The curves or templates are each cut to represent a tidal com- ponent, according to its wave length or speed. They are on the scale of 1 inch to the mean solar hour (15°) and 1 inch to the foot in amplitude, and are true sine curves. The wave length of each component bears the same ratio to the solar tide, 82; as its angular speed does to 15°. The rods or plungers have each a pulley on the upper end, and a hard smooth point on the other. They are placed in the slots in the beam already mentioned, the lower end of each resting on a component curve ; and we have already seen there is a fixed pulley in the beam between each rod. A fine flexible wire is passed under each pulley in the beam, and over each one on the rods, through another in the recorder, and back through a larger fixed pulley at the back end of the beam, then the two ends are joined, thus forming and endless wire. The larger pulley just mentioned is fixed to a plate, which is movable backwards and forwards, for adjusting the index to the mean level of the sea. The pulley is attached to the plate by a fine screw, by which means a compensation is effected for the annual and semi-annual tides, the amplitudes of which are treated as constants for fourteen days, and graduations are made on the plate for that purpose. The machine is designed for twenty-three components, although only sixteen have been used, the amplitude of the others being so small that they may be neglected without any material error. Each template or curve is fixed in the carrier at the proper place according to its phase, that is, the first high water of each component tide is placed a certain distance from the epoch or starting point, determined by the previous harmonic analysis. The handle being turned, the carrier, verticle slide, and clock are set in motion, and the curves passing underneath the rods give them a vertical harmonic motion, which is communicated to the index by means of the endless wire. The pointer will then show the height of tide at the time indicated by the clock, and the curve will be traced on the paper attached to the vertical slide. Tt will thus be seen that the machine continuously sums the series and traces the curve. The chief feature of this machine is that all the curves move together at the same rate; the differences in speed being obtained by the difference in the wave-length of the curves. After the curves are once set, the working of the machine is very simple, all that is required being to turn the handle and watch the pointer ; when it stops rising it is high water, the time and height can be read off and recorded at once. The same thing applies to low water. If, as may be the case at neaps or “dodging” tide, the pointer does not move much either up or down, and the time ‘SITONI “Y ulnigng Ag ‘QUIYID PY BULIIPAd-APl] Y “IX FLV1d ‘Q681 IA TOA ‘OS ‘AGY ‘OOSSY NVISWIVELSAy THE TIDES OF SOUTH AUSTRALIA. 241 of high or low water uncertain, the vertical slide can ke put in and the curve traced, the time and height can then be measured off. When one of the carriers (of which there are three) is through the frame it can be disconnected from the others and connected up again at the other end, the curves are again placed in their respective grooves, butting close up to the preceding ones, and so on, forming a continuous chain of curves. With a little practice this can be done expeditiously, and very little time lost. By means of this machine the tides for a year can be predicted, and a tide-table published at a comparatively small cost, because the time and height can be read off and tabulated at once ready for the printer. In other tide-predicting machines where the motion of each component is represented by an eccentric or crank and pinion, it is necessary to drive each wheel at a different speed, and this necessitates very complicated gearing. In this machine, how- ever, all the components are driven along at the same speed, and the machine is thereby greatly simplified. No matter how irre- gularly the handle is turned the motion forward automatically indicates the time. The machine has been tested by setting it for a year that was past, and the results compared with actuality. This comparison showed that there was a probable error of from five to ten minutes in time, and from 6 to 8 inches in height, which may be considered very good for a place where the meteorological effects bears such a large proportion to the ordinary rise and fall. No. 6.—THE TIDES OF SOUTH AUSTRALIA. _ By R. W. Cuarman, M.A., B.C.E., and Capt. A. Ineuis. (Read January 10, 1898). At the Adelaide meeting of the Association, we stated that we were then engaged in making a second analysis of the Port Adelaide tide curves. The work was soon afterwards completed, and the results of the second analysis are stated in the following table, side by side with the first ones. We found, however, that through too blindly following certain wrong instructions in “Baird’s Tide Manual,” that we had made an error of 180° in Q 242 PROCEEDINGS OF SECTION A. several of the phases in the first analysis, and we now give the corrected results. They are stated in terms of the notation adopted in the British Association reports. The larger com- ponents show a very fair agreement in the two cases, but, as is to be expected, the smaller ones do not agree so well. This has been found to be the case at other places where the tides have been analysed, notably in India ; the amplitudes being so small they are confused with the meteorological effects. Results of Harmonic Analysis of Port Adelaide Tides. Analysis of Tide Curve for Analysis of Tide Curve for 12 months beginning midnight, 12 months beginning noon, February 28, 1889. January 1, 1893. Semi-range Semi-range in feet. K in feet. K eee eet 08 122° 06 108° See een eG 180° 1°70 182° unas EME 0 02 178° 04 194° Ghee Mee cat setae pale aees teed ‘Ol 180° DO GSC CRA AERO CHtRate "21 51° 22 62° ow pee es 84 51° 82 54° dae ae gsc eA eRe SHh. ene eee siesjenctars UL 165° Race ccc aCe Cal Pam entioe ne aeacey aul me Caer ee “04 138° WP eee siadacwarmeadttects 47 Wee *46 179° M, Ol 24° 03 8° BNiaes ae ane toeeeeue tet ie 7/ak 121° 1:69 119° M; cfatelayereie.ejelejeelevelelovelsveisie|{limiivielays\sfe)sialetslors aheieieletele ‘06 99° es a 02 176° 02 171° MA eecchesccocssmecll! wetuscsctene. (Ill) vecmecscecnes ‘01 259° ING cee cone 08 294° ‘10 198° sews Gao eeTar a nll eeeateaeeteal ob | chaos emeutonss “12 140° VIM Re Tera atacaisome sane Baccen ‘06 76° OP sccncnes tans 53 34° +5ilt 30° dF capeeannssncescnanre < aetewe 05 65° (Ais eanacceebsoancisaegas| |) liconmpa noone owes ‘07 Sie EPR ace che(ou tee aicicle Sec ia ra inlabeiatetuiatalcicisct aE Votes awerneitee “28 226° DSM bed osctacsecodls peeoetecesden Tl Misdensennaer ‘10 67° IVES wise trite tested uta eon aa ao aee ‘09 99° Sa eanasscrnmontoscies 25 1322 36 121° Saal cestoceeceacssens 17 WY 28 54° IMISE ie sac ctenesuse eee 13 256° 11 254° Mf 08 194° O04 168° hit Coa eedeis Saran oars er 08 258° 06 143° The behaviour of a wave in travelling up a gradually narrowing channel is well exhibited in the tidal effects of Spencer and St. Vincent Gulfs. The wave is propagated with a greater speed along the deep water of the middle of the gulf than along the THE TIDES OF SOUTH AUSTRALTA. 243 shallows at the sides, so that it is everywhere high water in the middle of the gulf some considerable time (about one and a quarter hour opposite the Semaphore) before it is high water at the opposite points on the shore at each side. By the time the wave has reached the head of St. Vincent Gulf, the co-tidal line is practically parallel with the coast line for some considerable distance all round, so that the wave reaches Port Wakefield, at the head of the gulf, at the same time as it reaches the Semaphore and Black Point at the sides, and the time of high water is the same at the three places. Further, as the wave travels up the gradually narrowing gulf into shallower water, its speed diminishes but its height increases ; so that the mean spring range of the water is 6 ft. at Rapid Head, 8 ft. 3 in. at Port Adelaide, whilst at the head of the gulf at Port Wakefield the range is 11 ft. Again, going up Spencer Gulf the spring range is 5 ft. at Thistle Island, but becomes increased to 12 ft. at Port Augusta. The tide enters St. Vincent Gulf by the two channels round Kangaroo Island, but unfortunately observations have not been taken at a sufficient number of points round the island to enable us to trace ont the co-tidal lines. It is peculiar that high water reaches Ante- Chamber Bay one and three-quarter hour before it reaches Cape Willoughby. Apparently when the tide enters the gulf there is a strong current setting across from Sturt Bay on the peninsula, to Hog Bay on the island, as has been evidenced on several occasions by the way in which wreckage has been carried. A peculiar tidal phenomenon takes place at Port Lincoln, which was noticed by Flinders. He observed there that “the tide did not exceed 34 feet, and that, as in Princess Royal Harbour, there was only one high water in twenty-four hours, which took place at night, about eleven hours after the moon’s passage over the meridian. Yet at Thorny Passage, which is but a few leagues distant, there were two sets daily. This difference in so short a space appears extraordinary; but it may perhaps be accounted for by the direction of the entrance to the port, which is open to the N.E., from whence the ebb comes.”* The suggestion here made by Flinders gives us the explanation of the phenomenon, when we take into account as well the diurnal inequality. Thus at Port Lincoln, the observable tide is really the higher one of the two daily tides. Owing to the direction of the outlet of the harbour the water cannot get out freely, as the harbour catches the ebbing tide from the gulf, with the result that the level of the water falls very slowly ; so slowly in fact, that the second lower tide which follows in the course of the day does not appreciably raise the level of the Captain Flinders, Terr, Aust., Vol. I, p. 150. 24.4) PROCEEDINGS OF SECTION A. water, and so is not apparent as a tide. At Boston Bay there are two tides with:a large diurnal inequality so marked as to make it sometimes appear that there is only one tide in the day. The absence at these ports of that intimate connection between the time of high water and the time of the moon’s passage across the meridian, which is so marked in the ports of the North Atlantic, is well brought out in the accompanying diagram. In this we have plotted curves, for Brest and for Port Adelaide, showing the nature of the changes in the interval between the moon’s meridian passage and high water on successive days at these ports. The ordinates to the curve are drawn at equal distances apart for successive tides, the length of the ordinate representing the interval. The lower curve represents the result in the case of Brest, and shows a regular wave lying wholly on one side of the zero line. When, however, we attempt to do the same thing with our Port Adelaide tides we find that instead of getting a periodic curve the interval shows a continuous progres- sion, as is exhibited on the same diagram by the upper curve. In fact we have not the same number of tides in a month as there are transits of the moon. No. 7.—NOTES ON THE VERTICAL COMPONENT OF THE MOTION OF THE EARTH’S ATMOSPHERE, AND- A WIND-VANE, SHOWING VERTICAI MOTIONS OF THE AIR. By Masor-GenersL Scuaw, C.B. (Read January 10, 1898. ) PLATE X11. VoL. VII, 1898. AUSTRALASIAN Assoc. Apv. Sc. MOON'S MERIDIAN PASSAGE EEE LUNI-TIDAL INTERVAL H FEE co + | + JL lin ssicritsstee f aire + Scss HHH eoect EC aap eerie stctet Be Fite oe a eae HH ScEaeoett Sesiiitasatt oon! seed | iSSCaHHEH CEE iieait ieesatett EEE Ba T node ue 20 a a | TT TT TIA —+. BoDe! Part Cee GRESERR.Se EEE I : > i EES | t ial FEEEEUUDDEN Nata feces SEESHLEEeostaiittocet SSEHiEScaisesotitTocd Baaea a a Ss HEILSCEHHEHT ioe ieaee Bane eet TT ra SrSHESeaiiincedt att rf eine isis EEE ae seaasil FEE pete Hee ia [Sea } if T Pare Pe PERE EEE HH ats scitt PT tt TT t | | 4 4 a a a a iE ha aa ae a He HHH ial ane SH FH i Wy | “ia | ft ++ HEH | r ae TT JESSE ‘| piss Be = ~+ Hi serarars PEEEEHEEE HEHE PEE [Tt Se | | BEpzaa tA PELE : FEET itt aie ised t TI TTT HH ol FH HH sisi aa | Eo Per MOON'S MERIDIAN PASSAGE The Tides of South Australia. R. W. CHAPMAN and Captain INGLIS. akad ; vac sol kane Maen _ ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 245 No. 8.—EXPERIMENTS ON SOME ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. By Prorrssor THRELFALL, M.A., and J. Bernarp ALLEN, B.Sc. (Read January 10, 1898. ) Norr.—The experiments described in this paper form part of a more elaborate investigation. Other results of the investigation have already been published ‘‘ The Electrical Properties of Pure Sulphur,” Threlfall and Brearley, Phil. Trans. Vol. 187 (1896) A. In that paper many matters, here merely referred to, are fully dealt with, e.g., the methods of purifying the sulphur. Quantitative results are given for the conductivity of sulphur under various conditions of solubility. Section III of this paper deals with the general character of sulphur conductivity when the sulphur is much less soluble. The general bearings of this section will be plainer if read in connection with the paper above referred to. SECTION I.—CONTACT FORCE BETWEEN DIFFERENT KINDS OF SULPHUR. Ir has been shown that when two metals are in electrical contact a difference of potential exists between them. The same thing has also been found to be true of different non-conductors. It seemed probable, therefore, that a similar difference of potential might occur between the same substance in different molecular conditions. The following experiments were undertaken with a view to determine whether any such voltage could be detected between sulphur in the soluble and insoluble states. As a first method an electrometer needle was made of sulphur, half of it being soluble, and the other half insoluble. This was hung within the quadrants of an electrometer, which were joined in adjacent pairs, so as to be virtually semicircles at different potentials. If, then, one end of the needle were at a higher potential than the other, a deflection would be produced reversing in direction upon interchanging the potentials of the semicircles. As an alternative method sulphur quadrants were made, alternate quadrants being formed of the soluble and insoluble modifications. Above these was hung an ordinary electrometer needle. If any voltage existed between the quadrants the needle would be deflected from its position of equilibrium upon charging it. The principal obvious source of error to be guarded against was the disturbing effect of ordinary electrostatic induction. The electrometer used was of the Clifton pattern. The case was lined with tinfoil, except at the front and back, which were of glass. Cardboard shutters covered with tinfoil were made to cover these 246 PROCEEDINGS OF SECTION A. places, so that the inside could be perfectly screened from external action. No difference of effect was at any time noticed upon removing or replacing these shutters, so that the screening from outside effects must have been sufficiently perfect. The induction from the charged parts of the apparatus upon the sulphur regarded as a conductor was shown in the course of the experiments to have considerable effect, the conductor induc- tion upon the insoluble parts being greater than upon the soluble, as their conductivity is greater. This source of error was guarded against in using the sulphur quadrants, as will be explained later, but in using the sulphur needle the disturbing effect was con- siderable. For if the semicircles were electrified oppositely, the insoluble end of the needle would have its halves oppositely charged by induction, the corresponding effect upon the soluble end being much weaker, owing to difference of specific resistance and specific inductive capacity, as has been stated. The effect of induction would therefore be to subject the insoluble end of the needle to two pulls in opposite directions. Any want of symmetry might cause one of these pulls to be greater than the other, and so a deflection might be produced due to induction alone. The reversibility of such an effect would depend largely upon the rapidity with which induction charges could distribute themselves on the needle, and other things that cannot be determined. As it is impossible to ensure perfect symmetry, some error is sure to occur due to this cause; accordingly the results obtained with the needle were unsatisfactory. Upon hanging the ordinary needle in position and charging the quadrants, connected as described, deflections of over 40° were obtained by induction effects, but as the needle was connected with the condenser, the case hardly corresponded to that of the sulphur needle. The needles were cast in an aluminium mould. To make this two pieces of aluminium plate 1 mm. in thickness were taken. From one of these a piece was cut out resembling in shape half of an electrometer needle. This plate was then sawn across so that it could be removed from the sulphur in two pieces. The two plates were then clamped together. In order to obtain the soluble half of the needle the mould was heated gradually on a brass plate with a gas flame till particles of sulphur dropped on it began to melt. The flame was then removed and sufficient sulphur placed in the mould to fill it to the level of the second plate. After the sulphur was melted and cooled the pieces of the upper plate were carefully removed. In order to remove the sulphur needle from the second plate, the latter was heated very gradually until the sulphur could just be pushed off by means of a glass rod. The half needle thus obtained was heated for some time in an air bath to a temperature of 108° C. and then allowed to cool very slowly. ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 247 To obtain the insoluble half the mould was prepared just as before, the sulphur melted as in the previous case, but the temperature was raised till the sulphur became thick and dark. It was then suddenly quenched in water, left in the mould for about half an hour till it became stiff enough for removal, and taken off with a sharp knife. The two halves of the needle were cemented together with sulphur by means of a piece of hot aluminium. A fine fused quartz-rod was fastened to the centre; to this was attached a mirror, and the upper end was bent into the form of a hook. This could be hung on to a glass hook suspended bifilarly above the quadrants with silk, so that the needle could easily and quickly be removed and replaced. To make the sulphur quadrants a shallow zinc dish was pre- pared, with a round hole at the centre, through which the wire from the needle was allowed to pass. Four zinc partitions were fitted in, dividing the dish into quadrants. The dish was heated and two opposite quadrants filled with sulphur, the temperature was raised till the sulphur was on the point of burning, when the whole was cooled by plunging into water or laying the dish upon a block of ice. ‘fhe partitions were removed, and the other quad- rants were filled with soluble sulphur. This sulphur was first annealed and then heated to the melting point, care being taken not to heat it much above 128° CO, The sulphur had to be freed from any free electrification due to rubbing, or any cause other than contact difference of potential. This was done by passing a flame over it several times. It was rather difficult to do this with the needles without cracking them or setting them on fire, so that no very complete series of results could be obtained with the same needle. The needle was first diselectrified and hung inside the quad- rants. Upon connecting one (adjacent) pair with the case and earth and bringing the other pair to a positive poten- tial of about 50 volts by means of a storage battery there was a deflection of the soluble end towards the charged pair of quad- rants. When the electrification was transferred to the dther pair of quadrants the deflection was reversed, that is to say, the soluble end was still attracted towards the charged pair. The deflection obtained in this way was very small, not more than two or three divisions on the scale, placed 1 metre away. To increase the deflection an electrophorus was used ; the results were exactly similar but much larger. The needle was hung above the quadrants, but the effects were not altered. In making further alterations the needle broke. The experiment was repeated with a new needle, but this time exactly opposite results were obtained. The soluble end being deflected towards the uncharged pair of quadrants. The effect 248 PROCEEDINGS OF SECTION A. appeared to be reversible, but upon trying repeatedly the deflec- tion became less regular, so that the deflection in one direction was greater than that in the other. On leaving the apparatus for an hour or two without disturbance and then repeating the experiment a deflection was obtained which would not reverse-on reversing the electrification of the quadrants. These experiments with the needles showed that if there were any contact effect constant in character the imperfections of the needle method were such that it could not be satisfactorily established in this way. The experiments with the quadrants were much more satisfac- tory and consistent. for the first two sets of quadrants ordinary roll sulphur was used. The first set was made in a dish 11 cm. in diameter, the second was 11:5 em. in diameter. The zine dish containing the quadrants was first of all placed upon the brass quadrants of the instrument and the aluminium needle hung immediately over them. The needle was charged, as in the ordinary use of the instrument, through the sulphuric acid of the condenser. For the first few trials no very consistent results were obtained owing, as it afterwards appeared, to insufficient diselectrification. Using first a potential of 50 volts a small deflection towards the insoluble quadrants was noticed when the charge on the needle was positive and towards the soluble when the charge was negative, but the deflection towards the insoluble was always much smaller than that towards the soluble. On rotating the quadrants through an angle of 90° the deflection was reversed. The zine dish was insulated from the brass quadrants on mica plates, and the potential used raised to 100 volts. In this case the deflection could not be reversed by changing the sign of the charge. The deflection was always towards the soluble quadrants, being larger in one direction than the other. These results showed that some disturbing influence was at. work, so the quad- rants were taken off and thoroughly diselectrified. Upon replacing them the electrophorus was used to charge the needle. The deflection was then much larger: the spot could easily be sent completely off the scale. The displacement was now invariably towards the soluble quadrants, the charge being positive. The quadrants were rotated repeatedly through 90° each time, and every time the deflection was reversed. The reversal showed that the deflection could not be due to induction: or other effects between the needle, case, and brass quadrants, as the only part moved was the sulphur dish. The deflection must have been due to something in the sulphur. The case was: some- times insulated and sometimes joined to earth. The quadrants also were sometimes insulated on mica, but no alteration of the effect was noticed ; the needle was always attracted towards the ELECTRICAL PROPERTIES. OF PURIFIED SULPHUR. 249 soluble quadrants and repelled from the insoluble, the needle being charged positively. The second set of quadrants was then made, and the same series of experiments was gone through. The quadrants were diselectrified as usual and placed in position. Exactly the same results were obtained as with the first set after diselectrification. The electrophorus was first used for charging. There was. a large deflection towards the soluble quadrants. On rotating through 90° the deflection was reversed, still towards the soluble quadrants. The rotation was performed repeatedly without any contradictory result being obtained. The insulation of the case and brass quadrants was altered without alteration of the result. The battery being used to charge the needle a positive charge gave a deflection in the same direction as before ; a negative charge turned the needle towards the insoluble quadrants. One of the insoluble quadrants was rubbed a little with a bit of flannel, and the deflection on charging with the electrophorus was reversed, turnirg towards the insoluble quadrants, and show- ing that sufficient negative electricity is easily developed on the insoluble sulphur, to overcome that on the soluble, due to contact effect. This reversal of effect ceased after about fifteen minutes. At one time, with these quadrants, we noticed a reversal of the direction of deflection upon greatly increasing the charge ; but this was much better seen, and further studied, with the third set of quadrants. The third set of quadrants was made in the same dish that was used for the second, but greater care was taken in their manu- facture. Instead of roll sulphur pure Chance Claus sulphur once distilled was used. Much greater care was taken to ensure perfect solubility in the soluble quadrants. The sulphur used for them was very gradually heated to about 116° C. in an oil-bath, several hours being consumed in the process. The sulphur was. left for some time at this temperature, and then slowly cooled. This process was repeated a second time. In order to melt it, it was heated in the oil-bath again to 128° C., and then poured into the zine dish. In order to obtain a smooth even surface, and to distribute the sulphur over the quadrants, the surface had to be smoothed by a piece of aluminium heated till particles of sulphur would just melt on it. Besides the diselectrification as before, this set was diselectrified in-situ by means of a fine gas jet. In order to prevent the possible electrifying effect of rubbing when rotating the zinc dish upon some other substance, a zine plate, cut from the same piece as that from which the dish was made, was placed beneath it, and to vary the tests of reversibility, two mirrors, at right angles, were fixed on to the needle-rod, so that the needle could be rotated as well as the quadrants and its deflections observed. 250 PROCEEDINGS OF SECTION A. The electrophorus was used to charge the needle. Upon a charge being given, there was a deflection towards the soluble quad- rants, as there had been before. On increasing the charge, the deflection increased to the extent of about 123 divisions on the scale. Still increasing the charge, the deflection began to decrease, till at last the spot of light stood again at zero. Still increasing the charge the deflection reached 130 divi- sions on the other side of zero. On allowing the charge to gradually dissipate, a reverse series of movements was gone through ; the deflection towards the insoluble quadrants disap- peared and changed back to the original direction. When it reached eighty-five divisions in this direction it again altered the direction of movement and gradually settled down to zero. The needle was then rotated through 90°, everything else remaining as before. On charging (positively) there was a large deflection as before towards the soluble quadrants. When the charge was increased, the deflection diminished again, and then a deflection towards the insoluble quadrants took place, which was increased to about 20° by sufficiently increasing the charge. On allowing the charge to leak away, the effects were gone through backwards just as before. Rotating the needle several times the same results were obtained. This reversal effect upon increasing the positive charge on the needle could be accounted for by induction in the insoluble quadrants. Insoluble sulphur has a higher specific inductive capacity, and certainly a much higher electric conductivity than the soluble modification. Surface charge, due to difference of specific inductive capacity of sulphur from that of air, would, therefore, be greater on the insoluble quadrants. Induction charges, such as those formed in the ordinary way upon con- ductors, would also be much more rapidly formed on the insoluble sulphur ; they would also leak away more quickly. Starting, then, with a negative charge on the soluble quadrants, and a positive on the insoluble, due to the contact of the two modifications, the deflection on giving the needle a positive charge would be towards the soluble sulphur as usual. On increasing the charge, the induced charge would begin to have effect. The positive charge on the needle would induce a negative charge on the upper surface of the insoluble quadrants, which would tend to reverse the deflection, and when this induced charge became sufficiently great would actually cause a reversal. On allowing the charge to leak away, the induction charge would disappear, and so the deflection would return to its original direction, but would not attain its first maximum owing to the diminishing charge on the needle. To test whether this was the true explanation, it was con- sidered that, if the needle were charged negatively, no such ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 251 reversal should take place, as the direction would originally be in the direction of the insoluble quadrants, and the induction charge would tend the same way. To obtain a sufficiently great negative charge, a small Wimshurst machine was used, with results that had been anticipated. The deflection was towards the insoluble quadrants, increasing with increasing charge, but no reversal of the direction could be obtained. The charging was repeated with rotation of the needle and of the quadrants in all possible positions, but with the same effect each time—deflection towards the insoluble with a negative charge, and to the soluble with a positive charge, the latter of which reversed in direction upon sufficiently increasing the charge. Care had to be taken that the needle was well discharged before every charging, as it was found that the residual charge of the jar was sometimes sufficient when the needle bad been imper- fectly discharged to re-charge it beyond the position of reversal. The general conclusion arrived at, therefore, was that there is a difference of potential set up upon contact between soluble and insoluble sulphur, the positive charge being on the insoluble, and the negative on the soluble. This conclusion was always con- sistent with the results obtained with the sulphur quadrants when care was taken to diselectrify them. All possible induction effects were either eliminated by reversal or accounted for in the phenomena observed. Although no consistent results were given with the sulphur needles, it has been shown that this may easily be due to the inherent defects of the method, and not to any uncertainty as to the contact voltage under consideration. It was not possible by this method to measure the difference of potential obtained. As the proportion of insoluble sulphur in the so-called insoluble quadrants is a very variable quantity, decreasing slightly with a lapse of time, the voltage probably varies largely also, so that a particular result would not have any general applicability. To get an idea, however, of the voltage noted, a Leclanché cell was used with the brass quadrants ; and it was found that on charging the needle as before, deflections were obtained not differing very widely from those given with the sulphur quadrants. It is, therefore, probable that the voltage developed between soluble and ordinarily insoluble sulphur amount to something of the order of one volt. The so-called insoluble sulphur is really a mixture of about 5 per cent. of insoluble with 95 per cent. of soluble sulphur, the latter being at first mostly prismatic and afterwards mostly octahedral. As no difference of effect was observed after several days ageing of the quadrants, we may consider that the above results are not dependent on the particular crystalline condition of the soluble sulphur. hs Cu bo PROCEEDINGS OF SECTION A. SECTION II.—ACTION OF LIGHT ON THE CONDUCTIVITY. OF SULPHUR. The action of light in reducing the resistance of selenium is well known. Dr. Monckman (Phil. Proc., 1889) considers that he has observed a similar effect with sulphur, but the observations chronicled by him leave considerable doubt on the question. Of his three sets of observations, the first points to a considerably reduced resistance in the light; the second and third to a slight increase of resistance. The conductivity varies considerably from time to time. Dr. Monckman’s experiments can hardly, there- fore, be considered conclusive, even assuming the purity of his material. Some experiments have been made by us to determine whether light really has any appreciable effect upon the conductivity of sulphur. The first question to be considered was as to what molecular modification should be used. Sulphur, in the soluble state, is at the present limit of experimental method practically a perfect non-conductor. Pure insoluble sulphur on the other hand cannot be obtained in a film suitable for experiment. The only course was, therefore, to use a mixture of soluble and insoluble sulphur, for which some small conductivity has been proved. This being so, it was obviously desirable to obtain the sulphur in the state of greatest conductivity, and to this end the sulphur was prepared with as great a proportion of insoluble sulphur as possible.* Analyses made with two cells used, gave 21°35 and 14-96 as the percentages of insoluble sulphur. The composition of the other cells was probably within these limits. As regards quality, the cells were made*from roll sulphur twice distilled, one or two, however, being made from sulphur that had only been once distilled. Various experiments were made to determine what form of sulphur resistance cell was most suitable, the following form being finally adopted. A rectangular slab of sulphur was taken, about 6 cm. long by 3 cm. broad, and from 3 to 4 mm. thick. This was wound with two parallel spirals of thin platinum wire, which were nowhere allowed to touch, but were wound as closely as possible, the average distance between the spirals being a little over 1 millimetre for most of the cells. After winding, a hot glass rod was passed over the wire, which was thus pressed into and covered with a thin film of sulphur. A large conducting surface of sulphur is obtained in this way, which can easily be exposed to light. *It was thought at this time that the conductivity would be found to increase with the proportion of insoluble sulphur pregent. ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 250 The sulphur slabs were cast in little zinc moulds. These were filled with sulphur, and heated till the sulphur was on the point of bursting into flame; they were then plunged into cold water. When the sulphur was sufliciently set, the dishes were cut off with a knife. When quite hard, they were scraped carefully all over to remove any surface contamination which might have been caused by exposure during heating or by immersion in the water. They were dried by warming and leaving some hours over phosphorus pentoxide. The weakest part of this method for the preparation of the cells is undoubtedly the melting in of the wires by means of hot glass, for it is difficult to ensure that the rod shall be perfectly clean, and the annealing produced is quite uncertain. At first the electrometer method was used to measure the resistance of the cells, but no very satisfactory evidence was obtained in this way. When a steady fall of electrometer deflection was observed on _ short-circuiting the electrodes through the sulphur, no constant difference in the rate of discharge was detected on exposing the sulphur to light. Both sunlight, gaslight, and magnesium light were used, but with entirely negative results. These results were affected by the imperfect shielding of-the sulphur from dusty air. Most of the experiments were made by the galvanometric method. The cells were hung by means of the ends of the platinum wires in jars containing phosphorus pentoxide to ensure dryness, the wires passing through small holes in the lids of the jars. The battery and galvanometer were connected in simple series with the cell. The battery consisted of forty Clark cells. It was invariably found that when first the circuit was completed there was great irregularity of conduction, and it was only after some time—a time which varied from about an hour with some cells to as much as a day with others—that a deflection could be obtained sufficiently steady for the experiments to be tried. Remarkable changes in the conductivity were observed. As regards the action of the light, however, the method of procedure was very simple. A steady deflection having been obtained in a darkened room, a piece of magnesium wire was lighted, so as to shine on the sulphurcell. Any change in the conductivity should have been accompanied by a change in the deflection. None was in any case observed. Owing to changes of zero of the galvano- meter, an apparent change of deflection to the extent of one or two divisions was sometimes noticed, but after repeated trials this change was found to be just as often in the direction of a decreased deflection as of an increased one. During numerous trials, however, when the galvanometer was exceptionally steady, perfectly steady deflections were obtained, both before and after 254 PROCEEDINGS OF SECTION A. the light was applied. In these cases no change of deflection was ever noticed. The voltage used was varied from that given by one Clark cell to that of forty cells, acccording to the conductivity. The deflections varied from 30 to over 150 mm., and as a variation of a couple of divisions could be certainly measured, the experiments show that, with sulphur in the form in which we have used it, light cannot aftect the conductivity to the extent of more than 1 per cent. SECTION III.—CONDUCTION IN SULPHUR OF HIGH INSOLUBILITY. As has been already stated in experimenting upon the effect of light upon the conductivity of sulphur, all the ordinary phenomena of sulphur conduction were obtained, some of them in an appar- ently exaggerated form. As considerable insolubility was obtained in these experiments, the method used appeared well adapted for extending the qualitative results obtained for the electric conduc- tivity of sulphur of large solubility to sulphur of much less solubility. The form of sulphur conductor was, of course, made in the first instance with a view to obtain as much conductivity as possible in a sulphur cell that could be exposed to light without difficulty. Various methods of winding platinum upon mica, &e., and covering with sulphur were tried, in imitation of the cells made by Adams, Bidwell, and others in the study of selenium. These cells were finally rejected in favour of cells made in the way already described, which were used throughout in the experiments with light. On account of the possibility of contamination, however, the results given by the cells made in the fashion described cannot be relied upon as accurate. The general character of the phenomena observed may, however, be given. The different cells made differed widely in conductivity, with some of them a single cell was sufticient to send the light spot the whole length of the scale, while with others the whole battery of forty cells was used, and the deflection then obtained was small. The following facts appeared to be true of all the cells :— 1. The deflection which was obtained when the current was first passed gradually diminished all the time the current was running. 2. After this decrease of conductivity, if the direction of the current through the sulphur was reversed, the deflection was increased considerably. 3. When the number of cells in the battery was increased the conductivity increased, some minutes elapsing gener- ally before the maximum current was obtained. The deflection then began to decrease again as usual. ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 255 With most of the cells, but not all, the conduction obtained exhibited the peculiar jumpy action before observed with sulphur. When a steady deflection appeared to have been attained it would suddenly increase to, perhaps, double its value, returning again almost immediately to its former value. Tn one case a cell that was being studied as it hung in undried air gave this jumpy action, but when the air was dried with phosphorus pentoxide no conductivity at all was obtained. It appears, therefore, that this peculiar action may be sometimes due to a surface conductivity, and is not perfectly characteristic of sulphur. The higher conductivity in one direction than the other at once suggests the presence of an E.M.F. in the sulphur itself, and of sufficient magnitude to give a current observable through the galvanometer. With the first four cells no deflection could be detected upon shortcireuiting the sulphur cell through the gal- vanometer. Cell No. 5, which showed the relation between conductivity and direction very markedly, the deflection in one case being 30 in one direction and 560 in the other, gave a deflec- tion of two divisions on shortcircuiting through the galvanometer. Two more cells were then made as much alike as possible with a view to determine to what extent time alone was responsible for the changes of conductivity, and how much was due to the passage of a current. In studying these cells, which had a much higher conductivity than any of the others, the resistance being originally 6:2 and 7:4 megohms, it was found that they exhibited a con- siderable back E.M.F. giving large deflections with the galvano- meter. This contrast of properties with those previously made was another indication that the method was uncertain. On testing these cells with the quadrant electrometer they were found to give a deflection of from thirty to thirty-five divisions, z.e., about 1 volt. This was the same whether the five cells or forty were used to produce the voltage and was not increased by leaving the battery on for a lengthened period, indicating that the polarisation was galvanic and not dielectric residual. The direction of the voltage in the cell was reversible by leaving the battery in series with it for about half a minute. In order to get rid of some of the objections to this method of manufacture a cell was made in the same way as regards winding, &c., but instead of touching with hot glass the cell was dipped as rapidly as possible into a bath of sulphur heated till it was as thick as it was practicable to make it, so as not to melt the sulphur slab in the process of immersion. The wires were thus covered with sulphur, but the insolubility obtained in this way was not so perfect as by the first method. A deflection of 256 PROCEEDINGS OF SECTION A. eighteen divisions was obtained with this cell using a 40-cell Clark battery, but the deflection rapidly decreased to zero, and after that no conductivity could be detected. In order to combine the advantages of the two methods, 7.e., to have great insolubility and pure uncontaminated sulphur the following method of manufacture was finally used for the sulphur cell. Two glass rods 7:7 cm. long and :45 cm. in diameter were fixed parallel to one another, and with their centres 3 cm. apart by means of two aluminium cross bars, through which the glass rods passed. The length of the glass rods between the aluminium bars was 6:2 cm., forming a sort of Oxford frame upon which to wind the platinum wire. Each electrode was formed of twenty com- plete turns of platinum wire wound upon this frame, the total length of wire to each electrode being 160 cm. There were, therefore, altogether forty complete turns at an average distance of 1-5 mm. from one another. After the frame had been very carefully cleaned the wire was wound on, the electrodes being joined, one to each aluminium bar. ‘The frame was provided with an aluminium handle about 6 cm. long. The sulphur used for this cell was once distilled Chance sulphur. This was heated to melting, and the frame immersed in it. The temperature was then raised till the sulphur was so thick that on withdrawing the frame the latter was covered thickly all over with a mass of viscid sulphur. It was then suddenly immersed. in distilled water and left till cold. In this way the whole frame was covered with highly insoluble sulphur, the electrodes being shielded from surface action by a thick coat of sulphur. The conductivity of this cell was small in comparison with that given by some of the cells obtained in the other way, another indication that some at least of the cells had been spoilt by the glass-rod process of burying the wires, for some of them were made with pure sulphur. The cell was first tested for polarisation by the quadrant electro- meter. No certain positive effect could be observed, though owing to the residual charges in the keys necessarily used, no very satisfactory experiments could be made. For the galvanometric study of the cell it was hung by means of its electrodes in the thermostat. With forty cells the elongation upon reversing the current through the galvanometer was fourteen divisions. This elongation fell regularly in half an hour to five divisions, the temperature being 25°5°. The oil-bath was then heated, the galvanometer throw every few minutes being taken while the temperature was rising. ELECTRICAL PROPERTIES OF PURIFIED SULPHUR. 257 The following table is sufficient to show the variation of con- ductivity during heating :— Time. hh. am; 11°32 11:40 12:0 12°6 12°12 12°22 d G2 G9 Co G9 09 09 6 C9 LD BS OD OP PB oo 0b te oO = MAmawownr- 10 6°17 Temperature. 25°5 The cell was left to cool slowly. The deflections obtained were steady ; at no time were sudden variations observed comparable with the jumps observed before with sulphur conduction. Elongation on reversing through galvanometer. Elongation on stopping the current. 620 606 634 548 389 Reversing as at first 526 315 112 The table given shows that there was only a small change of conductivity upon increase of temperature until the temperature R 258 PROCEEDINGS OF SECTION A, was raised above 100°. While the annealing process was going on there was an immense increase of conductivity. This might be due either to the fact that the annealing was going on, or else merely to the fact of the sulphur being at the high temperature in question. In order to determine between these alternatives the cell was again heated in the same manner as before and the galvanometer kicks noticed. At the temperature of the room no deflection at all could be detected, the sulphur being probably almost completely soluble. On heating, none of the former changes of conductivity could be noticed. At 57:°5° C. the kick, or reversal, was 2 divisions, and the reading the same very nearly all the time the cell was being heated up to 110°, and after it started to cool again. The elongations varied slightly between 1 and 3; but on account of the smallness of the deflections, and the small movements of zero, the variations may have been due to errors of reading as much as to variation of the properties of the sulphur. They may also have been caused by the intermittent conductionfrequently shown by sulphur, No series of changes was gone through on this second heating such as upon the first heating, showing that the great increase of conductivity above 100° at the first heating was not due to the temperature alone, but was due either to the fact that the process of annealing and the change from insoluble to soluble sulphur was actively going on, or to the fact that insoluble sulphur pos- sesses the power of conduction when mixed with the soluble variety. The experiment, as a test of whether the progress of the change from insoluble to soluble was the real cause of the con- ductivity, remains indecisive. After again cooling, no current whatever could be detected through the sulphur. On testing its solubility, it was found that there was only a trace of insoluble sulphur present. An analysis of a piece of sulphur broken from the cell previous to annealing gave as the composition 19°68 per cent. of insoluble sulphur. Of the cells made by the first method two were analysed, giving as their composition 15:69 and 21:35 per cent of insoluble. Though the sulphur was considerably cracked after the first annealing, it is probable that the separation of the sulphur from the wires was not sufficient to account for the total change of conductivity. No. 9.—RESULTS FROM VARIOUS-SIZED RATIN- GAUGES. By H. C. Kippiz, F.R.MLS. (Read January 11, 1898.) CLOUD OBSERVATIONS IN VICTORIA. 259 No. 10.—CLOUD OBSERVATIONS IN VICTORIA. By P. Baraccut, F.R.A.S8., Government Astronomer, Melbourne. (Read January 11, 1898.) Tu year 1897 has been called by some writers on Meteorological subjects “The Cloud Year,” on account of the systematic obser- vations of clouds which were carried on in nearly all the civilised countries during that period, under a scheme laid out and finally agreed upon, in all its detail, by the International Meteorological Committee at its Upsala meeting in 1894. The object of the scheme was to obtain more uniform and comprehensive data, to serve as the basis for the furthur study of atmospheric conditions, as indicated by the forms and movements of clouds. All the Central Meteorological Institutions were asked to co operate, and some of the Australian colonies promised to con- tribute their share. The operations contemplated in the scheme were of two distinct classes :— Ist. Observations of form, direction of motion, and apparent velocity of clouds, to be made three times daily, when possible, by as many observers as could be recruited by each institution ; the observations to be made without instruments, or with the simple nephoscope. 2nd. Observations for the determination of the absolute height and velocity of clouds, made with instruments of precision, either visual or photographic. It was further intimated that the operations were to commence on May 1, 1896, and to be continued for twelve months; but the period was afterwards altered from January 1 to December 31, 1897, owing to various countries being unable to commence at the earlier date. The fixed period was more particularly intended for the obser- vations of the Ist class, and more latitude was given for the absolute measurements. In Victoria we have just concluded the first part of the work, and the second part is still going on, and will probably be con- tinued for some time longer, as the past experience has taught us that it can be further improved. It is not my purpose to discuss the complex problems for the treatment of which the cloud scheme was initiated, nor to specu- late on the possible advantages which many authorities expect to derive from it for the advancement of meteorology, practical and theoretical. I shall merely give a brief sketch of what has been done in Victoria. 260 PROCEEDINGS OF SECTION A. In order to secure observations of the first-class (non-instru- mental) at various up-country places, a circular was issued towards the end of 1895 inviting volunteer observers to join in the work, and fifty-one names were enlisted. After preliminary instruc- tions and practice, the work commenced on May 1, 1896, in accordance with the original resolutions of the I.M.C. On examining the returns of the first three months it was found that a little more than one-third of the observations were not sufficiently reliable, and the number of observers was reduced to about thirty. Some of these continued their work till May, 1897, but only eighteen could be induced to extend their services to the end of the year; so that for the cloud year proper we have only the complete returns of eighteen observers, whose work is regarded as being entirely satisfactory throughout. The work of the other twelve observers, however, will be duly utilised. The returns contain records of observations made three times daily whenever practicable, and give for each observation :— Ist. The form of the cloud, in accordance with the classifica- tion of the I.M.C., and identified by means of the official cloud atlas. 2nd. The approximate position in azimuth and altitude. 3rd, The direction of motion within one point of the compass. 4th. The apparent velocity. This was estimated in terms of a scale of 5, based on the time occupied by a selected point in the cloud to move through an are of 15°. 5th. Special notes on cirrus clouds, the direction of cirrus bands, the position of their vanishing points, &e. 6th. Direction and force of the surface wind, temperature of air, weather characteristics, and general remarks. There are some 20,000 such observations now ready for dis- cussion ; but as they were concluded only a few days ago, there has not been, nor will there be for some time, any opportunity of arranging this great mass of records in proper form for the deduction of results and publication in extenso as requested by the committee. For the second part of the work, namely, the determination of absolute height and velocity, a pair of stations for simultaneous observations were established, one being on the grounds of the Melbourne Observatory, and the other on the roof of Parliament House, at a distance of 6,820 feet, bearing N. 3° 38’ 51” W. After due consideration of my means and circumstances, I decided to adopt the photographic method which had been suc- cessfully employed at the Kew Observatory some years ago. This method alone makes it possible to conduct the operations with all the required efficiency by means of a few simple and CLOUD OBSERVATIONS IN VICTORIA. 261 fixed rules, which, once mastered, would require no further skill or judgment in the operators 'at the instrument, but only a methodical and conscientious attention to the rules. This was a necessary condition which I had to take into account in deciding upon my course. IT will now describe the main principle on which the Kew photographic method is based. The absolute height and velocity of a cloud, provided it be suitably situated, can be determined from two photographs of it taken simultaneously with two cameras placed at a distance of from a few hundred yards to 1 or 2 miles from each other, the cameras being in all respects equal and rigidly mounted so as to point accurately to their respective zenith—namely, having their collimation axes truly vertical. If two threads, at right-angle to each other, permanently fixed in a plane parallel to and very near the sensitive film, in such a way that the line passing through their intersection and the optical centre of the objective, is maintained in an invariable position relatively to the body of the camera, and falls perpen- dicularly to the face of the plate, then, whenever a picture is taken, these threads will be shadowgraphed on the plate, and the image of their intersection may be adopted as the centre of the plate. So that in all plates exposed in a truly horizontal position, a point in the zenith would form its photographic image at this fiducial centre. Such are the conditions required by the Kew method. Having photographed a cloud under these conditions we obtain on each plate a picture of the cloud and an image of the respective zenith of the two stations. Let us now superimpose the two pictures, so as to make them coincide exactly. To insure accuracy in this operation it would be necessary in practice to take a contact print on glass of one picture, and super- impose this positive on the negative of the other picture. Then it is clear that the line joining the centres of the two plates represents the photographic image of a line joining the two zenithal points of the stations at the height of the cloud, and the ratio of its length to the actual distance between the stations would be the same as the ratio of the focal length of the objective to the height of the cloud, and this height can thus be determined from the data obtainable on the photographs. The process of superposition is, however, somewhat unsatisfactory, and can be obviated by orientating the cameras so that one of the fiducial lines in each is made to coincide with the direction of the line joining the stations. It is then sufficient to measure on each negative the co-ordi- nates of any corresponding point in the image of the cloud, taking the centre of the plate as the origin. 262 PROCEEDINGS OF SECTION A. This is the system adopted in Melbourne. To obtain the absolute velocity of the cloud, we have only to take a second picture at one or both stations after a short interval of (say) one minute, and measure the displacement of the image which, together with the known height and focal length of the apparatus, determines the actual distance traversed by the cloud during the interval between the exposures. I will now proceed to describe the Melbourne arrangements for carrying out this work. I have here a pattern of the body of the cameras, which will give you an idea of their shape and dimensions. The instruments are made of heavy cast-iron, and are similar in every respect. Each consists, generally speaking (and disre- garding particular detail), of a hollow frustrum of a pyramid with a square base, and having a circular opening at the top, into which the lens is fitted. Once adjusted, the lens is permanently fixed, and intended to re- main in an invariable position with regard to the body of the camera. A shallow rectangular opening at the bottom of one side of the appa- ratus serves to introduce the dark slide which carries the plates. On the inner face of the base there are two guides, one of which is plain, and one A-shaped on the top. On these rests the dark slide when zz situ. I have here, also, one of the dark slides for your inspection. You will notice that the wooden parts are attached to a sub- stantial brass frame, one side of which has a v-shaped groove all along its length, with a stop at one end. This groove fits into the guide within the camera, and thus the slide always occupies an invariable position in respect to the body of the instrument. The plate, which is a square, whose side is 158 mm., has two of its contiguous edges grounded with a rounded corner between. When ready for exposure it rests on three steel points, which are fixed on the brass frame, and its two grounded edges are brought in contact with three cylindrical studs, also fixed on the brass frame, while two springs on the opposite sides keep it in that position. So that the plate occupies always an invariable position in respect to the slide, and consequently also in respect to the body of the camera. The fiducial lines, which are required to determine the centre of the plate and its orientation, are obtained by means of a latent image of a reseau impressed on the plate, which is developed together with the cloud picture. The reseau consists of two sets of parallel lines, 5 mm. apart, one set being at right-angles to the other. The intersection of the middle lines of the reseau form the centre of the plate. The reseau process is exactly the same as it is practised in the astrophotographie work of the Observatory, and it is therefore unnecessary to describe it. CLOUD OBSERVATIONS IN VICTORIA. 268 The lenses are “ Zeiss” anastigmat, series IV, No. 3, focal length 4:41 inches, beautifully paired. : The instrumental adjustments are—(lst) To make the optical axes of the cameras truly vertical ; (2nd) To make one of the central lines of the reseau at both stations coincident with the base-line. The first is made in two steps, as follows :—A small telescope, pro- vided with a micrometer, is mounted vertically on an independent tripod, looking downwards, with its objective a few inches above the photographic lens and central with it. A small dish con- taining mercury is then placed between the camera and the telescope, and by means of a Bohnenberger eyepiece we observe the reflected image of the telescope wires, and cause them to coincide with their direct image. We have thus made the colli- mation axis of the telescope truly vertical. The mercury dish is now removed, and a plate containing a developed image of the reseau is placed in the camera in the usual way as if it were exposed for taking a cloud picture. The centre of the plate is now illuminated by means of a small electric lamp, and we look at it through the telescope. If its image is coincident with the intersection of the wires in the telescope, then the collimation axis of the camera must be parallel to that of the telescope, and, therefore, truly vertical. If it is not coincident, the required rectification is made with three levelling screws provided for the purpose. The second adjustment was made approximately in the first instance by stretching a long wire between two poles on the base line, and orientating the camera simply by the eye, and sub- sequently, for further and more accurate verification and rectifi- cation, simultaneous photographs of the sun were taken on every possible opportunity. The azimuth adjustment is also verified by the condition that the co-ordinate, at right angles to the direction of the base line, ought to be the same in both pictures. Both these adjustments are very constant, and there has hardly been any necessity to make rectifications since last July. With ordinary care, these adjustments, once made, remain practically constant for a very long time. The are value of 1 millimeter on the plate is about 35’. The co-ordinates can be measured off the negatives, even roughly, with compass or scale to within a couple of tenths of a millimeter, and, if the cloud points selected for measurement were sufficiently well-defined, the probable error of the co-ordinates might be reduced to half that amount. Such accuracy, however, is not attainable, owing to the nature of the objects photographed. The pictures have no sharp out- lines ; their structure is evanescent, and can hardly bear any magnification. 264 PROCEEDINGS OF SECTION A. On comparing two-paired pictures we can hardly find two corresponding points which can be satisfactorily marked with the fine point of a compass. You often think you can do that on some better defined parts ; but when the mark is to be made, you know it is only a question of rough approximation. Consequently it is unnecessary to attempt greater accuracy in the measures than that obtainable with a scale of millimeters. The photographic part of the work gave more trouble than the instrumental questions. It was intended principally to deal with the higher clouds, some classes of which are sometimes barely visible against the deep blue sky. Yellow screens of different densities were used, with stops no greater than f/32 and exposures from 1/12 to 1/25*. Many experiments were made to determine the best average conditions, with a view to give the work as much uniformity as possible. If it could have been carried on by the same two operators throughout, much could have been left to their experience and discretion, to suit the variable photographic factors to the variable circumstances. But there were four different operators at the far end station, away from the Observa- tory, who took up weekly duty in turn, and with very little time at their disposal. It was essential also to avoid any interference with the camera in order to preserve its adjustments, and to facilitate the opera- tions as much as possible. It would have been undesirable to vary the stop, the time of ex- posure, and the screen in each case, and the desired effect had to be obtained by an average constant combination of these quantities, subject to alterations, only in very exceptional conditions. Every possible combination was tried, and at last we found one which seemed to act satisfactorily. This was 1/25%, for the time of exposure f/25 stop, and a screen of medium density call screen No. 2. It has been possible hitherto to meet almost every exceptional case by sometimes varying the exposure, very rarely using a different screen, and never altering the stop. In the earlier stages we used Ilford isochromatic plates, which, however, gave continuous trouble and poor results. The later plates employed were Ilford chromatic, of medium rapidity, and these have given every satisfaction, and are in use at present. The negatives are slowly developed by the Metol-hydro- quinone. The finer cirrus clouds sometimes taking forty minutes or longer to develop. The two stations are connected by telephone, and are also pro- vided with a telegraph key and sounder, through which time- AUSTRALASIAN Assoc. ADv. Sc. VoL. VII, 1898. PLATE Xili. Cloud Observations tn Victoria. By P. BARACCHI, F.R.A.S. VIEW OF THE CLOUD CAMERA IN THE GROUNDS OF THE MELBOURNE OBSERVATORY Showing the guides, C C, in the opening, R, for inserting the dark slide. fem i AUSTRALASIAN Assoc. Abv. Sc. VoL. VII, 1898. PLATE XIV. Cloud Observations in Victoria. By P. BARACCHI, FRA. gener se is VIEW OF THE CLOUD CAMERA, SHOWING ARRANGEMENT OF APPARATUS FOR TESTING THE VERTICALITY OF THE AXIS OF COLLIMATION. A The camera, permanently pinned to the stone pier, B. R The dark slide in position ; lid drawn out for exposure. K Exposing shutter. C Tripod for the support of testing apparatus. S Levelling screws for the support of testing apparatus. T Telescope. H Micrometer carrying cross wires. D Slow motion screws displacing the telescope m two directions, at right angles, G Bohnenberger eye-piece. W Telephone. Y Ordinary telegraph key connected with the other station, I Sounder for telegraphic communication. 7 Pr _ = ~ Ls 7 ¢ 6 " “ - =" = -» a. : = 4 ' > =i 7 My 7 ; 7 ’ ir . a i : i : = : Pi ; a : . athe =e : : : a , 3 ; ? 5 4 t : an mee re 7 a cf - oe le oe i eo . ‘ 7 _ iz P ar is . — —- 7 - cor _ “) , oo © % 7 7 a : . = 7 - - AUSTRALASIAN Assoc. ADv. Sc. VoL. VII, 1898. PLATE Cloud Observations in Victoria. By P. BARACCHI, F.R.A.S. Plate No, 124 taken from the grounds of the Melbourne Observatory. XV. Pair of photographs taken simultaneously from the terminal stations. Date, 25 October, 1897, 9h. 3lm. 30s. a.m. Exposure, 1-25 see. Form Alto-Cumulus. Height of central parts, 21,780 feet. AUSTRALASIAN Assoc. Apv. Sc. VoL. VII, 1898. PLATE XV. Cloud Observations in Victoria. By P. BARACCHI, F.R.A.S. Plate No. i24 taken from the roof of Parliament House, Melbourne. PHOTOGRAPHIC DETERMINATION OF CLOUD HEIGHT AND VELOCITY AT MELBOURNE. CLOUD OBSERVATIONS IN VICTORIA. 265 signals or clock-beats are transmitted by the Observatory according to a code, and the last of a set of five beats sent by hand indicates the instant for exposure, which is made simultaneously by the two observers by means of a Picard shutter worked instanta- neously by the usual india-rubber ball method. The ten pairs of photographs before you were selected amongst the best and the worst. They are enlargements on bromide paper twice the size of the negative. The heights of the respective clouds were determined by measuring a few corresponding points by a millimeter scale, and vary from 17,212 to 37,682 feet. The fine cirri, though sometimes barely visible on prints, can be measured fairly well; but the direct measures from the negatives are far more satisfactory. Under ordinary conditions the highest clouds can be measured within a probable error of 500 feet. The illustrations (plates XIII, XIV and XV) show two views of the cloud camera in use at the Melbourne Observatory, and a pair of photographs of alto-cumulus cloud, taken simultaneously from the terminal stations. No. 11.—THE TESTING OF REFLECTING SURFACES. By P. Barracui, F.R.A.S., &e. [ Abstract. | THE author, after a brief introduction on Focault’s methods of testing reflecting concave surfaces used in various forms of reflect- ing telescopes, deals with the optical theories upon which these methods depend, and explains, by the aid of diagrams and records of actual experience, how the arduous process of figuring a surface into the required form can be safely guided by a knowledge of the amount of aberration at the centre of curvature, measured in zones over the whole surface at brief intervals during the last stages of the work. This is followed by a description of the apparatus with which these testings and measurements are made. (The apparatus in actual use for this purpose at the Melbourne Observatory was exhibited on the table for inspection.) The paper then treats of the method for testing the combined effect of the two reflecting surfaces of the Cassegrain telescope before they are mounted in the tube. The arrangement of the mirrors under test is represented in attached diagram, in which is traced the path of the rays from their passage through a small diaphram placed in front of the artificial source of light (a small kerosene lamp), to their converging point at E where they enter the eye of the observer. The details of the special case of testing the two mirrors of the Great Melbourne Telescope, as practised at the Melbourne Obser- vatory, are given at length, showing the separate and combined 266 PROCEEDINGS OF SECTION A. values of the aberrations of the two surfaces at their respective centres of curvature, which determine their actual form, and finally indicating the manner in which an error in the curvature of one surface may be compensated by an appropriate correction in the curvature of the other. In diagram below, which shows the arrangement of the mirrors under test, A is the primary or conave mirror 4 feet in diameter ti & ANIFE coce_ Qe @ | DIAGRAM SHOWING ARRANGEMENT OF MIRRORS OF THE GREAT MELBOURNE REFLECTOR DURING THE PROCESS OF TESTING AT THEIR CENTRE OF CURVATURE. and 366: inches focus (approximately). a is the secondary or convex mirror 8 inches in diameter, and 74# inches focus. Lis the source of light (a kerosene lamp) in front of which is placed a small diaphram O, => inches aperture. E is the place of the eye situated behind a small vertical knife-edge O', which is capable of being moved with a gentle motion across the line of sight. The diaphram O is located at the centre of curvature of the mirror A, and the mirror a is so placed that its centre of curvature C is at approximately the same distance from mirror A as the diaphram O. Then the rays of light diverging from the aperture O fall on mirror A, by which they are reflected towards the point C ; but on encountering the surface a they are reflected back along the fainter lines, diverging from C', and fall again slightly displaced on mirror A, by which they are again reflected at a point O' near the knife edge, from which point the observer views the effect produced when the knife edge is being moved across. The form of the surfaces is determined by the length of the radius of curvature of each of their elementary zones. Wooden diaphrams are accordingly placed before mirror A, by which the whole reflecting surface can be subdivided into concentric rings 3 inches wide, varying in diameter from 45 to 12 inches, one ring at a time THE TESTING OF REFLECTING SURFACES. 267 being exposed in succession, while the rest of the surface respec- tively remains covered. For each exposed zone the point is found along the axis of mirror A, where the knife edge, on being moved transversally across the path of the rays, shuts out the light suddenly and symmetrically from the whole area of the bright ring. This indicates that the knife edge crosses the cone of rays, reflected by that ring, exactly at the vertex, and therefore determines the centre of curvature of the ring. The amount of longitudinal displacement of the knife edge, which is required in order to meet in succession the vertex of the cone of rays reflected by the other rings, determines the difference in the length of the radius of curvature of the successive zones, which displace- ment is capable of being accurately measured by a micrometer to within + > ths. of an inch, or less. In this manner the form of the primary mirror is first deter- mined separately ; then the secondary mirror is introduced, as shown in diagram, and new readings are taken for the combined surfaces. From the data thus obtained, by eliminating the observed aberrations for the great mirror, those of the convex mirror, and thence its form, can be ascertained. These observations are of extreme delicacy, and require to be ‘carried out in the middle of the night, when everything is quiet, and a fairly uniform and constant temperature can be more satisfactorily attained throughout the buildings where these tests are made. It is shown, in conclusion, that with the Cassegrain telescope the best definition is obtainable when the form of the primary mirror is a paraboloide, and that of the secondary a hyperbolide ; that deviations from these forms in the two surfaces when acting in combination, will generally tend to compensate each other, and will be entirely neutralized when the amount of error in the convex mirror is double that of the concave mirror. Consequently an error in the concave mirror is doubled by a perfectly figured convex mirror; also that an error in the convex mirror is not altered in quantity by a perfectly-figured concave mirror, but is by the latter changed in kind ; so that, if overcorrected, it would, in conjunction with the concave, appear undercorrected, or give in combination, the same image as an undercorrected concave surface acting singly. No. 12.—A GENERAL EXPRESSION FOR FLOW IN TUBES. By G. H. Kniss, F-R.A:S., LS. (Read January 11, 1898.) 268 PROCEEDINGS OF SECTION A. No. 13.—THE SOURCE OF THE PERIODIC WAVES WHICH ARE RECORDED FROM TIME TO TIME ON THE SYDNEY AND NEWCASTLE TIDE- GAUGES. By H. C. Russetz, C.M.G., F.R.S., F.R.A.S., de. (Read January 11, 1898.) [ Abstract. | A.most from the first day the Sydney and Newcastle self-recording tide-gauges were established—the former in 1867, the latter in 1871—LI have found on the daily record sheets from time to time periodic waves recorded with the tidal curves. The period is usually about twenty-six minutes. In 1868 we were surprised by the records of waves of unusual dimensions, some of which caused a rise and fall in Sydney harbour of 3 ft. 6 in. These waves continued to reach our coast and record themselves for four days, z.e., August 15, 16, 17, and 18. Such an unusual display indicated unusual energy somewhere, and the waves were soon explained by the news of the great earthquake at Arica, in South America. One account, given to me by Captain Conlon, who was passing Arica at the time, throws some light upon the character of the waves. He was then the captain of a large steamer running from London to San Francisco, and was passing Arica at the time of the earthquake. ‘The shocks,” he said, ‘‘ were extremely violent, and everything that was breakable in the steamer, even to the binnacle lamps, was thrown down and broken. It felt as if the steamer was struck violent blows from below, which made her shiver from end to end as if she was going to pieces.” From the shore mighty waves rolled away towards Australia across the Pacific Ocean at the rate of 360 miles per hour. At Sandwich Islands they were still 40 ft. high, and at New Zealand they were 6 ft. and in Sydney, as stated above, 3 ft. 6 in. In 1874 and 1877 and other years we have had similar waves, and I have been able to trace them to reported earthquakes ; and in the intervals between these larger disturbances we have had recorded frequently periodic waves of the same character but much less amplitude. At first these were credited to unknown earthquakes, but from time to time instances occurred when earthquakes took place and there were no periodic waves. Some of these were evidently due to great storms in Tasman Sea, but PERIODIC WAVES. 269 there were many not explained. Then came the great earth- quake in New Zealand, on June 10, 1886, when the Pink Terraces were destroyed, but no periodic waves were recorded ; the earth- quakes in South Australia, August 22, 1896, and many others which left no trace on our tide-gauges, although in the intervening years many periodic waves were recorded. Captain Allan, the late harbour-master at Newcastle, who had charge of the tide-gauge, observed in a report to me “that when the tide-gauge sheet showed sharp-pointed, oscillating marks, a gale followed within forty-eight hours, accompanied with high tide and heavy sea.” He continued :—“T also have observed that, although the tide- sheet may show considerable oscillation of a rounded character, it is not always followed by a gale. It is only when the pencil shows sharp-pointed, zig-zag lines along the tide curve that a gale may be looked for, and the more defined and the greater the range of these zig-zag lines the heavier the coming gale.” The frequency of these periodic waves had long before led me to look amongst ordinary meteorological conditions for something which would give rise to them; and the daily weather-chart, giving a synoptic picture of all the weather conditions, made evident the possibility of the origination of an impulse such as would generate waves. About every seven days an anticyclone passes over Australia, and between one area of high pressure on the next one, there is always an area of low pressure called a A depression in which is the lowest barometer, and the sides of the A have the steepest grades, on the preceding side of the A are strong N. to N.E. winds, and on the following side strong 8. to S.W. winds. The change of winds is sudden and the southerly winds is one of the strongest we have. The barometer sometimes falls to 29:000. Under such a low pressure the sea rises and currents set in on all sides except the north, and there the mainland of Australia is found and cannot supply the demand for water, so that the currents into the A set in from the other sides. During this time the whole system is travelling to the east, accelerating the currents into the centre, until when it approaches Bass Straits all the easterly current is cut off by Tasmania, except that which comes through Bass Straits ; meantime the falling barometers have accelerated the constant southerly set of the east coast current, making it a very strong northerly current which meets the storm centre ; with its westerly and southerly currents in Bass Straits, a confined area, in which by the meeting of these currents, the waves are set in motion which we find recorded on the gauge. This southerly setting current is so vigorous that it continues to set to south in opposition to the strongly opposing southerly winds which meet it as the centre of the A depression passes. This fact is well known ; Captain Dawson of H.M.S. “ Waterwitch” informed me that it was well known 270 PROCEEDINGS OF SECTION A. that the stronger the southerly wind the stronger was the current setting south against it. The strength of the southerly depends: upon the depth of the A depression, and the lower the barometers, the more the southerly setting current is accelerated. The theoretical condition given above therefore is in exact accordance with the observed conditions. This becomes more evident if the contour of the coast lines is examined, for the south coast of Australia and the west coast of Tasmania converge into a funnel-like area, in which the wind and sea currents generated by the low pressure converge from opposite directions, and meeting in this comparatively confined area generate the periodic waves which are recorded on our tide-gauges at Sydney and Newcastle. We find that the lower the barometer in the A is as compared with Sydney the greater are the waves recorded on the tide-gauge. It is of importance to note here, that there may be a very low depression travelling along the south coast rapidly, in some cases, at twice the usual speed ; and when this is the case, as shown by many instances carefully examined, there are no periodic waves, such as are found when the low pressure is travelling slowly, and the reason appears to be, that there is not time enough for the ocean currents to be set in motion before the depression has passed by ; barometers fall and rise as usual, but the ocean is not sensibly affected, for water takes time to adjust itself to the varying atmospheric pressure. It is a strong confirmation of the foregoing theory to be able to say, after a careful examination of the records since 1867, that 62 per cent. of the cases when periodic waves have been recorded on our tide-gauges, they have been coincident with the passage of A depressions such as I have described above. The probability is that a number of periodic waves are set in motion by storms in Tasman Sea, and of those recorded I have traced 1 per cent. of them to that source, which is as much as could be expected when we remember that in the past the logs of vessels crossing that sea have not been recorded. In Lake George T have had a self-recording anemometer and a tide-gauge at work since the beginning of 1885, and there, periodic waves are very frequently recorded, and clearly shown to be the result of violent gusts or squalls of wind on the lake. Lake George is about 16 miles long (its length is affected by rain) with a depth where deepest of about 20 feet. On the western side there are high hills, and the lake is longest from north to south, so that the wind generally blows up or down the Jake; and sometimes a squall of wind will force the water to one end and make it as much as 18 inches above its normal level. The water then flows back and keeps up its periodic motion, flowing backwards and forwards for several days, with a period of 2 hour 11 minutes, the rise and PERIODIC WAVES. 272 fall gradually decreasing, until the impulse is spent. I have mentioned Lake George here only because the effects of gusts of wind in producing periodic waves is so very clearly shown in the records of the anemometer and lake gauge, that there can be no doubt as to the connection between squalls of wind and these waves, and the experience gained at Lake George has led me to suppose that it is extremely probable that periodic waves are set in motion by squalls of wind in Tasman Sea. Upon comparing the reported earthquakes with our tide-gauge records, I found 10 per cent. of the recorded periodic waves on our tide-gauges coincident with earthquakes. We have thus accounted for 73; that is, 10 from earthquakes, 62 from waves in Bass Straits, and 1 from storm in Tasman Sea—in all 73 per cent. of the periodic waves on our tide records—leaving 27 per cent. unaccounted for. I feel sure that a more complete knowledge of the meteorology of Tasman Sea would account for more than half of the 27 per cent. at present unaccounted for. No. 14—NOTES ON COMPARISONS OF STEEL AND IRON LINEAL STANDARDS FOR - GEODETIC PURPOSES. By D. M.. Marruanp, LS. (Read January 11, 1898.) 272 PROCEEDINGS OF SECTION B. SECTION B. CHEMISTRY AND MINERALOGY. No. 1—ON THE COLOURING MATTERS OF WINES. M. Biunno (Licenziato in Scienze), New South Wales Depart- ment of Agriculture. (Read, Friday, January 7, 1898.) [ Abstract. | Tue author refers to and discusses recent investigations in this subject by M. Rosensthiel and Gautier. It is well known that the juice, even of red grapes, is nearly always colourless. This was attributed to the insolubility of the colouring matter in water. Rosensthiel’s experiments have how- ever shown that at a temperature between 50° and 70° Centigrade the unfermented juice is capable of dissolving colouring matter. These colouring matters are very unstable and are attacked by nearly all metals. At such a temperature air is a remarkably powerful decolouriser, and is capable of rendering the red colouring matter insoluble in alcohol. If unbroken grapes be heated to 50° Centigrade in a hermetically closed vessel, the wine produced in crushing and fermenting these grapes will not be red. It is therefore necessary to exclude the air if the colouring matters are to be kept unaltered. These experiments are of practical importance, because the treat- ment above described not only renders the colouring matters soluble and stable in the must, but destroys the Saccharomyces, while germs of mould and bacteria are hindered from developing. It would from this appear quite possible to destroy the natural ferments by pasteurizing must and skins together at 50° centigrade, such treatment being without effect upon the colour and taste of the resulting wine. Rosensthiel recommends heating three times to 50° when all natural ferments are destroyed and fermentation may be brought about by means of selected yeasts. THE COLOURING MATTER OF WINES. 273 When suitable appliances shall have been devised for carrying out this operation on the large scale, the problem of the use of levures pures will have been solved. M. Gautier’s experiments to which the author next drew attention, have reference to the chemical composition of the colouring matters of wines. M. Gautier finds that each variety of grapes has its special pigment which differs in its centesimal composition from those of other grapes. Further, on cross-breeding between two varieties of grapes, the cross-bred contains a new colouring matter whose centesimal composition is the mean of that of its parents. Gautier draws the conclusion that in cross-breeding there are not only morphological, histological, and physiological variations, but that even the chemical substance of the cells undergoes variations, and puts forward the suggestion that the variation of species may be due to chemical changes which take place within the molecules of the tissues and pr otoplasm. No. 2—THE MOLECULAR MECHANISM OF AN ELECTROLYTE. By W. M. Hamtet, F.1C., FCS. (Read Friday, January 7, 1898.) No. 3. — NOTES ON THE COLOURING MATTER OF ERIOCOCCUS CORIACEUS, AND THE WAX OF CEROPLASTES RUBENS. By E. H. Gurney. (Read Friday, January 10, 1898.) [ Abstract. | I, ERIOCOCCUS CORIACEUS. THE scale insect, Hriococcus coriaceus, is generally found encasing the young shoots of the Eucalypti, especially those springing from. old or burnt stumps. It occurs around the stems in closely packed clusters of small pinkish-white sacs. It is of rather frequent occurrence all over New South Wales, though it probably exists in quantities too small to make it of commercial value. Ss 274 PROCEEDINGS OF SECTION B. The following analyses may be regarded as fairly Bias ci § its composition : — Moisture ie aa ae TOES 18:49 Volatile and organic ... ae 77°44 79-00 BASING ays. ee a aee 2-64 2°47 99-99 99-96 The scale, treated with solvents, gave the following percentages of extract :— Cold water .... bs is ... 17:35 per cent. Cold ether Se a. ee we ~~ DB2°56 5 Boiling ether ... Ms us 31250 - Cold absolute alcohol . sive cat || Mell 95 Boiling ,, mg Mercer sete a. d433 Ne Wool and silk dyed with this colouring matter, and mordanted with aluminium, tin, chromium, and iron, produced the following colours :—Light amber, ight orange brown, brown, and sage green respectively. In these experiments no colours of any great brilliancy or dis- tinctiveness were obtained, and with alkali all the colours were changed more or less to a pinkish or purplish tinge. These facts, taken in conjunction with the somewhat scarce source of supply, and the position of the azo and alizarin colours in the dyeing industry, would seem to point out that the colour of this scale is valueless as a dye. In volumetric work, used as an indicator, this colour proved as delicate as cochineal and litmus, but, owing to the very faint indication which it gives of the change from acid to alkaline solutions, and vice versd, it is of no particular value in such work. II. CEROPLASTES RUBENS. The wax-bearing scale insect, Ceroplastes rubens, occurs in only one or two localities in New South Wales, though in Queensland it is considered as a destructive pest. The scale has a pinkish-white appearance, and when thrown into water, floats upon the surface. The brittle shell of wax is easily broken with the finger, and is not very sticky when handled; it has very little taste. The scale, heated and strained through a fine cloth, gave 38 per cent. of wax ; whilst extracting the scale with solvents the follow- ing percentages of wax were obtained :—Absolute alcohol, 83 per cent. ; ether, 86 per cent. ; and benzine, 88 per cent. The melting point of heat-extracted wax was 60° C., and that of wax extracted by solvents 55° C. Specific gravity of wax at THE COLOURING MATTER OF ERIOCOCCUS EUCALYPTI. 275 23° C was 1:03. Upon organic analysis, 100 parts of purified wax gave C 78°22, H 11:01, and O 10°77, therefore the com- position of the compound was supposed to be C,,H,,0. A’ comparison was made between this wax and that of the scale Ceroplastes ceriferus :— The details in connection with the wax of Ceroplastes ceriferus were taken from Jndian Museum Notes, Vol. II, No. 3, on ‘‘ White Insect Wax in India.”—K. C. Cortes. Ceroplastes ceriferus. Ceroplastes rubens. Melting point oe \ ue S ee 2 At 15° C. At 23. Specific gravity he 1-04 1-05 Supposed aaa of wax, calculated from percentage ( ee Bel composition The wax has no value as a varnish, and it burns with a smoky flame and resinous smell. The supposed formula C,,H,,O, must be considered as tentative only, until further combustions have been made upon larger quantities of purified wax. No. 4. METALLURGICAL METHODS IN USE AT BROKEN HILL. By G. H. Buakemore. (Read Saturday, January 8, 1898.) I HAVE ventured to think that a short history of the methods of ore treatment in vogue at Broken Hill of this Colony, may be of some small interest to members, more particularly to those interested in the mining and metallurgy of silver ores. To most mining people there is a never ending interest in the methods of ore treatment followed in the various parts of the world ; in the complications arising and the difficulties experienced in the several operations leading to the successful financial end that shareholders naturally expect. Too little is known or written on the vast subject of metallurgy, no matter of what metal (if we except steel and iron), and a wider spread general information would have saved the untold sums of money which ignorance has wasted. Too iittle credit is given by practical mining men to the 276 PROCEEDINGS OF SECTION B. advantage of a scientific education and its achievements, and it is a well known truth that the money paid to a mine manager of latter day attainments is grudged, whilst assayers and metallurgists are looked on as luxurious superfluities. Time and investors’ common-sense will put an end to idle superstitions such as these, and the hour is coming here, as it has done years since in America, where the practical miner takes second place to the educated man. All these truisms simply help me to say that Broken Hill has suffered in the past from such mistakes as these ; but the good sense of the old directors of the Proprietary Mine ‘asserted itself, and brought out to the country such men as Patton, Schlapp, and Howell, whose methods of mining and treatment of silver lead ores on a large scale are a standing object lesson to the Australian mining world. I do not propose, in this paper, to deal with the mining part of the question, but simply to take up the methods of ore treatment adopted at the Proprietary Mine, which practically describe the metallurgy of silver and lead in Australia. ORE TREATMENT. This will be described in the following order :—Blast-furnace smelting, lixiviation and chloridising, amalgamation and concen- tration. Smelting.—One great drawback to the smelting operations was the irregularity of the composition and value of the ore, and the absence of bedding floors at the furnaces, for the ore to be received in as it came from the mine, made this point more acute, and, together, have caused great monetary losses to all the companies who smelted their own ore. The following series of analyses of the smelting ores of the Broken Hill Proprietary Mine will show how the ores varied, and this variation took place not daily, but hourly, requiring constant care and attention to get the best work possible from the furnaces at the minimum of cost. Manganese Ironstone (used as flux). Bby/s Ag; ozs. Fe %. Mn %. CaO %. | AIIOR Shih SiO, Z%. 7 3°00 15°0 21:0 “90 8°0 2°6 11-4 15 4°0 14°4 PSSA MN Pepa 8:0 ME7/ DDT, 11-0 32:0 10°2 GSS tpi RCRA. wilt ees ove Ul REE aes 32°8 15:0 9-0 10°8 SSO Mala syscas eal isn, o-eee inde ees 29:0 11:0 13:0 10-0 GES RG atsoctccwe ll Uh cceas Rell orcas: 32°8 16:0 26:0 118355) GSO Gl cease, dl eee I aN ses 28°6 15:0 LO Hales ah ee |Veteaar ee td) hy Sere TE ee 29°8 Kaolin Ores. Lead ¥ Ag; ozs. Fe 7 Mn %. CaO %. | AlZOs A: Ae $10, 13'0 60°0 12°8 14°4 0:9 14°8 ls 33°0 8:0 62°0 13:0 NR | eset 14°4 3°25 33°0 8:0 SOOM Rosen corn lt coc: lt eetoseet. IP etcees le eae De eeeenes 10°0 SOND erate sae Phil acs cseeen | ereeetece me! rere oregon: | cents at || MN ere 8-0 IL} A deren) linn Sm a bee A aes |r ne Rt ne Ader aA Boos bree 9:0 OOF sessed) IH SRR ait a|Ne See ay a) 8 corte a ha hae k ryt PR 10°0 ANNE O J See nena (RN ree Te reer] NRL So | eee |e Carbonate of Lead Ores. Pb. Ag. Fe. Mn. CaO. Al,O.. Zn. SiO,. 24°0 12°0 6:0 ° 4°5 0°6 8-4 2°0 30°3 37°4 17°60 ould eS Siu lamer comet IWR feet cia. ll cence 25:0 29:0 20°0 4-9 nae) waecces 8:0 2:4. 40°2 150 SEMPRA re, a cemeg nai TASA READ GIR US” ery dll Qe awa Pha ae 14°0 GZEO Ca eB ee Sa PEP ae eal end a cess HS ies ARES oe 12-0 SSO fly cere || eke eevee cud lene shefctorny ob Ilk ters, cose UN Netstea tee | aaa 15:0 Dosis Ui tall ae ara We A eer, 2 Ngee kes Sal ape ctr fae PR aoc 17-0 ZOO alt -sesces- Ui A sSoea hill) cosacteial le maceariaeill. pateeeee. ll peeerets Crude Sulphide Lead Ore. Pb. Ag. Fe. Mn. CaO. Al,O3. Zn. SiO, 28-0 19°0 3°8 TED epee gy) 16°4 PES 26-0 16:0 3°6 12 alae tees 2°1 Ney; 26'4 21:0 16:0 See cow C'llaicdec se kl Mae eeu eee 2200 iia hese 24:0 VSO} | sites wi igs cetera Mun elaeee 40:08) | abies 25°0 A Ole le Beackee 4 csee aden let eacteenetge al MM Sees a0) | noose 22°0 POGOE al Wetescal Wea tna see eet etal Ibe ek PANY Nh eposde 32°0 TBO) Mee le yee tel De a ee cee Z2OsO Meee. 278 PROCEEDINGS OF SECTION B. Sulphide Concentrates. Lead, per cent. ...| 60 55 66 66 69 67 65 64 SilversiOz7. Vass.) 21 19 19 22 21 2320 19 Zinc, percent. ...| 8 9 8 | 8 8 7 76} 10 The chief end that the metallurgist in charge had to keep in view was the output. He was not asked simply to smelt the ores, but was also required to vary the charges in such a way as to keep the weekly returns of silver and lead nearly even. The silicious kaolin ores are the chief source of silver, and a glance at the assays given above will show how these vary in value and composition, and, as pointed out previously, not daily but hourly. The indicator of the daily output was the assay of a small sainple of lead, called the ‘dip sample,” taken directly from the “well” of the furnace once every twelve hours, and, as the assay showed a rise or fall in silver, the charge was changed accordingly. For instance, if the “ dip assay” showed a drop in silver, and the returns were not good enough for the part of the week which had elapsed, it was often necessary to sacrifice a nice, economical charge on the furnace, and replace some low grade basic ore by the silicious and troublesome kaolin ore to raise the value of the bullion, and, correspondingly, the week’s output. Or the reverse condition might have to be considered. It is simply impossible for the mine to regulate the assay value of the ore (which is the sole thing the mine part of the organisation looks at), because in the kaolin stopes the faces may be ‘all or part in low grade ore for some hours, perhaps days ; and without any change in the appear- ance of the ore, the assays suddenly rise or fall. “In a large mine such as the Broken Hill Proprietary, where the demand made by the furnaces is great and imperative, it is impossible to keep the ore stored in the stopes until the assay value is known, and usually the ore is in the smelter bins, and probably in the furnace, before the underground manager knows its value. This is not an advan- tage, especially if we regard it from the metallurgist’s point of view, who is asked to keep the return steady, otherwise it is seldom that any absolutely useless ore is sent to the furnaces for the want of the assays or means to store it underground. One needs to see and know the tremendous ore body of the Proprietary Mine to quite grasp this assertion ; but if I say that all the ore carries silver, whether the lode is 300 feet wide or 3 feet, it will be readily understood that, with constant experience of the pecu- liarity of the ore, the underground manager can judge very closely from his previous results what the average value of the ore will be each day ; but it is to be clearly understood that there is no abso- lute guide to the ores’ value except experience of the ore body’s idiosyncracies, when assays are not available at once, nor any METALLURGICAL METHODS AT BROKEN HILL. 279 economical means which can be used to allow of the ore being stacked underground until the results of its value are out. The demand on the mine by the smelters partly brings about such a condition of irregular values in the ore, and nothing can be devised to remedy it, when a mine has a body of ore which is so eccentric in value as that of the Proprietary, and has to keep up its weekly tonnage and output, except large bedding floors. From these remarks, the study may be slightly seen which the man in charge of the furnaces has to make of the character of the ores being smelted. Regarding the slag that will be made, he contents himself by forming an opinion of the silica contents of the ore as it lies in the furnace supply bins, and on that opinion adheres to or changes the running furnace charge. In addition to that, he studies his furnaces and notes all the various signs of the tuyeres, the way the molten slag fall into the slag-pot, the speed the furnace is smelting, &c., and with practice will make the right change ; but so often does the character of the ore alter from silicious to basic, and wice versd, that it is not uncommon to have to make from two to six radical changes in the constitution of the ore charge every day. Experience of the ores one must therefore have to attempt to run the Proprietary blast furnaces under the ruling conditions. The absence, then, of bedding floors, with such a variable ore, is a serious detriment to good smelting. The skill of the most accomplished metallurgist would be at fault without he possessed the power to judge, fairly accurately, the ore in the bins each morning, and even with long practice mistakes are made very often, for a man cannot last the whole twenty-four hours of every day, and therefore does not see the ore which is delivered from the mine during the night; and the basic or silicious change which he had made in the charge the previous afternoon might have been unnecessary if the ore could have been seen by him _ before hand. Hence for some hours an entire waste of flux has gone on, which gets to be serious with eighteen furnaces in full blast. I am somewhat afraid that my metallurgical critics may not quite understand the points in this ore irregularity and the impossibility of arresting it, and probably describe the method of the metal- lurgist as more guess work than brains, and therefore it is well to say that the ‘‘ guessing” point of the problem is assisted in every way by regular daily assays of the ores with their principal com- ponent parts, such as silica, iron, manganese, and zine, together with careful bi-daily slag analyses and slag assays from every furnace, made for lead and silver, together with special samples of slag for the same metals taken promiscuously from the furnaces during each day. With the aid of these very close work can be done, and the ability to judge the molten slags, as to their lead and silica con- tents, is also of the very greatest assistance to the general end. 2°80 PROCEEDINGS OF SECTION B. This digression, if it can be so called, is rather long, but it is well to have plainly understood some of the difticulties which had to be overcome before in reality a pound of ore could be smelted. THE BLAST FURNACE PLANT. The furnaces belonging to the Proprietary were 16 in all, divided into two sheds, called the north and the south smelters. The firstnamed contained 9 brick-shaft furnaces 60 inches by 112 inches inside measurement. The 9 furnaces were supplied with air from a common main, the blast being supplied from 6 No. ‘3, il No. 5, and 3 No. 44 Baker Positive Blowers, driven by a pair of horizontal compound surface- condensing engines, 164 inches and 26 inches cylinders by 40-in. stroke. A ‘stand- by engine was of the marine type, and was styled a tandem compound condensing engine, cylinders 14 inches and 24 inches, with a 30-in. stroke. Steam was supplied from 2 Lancashire boilers, 7 feet diameter and 23 feet long, and 2 Cornish boilers 6 feet sfmnaiee and 25 feet long, fitted with 1 5-in. by 4-in. by 8-in. Knowles and 1 5-in. by 6-in. by 8-in. Tangye boiler feed pumps. All the 9 furnaces delivered their smoke, by means of downcast flues, into a common culvert delivering into a wrought-iron stack 196 ft. high and 11 ft. in the clear at the top. The slag was hauled away from the furnaces in two-wheeled slag-pots by manual labour; later on it was handled with large pots, two on a carriage, pach pot holding about 1 ton of slag, horses doing the haulage. On the feed floor the charge wheelers were elevated from the ore bins 2 the level of the feed floor by 8 hydraulic automatic lifts with 7-in. rams. All slag, matte, flue dust, dross, &ec., that had to be Era: through the furnaces were lifted by a double- friction hoist, 7-in. diameter cylinder and 10-in. stroke. The south smelters consisted of 6 brick-shaft furnaces, 60 inches by 112 inches, and 1 small matte furnace. The products of com- bustion were drawn off into a common flue and distributed into the air through an iron stack about 150 feet high and 10 ft. 6 in. in the clear at the top. As with the first set described, the furnaces were supphed with air from a common blast pipe. The air was supphed from 5 No. 7; Baker Positive Blowers, actuated by a pair of horizontal engines, cylinders 164 inches and 38 inches stroke, and 1 Westinghouse standard engine, 154 inches cylinders and 14 inches stroke, as a relieving engine. Steam was supplied from a nest of 5 Lancashire boilers, each 7 feet diameter by 23 feet long, fitted with | No. 4 Knowles’ and 1 No. 5 Blake boiler feed-pumps. In addition to supplying the south smelters with steam, this installation of boilers supplied the pumping plant, which handled the cooling water of both nests of furnaces. METALLURGICAL METHODS AT BROKEN HILL. 281 In the pump house are the following :— 1 horizontal compound condensing engine, 164 in. by 26 in. cylinders by 48 in. stroke. 2 sets of double plunger pumps, 9 in. by 36 in. 1 set bucket pumps, 12 in. by 24 in. 1 Knowles’ compound condensing pump, !6 in. by 26 in. by 24 in. and 17 in. plunger. 1 Tangye steam pump, 10 in. by 6 in. by 24 in. 1 Blake bucket pump, 10 in. by 8 in. by 24 in. 1 Blake double plunger pump, 10 in. by 10 in. by 18 in. 1 Worthington duplex tank pump, 16 in. by 16 in. 1 Worthington compound pump, 6 in. by 10 in. and 10 in. by 84 in. cylinders. All the water from both sets of furnaces delivered into cooling dams, from whence it was elevated by the above pumps to large wrought-iron tanks situated at a higher level than the furnaces, and from these tanks the jackets of the furnaces were supplied. The whole of the works and slag dumps are lighted by electri- city, and are connected with telephone to the general office. In addition to this large and efficient plant, the Proprietary also leased the three 100-ton blast furnaces on the British Mine. A. description of these furnaces will be given further on. The complete equipment of a lead blast furnace plant at Broken Hill is a matter of some expense. | According to the number of furnaces, so the size of the engine increases, unless combined engine and blowers are used, with building and flue space. — For a single blast furnace of what is known as a 100-ton furnace, the following material is required, exclusive of engine building, flues, and stack :— i 8. “dl: 1 Blast furnace at foundry (ironwork only)............ 1,000 0 O 2 100 I.H.P. Lancashire boilers, each £450 ......... 900 0 O iPa00medibricks: 63 lbsy per e000 Mrenten.cte os-cscescce ay IPA (6) 2,500 fire bricks for crucible and flue, at £10 per 1,000 Py (0) 0) 11 casks of English fireclay, at £7 per ton ............ 21 0! +0 INon 7s) Baker or Roots? blower es. .n-ceccrcseseeeeees 400 0 0 1 Steam pump of 30,000 gallons per hour capacity 250 0 0 Amilrocksitor slag snG&c:,, 1 2each sa. scueconee soem eeee 48 0 0 4) [Bynilliorm TaRKel techs Sa3 @eKolsl) SA nnpoohhonnocaocsouonsesce son 1 () (0) EDOM A emye SCall Oscars ceisaicaaerdeteeerie aise BEA HosDObe 200) 70 DIES AS POLS EAC HVS) LOS... Siiiesconoes sac aeomororeent ae 156 0 0 SUsbulliom moulds each Sy o..-seqesecdcerenceseecareeee 22) 110) 0 BATE LOLFSATINGS .vajniscisicisesioaceneosiancoeeeeteeaeeeeee: 3) ORO 200 ft. canvas hose ............ Jilsis gaaléciaina aid sles pitch eM SE WERE 10 0 O HOORES Jem! lndiasrulbber hosess...scs-nunesesess-eeceeeeee a: OF 0 100 ft. 2-in. 3 A Ont corte rere cacicth cast. 1210 0 2 Lead coolers and frames, each £5...............--.<-. LOMO) 0 Geltadiles; each! 68hGdky. csc. csceeee eats ea eee IL alg) @ GuSkimimerns;, Cachross.1.-sseeetee cee tree eee eeee Or 0 Steel for tapping bars and for barring crust off firnmace: Wall Sis Ak. ana scaeuosoneneasmene seme e occ: 10505 0 4 *‘Stoppers ” for stopping slag, each 7s. 6d. ...... LOMO 1 Set 1 in. steel letters for branding bullion ......... 012 6 bo oo bo PROCEEDINGS OF SECTION B. 1 Set 1 in. figures for branding bullion ............... 7 Wrought steel barrows for wheeling ore charges, CEVOla 224 IBS. Concedes poconosadeceseaeD seoapHooBoSsoLaCddD Coke barrows; each! £45 Ost). scecsacnce tern euesent Pot for re-melting scrap lead and sweating lead A OM GUGOSS aa crdeiielssiie aS woisceoarr rel au siecle slelss viaclosean 1 Hoist for elevating bullion, slag, flue-dust, &e.... 4 14-lb. sledge hammers and handles, each 10s. 6d. 2 No. Sshort-handled shovels, each 3s................ 6 Long-handled square-mouth shovels, each 3s, 6d. 1 complete set of spanners to fit all nuts ............ I S-beamicharounoascalenaneccsscmeeicosseccassoncscen ee Labour of erecting furnace and fittings ............... me bho ] Spare Parts. 2 Lower end jackets, each £4110 0... 9 0 O 4 Corner +3 a a 10) (0533, LOO 10 4 Side a 55 410 0... 18 0 0 12 tuyeres and corners complete, each ............0: AZ Ge 9 0) 0 Waterjacketedslagspouts,each 1 5 0... 615 O Solid slag spouts, each ......... ONO OF 100 3 Separators complete, each... 115 0... 5 5 O 3 Separator covers, each ...... CY PE Gee OO 7 4A water-breasts,each 1 5 0... 710 O 2 Bullion spouts, each ......... OG: OF 0120 6 Slag-pot handles, each ...... L 8 O5.946,20) 0 6 Be bowls Pope | asso 1D, (OF. O27 10 6 a axles At nes WO) OD) WO = TORO 200 ft. canvas hose for wind-pipe ............ 10 0 O 100) tt) Jam: India-rubber hose ®......-...-..---< 5 10) 70 NOOrite Dam #55 oo! gst, Be aneaendencnestee 2 OneG, Cord and copper- wire to bind onthe hose 1 0 0 Blowing-in Expenses. £ s. d. £ iss “id: 30 tons dry wood, at, say . 0) 34055 921) +0) 0 15 ,, lead at market price, SAY cieencosacsdasausenpeiinsria: ISP OO Of 195 050 35 tons of slag, cartage—cost pemmbon’ Tocco caceacetereree OR IIGre se LO 5 tons coke, at per ton...... ay i Obra Mey Nay 4 ,, limestone,atperton 014 0... 216 0 4 ,, ironstone, RE Le Ones £45 4) 0 Coal for steam, 10 tons, at persion! cracccseercerceceees PSS Os al LOMO ihabourtabout fumacess tercesacsereessemeesees 20 0 O Water, 20,000 gallons an hour required for jackets, for 96 hours—pumping £ Sh Gl: 012 6 19 5 0 9°0 0 20 0 0 195 0 0 2820 116 0 1 a 410" 10 50 0 0 150 0 0 3,369 0 6 123 1 6 £ 1s) id? costs at 1d. per 1,000 galllons......... 8, 0-0 Evaporation, loss, and leakage, 8,000 gal- lons, at 4s. per 1,000 gallons......... LALO ——— 289 9 0 £3,781 11 O METALLURGICAL METHODS AT BROKEN HILL. 283 At this point the expenses incurred are then charged to the ore- smelting account. They serve to show what the bare furnace, and starting it in work, costs without building, engine, fuel, or stack. No estimate has been given of these, because the condition of one furnace by itself does not exist in Broken Hill ; all the smelting works there being on a much larger scale, with everything to correspond as regards building, flue, and stack capacity. [A general design of a complete plant with two brick-shaft furnaces and space for others was exhibited. | THE WORK ON THE FURNACE. The old style of oval-shaped (horizontal section) 30-ton blast furnace, with a short iron stack through the roof to carry off the smoke—with which the era of lead-smelting was inaugurated at Broken Hill—is now obsolete, and the sight of three or four of these old furnaces on the scrap heap of the mine forcibly brings home the advancement which has been made in the general con- struction of the lead-blast furnace. The first radical change in design was made when Mr. H. H. Schlapp, late Metallurgist of the Broken Hill Proprietary, intro- duced the present furnaces at Broken Hill. Alterations were made in these by Mr. Schlapp, which improved them and at the same time made them “ handier” furnaces, and since Mr. Schlapp’s departure from Broken Hill, other small improvements, such as the introduction of the Matthewson matte separator, have assisted toward more economical work, which the fall in the silver market and assay contents of the ore demanded. At the British Mine, a more important change was made in the design by Mr. John Howell, who substituted mild steel jackets for the brick shaft of the furnace of Mr. Schlapp’s design ; and for ores which contain sulphide of lead, my experience has un- doubtedly shown that this change has been a most important one. One great trouble in a lead furnace when smelting sulphide ore, with or without zinc, is the manner in which the sulphide causes the formation of “crusts” or ‘ scaffolds” in the furnace at a point about 12 inches to 18 inches below the level of the top of the ore charges in the furnace. As the Jead sulphide reaches the smelting zone of the furnace, part of it sublimes and ascends through the loose ore and deposits again on the cooler walls of the furnace. With a brick furnace, the walls of the shaft are never so cool, of course, as the water-jacketed shaft mentioned, and the sulphide of lead and zinc seems to incorporate itself with the bricks, as if it were a part of the original erection. When this crust grows to such a size as to materially interfere with the working of the furnace, it is usual to “‘run the furnace down,” to use a technical term, or, in other words, stop putting fresh charges into the furnace and allow the level of the ore and fluxes to sink 284 PROCEEDINGS OF SECTION B. until it gets considerably below the obnoxious crust or scaffold. Then the blast is taken off the furnace, and the crust is prised off with heavy 14-inch diameter-octagon steel bars. The disadvantage of the cementation of the crust with the brick walls is then seen. The crust being all of a dull, red heat, you may chip pieces off with laborious effort, but that is all. If you attempt to clean the walls to the original form of the furnace, you find thas the crust has become part and parcel of the brick shaft, and the latter gets very much damaged in the operation, With the water-jacket walls the crust is a very different con- cern. Instead of being a solid, tough, and immovable obstruc- tion, you find that there is but one place in it that is hard, which, naturally, is the face exposed to the heat of the furnace. Behind this hard face is a mass of loose ore, which falls away as soon as the hard shell on the outside is destroyed. Then the crust does not form any sooner on the cold water jacket than it does on the brick shaft, because the attrition of the descending ore charge has effect on its peculiar form, and it is much more easily removed from the cold iron face, usually in six hours, leaving the furnace its original size. With the brick shaft this may take twelve to eighteen hours, and when left at that is not anything like clean, through the fact of the crust having filtered into the pores of the brick, and made itself a part of the structure as before described. Much has been said against the water-jacket shaft on the ground of increased fuel necessary through the amount of caloric carried off by the water ; but I think a nice looking mathematical calcu- lation is not sufficient to overcome the great advantages which the water-jacket shaft has over the brick, and besides that I never used more fuel with the water-jacket furnace than with the brick- shaft furnace. It is no uncommon thing to see a number of the brick-shaft furnaces being “burnt out,” as it is called, just above the lower jackets. Unskilful work is the natural retort; but I maintain that with the irregularity in composition of the ore, this might naturally be expected. Such a trouble is never experienced with the other style of shaft, and the test of experience has demon- strated indisputably that for good, fast, clean, and cheap work, the blast furnace which is all water-jacketed is the ideal model lead-blast furnace. Such a furnace may be described as follows :— It is water-jacketed throughout. The top half of the furnace consists of hollow wrought steel jackets with a 6-inch water space, three jackets being 9 feet 9 inches deep ; the fourth, recessed to carry the flue of downcast, is 8 feet deep. The water is fed in at the bottom of each jacket, with the view of preventing the deposition of any sediment, and the whole of the jackets are con- nected to make sure of an equal water circulation through *hem METALLURGICAL METHODS AT BROKEN HILL. 285 all. The jackets are supported by lugs, which are riveted on them, standing on an oblong frame-work of 8-inch “I” iron, the corners of which rest on four hollow cast-iron columns or pillars, serving also as waste water-pipes. The jackets are surrounded with an iron strap, making the whole a stiff and strong job. The structure at this stage, and before the lower jackets are put in place on the brick crucible, presents the appearance of a large rectangular box with rounded corners, not having any bottom or top, standing on four legs—the columns. The lower half of the furnace consists of twenty cast-iron hollow jackets, each 20 inches in width by 57 inches long. There are six jackets on each side, with a circular opening cast in them large enough to allow a water-jacketed tuyere to be entered, and these tuyeres project beyond the jackets into the furnace some 9 inches. Four corner jackets have no tuyere openings, and four end jackets (two each end) have 4-inch openings in them to admit air, but no water-jacketed tuyere. The water is fed into the top of each of these jackets, and is conducted to the bottom by a passage cast inside the jacket. The escape is from the top, and by having a pipe, bent somewhat to the shape of the letter S, the delivery of the water is effected into a launder at a point 9 inches above the highest point of the jacket, doing away with any chance of steam gathering in it. The launder can thus be made a fixture, and does not require to be moved when a jacket has to be taken out of a furnace, as in the old style of furnace. All the water from the top and bottom jackets, tuyeres, breasts, separators, and slag spouts delivers into the launder which sur- rounds the furnace, and this in its turn empties the water into the hollow columns which support the top jackets. From these columns pipes underground carry the water to cooling tanks, from whence it is pumped back to the supply tank for use again. Each of the lower jackets have three lugs for bolts on each outside perpendicular edge, and, in addition to bolting the whole of them together, a binder of 60 lb. steel rails goes around them to stiffen the structure. The crucible on which these jackets stand consists of a large pan made of 3-inch wrought-iron plate, in which brick is laid with fire- clay to form a basin or well to collect the lead reduced from the ore. The lead is drawn off from this well by a passage in the brickwork, starting at the bottom of the well and passing up and outwards at an angle. This system has been incorrectly styled a ‘siphon tap,” or the ‘‘ Arent’s siphon” after the first user of it, but it is plain that it is not a siphon, the lead simply rising in the passage and obeying the law of all liquids in finding its level. The Matthewson matte separator is an ingenious arrangement, which takes advantage of the presence of the blast in the furnace 286 PROCEEDINGS OF SECTION B. to have the slag forced to deliver at a higher level outside the furnace than it lies inside. It is satisfactory only when small quantities of matte are being produced. The brick-shaft furnace requires no description other than that the brick shaft is supported on a heavy cast-iron entablature supported on cast-iron columns. The all water-jacketed furnace just described measured 50 inches wide and 132 inches long at the lower jackets, 34 inches wide between the noses of the tuyeres. It was nearly 17 feet deep from the feed-plate to the bottom of the crucible. Since these furnaces have been built, much larger furnaces on the same design have been erected at other works, and have given the greatest satisfaction ; in fact, it may be safely said that the days of the brick furnace are over in all newly erected smelting plants. The “ blowing-in” operation, or starting of one of the blast furnaces, requires experience, and a sharp eye kept on all that is going on. At the risk of being prolix, I will describe the actual operation of starting a lead-blast furnace. From two to four days before the real start is made, a drying warming fire is lighted in the brick crucible. The water-pump is started, and water turned on to all the cast-iron and wrought-steel jackets, tuyeres, and separator breasts. Usually there is a separator at both ends of a large furnace, and when the fire is lighted, one of these separators, breast and slag spout, is taken out of the furnace to leave an opening through which the wood is passed into the crucible. As soon as the bricks of the crucible begin to warm up, the engine driving the blower is started (or in a nest of furnaces the blast is let into the ‘“ bustle-pipe ” from the main blast or air-pipe), and the fire is urged by the wind thus forced into the furnace. Care is taken that a plentiful supply of water is kept in all the parts of the furnace that would otherwise get heated. The 15 tons of lead requisite to fill the crucible is now melted in with the aid of the wood fire (urged by the blast from the blower) in lots of twenty-five to fifty bars at a time. This usually takes eight or twelve hours, and it is not advisable, though quite possible, to take less time, inasmuch as the lead would not retain sufficient heat to keep it molten for the few hours required, after the furnace is closed up or started, before the furnace begins itself to produce lead from the ore. Imme- diately all the bars of lead are thoroughly melted in, the whole of the hot ashes and coals from the wood are then skimmed off the lead, leaving it almost quite clean. ‘Too much time must not be wasted over this operation, for the molten lead in the crucible is cooling while exposed to the air. It is also very necessary to get these ashes out, because if left in the furnace they form what is called a “crust” over the well or crucible, which acts as a shield, and prevents the lead reduced in the smelting operation from METALLURGICAL METHODS AT BROKEN HILL. 287 getting into the crucible, so allowing the lead of the well to chill from want of fresh supplies of heated lead, most probably causing a “shut down” of the furnace. As soon as the ashes are all out, some deal, or any easily ignited wood, is thrown on the face of the molten lead, which last should be hot enough to ignite the chips in a few moments. The corners of the furnace are well supplied also to make sure of a good fire all over the crucible. The heavier wood is then thrown in, and the mason then puts back the separator, breast and slag spout, having all necessary bricks cut the exact size required beforehand, so that the least possible time may be consumed from this time on until the blast is put on the furnace. Immediately the mason has secured the separator and its parts in place, more wood is dropped into the furnace from the top floor, through the feed opening, until the tuyeres are just covered with wood. If the flames have not obtained a good hold of the wood you must wait a little. As soon as you are satisfied that the fire has a good enough hold of the wood, some 1,600 pounds of coke is emptied into the furnace out of bags, which have all been weighed up in readiness. Then the following charges are shovelled into the furnace as rapidly as the eight or nine men on the furnace can do it. I might say that the first 50 of the charges given below are weighed up and stacked on the floor around the feed-opening of the furnace, each charge being divided off from the next with a piece of wood. This weighing-up is done to facilitate the filling-up of the furnace when every moment is precious. BLOWING-IN CHARGES. 25 charges of Slag oe a dirs soe, 600. Lb: ) Manganic ironstone... bao MOG gel oe SOR) LD, Limestone : ort ae TN zs Coke... ae Se eae, heel cas 25 charges of Slag bes i 3: woo DOO-Thi, ) Carb. lead ore ... ae cian in Ong L995 ib Limestone oi oe dest TO syle Manganic iron ... ses haa yon CMD eh til Woke: \ ke. =e os: get: hon pe 50 charges of Lead ore (carbonate) ... Jae) da Dulaee) Silicious iron... ane ew ULOOe,, eal Manganic iron ... te i i paheI eee De es Limestone ae oo ee 2U0R,, eek Slag’) Js. Se shea deo 5,1) Coke... ee ae seh 2. - Then regular charges Je see lea 1,000 I). 288 PROCEEDINGS OF SECTION B. After the first 15 charges have been put in, 10 bars of lead are dropped into the furnace; after the next 15 charges, 10 bars more ; after the next 25 charges come 10 bars of lead ; and for, say, 90 charges afterwards, 1 bar of lead is fed in with each’ charge. This is done to get a lot of lead into the crucible quickly, for this additional lead, being heated to bright redness in its descent in the furnace, accordingly raises the temperature of the lead in the well or crucible, and stops the risk of the lead “freezing up” which we first saw melted in. While the men are filling up the furnace, you see that the tuyeres are all closed on the furnace, so taat no gases from the wood can get into the main blast-pipe and cause damage by exploding ; “that all the jackets are keeping cool and the ‘‘siphon” from the lead well to the outside of the furnace is not choked up and has a bright fire on it. In fact, give a look around to see that nothing is missing or wrong, so that the blast may be turned on the instant the furnace is filled up. With the - wood and coke which were first put in, 40 of the blowing-in charges fill the furnace to within 6 feet of the feed floor. Then, sending all the slag men down to their proper stations, the blast is turned on at a pressure of about 3 to 4 oz. to the square inch. In a very few minutes every joint between the water-jackets is smoking, if they have not been well rammed with fire-clay. Wet clay is placed on the smoky places to check it, because after a while these streams of smoke catch fire, and sometimes burn the windbags ; and, if they do not, the smoke from wood is not the most pleasant substance to get into one’s eyes. About twenty minutes after the blast has been turned on, the smoke all ceases, through the furnace beginning to smelt the charges which have just been put in; the first slag formed chilling on the jacket and closing the cracks. Then the tuyeres are examined frequently to judge how the slag is forming. In an hour and a quarter to one and one-half hours after the blast goes on, the first slag can be tapped from the furnace. The slags first produced by the furnace are purposely made lower in silica than those produced when in regular work; for, being low in silica, the newly blown-in furnace will be able to melt» them easily and quickly, and so get a good start. As a rule the first slag contains about 30 per cent. of silica. When the last of the 100 blowing-in charges are in the furnace the regular charge is put on. The following charges, with slags from same, together with the dip, sample assays, and mattes made, will give some idea of the usual composition of the smelting char ges when in regular work. The last eight are selected because sulphide of lead was used in large quantities and no carbonate of lead ore. METALLURGICAL METHODS AT BROKEN HILL. Samples of Charges on Furnaces in lb. Nos. 1 to 8. Carb. | Flue ___ |Silicious | Crude Tron- | Lime- No. Lead Ore.} Dust. Kaolin. ae phide Iron Ore stone. | stone. Coke. 1 150 300 | 150 | 25 ‘ 75 890 125 2 150 175 225 | 25 ah 125 390 125 3? 150 275 lia) | 25 aos 75 300 125 4 150 250 200 | 25 459 50 300 125 5 150 aoe Papa) 200 | 25 25 is 300 125 6 | 125 | 25 | 300 | 150 | 25 |195 | ... | 250 | 195 7 150 Aan 250 lyf; 25 125 Has 275 125 8 175 250 100 | 43) 175 275 125 Leaving the coke out, these figures add to 1,000 lb. in each case ; the weight and charge is always kept. No. Pb. vA 1 2°25 2 4:00 3 Da) 4 2°75 5 2:25 6 1:50 a 4:5 8 4:25 9 15 10 S305: 11 3°25 12 My) 13 3:0 14 6:5 15 15) 16 125 No. | Kaolin. 9 125 10 125 il 100 12 125 13 125 14 125 15 125 16 100 T Slag analysis on morning following. SOHCOHPHP OHNE NH WHE PORDONOROAS~ IFA BBD Silicious Tron. si oO, Fe. %. Mn. %. 42°0 12°7 12°8 36°8 10:2 14°0 45:2 9°4 70 46°8 LOS, 6:2 39°6 140 8:0 40°8 9°6 10°0 38:0 10°0 11°0 39°4 105 10°8 34°5 15:2 7°83 28°5 19°5 7:0 34°8 15°4 78 34°0 14:0 79 31°6 20°8 7:0 29°6 23°4 6:0 S20 15:0 82 34°2 16°4 (ol Ore Charges, 9 to 16. Crude Tron Tron- Lime- Sulphide.| Ore. stone. stone. 325 150 225 325 He 250 175 aoe 50 abe 225 Somos, ||, -1a0 225 ae | 250 175 325 | 250 175 325 150 275 ae 100 225 Ca.0 % sere eee Seeeee veenee Sulph. Concen. VANES CC: Sa COU Ou Oem 2) 8 shel isl t=) ie PS Crore eyes Se 2 Pc | | Slag. 100 100 100 100 100 100 100 100 Dip Assay, Silver oz. 586 340 520 436 484 220 Coke. 290 PROCEEDINGS OF SECTION B. First Matte from Charges. No. | 9 | 10 | 11 | 12 13 | 14 | 15 | 16 Lend Bee 36°8 | 25°5 42:0 | 29:2 | 58:4 | 35:4 | 23-7 Copper % vse 42| 4:4 42| 62| 32| 40] 4:4 Silver, 0Z. voce 42-0 | 29-0 41:0 | 52°0 | 35:8 | 33:0] 31°0 Sample Assays of other Mattes. WC RLy senior ssenctiaeeeas 39°7 33°7 31°3 32°8 34°4 43°2 Coppers wa-eaanemcones 29°6 25:3 27:3 29-2 28°4 22°0 Silivieny Ozone trae 195:00 | 244:00 | 138:00 | 163-00 | 172-00 | 182-00 Third Matte Assays. RAL stir wert ave ar a'efon:crveltearnewrtenesee 29°8 32°9 37°9 371 COpperigieiscatieasserevosssbesecions 40°0 42:2 Bs 32°7 Silver MBE. coshachatacucemeecrkoas 32600 361°00 179°00 261:00 The ironstone shown in these tables is distinct from the iron ore, the latter being the produce of the mine, analyses of which are given under the head of manganic iron ore, whilst the former was purchased at a cost of about 21s. a ton. It assayed from 6 to 14 per cent. silica and 50 to 60 per cent. of Fe. The limestone came from Tarrawingee, and assayed from 6 to 11 per cent. silica, 1 to 5 per cent. of carbonate of magnesia, 14 per cent. ferric oxide iron, the balance being carbonate of lime. It cost 14s. a ton landed on the mine. Regarded as a smelting ore, the Proprietary ore was decidedly a nice one. Its composition, wherever the ore came from, was such a happy blending of bases and silica that it smelted very easily indeed, and had some means been provided by which the ore could have been regulated in its fluxing value as it went to the furnaces, as well as its silver and lead value, the mischief caused by irregular qualities of ore would, of course, have ceased, and allowed of clean smelting there as elsewhere. The presence of manganese binoxide in the ore was also of the greatest assistance both as an oxidiser for the sulphur and for its rapid melting qualities. The zinc was never present in the slags in sufficient quantity to cause any mischief. Alumina was the greatest nuisance ; and my experience has been that with slags up to about 36 per cent. in silica the alumina acted as a base ; but usually as soon as this point was overstepped, the slags immedi- ately thickened up and assumed a most silicious appearance, due, METALLURGICAL METHODS AT BROKEN HILL. 291 in my opinion, to the alumina changing its functions from that of a base toan acid. It has been experienced so often on different ores as to leave no doubt in my mind that its action is as stated. After a furnace has been at work for a day or two all trouble arising from the ‘‘ blowing-in” operation is gone if care has been exercised. The “ blowing-in” crust is some trouble if allowed to form ; but as a rule it is great want of attention that allows this to make. It is due to the ashes of the wood which was thrown in at first to ignite the coke, forming into a solid mass, through the first slag formed chilling in it. The mischief of it is that it prevents the lead reduced or added to the “blowing-in” charges from getting into the well, and unless holes can be driven through it into the lead underneath, the latter will most assuredly chill and cause endless trouble, worry, and expense. When the furnace has been running slag for about an hour, the ashes inside can be broken up by introducing an inch round bar through either tap- hole and running it well into the furnace in all directions with the aid of seven or eight men. The ashes then float out with the slag, and if this is done fairly often for the first hour or two all danger of a “blowing-in” crust is avoided. The blast pressure is gradually risen to the point settled on, 10 to 15 cz. usually, and the temperature of the lead in the well soon increases until at the end of twenty-four hours it is usually bright-red. With good ore and plenty of water free from lime or magnesia, the furnace should have a long and successful run. The largest output of lead that I know of from one furnace for twenty-four hours was 26 tons ; 166 tons of charge being smelted to produce this. The ore smelted consisted of carbonate of lead averaging about 35 per cent. to 45 per cent., and was, of course, the easiest smelting ore to be had. This happened at the British Mine when I had charge of the furnaces. The week’s output of lead at the same time was 167 tons. Carbonate lead ore is no longer found in any large quantities, and it is now carefully hoarded, so that if a furnace produces from 5 to 7 tons of lead a day it is quite equal to the average output. COST OF SMELTING. This varies from half-year to half-year; but, on the whole, has has steadily decreased, until at present it costs about 25s. a ton, including costs for superintendence, labour, repairs, water, fluxes, fuel, light, &c. In 1888 the cost of smelting amounted to 36s. 5d. per ton, with the pick of the ore to smelt. The costs given do not, of course, cover desilverisation expenses, insurance, carriage on bullion, &c., but are simply the actual expenses incurred on a ton of ore in the blast furnace department from the time the ore is received from the mine until the bullion is made and put in the railway trucks ready to be despatched for further treatment. 292 PROCEEDINGS OF SECTION B. The lowest smelting cost per ton of ore was, I think, done at the British furnaces, on Proprietary ore, from the 1st of June, 1894, to the 13th September, 1894. The quantities of ore smelted were as follows :— Carb. lead ore a i ... 4,358 tons net. Silicious iron and kaolin... poe oOo oD ‘5 Manganic iron ore ... ee moe 219 be Sulphide ore... na =a wal 53 93 26,085 net tons. Coke used, 3,801 tons, or 14:57 per cent. on the ore ; limestone used, 2,452 tons; coal used, 59 tons ; firewood, equal to coal tons, 774 tons. The total cost of everything, including rent, water, coke, flux, coal, firewood, repairs, stores, light, salaries, assay expenses, and labour about the furnaces, was £24,214 Is. 11d. or 18s. 63d. a ton on the net ore. Manganic iron ore was good and plentiful, and, therefore, no ironstone had to be purchased, which, of course, materially helped toward the low cost of smelting. This year will probably see the last smelting done in Broken Hill, the Proprietary Company finding it to their advantage to carry their ores to Port Pirie where coal, coke, and fluxes are cheaper than at Broken Hill, and also of better quality. Low rates of freight offered by the South Australian Government have been one of the inducements, and with cheap and good concentra- tion of the sulphide ores, it costs less railage per unit of lead when in rich concentrates to send to Port Pirie than if it was first made into bullion. This is no inconsiderable item. he advantage of concentrating the smelting operations and lead-refining under one Superintendent will also be gained, for hitherto the Company had six furnaces at Port Pirie in addition to those at Broken Hill, necessitating a separate staff in each place. SMELTING LOSSES. In the absence of any reliable method of sampling the ore, the exact contents were never really known. ‘Grab samples” were the only means used to arrive at its value, taken from each mine truck as it reached the surface, and at the furnaces a man was kept on each shift to sample the ore.as it was smelted. It was the crudest method of sampling possible, and naturally the results were just as crude and useless. Had accurate means of sampling obtained, it would have been a great check on the furnaces and given the General Manager a lever which ‘he never possessed on the whole metallurgical department. Certainly it would have saved many thousands of pounds yearly. Accurate accounts were METALLURGICAL METHODS AT BROKEN HILL. 293 made out on the basis of the assays which were obtained from the samples, every little item being brought into account each week to the last fraction of a penny, to get at the cost per ton of ore treated. These latter were correct enough, but the statement of the recovery of the silver and lead was not worth the paper it was written on, inasmuch as the basis of the whole thing, the assay of the ore, was the result of incorrect sampling. The samples were just as likely to show a greater value in the ore than it contained, or vice versa. Hence you would see that for one week the total extraction of lead was 70 per cent., silver, 120 per cent. The next week the figures would show a recovery of, lead, 47 per cent., silver, 65 per cent. These discrepancies can only be attributed to the incorrect method of sampling. Apparently more silver was re- covered in the first instance than was in the ore, showing immedi- ately the valuelessness of the whole return. Sero2 200 es AUG Oe: O1d= MnO, Ons, sie, ted aaah Lae eis ZnO P20 * a ete ae oO nee Trace of Antimony. 99-762 99-894 From the cooling floors the chloridised ore is hauled to the lixiviating works and there dropped into leaching vats, of which there are 12, arranged in two rows, with footways between them and tramways over them. Each vat is circular, made of 3-inch thick timbers, the bottom timbers being tongued and grooved and the sides simply butt joints, the whole stayed with wrought-iron straps passing around the vats. The diameter is 16 feet and the depth 7 feet, and with a 5-inch false or filter bottom, made of rough cobble stones about 4-inch ring size, covered with a layer of straw. The vats are filled up within about 12 to 15 inches of the top, and hold about 49 to 50 tons of the roasted ore. The vat of ore is first washed with hot water at the rate of 16 inches an hour for one and a half to two hours. This dissolves out a very considerable quantity of the lead chloride and salt in the ore. The wash-water runs into depositing pits outside the building, where the metallic contents are precipitated by scrap-iron, the after liquor running to waste. After washing, a 1 per cent. solution of sodium hyposulphite is run on the ore, and of a temperature as nearly as possible about 100° Fahrenheit. The speed of the leaching is from 4 to 6 inches per hour, and it usually takes forty to fifty hours to finish a vat. Ten hours after the leaching liquor is put on; 360 tb. of carbonate of soda are put on to the top of the ore under the stream of hypo- sulphite of soda, which dissolves it up. This is added for the reason that the lead chloride not extracted by the first wash-water attacks the solution of hyposulphite of sodium, decomposing por- tions of it, and forming lead hyposulphite. If carbonate of soda is added to the hyposolution, it, in turn, decomposes the lead hyposulphite and forms carbonate of lead, and regenerates the METALLURGICAL METHODS AT BROKEN HILL, 299 hyposulpite of soda before destroyed. Lead carbonate being in- soluble in hyposolution is not again attacked. It was found that about ten hours after the hyposulphite solution was run on the ore was the best time to put in the carbonate of soda. Some experimenting took place to determine the proper hour, and it was found that the best silver extraction results were obtained if this rule was maintained. The solution of hyposulphite of soda, with silver and lead in it, is conducted into one of a series of circular precipitating vats, each 10 feet diameter and 9 feet deep. When the vat is full, the lead in solution is precipitated by a saturated solution of carbonate of soda, using phenol for the alkaline reaction, which is taken asa sign that the lead is all precipitated. Some silver goes down with the lead, so that the precipitated carbonate of lead usually assayed about 70 oz. of silver per ton. The liquor, with the precipitate in suspension, was blown with compressed air for twenty minutes or thereabouts, the precipitate settling very rapidly afterwards. When the supernatant liquor was quite clear, it was drawn off into one of a series of six vats of the same size as the lead pre- cipitating vats. Here the silver was precipitated out by sulphide of sodium, and on settling, the clear liquid was run through a sand filter and elevated back to the hyposulphite tanks in the top of the building ready for use again on fresh vats of ore. The sludge of carbonate of lead was run into two storage vats, each 10 feet x 7 feet, and from these was sucked into a boiler-iron pressure-tank with a vacuum created by a steam ejector. When the tank was full the suction tube was closed, the steam ejector stopped, and a tap opened, which admitted compressed air, so forcing the semi-liquid sludge into a Johnson filter-press at a pressure of 60 fb. to the square inch. The liquor from this press was returned to the silver precipitating vats, and there treated, The dry cakes of carbonate of lead, obtained from the filter press, were sent to the blast furnaces for further treatment. The silver sulphide was filter-pressed in similar manner from storage tanks, 7 feet 9 inches diameter by 5 feet 9 inches deep, and the dry cakes roasted and melted with poor lead to make a rich bullion. The roasted ore handled was equal to about 1,000 or 1,100 tons weekly, and the average apparent extraction of silver was about 79 per cent.; the real extraction, after taking into consideration the 63 per cent. solubility of the ore, was 80} per cent. The roasted ore treated averaged between 12 to 14 oz. per ton of raw ore. The total cost of leaching, counted on the raw ore originally crushed at the chloridising plant, amounted to about 6s. 9d. per ton for all costs, including chemicals, labour, super- intendence, water, light, stores, repairs, renewals, coal, scrap- iron, &c. The water consumed cost about 4s. per 1,000 gallons ; 300 PROCEEDINGS OF SECTION B. and, roughly, 100 gallons were used for each ton of ore roasted. The cost of chemicals made up 2s. 64d. per ton of the total cost. The sodium sulphide was prepared in the works, being made of two parts caustic soda and one of sulphur, boiled with steam to assist chemical union. The following represents approximately where the silver was recovered in the different operations performed in the leaching department :— In the sulphide precipitate ... 75°78 per cent. of the whole. 5) Sacarbonatesof lead = "15. 26-31. = 5, Wwash-water ... os LOAt =~, 5p » vat bottoms ... soe AS te i 100-00 The total men employed in the leaching works were as fojlows for each day of twenty-four hours :— 3 chemical mixers. 3 ore-vat men. 9 men at filter presses. 3 precipitating men, 3 shift bosses. 20 men removing leached ore. Total ee lemen: Salt cost 36s. 8d.aton; coal, 34s.; and wood, 14s. a ton. The plant cost, on completion, a little over £15,000. The Russell extra solution was used some years ago, but no apparent benefit was obtained by its use, and it has been discon- tinued since about 1893. Taking the hyposulphite process, as a whole, it has not been very successful, due to the character of the ore and the particular form the silver is found combined in. Usually the latter consists of native silver, iodides, and chloro- bromides. I do not think pure silver chloride exists in Broken Hill ores. Until the chloridising furnaces were built, the process had given rather disappointing results. Better results were obtained when these furnaces began to work; but then the percentage of lead began to rise in the available ores. The car- bonate of soda addition to the vat seems to have conquered all difficulties until fresh ones turn up. Of all the bye-products made from the leaching plant, that from the wash-water precipitate has been the most troublesome. As the hot wash-water cools, it deposits chloride of lead that is not wholly decomposed by the iron scraps, and, when the precipitate from the tanks is cleaned up and sent to the smelting plant, heavy losses in volatilised chloride of lead is experienced. The most METALLURGICAL METHODS AT BROKEN HILL. 301 satisfactory solution of the difficulty is adding oxide of lime to the solution and precipitating the lead and silver in that way as oxide ; the bye-product of chloride of calcium can be Jet go to waste. It is a matter of expense only, for the reactions are perfectly satis- factory. AMALGAMATION, This process was discontinued some twelve months ago. The extraction of silver was very satisfactory, but the specific gravity of the ore was high enough to always interfere with the separation of the mercury in the settling pans, and you would see masses of manganic iron slime that were full of mercury in the finest state of division—of course carrying silver—with which nothing could be done, economically, to extract the locked-up mercury. It soon resolved itself into a matter of the cost of mercury ; but, if an ore of about 20 to 22 oz. of silver had been obtained steadily for the amalgamation work, there was no doubt of its superiority to the leaching plant ; because the loss remained the same, whether on 14 oz. or on 20 oz. ore, a rule which did not act so well with the leaching. As the grade of ore necessary, low in lead, could not be obtained in large enough quantities to keep the whole of the plant going, it was stopped. Its capacity was about 1,000 tons weekly. There were 60 stamps erected, with a drop of 6 inches, weighing 850 lb. each, and 95 drops a minute. The remainder of the plant consisted of 24 grinding and 24 Howell amalgamating pans, each 4 feet 6 inches in diameter and 3 feet 4 inches deep— the first-named pans running 40 revolutions a minute, and the latter 75 to 80 revolutions. There were also 12 settling pans, running 14 revolutions a minute, each being 8 feet in diameter and 3 feet 6 inches deep, the whole of the pans being cast-iron. Towards the latter end of the operations it was found that blue- stone (sulphate of copper) was not necessary for the successful extraction of the silver in the amalgamating pans ; and it was not an uncommon thing to have the retorted bullion from this plant, after the use of the blue-stone stopped, running 996 to 999 fine in silver. CONCENTRATION. The first attempts at concentration were made on the low-grade carbonate ores. The evil day of sulphide treatment had not yet come. The ore sent to the concentration department was highly silicious, low in lead and silver ; and if the ore had been specially mined for the purpose of concentrating it, there is no necessity to hesitate over the fact that it was not a payable proposition. But, like the low-grade ores which are chloridised and leached, this ore had to be taken out, whatever use was made of it afterwards. The cost of mining it was borne by the smelting ore necessarily, and placing the matter on a common, ordinary, bookkeeping footing 302 PROCEEDINGS OF SECTION B. this low-grade stuff cost nothing delivered on the surface. Its value ran from 7 to 12 per cent. lead and from 6 to 14 oz. of silver; and the question was: Could this low-grade material be concentrated at a profit? Without further treatment the ore was worthless ; but the carbonate concentrate that was produced from the ore was infinitely preferable to use in the furnaces than the crude sulphide ores. Looked at in these days, when carbonate ore high in lead is getting to be worth more than the value of its metallic contents, there would be no hesitation as to what would be done with the low-grade ore ; but in those days, when lead ore in the carbonate form was plentiful, when the value of a ton of lead in Broken Hill was but 50 per cent. of its London market price, the wisdom of some of the immense concentration plants which were erected seems doubtful. Block 14, the British Com- pany, and the Proprietary, rushed into enormous expenditure ; whereas one only of the first concentration plants erected would have demonstrated for evermore their uselessness on the = of ore that had to be treated. The first system of concentration was with the Collom jig, and after, treatment to recover the rich slimes by a kind of Linkenbach table. The ore was first crushed with an enormous steam-eating stamp—the very worst system of crushing which could have been devised for this class of ore. Think, fora moment, of the compo- sition of the ore—a hard quartz and a friable carbonate of lead. Every blow of the stamp shattered the quartz into fragments— of that there could be no doubt; but it smashed the bulk of the carbonate of lead into slimes. The stamp was something like the whole plant —there was no economy in the structure of either, and when finished neither did the work expected of them. Both the stamp aad the jig were splendid appliances for dealing with ore like they have at Lake Superior, U.S.A., from whence they were imported, where the ores were copper, the latter existing almost, if not altogether, in the metallic form. No smashing blows could do any mischief on this class of material, and the large crushing capacity of the steam stamp was thus an advantage. Time went on, and the steam stamp was thrown out on the scrap heap, and a good many of the Collom jigs also. Alterations were made in their motions, notably at the British Mine, where the tappet motion of the plunger was altered and driven with an eccentric, so giving a more even pulsation in the jig. This improvement was a good one; and if the size of the jigs had been about three times greater, considerably better recovery would have been made ; for, after all, the Collom jig, as used in Broken Hill, was but a toy. As the carbonate ores began to disappear, the attention of the mine managers was impelled to the sulphide problem, of which volumes have been, and no doubt will yet be, written. METALLURGICAL METHODS AT BROKEN HILL. 303 The first attempt to concentrate the crude sulphide ores was, I believe, made at the British Mine, and it was an unqualified failure so far as the commercial side of the question was concerned. Constant trials were made at the Proprietary Mine with varying success ; but it is safe to say that until the Hancock jig was introduced at Block 14, all the efforts at profitable concentration of the low-grade sulphide ores were unmistakable failures. Lessons had been learned by the various companies regarding expenditures on concentration schemes, and they all waited until Block 14 had demonstrated that something could be done with this jig. Then the South Mine installed them, and then the British Company. The recovery of the first jigs did not amount to more than 48 to 54 per cent. of the lead ; but in spite of the low recovery the size of the jig allowed large quantities of ore to be rushed through them at the minimum of cost. As soon as it was found that some profit could be made out of the hitherto hopeless sulphide ore, even with such an extravagant loss of lead, more attention began to be paid to the re-treatment of material rejected from the last hutches. These were crushed finer and passed through a second jig, and the same process was gone through with the low-grade product of the hutches of this jig, passing it through a third jig ; so that with the addition of slime buddles something like 65 per cent. to 75 per cent. of the lead contents of the ore treated is now recovered from the crude ore. The crushing machinery adopted for the ore with these jigs is the ordinary jaw-crusher, on the old Cornish principle, with a set of Cornish rollers for finer pulverisation. A new jig which is bearing the test of work and competition against the Hancock jig is that known as the ‘‘ Warren and May’s Improved Double Plunger Jig.” These jigs are working on a large scale at the Block 10 Mine, Broken Hill, and have been adopted by the Junction Company. The Proprietary also decided to adopt them after most careful tests against the Hancock jig. The fol- lowing is a description of the Warren jig :— The ore is crushed to pass through a trommel, pierced with a rectangular slot 16 gauge wide and a bare quarter of an inch in length. From the trommel the crushed ore drops into the receiver with a perforated bottom, through which it passes into a Warren patent slime separator. This separator is a revolving basin or pan with an adjustable overflow in the centre. The water, with the slime in suspension, passes down the centre while the ore drops to the bottom of the pan and is wiped out by a volute-shaped plate, comparatively free from slime or water, over a lip, into the sleeves of the jigs. The plungers are connected by a rod with a rocker, the length of the stroke given to the plunger being regu- lated by a pin, which may be moved in or out along the slot in 304 PROCEEDINGS OF SECTION B. the rocker by a handwheel and screw. The rockers are actuated by a lever, which is connected by a rod to an adjustable pin in the disc, which is driven by a belt pulley. The belt wheel drives the shaft, on which is placed a small dise with an adjustable pin in it, to which is attached a rod. One end of this rod is connected with the lever which drives the tapping sbafts, and by the aid of a ratchet and pawl these shafts are made to rotate very slowly, lifting by the cam a rod at the bottom end of which is attached a pear-shaped valve or plug. This moticn allows the concentrates to pass out through an aperture and on to the proper receptacles for this product. By this means the interior compartments of the hutch are always kept clear ; the products of the first three com- partments are generally sufficiently high grade to sell, while those from the next two compartments are, by the aid of an elevator, returned to the machine again, the sixth compartment being the tailing receptacle. These are drawn off through a tap, with as little water as possible. The separator pans are driven with a pair of mitre wheels. The jigs are 22 feet long by 9 feet 3 inches wide and 4 feet 6 inches deep. The sides and ends are built of 3 inch Oregon, and the jigs stand on three trestles, made of 8 inch by 8 inch Oregon, of which two are 11 feet high, with a cast-iron girder on the top to carry the gear. STB Go ko THE RUSSELL PROCESS IN AUSTRALIA. oul! The crushed ore from the rockbreaker was dumped on to the drying floor, where it was spread, and the salt added to it. When dry the mixture was taken by trucks to a hopper, thence by an automatic feeder to the Wall rolls. These were used to crush to one-quarter inch size. The crushed ore fell into a revolving screen ; that passing through, forming 25 per cent. of the whole, was taken by a spiral conveyor to the fine-ore elevator; the coarse portion fell into a link-belt elevator, and thence went to the smooth rolls. These rolls were set up tight. The crushed ore fell into a second revolving screen. All which passed through went to the spiral conveyor, thence by the fine-ore elevator (thin buckets bolted to a rubber belt) to the roaster bins. That which did not pass through the screen formed only a small percentage of the whole, and was returned to the link-belt elevator, and so to the smooth rolls again. At the end of the conveyor trough, where the fine ore fell into the elevator, a small pipe sampler was fixed, which furnished a continuous stream of pulp. From the sample so obtained the results given later on were calculated. The screens were covered by brass-wire cloth containing 480 holes to the square inch. The Westinghouse engine furnished the power for the whole of this portion of the plant, and gave satisfaction. Owing to scarcity of ore, no effort was made to find the full capacity of the plant; but 15 tons per shift of eight hours were crushed with ease. Apparently the capacity of the two sets of rolls was much greater. The first screen had a screening surface of about 25 square feet, the second about twice as much. With perfectly dry ore, and so long as the rolls were doing good work, these screens gave no trouble; but it was evident that the second one would have been better if larger. The secret of successful crushing appears to be the perfect drying of the ore; in fact, the ore crushes and screens better if it is quite hot. The salt was added at the drying floor, and was simply spread over the top of the ore in measured quantities, and became mixed in passing onwards through the mill. At first, owing to Customs regu- lations, rock salt was used, which had, of course, to be passed through the rockbreaker. Subsequently, ordinary coarse salt was used. The mixed pulp was fed from the hoppers into the Howell roaster by a small spiral conveyor, driven from a pulley on the driving shaft of the roaster. The quantity was regulated by a sliding door on the hopper. The roaster was fired by wood at one end only. An auxiliary fireplace was tried, but proved unneces- sary, and the waste heat from the roaster was also found sufficient for the drying floor. The roaster was tried at many different speeds, but we found one revolution in one and a half minute gave the best results, and that the capacity of the furnace did not exceed 15 tons in twenty-four hours. 312 PROCEEDINGS OF SECTION B. The dust accumulating in the first large chamber was removed every night and added to the ore on the cooling floor. The dust from the drying floor flues was removed at greater intervals, and was leached in shallow charges by itself. If it were to be removed daily it could be sent to the vats mixed with the ordinary stuff on the cooling floors. The roasted ore was not allowed to remain long in the hot-ore hopper, but was quickly removed to the cooling floor, where it was left in a pile, about 3 feet high, until quite cool; this we found to take nearly a week. From the cooling floor the roasted ore was taken by a short tramway to Division III. III. The Leaching Mill. This comprised :— Three ore vats, 16 feet diameter, 7 feet deep. Three precipitating vats, 10 feet diameter, 9 feet deep. Two square tanks for wash-water precipitation. Two square tanks for storing precipitates. One square cement sump for solution. One No..5 gun-metal lined Blake pump. Two stock solution vats. Wrought-iron pressure tank. . Johnson’s filter press. 10. Cast-iron tank for making sodium sulphide. 11. Two wrought-iron tanks for storing sodium sulphide. See Ce OU Co Fresh water was supplied by gravitation from a dam above the mill. The steam boiler in the crushing mill furnished the steam required, but was too small for other requirements. Had the mill been run at its full capacity a separate boiler would have been necessary for the leaching mill. The vats were made from a local timber, known as beech or white cedar, and were constructed exactly as recommended by Stetefeldt. They were provided with ejectors for circulating extra solution, and were well tarred with coal tar, as were also the launders and all ironwork. The stock solution vats were fitted with cast-iron pipes for heating the solution by steam. These large vats must not be left empty for any hours or they begin to leak, however well made they may be. ‘The ore was charged into the vats dry, water being introduced from the bottom to saturate the charge while filling proceeded. ‘The tailings were sluiced out when there was sufficient water to spare for the purpose. The extra solution was made up on the charge. The solutions were stirred by hand with a long wooden rabble during precipita- tion. The precipitates settled rapidly, and were run off daily. The lead was not precipitated separately. When sutlcient preci- pitates had accumulated they were pressed in the filter press and dried. The pressure was produced by steam. E,Weruler Gargc. yso— : : € al »—e— > SPurcchmn Ghasrah SMuw Do Sec u fi . z 444+ ttt t+ : bwin n so {60- Hetesiess Grand. Ss Pinas ee Cang-3 7 eacier® - I Glacial Action—Bacchus Marsh, Victoria. By C. C. BRITTLEBANK, G. SWEET, and Prof. DAVID. GLACIAL ACTION—VICTORIA. 365 Speaking for themselves, Messrs. Sweet and Brittlebank regret that they have to take exception to some remarks made by Messrs. Officer and Balfour, at the Brisbane meeting of this association. In reply, they would point out that the statements made by them at the Adelaide meeting are true in substance and in fact ; this can, if necessary, be proved by correspondence which passed between Messrs. Officer and Brittlebank. Mr.C. Brittlebank would also direct attention to an apparent slip made by Messrs. Officer and Balfour. They state that Mr. Brittle- bank was the first to discover the true direction of ice-flow and interpretation of the Bald Hill sections. As Mr. G. Sweet was present on every occasion when these discoveries were made, Mr. Sweet’s name should be associated with that of Mr. Brittlebank in connection with these discoveries. No. 3—NOTES ON THE GEOLOGY AND MINERAL DEPOSITS OF PORTIONS OF WESTERN AUSTRALIA. By E. F. Prrrvan, A.R.S.M. (Read Monday, January 10, 1898. ) No. 4—THE EARLY HISTORY OF TIN. By 8. B. J. Sxerrcnty, B.Sc. No. 5.—THE PLEISTOCENE HISTORY OF NOTHERN ASIA. By 8. B. J. Sxerrcuty, B.Sc. No. 6.—THE BDELLIUM OF SCRIPTURE. By 8. B. J. Sxertcuty, B.Sc. (Read Monday, January 10, 1898. ) 366 PROCEEDINGS OF SECTION C. ! No. 7.—THE ARTESIAN WATER-BEARING BEDS OF NEW SOUTH WALES. By Tue Rev. J. Mitne Curran, F.R.G.S., (Read Tuesday, January 11, 1898. ) No. 8—NOTES ON BONDI DYKE AND PRISMATIC SANDSTONE. By BR. ti Jack, H.G.S., EIR.Gs: (Read Tuesday, January 11, 1898.) No. 9.—NOTES ON THE PHYSIOLOGY OF THE PARISH OF ST. GEORGE, N.S.W. By E. J. SraTHam. (Read Tuesday, January 11, 1898. ) No. 10.—NOTES OF A GEOGRAPHICAL RECONNAIS- SANCE ON THE MOUNT KOSCIUSKO PLATEAU. By Tue Rev. J. Mizne Curran, F.R.G.S. (Read Tuesday, January 11, 1898.) GEOLOGY OF MOUNT KOSCIUSKO. 367 No 11.— CONTRIBUTIONS TO THE GEOLOGY OF MOUNT KOSCIUSKO AND THE INDI-MONARO TRACK, NEW SOUTH WALES. By A. E. Kitson, F.G.8., and W. THorn. (Read Tuesday, January 11, 1898.) [ Abstract. | Tue following remarks embody a few observations made in the Kosciusko region, and the accompanying notes on the microscopical examination of typical rocks have been kindly supplied by Mr. A. W. Howitt, F.G.8., &., to whom we desire to express our great indebtedness. Several writers have referred* to the prevailing rocks on Mount Kosciusko as granites of various kinds. As pointed out previously by one of us,f the rocks at Monaro Gap are grey gneissic granite. With local variations, the granite of the Kosciusko Plateau,fwith its high parallel ridges, peaks, and tors, is of much the same character, though aplites of various kinds occur in several parts. The main plateau has an elevation of about 6,800 feet above sea level, and the ridges and peaks are from 100 to 250 feet higher. The tors are separated from one another by low, grassy saddles ; and, in their great pillars and blocks, traversed by vertical and horizontal joints, furnish excellent illustrations of weathering. Echo Point, so named by us on account of the splendid echo there obtainable, is composed of a pretty, reddish aplite, and has a fine example of a rocking-stone. A saddle, 7,000 feet high, joining Mount Etheridge to Mount Kosciusko, the highest peak, divides the waters of the Snowy River, flowing north, from those of the Leatherbarrel Creek, running south into the Indi River. On the southern side of this saddle, under the eastern slope of Mount Kosciusko, and in a valley of the same name, lies a beautiful tarn, which we have named Lake Kosciusko. The mount itself consists largely of foliated granite, especially on its eastern side above the lake, where the rocks have high angles of dip and a northerly strike. Frost action is everywhere noticeable in the numerous massive blocks showing extensive fractures. * “General Geology and Physical Aspect of New South Wales and Van Diemen’s Land,” by Count Strzelecki. ‘* Researches in the Southern Gold-fields of New South Wales,” p. 125, by Rey. W. B. Clarke, M.A., F.G.S. | ‘‘ Report by R. von Lendenfeld on the results of his recent examination of the central part of the Australian Alps,’ Sydney, Government Printer, 1885. ‘‘ The Glacial Period in Australasia,” by R. von Lendenfeld ; Proceedings of the Linnzan Society of New South Wales, vol. x, Part I. ‘‘On the recently observed evidences of an extensive glacier action at Mount Kosciusko Plateau,” by R. Helms; Pro. Linn. Soc. of N.S.W., 1893, vol. viii. ‘‘ Geological Notes upon a Trip to Mount Kosciusko, New South Wales,” by J. B. Jaquet, A.R.S.M., F.G.S.; Records of the Geological Survey of New South Wales, vol. v, Part III, 1897. ‘‘ On the evidence (so-called) of glacial action on Mount Kosciusko Plateau,” by Rev. J. Milne Curran ; Proceedings of the Linnean Society of New South Wales, 1897, Part IV. t ‘Geological Notes on the Gehi and Indi Rivers and Monaro Track, Mount Kosciusko, New South Wales,” Proceedings of the Royal Society of Victoria, vol. ix, new series. 368 PROCEEDINGS OF SECTION ©. Though the prevailing rocks are of granitic nature, the original sedimentary, but now altered, rocks are observable outcropping in several places. For instance, along the whole length of Kosciusko Valley they have been changed into highly siliceous and felspathic mica-schists, quartz-schists, micaceous hornfels and quartzites. They are much contorted, and some of them have veins and reefs of the white, vitreous and opaque quartz, so char- acteristic of schist areas. At the source of the Snowy River a large outcrop of very fissile, siliceous slates and quartz-schist occurs, and lower down the gorge these rocks are greatly contorted and splintered by dynamic agency. At various points in the bed: of the Leatherbarrel Creek, in Kosciusko Valley, rocks of a similar nature may be seen, all dipping to the east, with angles varying from 54 degrees to 85 degrees. They are greatly jointed and in places overlain by large transported granite boulders. On the lip of the gorge, near where this creek plunges into the wooded valleys below, are several outcrops of highly-altered siliceous slates, siliceous and felspathic mica-schist, quartz-schist, fine-grained gneiss, and fairly massive quartzites. The last contain a large quartz reef, 3 to 6 feet thick, having the same general northerly strike as the strata which dip to the east, and east 20 degrees south, at angles varying from 73 degrees to 84 degrees. © The rocks in Kosciusko Valley are apparently connected with those at the Leatherbarrel ford by an intermediate series such as is found between the ford and Monaro Gap, and which probably exists higher up the Leatherbarrel Valley, thus forming a gradual transition from foliated granite through quartz-schist and indurated spotted slates to the phyllites and soft, fissile, argillaceous slates near the Leatherbarrel ford. The resemblance between the rocks at the ford and some of those in Kosciusko Valley appears at first sight very striking, but close examination shows the latter to be more highly altered, and the fissility of the original slates to have almost completely disappeared. The quartz, again, in the two areas differs only in the fact that in the former it possesses thin jaminz of argillaceous slate, while in the latter the corresponding laminz consist of greenish mica, probably chlorite. In some cases the original sandstones have completely lost their clastic character, and have reached a more advanced stage of metamorphism than quartzites ; in other cases they are slightly spotted and micaceous. The altered olive-green argillaceous slates are less decided in colour, and much more indurated, but otherwise resemble the typical olive- green phyllites of the Leatherbarrel Ford and the ‘‘Gehi Wall.” As already pointed out,* numerous dykes intersect this area, and these Mr. Howitt has determined as andesites and quartz—horn- blende—and quartz—mica-diorites. Mr. Howitt’s examination, * “ Geological Notes on the Gehi and Indi Rivers,” &c. GEOLOGY OF MOUNT KOSCIUSKO. 369 which reveals signs of crushing in several of the rocks, shows clearly that the Kosciusko rock masses have been subjected to great earth stresses. Generally speaking, it seems that the oldest rocks were sedimentary ones of probably Ordovician age. These were intruded upon by granites of various kinds, which built up the major portion of the plateau. Subsequently numerous dykes of acidic and basic rocks, such as aplites, andesites, and diorites, were injected, and the greater part subjected to dynamic metamorphism, followed probably by later series of dykes. Thus the metamor- phism has been of two kinds—contact and dynamic—the former altering the original sediments into quartzites, lydianites, por- cellanites, &c., and the latter carrying the alteration further, and transmuting these into micaceous hornfels, quartz-schists, mica— and felspathic mica-schists, and perhaps gneiss, and the intrusive granite into gneissic granite and gneiss. The metamorphism, therefore, appears to have been similar to that which produced the interesting rocks found in certain portions of the Omeo and Dargo districts in Victoria, and described* by Mr. Howitt. The question of glaciation has evidently been the most potent factor in stimulating geological research in this region. Several writers are of opinion that evidences of such action exist. Unfor- tunately, we were unable to examine any of the localities and deposits described by them, as our observations did not extend so far northwards, so can express no opinion regarding their main con- clusions. In many places in the valleys we observed large masses of granite with polished surfaces, which at first sight appeared to be of glacial origin, but proved to be simply weathered joint and fracture planes. In other places, however, evidence of another. nature seems to indicate ice action. On the south-western slope of Mount Etheridge lie numerous large and small pieces of altered sedimentary rocks, and masses of red and grey aplite, and granite. Many of the indurated and highly altered rocks are more or less smoothed, polished, and widely grooved. They are of both fine and coarse texture, and the latter only are devoid of joint planes which are quite different from the smoothed faces. On its western slope, and also lower down on the floor of Kosciusko Valley are great numbers of worn stones almost exclusively of altered sedimentary origin. *“ Notes on the Physical Geography and Geology of North Gippsland,” Quarterly Journal of the Geological Society, vol. xxxv. ‘‘The Diorites and Granites of Swift’s Creek,” Transactions of the Royal Society of Victoria, vol. xvi. ‘‘The Rocks of Noyang,” Trans- actions of the Royal Society of Victoria, vol. xx. ‘‘The Sedimentary, Metamorphic and Igneous Rocks of Ensay,” Transactions of the Royal Society of Victoria, vol. xxii. ‘‘ Notes on the area of Intrusive Rocks at Dargo,” Transactions of the Royal Society of Victoria, vol. xxiii. ‘‘ Notes on certain Metamorphic and Plutonic Rocks at Omeo,” Transactions of the Royal Society of Victoria, vol. xxiv, Part ii. ‘‘ Notes on certain Plutonic and Metamorphic Rocks at Omeo, ’Mining Department Quarterly Report, March, 1890. ‘‘ Notes on the Rocks occurring between the Limestone River and Mount Leinster,’ Mining Department Quarterly Report, September, 1890. ‘‘ Notes on the Contact of the Meta- morphic and Sedimentary Formations at the Upper Dargo River,” Mining Department Special Report, 1892. ‘‘ Notes on the Metamorphic Rocks of the Omeo District,” Report of the Australasian A. A. Science, Sydney, 1888. ‘‘ Notes on the Metamorphic Rocks of Omeo,” Report of the Australasian A. A. Science, Melbourne, 1890. Wy IN 370 PROCEEDINGS OF SECTION C. An interesting feature about these rocks is the occurrence on many of the harder and denser ones of a coating of what appears to be secondary silica which imparts a distinct glaze to them. Again, much of the material in the banks of the Leatherbarrel Creek, lower down Kosciusko Valley, consists of angular and sub- angular fragments of altered rocks, with large slabs of the same intermixed, and appears to have been conveyed thither by other than ordinary fluviatile agency. On the other hand, there is an entire absence of any deposits which might be regarded as lateral moraines ; neither did we see any satisfactory evidence of any roches moutonnées, perched blocks, boulder clay, or morainic débris. The probable auriferous character of the region may be briefly alluded to. As it possesses features so closely resembling those of proved auriferous districts where both plutonic and metamorphic action have taken place, it is very likely that auriferous reefs will eventually be found near and at the contact of intrusive masses and dykes with the sediments, and also in both these and the plutonic rocks themselves. The district on the western fall from Mount Kosciusko, embracing the upper portions of the basins of the Gehi River and Snowy, Gehi, and Leatherbarrel Creeks as well as the Snowy and Kosciusko Valleys, is-especially worthy of attention. These observations were made during two visits to the mount, but each time adverse weather militated greatly against continuous or connected work being done. Nore.—Since writing the ‘above, we notice that in a postscript to a paper (Proc. Linn. Soc., N.S.W., 1897, Part IV) on the so-called glaciation on Mount Kosciusko, the Rev. J. Milne Curran has evidently assumed that the original of this abstract dealt specially with that question. He is under a misapprehensien, as only a small portion of it bore on glaciation, and the opinions held by us are herein concisely expressed. No. 12.—NOTES ON SAMPLES OF ROCKS COLLECTED BY Mr. A. E. KITSON anp Mr. W. THORN. By A. W. Howirt, F.G.S. (Read Tuesday, January 11, 1898.) Tun slices have been prepared of a certain number of the rocks collected, and the following notes are the result of an examination of them under the microscope :— I. Metamorphic— (1) Phyllite and fine-grained Nodular Schist. II, Igneous— (2) Granitic-aplite. (3) Quartz Hornblende Diorite. (4) Andesite. —— AUSTRALASIAN Assoc, Aov. Sc. Vo. VII, 1898. PLATE XVII/8. GREY MARES s0c0NC up/spbur? spn \ Sy ZN yl’ S=RAM'S HEAD eh s a & ECHO POINT 00° the Indi MIP PINNIBAR #007 nite fall Sketch PLAN OF M” KOSCIUSKO DISTRICT SCALE_ 8 MILES TO 1 INCH. PLAN OF M? KOSCIUSKO PLATEAU SCALE _/00 CHAINS TO |! INCH Contributions to the Geology of Mt. Kosciusko, dc. (Note. — Heights approximate only.) By A. E. KITSON, F.G.8., and W. THORN. NOTES ON SAMPLES OF ROCKS. 371 I. METAMORPHIC. (1) Phyllite and fine-grained Nodular Schist. The Phyllites and fine-grained nodular schists appear to pass into each other, indeed to be merely different stages in the meta- morphism of fine-grained sedementary formations. 50. The former, as seen in this sample, is comprised almost wholly of mica flakes arranged in a linear manner, but scarcely forming foliations. They are extremely small, and are probably sericite. The only inclusions are minute black grains, which appear to be iron ore. 34. A further stage is shown where the rock is somewhat less fine-grained, the mica forming narrow foliations which include small “eyes” of radiating mica flakes. The rock is much permeated by black dust-like substance. Among the foliations are grains of quartz arranged in places in a linear manner, and all more or Jess drawn out in the direction of foliation, so that their sections suggest a lenticular form. 19. The composition of the nodular schist is mica, in. minute flakes and fibres (sericite), including much larger flakes of biotite, which is pleochroic in shades of yellowish brown. The biotite is arranged in lines indicating foliation of the rock. The only other constitutent of what may be spoken of as the ground-mass, are the plentiful grains of iron ore. In this mass are “spots” which, although micaceous, differ in so far from it that there is no trace of schistosity, and that the amount of biotite in them is comparatively small. The “spots” or “nodules” suggest, as was long ago pointed out by Professor Rosenbusch, that they represent portions of the rock substance which have been less completely metamorphosed.* 20. A further stage is where the rock-forming mica is of larger size, and the rock more decidedly schistose in structure. The alkali mica is in comparatively long flakes, and is colourless; the biotite is also longer, and is darker in colour, being pleochroic in shades of dark brown. In parts there are discontinuous foliations of grains of quartz and mica. The “spots” are also more marked, being composed of distinct flakes of alkali mica, but still almost free from biotite. 23. 25. Samples still more marked in their microscopic foliated structure. There are foliations of Muscovite mica and biotite or of these together with quartz. In places, however, the quartz is discontinuous, but always lengthened in the direction of foliation. The “eyes” in these samples are very quartzose, but as in the other samples are almost free from magnesia mica, * Die Steiger Schiefer. Strasbourg, 1877, p. 178 ef seg. Mikoskopische Physiographie der Massigen Gesteine, 1st part, 1895, p. 90. 372 PROCEEDINGS OF SECTION C. A peculiar and probably exceptional form of schist is where epidote takes part in the foliated structure ; the foliations being of mica, or of epidote and quartz with mica. In one part the slice is composed of somewhat larger crystals of epidote and quartz. II. IGNEOUS. (2) Granitic—A plite. 4], This rock is peculiar in so far that the felspar is orthoclase, microcline, microperthite, and more rarely a plagioclase. These crystals are hypidiomorphic and set in a ground mass of quartz in interlocking grains. The plagiolase may be oligoclase, but the observations as to extinction in the zone P.M. were not conclusive. The mica in this rock is in very small amount, in minute flakes, or aggregates of flakes, and is both muscovite and biotite. 43. In another sample the felspars as mostly microcline, more rarely orthoclase intergrown with albite veins, thus forming microperthite. The plagoclase is in hypidiomorphic crystals and obscures as under :— P. — + to P. and M. — M. 4° 40’ — 16° 40’ — 22° 58’ With convergent light the trace of the exit of an optic axis is visible about the plane T and of a bisectrix on M. These felspars appear, therefore, to be albite. A considerable amount of quartz and very little mica complete this sample. A series of samples illustrates the effects of crushing and of the production of a schistose structure in these aplites. 40. The felspars are of the kind already described, but in this sample are broken or somewhat rounded. The rock may be described as being composed of a ground mass of comminuted quartz and fragments of felspars. In this, which is the “ mortar struc- ture ” of some authors, are embedded the felspar crystals, all being more or less broken or rounded off. Mica has also been produced and forms small foliations in the slice. 31. In places metamorphism has produced regeneration of material, orthoclase crystals being bordered and enlarged by micropegmatite. 26. A further stage is the production of a decidedly schistose structure. The rock has been considerably altered so that the felspars are much micacised, but it may be described as alternations of felspar, probably orthoclase and quartz in irregular foliations. Irregular layers of dark-brown iron-magnesia mica also fill in cracks and crevices, and are clearly of secondary origin. The quartz is in comparatively large fields, but almost always has cloudy obscuration. This is one of the forms of schistose rock produced by meta- morphism of an intrusive plutonic mass. NOTES ON SAMPLES OF RUCKS. 373 42. These are other instances of the formation of schistose rock composed almost wholly of foliations of quartz grains in some parts of very small size and characteristically drawn out. In parts small “eyes” of felspar are observable, usually sur- rounded by narrow foliations of alkali mica. 45. The contact of aplite and quartz schist is shown in one sample. The former is of the character already spoken of, ortho- clase, microcline, and microperthite set in a mass of broken up quartz and felspar, with a little muscovite and biotite. The quartzite schist is very fine-grained, the quartz-grains being, as elsewhere, drawn out so as to be longer than broad. Here and there are grains of orthoclase. Scattered through this, and also separating the lines of quartz grains and thus producing a schistose structure, are numerous flakes of mica, mostly biotite. This is one of those very quartzose fine-grained schists which I have observed to occur near the contacts of great plutonic masses and sedimentary rocks into which the former have intruded. I have observed and described* such a case between the Limestone River and Marengo Creek. 33. An extreme form of metamorphism appears to be when the aplite has been completely crushed and comminuted and then regenerated into a fine-grained micaceous schist, but with traces here and there of orthoclase crystals and with secondary quartz. The rock has in such cases been so completely altered by meta- morphism that it is only by the traces of felspar that it can be distinguished from a fine-grained mica-schist produced from a sedimentary rock. (3) Quartz Hornblende ee ite. 28. This slice shows large broken and wasted crystals of hone blende of a yellowish- -brown colour and with the ends in tints of blue. It is not strongly pleochroic in shades of dull green and yellow. I found the obscurations in two crystals to be 10° 42’ and 17° 56’ respectively. Biotite also occurs in smaller amount, and is somewhat bleached with elimination of magnetite. The plagioclastic felspars are so much altered that no reliable obscurations could be obtained, but so far as they gave any results they suggested Labradorite. A smaller generation ‘of these felspars is included in the hornblende. 48. In another sample the felspars were numerous and more or less ideomorphic but much converted into mica. The only obscur- ation angles obtainable were 22° 22’ and 21° 20’ on either side of the twin plane in the zone P.K., indicating Labradorite. Horn- blende in this slice is plentiful but considerably broken and wasted. The obscuration in a section near to M., I found to be 16° 30’. * Notes on the Rocks occurring between Limestone River and Mount Leinster. Reports of the Mining Department, Victoria, September, 1890. 374 PROCEEDINGS OF SECTION C. Andesite. 27. This rock is a network of narrow plagioclase crystals, the meshes of which are filled in by a light-yellow to pale-brown augite, and associated with this a considerable amount of ilmenite, much converted into leucoxene. The felspars obscured at angles of 18° 22’ and 19° 27’ in the zone P.K., thus indicating Labradorite. The absence of olivine and the general character of this rock leads me to place it among those andesites which are very near to basalt. 51. One of the most interesting rocks in this collection is a holocrystalline compound of augite, amphibol, biotite, plagioclase, and orthoclase, the latter taking the place of a ground mass or of free quartz in more acid rocks. The augite is in colourless hypidiomorphic crystals, which have been broken and eroded, and have a somewhat unusually well- marked prismatic cleavage. The obscuration angles in a section near to M, I observed to be 42° 52’ in one part of the crystal, and 33° in another, the slice being somewhat inclined toward (100) G0 Po. There is a good series of augite crystals more or less converted into amphibole, the latter being very pale in tint, and having an obscuration of 12° 10’ on M, with a pleochroism in pale blue and pale yellow. These crystals have a narrow margin of chlorite. The augite is also commonly intergrown with biotite, with which crystals of magnetite are associated. The plagioclase crystals are hypidiomorphic, and are compounded according to the albite, Carlsbad, and more rarely the Baveno law. Measurements were not altogether satisfactory, but are given below. The exit of a bisectrix appeared in a slice approximately near the plane K. Zone P. K. — Zone P. M. 17" 59! 31° 43’ 21° 47’ 29° 31’ These observations point to a felspar of the Bytownite group. The orthoclase is in considerable amount, and fills in compara- tively large spaces, including other minerals, but especially plagio- clase crystals. It thus takes the place of quartz as a residual constituent of the magma. In only one part of the slice was I able to find a trace of cleavage in the orthoclase and in it obscuration was parallel. The margin of the orthoclase was in most places edged by growths of micro-pegmatite, especially as it would seem where there were terminal planes formed. Outside these growths were again small amounts of quartz which appear to be of original formation. The condition of this rock is surprisingly fresh and unaltered. In view of all these particulars I think that it may be placed provisionally among the andesites. OLIGOCLASE FELSPAR—VICTORIA. 375 No. 13.—ON OLIGOCLASE FELSPAR FROM MOUNT ANAKIES, IN VICTORIA. By A. W. Howirt, F.G.S. (Read Tuesday, January 11, 1898.) In studying the voleanic rocks of Victoria under the microscope, I have felt that the use of convergent polarised light might be made to give more conclusive results were it possible, in the first instance, to subject isolated crystals—for instance, of the triclinic felspars found in these rocks—to examination, and thus obtain data for reference. Unfortunately, it is most difficult to obtain such crystals, and the only locality whence I have obtained them is Lake Purrumbete, in the western district ; Mount Frankin, in the northern district ; Mount Anakies, about 20 miles northwards from Geelong ; and the Dargo High Plains, in Gippsland. In order to ascertain what results might be expected from such an examination, I selected several isolated crystals of a triclinic felspar from a number which had been collected in the volcanic detritus at Mount Anakies. These crystals were in good perserva- tion, and, although rounded on the edges and corners, the crystal- line planes were readily distinguishable. The crystals were compounded of the planes P (001) OP., M (010) «2 P ~,—1 (110) cob’ EF and. T (110) co BP: From each of four of these crystals three slices were prepared according to the planes P, M, 1, and T, and also in a direction normal to P and M. The samples selected for this paper are numbered I and II. In the three slices I determined the obscuration angles in P M and in the direction normal to P M with the following results :— I. Seen in this slice according to P with crossed nicols there are numerous alternations of very narrow and of wider lamella, arranged according to the Albite law. In the slice normal to P and M there is not only the same synthetic structure—hbeing, indeed, the continuation of the twin plates seen on P—but also a twining, as numerous and similarly arranged, according to the Perecline law, thus forming together a well-marked grating-like figure. Upon M this structure is not apparent. The observations made in slices of No. II were identically the same. 376 PROCEEDINGS OF SECTION C. The obscuration angles measured in these slices are tabulated below, being the mean of a number of nearly agreeing readings. No. P M | + to Pand M I Ab By 4p + 12° 30’ + 10° 0’ IT + 3° 3! + 12° 19’ ee ae Gy Seen by convergent polarised light, there is upon P the appear- ance of a bar indicating the exit of a bisectrix beyond the field of view on the left. Upon M there is the exit of the positive bisectrix, and upon each of the planes 1 and T there is the well marked exit of an optic axis approaching to a normal position to those planes respectively. These observations, which agree nearly in both samples, indicate a soda lime felspar of the oligoclase group. But the obscuration angles observed upon P appear to be somewhat high when com- pared with the data in a table prepared by Schuster.* An obscura- tion of 3° upon P and of 12° 30’ upon M may, however, be taken to indicate an oligoclase somewhat higher than the composition Ab. 6 to An. 1. In order to have a control over these results, I obtained a quantitative analysis of the remainder of each sample, which Mr. Francis E. A. Stone, the Analyst to the Victorian Department of Mines, kindly made for me. The two quantitative analyses are given below. Of the two, a preliminary examination showed that No. Il was the more reliable, and I therefore made use of it, with the following results :— I II Remarks. SiON ceniensces 62°98 62:22 (1) Fe,0,-tr. INGO G6 noaooapoc 21°88 (1) 22°42 (1) CAOR Cite 2°78 3°34 INGO: cmoceene tr tr. INe)5(O)s noodononane 5°00 6:14 Ke OM eccni 1:90 2°30 Unestimated loss: Nose 5°46 3°58 100:00 100:00 As to these analyses, Mr. Stone appended a note that in all probability they were rather low, as the laboratory did not possess the proper crucible for doing the fusions by Dr. Lawrence Smith’s method. I calculated out the analysis into equivalent proportions, and found, in tabulating the results according to the formule for * Hintze, Handbuch der Mineralogie, 1897, p. 1439. FULGURITES—NEW SOUTH WALES. ay id allite and anorthite, that there was a deficiency of about 1:7, equal to ‘9 per cent., of soda. Adding this in accordance with Mr. Stone’s note, and recalculating back into percentages, the analysis closed with + ‘12 per cent. of silica and — ‘5 per cent. of alumina. This calculation gave me a result of 84:10 per cent. of albite and 16:73 per cent. of anorthite as the composition of the felspar or ab. 5 to an. 1. According to a table given by Dana (Min. 1892, p. 327) the percentages thus found are about 3 per cent. too high as regards the alkaline constituent. The comparison of the optical and chemical examinations leaves the exact composition of this oligoclase in doubt in so far as relates to it being nearer to allite or to anorthite by one proportion of the former. But for all practical purposes, the observations of the obscuration angles, and of the position of the optic axial plane, appear to be sufficiently accurate to serve as a grade in diagnosing the character of a felspar observed in a thin slice of rock of the group to which the lavas of Mount Anakies belong. No. 14.—NOTE ON THE OCCURRENCE OF FULGURITES IN THESAND-HILLS AT KENSINGTON AND BONDI IN NEW SOUTH WALES: WITH A BIBLIOGRAPHY OF FULGURITES. By G. H. Kyisss, F.R.A.8.; J. W. Grimsuaw, M. Inst. C.E.; and Rev. J. M. Curran. (Read Tuesday, January 11, 1898.) Futeurires, lightning tubes, or ceraunic sinters (Fr. fulgurites, pierres foudroyées ; Ger. Fulguriten, Blitzrshren, Blitzsinter), as their name implies, are fused tubes or other fused structures, produced in sand, earth, or in rocks, by the action of lightning. They seem to have been first noticed by Pastor Hermann, of Massel,’ Silesia, who, however, erred as to their origin, since he failed to recognise that the fusion was due to lightning. It was, notwithstanding, early known that lightning causes fusion, as the papers of de Fischer,? Buchholz,* Tillet and Desmarest,‘ and Alleon Dulae® indicate; and, in his papers on lightning and lightning conductors, Reimarus® mentions that the points of conductors occasionally melted during storms. In his Alpine travels between 1768 and 1789, Saussure’ found small blackish 378 PROCEEDINGS OF SECTION ©. beads on the face of some slaty hornblende on the Dome de Gouté, obviously produced by the action of lightning. The directness of the evidence as to the origin of fulgurites is, perhaps, best illustrated in the account given by Withering® in 1790, published in the Phil. Trans. of the Royal Society. On 3rd September, 1789, a tree was struck by lightning, and a man who had taken refuge thereunder was killed. At the point of his walking-stick a perforation, 24 in. in diameter and 5 in. in depth, marked the place where the flash entered the ground, On digging, the soil was observed to be blackened for 10 in. more ; 2 in. deeper again melted quartzose appeared, and continued in a sloping direction for 18 in. the fused material having run down the tube formed. F. Humboldt’ obtained some fulgurites in Mexico in about 1803, from the summit of a trachyte peak, about 15,000 feet above sea-level. The fused mass on the walls of the fulgurite had apparently overflowed. About the same year articles appeared in Moll’s Annalen on “ Kieselsinter ;” one by Moll" himself, and the other by Emmerling."" In 1805 Hentzen” found a large num- ber of fulgurites in the Senne Heath at Paderborn, Westphalia, to which he gave the name lightning-tubes (Blitzrohren), thus identifying, by name, these structures with their cause. Hagen” reported i in 1823 that his son had actually witnessed the striking of a birch by lightning. On digging beneath it the fused tubes were found. In 1828 Beudant,” together with Hachette and Savart, made several small fulgurites artificially with powdered glass, and also with a mixture of powdered glass and salt, the latter being the more easily fused. The glass gave a tube 25 mm. in length, and with end diameters of about 3 mm. and 14 mm., the interior diameter being about} mm. With salt added, a tube 30 mm. was obtained of an average diameter of 44 mm., and an interier diameter of 2 mm. These tubes were produced by the most powerful electrical apparatus then available. Evidently there can be no doubt as to the origin of fulgurites. It may be mentioned that the suggestion that these siliceous tubes are formed by other process than electric fusion, since roots are sometimes found in their interior, was disposed of by Fiedler***”® at the beginning of the century, and the matter does not now require serious discussion. The occurrence of large numbers of fulgurites within an area of small radius led Darwin* to believe that they were often produced, not by lightning shocks at different times, but altogether. He concludes that, shortly before entering the ground, the lightning divides into separate branches, each forming a a fulgurite. Probably they are so formed—that is to say, more than one is often formed at a single flash—that the photographs of flashes lend a strong AUSTRALASIAN Assoc. Abv. Sc. Vot. Vil, 1898. PLATE XIX. locality Sketch % Ps ae ; ew reg Pp ce N, fulgurite with braraches RandniCh Racecourse Gilberts Annalen 47. aera mes & ' @& Linch + Sections oF Fillgur The figures O07 5.1 shew cepth : i of the Fulgurite at yarious pornts Gilberts Annalen Fulgurites in the Sandhills at Kensington, W.S.W. By G. H. KNIBBS, J. W. GRIMSHAW, and Rev. J. MILNE CURRAN. FULGURITES—NEW SOUTH WALES. 379 support to this positive element of Darwin’s view—is sufficiently indicated by the accompanying photograph taken by Mr. H. C. Russell, Government Astronomer. [A photograph kindly lent by Mr. Russell was exhibited.] The very numerous perforations of rocks, however, as, for example, on Little Ararat, reported by Abich® in 1869, is a sufficient proof that the same place is repeatedly struck. It is idle, therefore, to speculate, much more to dogmatise, on the question of the simultaneous production of any series of fulgurites. The fulgurites at the Kensington Sandhills were discovered by J. W. Grimshaw, and those at Bondi by J. M. Curran, by noticing the small pieces broken off where the tubes, through the wind shifting the sand, had been left exposed. Pp P. effusum, R. Br. A tall form, A tall branching grass, 3 to 4 feet high, with large spreading panicles, Oplismenus compositus, Beauv. A hairy, spreading grass, commonly met with in scrubs. Setaria macrostachya, H. B. and K. A tall, leafy grass, of scrub lands, mostly found on the border of scrubs. Cenchrus elymoides, F v.M. ‘Scrub Burr-grass.” A tall, coarse, erect grass ; spikes often 6 inches long. Thuarea sarmentosa, Pers. A creeping grass, met with upon the coast sands. The erect stems short. 446 - PROCEEDINGS OF SECTION D. Arundinella nepalensis, Trin. A tall, harsh grass of erect growth, met with on the hills. Pollinia irritans, Benth. A grass of 2 or 3 feet in height, with several spikes in the head. Rottboellia formosa, R. Br. Stems from 6 to above 12 inches high, with more or less hairy leaves ; the cylindrical spikes very fragile; the articles with purplish hairs. Very plentiful. R. rarittora, Bail. A procumbent, weak, but very troublesome, spear grass, too plentiful on the island. Ischemum fragile, R. Br. A slender grass with narrow leaves ; spike single, rigid, on a long peduncle. Heteropogon contortus, Rem. et Schult. ‘ Bunch spear grass.” A troublesome spear grass, 2 or 3 feet high. Awns often 2 inches long and very much twisted; the heads of a number of stems often adhering together and forming large dark-coloured masses. H, insignis, Thu. ‘The tall spear grass.” Spikes often 5 or 6 inches long without the awns, which are about the same length. Andropogon exaltatus, R. Br. Stems 1 foot or more high; leaves very narrow, sometimes subulate from the sheath. Nodes glabrous ; spikes two or three together, densely hairy. A, lanatus, R. Br. Leaves usually flat but narrow ; spikes densely woolly-hairy. Chrysopogon parviflorus, Benth. ‘Scented golden beard.” A large tufty grass, the inflorescence strongly scented. Speci- mens received from E. Cowley, 1893. Eriachne squarrosa, R. Br. Stems about 2 feet high ; nodes with long silky hairs; panicle dense ; outer glumes hispid ; awns about 1 inch long. EH. ciliata, R. Br. A pretty grass usually under 1 foot high, often only a few inches; leaves hirsute, with spreading hairs ; spikelets few. On hill-sides. Cynodon dactylon, Pers. ‘Common couch.” Met with on the well-trodden ground. Chloris barbata, Sw. var. “ Bearded Star-grass.” Plant, 2 to 4 ft. high; the spikes numerous in the head, dark, and very hairy. FLORA OF THE TORRES STRAITS. 447 Eleusine cegyptiaca, Pers. ‘Small Crow-foot Grass.” A very common grass upon the island, usually on the flat land, Spikes, 3 to 5 in a spreading head. Dr. W. E. Roth gives an interesting account of the mode adopted by the natives at Boulia in preparing “damper” from the seeds of this grass, called by them “ ya-ra-ka.” ‘“ Ethnological Studies among the N. W. Central Aborigines.” Triraphis mollis, R. Br. Panicle narrow, dense, 4 to 6 in. long, having a soft appear- ance. Eragrostis Brownit, Nees. ‘ Love Grass.” A very variable grass, met with in most parts of Queensland. Ectrosia leporina, R. Br. ‘ Hare’s Tail Grass.” A glabrous grass of 1 or 2 ft. ; panicle dense, soft-looking, and 3 to 6 in. long. ACOTYLEDONS OR CRYPTOGAMS. The small number of cryptogamous plants which I am enabled to record as baying been observed on Thursday Island may in some measure be accounted for by my visit to the island having been made at the dry season of the year, and from the fact also that what is considered there as the wet season had this year passed over without the usual quantity of rain. I, however, do not think from what I saw of the vegetation that this particular island is one likely to furnish any great variety of these plants. On some of the other islands, having a better water supply and larger area of scrub, these plants are likely to be found more or less abundant. All I can record at present are— . Filices. Lygodium japonicum, Sw. Polypodium scandens, Forst. Notholena fragilis, Hook. NV. Prenticei, Luerssn. Fungi. Polyporus fruticum, Berk. On the twigs of trees. Polystictus cinnabarinus, Fries. On dead wood. Dr. Roth informs me that this common red fungus is worn as a forehead ornament by the natives of Keppel Island. Uromyces fusisporus,* Cke. and Mass. Phyllosticta Acacie,* Cke. Both on the phyllodes of acacias. * Not previously recorded for Queensland ; determined by Dr. M. C. Coeke. 448 PROCEEDINGS OF SECTION D, No. 2.—PLANTS OF THE RABBIT-INFESTED COUNTRY, BULLOO RIVER, &.Q. By J. F. Barney. (Read Friday, January 7, 1898. ) Eary in November I accompanied Mr. C. J. Pound, the Govern- ment Bacteriologist of Queensland, on a trip to the Bulloo River district, where he was carrying out experiments for the destruction of rabbits by means of the chicken-cholera microbes. This offered a good opportunity of making a botanical examination of the locality. The season was not one that could be called favourable for the purpose, as little or no rain had fallen for the previous twelve months. On our arrival at Thargomindah, the post-town of the district, we were detained for some days on account of heavy rains. Our first camp was at Dilltoppa, about 45 miles from Thargomindah, and on arrival here we found that the rain had given rapid spring to the herbage, so that we were able to form some idea of the plants growing about. From here we worked our way to Koopa and Cooliata Sandhills, but found little change in the vegetation. Our time being limited, and the difficulty of travelling being increased by the rains, we were prevented from visiting the part of the Grey Range running through the district, where it was hoped the principal novelties would be obtained, as little or nothing is known of the plants of that locality. The following list cannot be taken as representing the flora of the district ; but will give some idea of those plants which were able to withstand the severity of the climate of those parts, and produce food when all else is parched up. It was impossible to identify those which had sprung up owing to the recent rains, and causing the country to look so green, as they were, of course, in too young a state. I am indebted to Mr. Pound for the photographs which accom- pany this paper. CAPPARIDES. Capparis Shanesiana, F.v.M., and Capparis nobilis, F.v.M.— Fine specimens of these handsome flowering small trees were met with, and were a pleasant sight after the dreary stretches of mulga, gidya, and coolibar. PITTOSPORE. Pittosporum phyllyreoides, DC., in young fruit was noticed growling near a dam. PLANTS OF RABBIT-INFESTED COUNTRY, §.Q. 449 FRANKENIACER. Two varieties of Frankenia pauciflora, DC., viz., serpyllifolia and thymoides were growing in sand on the edge of a large lagoon. Both have pretty pink flowers, but are of quite different habits, the former lying flat on the ground, while the other is erect. PORTULACEX, Portulaca. oleracea, Linn.—A large-flowering variety of this common garden weed was very abundant. The natives use the seed and also the whole plant for food, and at times even bushmen use it in the latter form. MALVACES. Abutilon Fraseri, Hook., with its large yellow flowers, looked very gay among the smaller kinds of salt-bush. MELIACE. Owenia acidula, F.v.M. The Emu Apple or Grewie of the natives. Clumps of these trees in both flower and fruit were occasionally seen. They form very handsome trees, having dense dome-like heads, and branch out about 7 feet from the ground. Probably this is due to their lower branches being cropped by stock, and as no young plants were seen they evidently eat these also. Plate XXII. SAPINDACEA, Atalaya hemiglauca, F.v.M. The “White Wood,” is very abundant throughout the district, and according to report is often cut down, in times of drought, as food for cattle, but is said not to be over-relished by them. It was occasionally seen in flower, but most of the trees were covered with the curious winged fruit of the genus. Plate XXIII. Dodonea attenuata, A. Cunn. Oue of the so-called hop-bushes was growing in great profusion on the sandy ridges at Dilltoppa, and the sandhills at Koopa and Cooliatta. The rabbits seem very fond of the bark, for we found it stripped to some considerable distance from the ground, with the result that most of the trees so treated die. LEGUMINOSE. Psoralea patens, Lindl. Small plants of these were seen. Ac- cording to E. Palmer, the natives obtain a fibre from the stems. Two Cassias were met with rather frequently, viz.:— Cassia eremophila, A. Cunn., with long narrow leaves and brown pods, and Cassia phyllodinea, R.Br., with silvery leaves and bright yellow flowers, the perfume of the latter, when fresh, reminding one of the heliotrope of our gardens. 2F 450 PROCEEDINGS OF SECTION D. Acacias.—The principal species of this genus in these parts is A. aneura, F.v.M., the Mulga, two forms of which were seen, one having very narrow leaves. They have been cut down for fodder, and also eaten down very extensively throughout the district. Plate XXIV. The Gidya, Acacia homalophylia, A. Cunn., is the largest Acacia to be met with. The unpleasant odour from the foliage of this tree, especially after rain, is said to often cause a kind of fever in stockmen and others. I did not notice that stock ate the leaves, but was told that they sometimes eat the young pods. Plate XXIII. Acacia salicina, var. varians, was noticed growing near water. On the banks of the river, and its billabongs, was growing Acacia stenophylla, A. Cunn., the Dalby Myall, with long drooping leaves and pods, the latter moniliform. ‘This forms a very graceful shrub, Other Acacias were A. harpophylla, F.v.M., the Brigalow, with long, boomerang-shaped, silvery leaves—Plate XXI; A. Oswaldi, F.v.M. ; A. decora, Reichb., with its light-green foliage and thin pods, making a most ornamental shrub; and A. tetragonophylla, F.v.M., a straggling shrub with globular heads of yellow flowers, and clumps of short needle-like leaves. MYRTACE. ‘ As in most parts of Western Queensland, the commonest eucalypt is #. microtheca, F.v.M., the “Coolibar.” Plate X XI. The largest eucalypt of the district is Mucalyptus rostrata, Sch., which is found by the side of the river and its billabongs. The trees were laden with flowers, and those on the long drooping branches produced a most attractive sight. At Koopa, most of the trees had large nests of the hawk of the district. Another large eucalypt was £. ochrophloia, F.v.M., the “ Yapunyah.” The base of the stem is black, and the upper part, as well as the branches, reddish pink. The leaf is large and thick. The only other species of the genus noticed was Z. corymbosa, Sm. Bloodwood. Melaleuca ericifolia, Sm. ein = P 6 Shs eens - y Spe - —_ a ks = a + a . bteat ek nani 4? AUSTRALASIAN Assoc. Abv. Sc. VoL. VII, 1898. PLATE XXV. MUEHLENBECKIA CUNNINGHAMII, F. v. M. Plants of the Rabbit Infested Country, S.W. Queensland. J. F. BAILEY. | PLANTS INDIGENOUS TO NORTH-WEST OF VICTORIA. 455 No. 3—NOTES ON THE PLANTS INDIGENOUS TO THE NORTH-WEST PORTION OF THE COLONY OF VICTORIA. By Sr. Exroy D’Atron. (Read Tuesday, January 11, 1898.) [ Abstract. | Tue district to which this paper refers lies between the river Wimmera and the South Australian Border, in the extreme north- west corner of the colony, indicated on the map as the counties of Lowan and Weeah. With the exception of the river Wim- mera, this territory is totally devoid of anything like a river-bed or water-course, with perhaps one or two exceptions, where com- paratively short streams, flowing only in very wet winters for a few months, empty themselves either into run-away holes, or shallow depressions, which for a time may be regarded as swamps, but which for several years in succession might have been dry enough as to be put under cultivation. The river Wimmera is of the usual typical Australian sort—a chain of water-holes. In wet winters, when these holes are full, the water flows into Lake Hindmarsh ; from thence the course of the creek may be traced to Lake Albacutya, Wonga Lake, Pine Plains, and some miles to the north of Pine Plains, where it loses itself amongst the sand- hills of that region, which forms a belt before reaching the river Murray, from the south. The district referred to is traversed from east to west with belts of fertile, undulating country, separated by strips of poor, sandy scrub, or thick mallee, varying in width from 12 to 60 miles, the line of demarkation between the good and the bad land being sharply defined. In the south-east corner of the district Mount Arapiles rises, a conspicuous object, abruptly out of the plain, toa height of about 1,060 feet, its eastern side presenting a bold escarpment of red sandstone, several hundred feet high. Standing about half a mile away is a rock, which from its shape is called the Mitre rock. The summit of this rock cannot be reached on account of its precipitous nature, and in its clefts and crannies grow several species of plants, which will be alluded to further on. The mount can be ascended in many places, particularly from the west side, where there is a deep gorge through which in wet seasons a small stream trickles. In the precipitous eastern face of the mount are two or three very steep, rocky clefts or gorges, and it is in - such places that the rarest plants are to be found. This is the 456 PROCEEDINGS OF SECTION D. only eminence that has any claim to be called a mount in the whole north-west territory. Low ranges of sand-hills, covered with scrub and porcupine grass, are the nearest approach to hills, and these for the most part trend from south-east to north-west. One of those strips of useless country, a spur of the South Australian 90-mile desert, which extends in an unbroken line due east to the Wimmera River, is called the “ Little Desert,” as a distinction from the Great Desert, which is another spur running nearly parallel to it some miles further north. One of those scrubby ranges of low hills above referred to nearly connects these two strips about half way between the Wimmera and the South Australian Border, and this is known as the Lawloit Range. Red sandstone and a conglomerate rock of iron-stone nodules embedded in sandstone abounds om those ranges. In many places extensive tracts of limestone exist, usually in con- junction with iron-stone. Close to Mount Arapiles are several large salt lakes, and in the northern parts large quantities of gypsum exist, either as a white dry powder piled up in hillocks, or as a solid, in the form of transparent flakes. The swamps may be only regarded as such in wet seasons, and are nearly always dry ; but within the last six or seven years most of them got full to overflowing, and are now nearly all dry again. What is regarded as the best agricultural land consists of the so-called crab-holey plains, the soil being of a very clayey nature, thrown up into low mounds. the depressions between being usually full of water in the winter time, and of low loamy rises, with here and there a few isolated sand-dunes covered with cypress pines and scrub. Approaching the desert country, the soil is much of the same clayey nature; but instead of being comparatively open country, is for the most part thickly clothed with mallee scrub, composed of various species of Eucalyptus, as well as other genera, such as Dodonea, &c. The farmers have taken possession of this fringe, and nearly the whole of it has been rolled down and put under crop. As we get further in, the soil changes for the worst, till at length we enter the desert proper, which has already been described. Such is a brief description of the district to which this paper alludes, and which is meant to convey to the reader an idea of the nature of the various soils in which the plants flourish, and the conditions under which they exist. Taking the belt of good land first, we find that on the crab- holey plains many plants exist which are not to be found any- where else, namely, Swainsona procumbens and S. phacoides side by side with the yellow-blossomed Zygophyllum glaucescens, Sida corrugata, Ptilotus exaltatus, Kuphorbia Drummondit, Kochia villosa, Kochia microphylla, Atriplex halimoides, A. semi- baccatum, Bassia bicornis, Mimulus gracilis, may be found, eome on the hardest and driest patches and others, particularly Mimulus PLANTS INDIGENOUS TO NORTH-WEST OF VICTORIA. 457 gracilis, where the water lies the longest. Pimelea glauca is very plentiful on some or most of the plains; also Eryngium rostratum, but which, owing to the avidity with which sheep and cattle devour it, is fast disappearing. The Composite family is largely represented by several species of Brachycome, particularly B. pachyptera, and by the following :—Minuria leptophylla, Calotis scabiosifolia, C. hispidula, Myriocephalus rhizocephalus, Oraspedia globosa (rare), C. chrysantha, Eclipta platyglossa, Helipterum Dimorpholepis, Goodenia heteromera, Teucrium racemosum, and a particularly bad weed, Helipterum corymbiflorum, which has taken possession of whole tracts previously cultivated. Onsome of the drier rises we are sure to find the lowly Gnaphaloidee uliginosum, also Podolepis canescens in conjunction with its more widely distributed relative P. rugata. Angianthus strictus is another small plant which prefers the dry hard rises, and where the Bursaria bushes abound, may be found growing amongst them, Zviolaena tomentosa and Helipterum anthemoides, Comes- perma ericinum, Stenopetalum velutinum, Chenopodium nitrart- aceum, Haloragis odontocarpa and Chenopodium microphyllum. Such plants as Helipterum pygmaeum, Toxanthus Muelleri, T. perpusillus, occur on the loamier soils. The grasses for the most part are represented by Danthonia penicillata, Agrostis Solandrt, Bromus arenarius, and Poa Fordeana. The only timber trees prevalent on these plains are the Bulloak (Casuarina glauca) and a box (Eucalyptus largiflorens.) A species or variety of Casu- arina, of low growth, possessed with a comparatively smooth bark and long flexuous stems, occur in the stiffest soils at rare intervals. The fruits differ materially from those of C. glawca and C. quadri- valvis. Specimens sent to the late Baron von Mueller could not be identified by him, and a doubt still exists as to whether it is a variety or aseparate species. On the loamy rises and lighter soils occur Menkea australis in conjunction with plants extending to other parts of the colony, also Lappula concava. Calocephalus Drummondi, and Quinettia Urvillei, plants hitherto thought to be confined to West Australia were identified by Baron von Mueller from specimens gathered in this locality by the writer. On the drier soils we find the Bulloak still the prevailing timber tree, never much more than 18 inches in girth and 50 feet high, associated with a smooth-barked variety of Eucalyptus leucorylon, termed Blue gum by the settlers. Insheltered spots may be found small trees of the sweet Quandong, Santalum persicarium, also Hakea leucoptera. These are, however, becoming rare, in consequence of the land being put under cultivation. Amongst the plants found on the scrubby rises may be found at rare intervals the small purple-rayed composite Calotis cuneifolia. Two shrubby species of Aster occur, but are restricted to separate and distinct areas, namely, 4. pimeleoides and A. decurrens; the former a 458 PROCEEDINGS OF SECTION D. rather attractive plant, with large white-rayed flowers, the latter possessing white flowers of small size, and exuding a glutinous secretion from both stems and leaves. In the open glades occur large patches of Leptorrhynchus, Waitzia, and at rarer intervals Helipterum floribundum, also the little yellow-flowered H. Jes- senit, H. moschatun is also partial to such localities, but at still rarer intervals. Hlachanthus pusillus is another small annual composite peculiar to some loamy soils, generally growing in patches. Cassinia arcuata occurs as a tall shrub in a few places, but is fast dying out. As we get nearer to the desert country, the scrub thickens, and mallee scrub proper is entered. The soil for the most part still retains its clayey nature, resting ona stratum of limestone gravel, with an occasional pine rise to break the monotony. Deep depressions are numerous, and these gener- ally terminate in a run-away hole. The land being suitable for wheat-growing, is now, nearly all, brought under cultivation by means of the mallee roller and stump-jump plough. Here may be found some of the most typical plants of this region, such as Myoporum platycarpum, a small tree, and, at rarer intervals, M. deserti, a bushy shrub. Hriostemon pungens, and the pink flowered EH. diformis, Bertya oleifolia, Dodonea bursarifolia, Cassia eremophila, Acacia spinescens, A. rigens, A. calamrfolia, A. acinacea, A. montana, A. hakeoides, A. salicina, A. trineura (a species with seented wood), dj tees E. heemastoma...... St cepoeson steleisisinsia|| | maeite déao x 55c8 EH). MACKORT NY NCHA 5 a suc ssraejren soaaeaactieel cetera x Basta HK. melliodora ............ por monnaeines facudcoc x Kr S cahal Mabe dere : H. polyanthema ..........scs.e00 Sreonendode| fmenpanioan x Sac paste K. tereticornis....,.... sis cise asieseinete eck ae ee x saanleiedle Sache NAST WAT EIAMA) -..,-rsesciacenetnmemeemeseneen eee x ws Ge cron. Be) vam alis| see ecos- alan eineetslis cates semi patwieane : x Ei enn Ph Oar sesconsnsesavascsonasemmenarncAlhh esos x Leptospermum attenuatum............... x x MS AISLE ETU o ee senso oe ane adeacoe apenas x x Calytheia tetragona:....se.c-co.tecnspaseeel) ce ose x boscubces Umbellifere Hydrocotyle laxiflora... .5.0..0..- +. sete x saicec seas eapcdee Siebera (Trachymene) ericoides .. ...... xB x eel co eee S. linearifolia ....... sieeielsinanateeie base aaeiae tia wseteanine x ssteasie tod Eryngium rostratum...,.........5 Seeeeiecs x Yapmiatiiaes ssaaroitaeiae Onagracee— Epilobium tetragonum ........ 1... oe x x Pe ae Sus-ciass I].—MonoperaL. Boraginacew— Lappula concavum ..........c.ceeseeees ac dae Mile | eens ate chbesod0r Cynoglossum suaveolens ............00006: Sa ema Satelnccl Sob lik dooce a0 Eritrichum australasicum ..............5 x 200008002 a seaisbistts My oso bisiaustraliseaseemcaceracescsecereeee x dosnt atete ot Lateran Convolvulaceaw— Convolvulus erubescens ......... mel erento x x eee Cuscutacee— Cuseuta australis!) f.c-.sses-e- eee Tene x Sewsenincn Wh) Seems sot Epacridece Brachyloma daphnoides ..... Boban cataadsl. GouDbonco x x Tassambhel Strigosa, «.. tcacssctsqonsasente seal sateen * se Hpaerts! palud osaw I eI ee tcopoac Co paludosaicnavsscersvsssasbavccsoracdeeschl! aunssene x iene Euphorbiacee ~— Bhyllanthus thiymordes) Secs. s-cae-eare| eerste » I oe ocosoc Poranthera microphylla .................. XB.” 2]... oseasceten| iemeemeceee Lauracee— GCassythaiglabella) cc. crcecccssseseesousseen|| aeececactet SA es CSP. Api eaesannave. see sesowvasectadtinsessce|| cseevesense Ke, i eae Polygonacew— Polygonum subsessile 3. scs..c.-ee ere see > a eerie ||P c005000° Proteacew— : Banksia marginata .......... ngaacanne 3-400 XO ai) chee came Gradanes Grevillia acanthifolia ..........c.0.:-0.00 XB x <) UDagareeees Garamenaniasavarecanescensr ener snes cenes lamer esere > “All| eae ite G. floribunda ..... Fess meiavae qar @ocratee cal lee seitel metal eect < | il weehaea Hakea pugioniiormis~ 770 cccecesre ce sme sese| mescuenttt ye ccc FETA ClCUlaLis: .cwscceahsccescccencsssescosssepl) Ceacemses x x EL AIMICLOCAL DAM acct eee seer ecscceeneee: x x ~S uN} ceeneeee IRELSOOMTAMIMCATIS | eacesteasnerenseaceters cl limccEeearee <_ |. || eee fl Eee ata (0 E Wire e Nes Aoo Annan nee Ooee ee Wines cats. |eeaeecease x Thymelee— Pimelea linifolia.............. anaes sineroaeree x EME MeO Gc ic I CULVITL OLA panenecaemociee anne soscaneancnns oe FO etree esto oFisac Pe glawcarecn...2 Petre tv netarmnr oes cause Nnad ote KTS IAG veda cea eee PHiGOlOTANS! Sie cessed cass cnet oneal vcd} = esiteaeeee yn AAAS cicob 12% INERT poop ndocco0aner ere ered | rasdococau al bMecrintibcoc x Loranthacece oranthus pendwlis) 222. cc..ccsnccvceeeee|) wares BSE x | aaa Santalacee— Choretrum candollei........... Faas oainwe| URNeeRe eens 300” Bal he eae @taterifolinme secs Gel cacatecattecdcnenal) aieeeeeeee x =| Se LPO CONS SBI, copacansasncoavoacncoson oes xB x «| RR EEE CU PECSSIORMIIS otccgoc-cicistnceccceatecie sett Mestieeeeeen aca uate ares * Sus-cLtass 1V.—GyYMNOSPERME. CLAss—MoNoOcOrYLEDONS. Coniferce-— C@allitrisicalcaratare rm rreremene tera xB iy hl a epee Liliacee— Sbypandraro lau cay cppenscessuee seeder Ssuoaeer x x An guillartay dioicaee cece -ne-casesaeteeees: x x | x Burchardia umbellata ...... Paseo aer seis eeacnies ; X ole Sheets Asphodelus fistulosus ............s0se0e00: x | x [oe Dichopogon strictns p..ncc.se.s--.0c02yes90s x “ | teeeeaes axmanniayoracilign perpscedsc ceca Mameeraecs x | wagered FLORA OF BATHURST. 481 | Granite. Silurian. CLASS I—DICOTYLEDONS—continued. CLAssS—MOoONOCOTYLEDONS—continued. Liliacee —continued. Dianella cxermileay Fesceavchennis-semcetabceics RET A yeaa. ERRICOMY MEIC AMLOM es earecesesacscene sestinssi x¥ © || asesooe EMV SANOLUS) JUNCCUSH cxcecense oncsecenosve x x i Pabersoni .......... ae dousespemietisubaeeecee Seer ees x Alismacee— Alisma plantago...... ppdoaogdanpanopoNeecnG 53 |) Barsannor Juncacee— Xerotes Brownli ............... SeSnonsccuNg|| — BoSonsa8e x 285 LITT aca Se Qeassnosnc sieeateless ravens eee: x seaaenlat XJ longifolia ........ Pogbe aOR nae sade Og Ie xB oe Tridacea— WAPELSOUIAISETICER, feiss seniinide sunieiielsiesaes os ee ans x Orchidaceea— Caladenia dilatata ........... Seba eenadetninsel vies wane x STURT ce cin cam wancionbass sab scehos Sgpncnaer x GRICOREES EA cass 0-cononetvedseencepeseddswecae] Uadexenass x Diuris aurea ..... Sdaabaletatsasionb aniaotawion 5365 x ieee POR ORAR ATA oh scics ca tosi-aaios don cenipennesavesns x Sissoasbe Pera CU lata. cnc < acptneteneces Meeinas: sdese|) -aveseidees x Dy peduneulata ...:....0...0000s ppdnad 9009: x seoLsaCS: POPP ENINPR (522 wgckbano Socussens os «sKkeos x Pon mopchilus aatumNalisy 5... cceisaniepoceesee |! - aveenroee x CGTOSSOC TARA TON salve cwslseeniele sf 78 122 128 140 Ge Dwberoides|a.c....02-.o:2000. 2 | 3 7 7. Hyphomycetes ............ 47 109 | 123 152 8. Spheropsides .............. 6 115 128 152 9. Saccharomycetes ......... ee 4 10 10 TOM Ustilagines|s..c4..sssee ans 18 28 39 48 ke ehyecomycetes: “\....0.1.6 4 12 15 21 12) Myxomycetes..x....:...0.:. 31 48 52 52 PGP AS ts cecatonanne: 1,189 2,067 2,284 2,480 Tt will be seen that between 1883 and 1892 there is an increase of 878 species, and this increase occurs in each of the twelve groups. The additions are most marked in the Hymenomycetes, Uredines, Pyrenomycetes, Hyphomycetes, and Spheropsides. Between 1892 and 1897 there is also an increase of 413 species, and this is partly due to recorded species overlooked by Cooke, but mostly to actual additions to the Fungus-flora. There is an increase in each of the groups, particularly in the Uredines and Pyrenomycetes. * * * * *K * * * * * If we turn now to a more detailed view of the fungi, and examine their distribution, not only in the various groups, but in the different Colonies, there are many suggestive points of comparison, as shown in the following tables. 484 PROCEEDINGS OF SECTION D. Table I1I.—Number of Fungi in the different Colonies, arranged according to groups, together with those common to Britain. Groups. Australia. wea.| eA |) Ws Wo ssw, Q.. | B. 1. Hymenomycetes 19 137 | 151 | 245 | 603 | 266) 624 | 466 2. Gastromycetes ... 5 44 | 26} 46 72 45 92) 32 SW regimes: nears. Boer oa Ll alae ox! 79 26 28729 4. Pyrenomycetes ... 9 19) 185) Go 93 41 | 132) 56 5, Discomycetes...... 3 8 | 20) 52 71 12 388 | 54 6. Tuberoides........ hace fl estes 1 Sif oe Bo 1 ie oes 7. Hyphomycetes ... PA es le Nh Fe ca 80 32 62 | 57 8. Spheropsides 2 | eo) |e oe eaO 88 11 60 | 13 9. Saccharomycetes NO xae ta Gy ee en sits Sistine 10. Ustilagines......... 1 dece|| dl 5 28 11 18 | 10 11. Phycomycetes ...) ... 1 4 7 15 5 5a al 12, Myxomycetes ...) 2 16 3| 20 13 5 29 | 38™ 53 | 243 | 278 | 500 |1,142 | 454 |1,089 | 766 Table IJI.—Number and relative proportion of Fungi in the different Colonies in the order of their predominance and proportion of British species. No. Proportion. Wilctoriay acne ceneunthietecrmncocee 1,142 46 per cent. QweenslanG Tshecssowwatmnn ccm ctmuniave 1,089 AS Oma MAS MANTA Se aeawe cceeieeeesentiteatorsiontente 500 20 Pe INiews SouthaVWiales) iano ceserscceneenete 454 18355 SoubheAarstraliaesencecteecscesunscekien 278 TPA 5s WiesteAtustrallian pamaceuecceemn cert 248 9°85, IB ri baty eiciaees poheeec taeeract esos emanate 766 30°9 _,, Tt has to be noted here that these proportions do not by any means represent the true proportions in nature, but rather the amount of attention which has been given to the subject in the different Colonies. It is not to be imagined that the proportion of species in New South Wales is really less than that in Tasmania, or only 2} times that of Victoria, but the explanation is to be sought in the fact that both Victoria and Queensland have been favoured in the past with indefatigable workers in this particular line. When I state that one-eighth of the entire Fungus-flora of New South Wales has been added during the last three years, it will be seen that the labours of such workers as Dr. Cobb, and Messrs. Maiden and Baker, are beginning to bear fruit in the much-neglected department of systematic mycology. Victoria has the highest percentage of species—or 46, closely followed by AUSTRALIAN FUNGI. 485 Queensland, with about 44, while West Australia has the lowest with 9:8; 766 of the total number of species are British, or about 31 per cent. Now that the Agricultural Bureau of West Australia has a resident botanist in the person of Dr. A. Morrison, who has already done good work in the fungi of Victoria, we may shortly expect to have the numbers there largely increased. GEOGRAPHICAL DISTRIBUTION. While I have indicated how the fungi are numerically distri- buted in the different Colonies, I feel that the time has come when the geographical distribution within each Colony should be carried out in detail on a scientific basis. The Government Botanist of New South Wales, in his anniversary address before the Royal Society (1897), has already suggested the use of county maps and parish maps for recording the exact localities of economic plants ; but we also require, as he has hinted, the different Colonies to be divided into well-defined geographical areas. Natural divisions based upon the drainage of the country, or other natural features, would take the place of merely arbitrary districts determined by the outlines of counties ; and as these natural districts apply not only to the flora, but the fauna—would be, in fact, biological regions. I consider that such districts might best be settled for each colony by a joint committee of naturalists chosen by an association for the advancement of science such as this. The number of genera in proportion to the species may also be taken into account as in the following table :— Table IV.—Number of Genera in proportion to the Species in the different Colonies. Genera. Species. Proportion. WrestrAtustralliay sgrscaodsenonteeaen once end stietel 126 243 51°8 SOUbhpAMIStraltarcs.scn ese acceso cme beste 128 266 48:1 MIP US TIAA INTE cre cicachsisiacte sorrectatirteiaemais iste ecgaisicierst 221 500 44°1 ING Wa SOW Widlesiaascssassmoxevesteceustucuaes 161 454 35°5 BVAT COO Rl teri stecrsciose sissveinnd anise tcisamaarsin nmin 304 1,142 26°6 Mucosal Aes ens ce caxssoventn- ce SieseseneOswaee ees 281 1,089 25°8 PANS Ora oa esi ra; oes Osa aetna nes, Gases ese tereeuer 447 2,480 18 The number of genera in proportion to species is naturally jarger in those colonies where the species are not yet extensively known, while for the whole of Australia the proportion is 18 per cent. The three genera which contain the most species are 486 PROCEEDINGS OF SECTION D. Polyporus (94), Polystictus (93), and Fomes (57), but it must be borne in mind that the sub-genera of Agaricus, for instance, are raised to the rank of genera. The edible fungi, especially our native species, have still to be tested in most cases. Mr. Maiden, in his presidential address before the chemistry section of this association, at Brisbane (1895), on ‘“‘The Chemistry of the Australian Indigenous Vegetation,” showed that our knowledge of the chemical composition of these plants is almost nil. I have mainly selected those which have been found wholesome in Britain or America, and which may be eaten with impunity, not necessarily with relish. The number at present is 84—73 belonging to the hymenomycetes, 4 to the gas- tromycetes, and 7 to the discomycetes.