& V80S78/0 WUT LOZL ¢ i Digitized by the Internet Archive in 2009 with funding from University of Toronto http://www.archive.org/details/cyclopaediaoruni14rees , a ee ar’ I sn ht A i y 7 i) 1 4 : . _ - - 7) ' 7 i > 1 ‘ #i» ‘ ere 1 Si - , LJ A 7 n ! “i THE CYCLOPADIA; OR, dntversal Dictionary OF ARTS, SCIENCES, AND LITERATURE. VOL. XIV. we 6 , “2 pALCR. Oo qiqnal ie Where a { 4 Pal et A ITAATT (Re pte FLX te ~ Printed by A. Strahan, ——- New-Street-Square, London. , : $ as i Cts THE ee CL OPA DIA: OR, UNIVERSAL DICTIONARY OF Arts, Sciences, and Literature, BY ABRAHAM REES, D.D. F.R.S. F.L.S. S. Amer. Soc. WITH THE ASSISTANCE OF EMINENT PROFESSIONAL GENTLEMEN. ILLUSTRATED WITH NUMEROUS ENGRAVINGS, BY THE MOST DISTINGUISHED ARTISTS. Sunes: acne IN THIRTY-NINE VOLUMES. VOL. XIV. eR LONDON: Printed ror LONGMAN, HURST, REES, ORME, & BROWN, Parernoster-Row, F.C. AND J. RIVINGTON, A. STRAHAN, PAYNE AND FOSS, SCATCHERD AND LETTERMAN, J. CUTHELL, CLARKE AND SONS, LACKINGTON HUGHES HARDING MAVOR AND JONES, J. AND A. ARCH, CADELL AND DAVIES, S.- BAGSTER, J. MAWMAN, JAMES BLACK AND SON, BLACK KINGSBURY PARBURY AND ALLEN, R. SCHOLEY, J. BOOTH, J. BOOKER, SUTTABY EVANCE AND FOX, BALDWIN CRADOCK AND JOY, SHERWOOD NEELY AND JONES, RK. SAUNDERS, HURST ROBINSON AND CO., J. DICKINSON, J. PATERSON, E. WHITESIDE, WILSON AND SONS, AND BRODIE AND DOWDING. 1819. yor a ae aire wien) VRE e yale Piss ae Ty v4 AS Bg AM eo Aa fvewegen at we 6 ain ane es | if SAA LA TA sis 1) Seg ee eT el te = 3 > ee we oa ee : ~ ~ | f = . Ls é Ala R10 108 RAY TOL ke it 2a LOL6OSS ve ae re wil er at et1X% Ov . | i 4 UGA « t de 3 vearabeh foe etn na leredon Seger, ae ced shhh OKA 2D, KT AD eVE ap ene kt hig Are bh PERO” Tege eekna dm a AOROT aa’ ar garam Ogi re.cor ys, Deis Bh eee Shot De ve aby elie & To , Ayas . oe > CLOCLOPUE DT 2: a OR, A NEW UNIVERSAL DICTIONARY OF ARTS and SCIENCES. FE xv . is applied, in the Schools, in various fenfes. Sometimes it fignifies a thing’s not belonging to the ef- fence of another; in which fenfe the efficient caufe and the end, or fcope of a thing, are faid to be extrinfic, or extrinfic caufes. Sometimes it implies a thing not being contained within the capacity of another. In which fenfe thofe caufes are faid to be intrinfic, which introduce fomething into a fub- je&t from without: as when fire introduces heat, &c. ‘Sometimes it denotes a thing added, or applied to another. Thus, accidents and adherencies are faid to be extrinfic to the fubjeét; and thus vifion is extrinfic to the object feen. “Extrinsic Argument, Service. See the fubftantives. EXTUBERANTIA, from extubero, to fwell out, in Surgery, tumours fituated under the fkin. EXUBERANCE, compounded of ex and uber, plen- tiful, of uber, udder, in Rhetoric, a redundancy. See Re- DUNDANCE, and PLreonasm. EXUCONTIANI, a branch of Arian heretics. Exovcontit. EXVERRA, in Antiquity, a kind of brufh ufed in cleanfing houfes, out of which a dead perfon had been carried. — EXULCERATIO, from exulcero, to caufe ulcers, in Surgery, an incipient ulceration ; an excoriation, - EXUMA, in Geography, one of the Bahama iflands, fituated on the eaft of the Great Bank, between Stocking ifles on the S.W. and Long ifle on the E. ; about 25 miles long and three broad. Although this ifland is almoit un- inhabited, it is one of the beft of the Bahamas, on account of the fertility of its foil, and the excellence of its anchor- ing ground, in the found to which it gives name. N. lat. 24° 20'. W. long. 74° 30’, Vou. XIV. See Strahan and Prefton, New-fect Squares Londom, bie gs 8 Exuma Sound, a large channel among the Bahama iflands, extending from N.W. to S.E., between Cat ifland or Guanabani to the eaft, and a range of {mall iflands and rocks to the weft and fouth-weit: the entrance is fouth of the ifland of Eleuthera. In this found the whole Britifh navy might ride in fafety. EXUMBILICATIO, from ex, out of, and umbilicus, the navel, in Surgery, a {welling in the fituation of the navel, EXUPERY, St. in Geography, a town of France, in the department of the Correze; fix miles S.E. of Uffel. EXUSTION, of ex, and uro, J burn, the a& of burn- ing with fire; ufed in fome operations by furgeons. See Burn. : EXUVIA, formed from exuere, to put off, to diveft, in Phyfiology, tranfient parts of certain animals, which they put off, or lay down, and affume new ones. Such, efpecially, are the fkins or floughs of ferpents, fhells of lobiters, and the like; which are annually changed, and renewed in the f{pring. The outer integument of the body, which in man and other large animals is fo durably fixed on the body, is in many of the animals of the reptile kind much more loofely fixed, and is changeable feveral times during the period of their lives. ‘The ferpent kind all fhift their fkins feveral times in their lives, and the water-newt has been lately ob- ferved to do the fame ; but no creature in the world docs it fo often as the caterpillar, almoft every fpecies of theie infe&s throwing off their old fkin once in ten or twelve days, or lefs ; and this in fuch amanner as is extreme ly worthy of an attentive obfervation. Malpighi obferved that the com- mon filk-worm changed its {kin four times during its conti- nuance in that ftate; the firit of thefe changes happening at eleven or twelve days from its appearance from the egg, and EYC and the others at the diftance of five or fix days each; and probably the reft of the caterpillar kind obferve nearly the fame periods. Neither is this change of the fin confined to the few creatures we have mentioned ; but among the whole infect clafs, the moft numerous of that of all animated beings we know, there is fcarcely one {pecies, every individual of which does not throw off its fin, once at leaft, before it arrives at its full growth. The term changing the {kin is fearcely expreflive enough for this operation in the caterpillar kinds; for the creature throws off the external covering of every the minuteft part and organ of its body, and the fkins they thus depofit havg fo much the appearance of a complete infe&t, that they are very often miftaken for fuch, prefenting us with every thing that we fee in the external appearance of the living animal. Reaumur, Hift. Inf. vol. i. part 1, ps 225: Exuvia, in Agriculture, the caft-off parts of animals or their coverings, and likewife the fhells and other marine produGions which are met with in the bowels of the earth,: when they have been depofited for a vaft length of time, probably from once living creatures. “lhefe are fometimes called Exrranrous Foffls, but more commonly Re- L1QuiA, which fee. They are of confiderable variety, and differ greatly in their appearances. All fubftances of this nature are capable of much ufe as manures, where they can be procured in {ufficient abundance, efpecially upon all the heavier and more ftiff defcriptions of foil, as they fupply the calcareous principle in fome degree, while they have the effet of rendering them more light and open. EY, in our Old Writers, the fame with infula, an ifland, from which comes eye?, a {mall ifland or iflet, vulgarly called eyght. Hence the names of places ending with ey denote them to-be iflands, as Sheppey, &c. EYACH, in Geography, a river of Germany, in Wur- temberg, which rifes about 4 miles S. of Ebingen, and runs. into the Neckar, three miles above Rothenburg. EYASIORD, a bay onthe N. coaft of Iceland. N.. lat. 65° sol. EYBACH, a town of Germany, in the territory of Nuremberg; five miles S. of Nuremberg. EYBELSTADT, a town of Germany, in the prin-. ipality of Wurzburg ;. three miles $.S.E. of Wurzburg. EYBENS,. a town of France, in the department of the Vere; three miles S. of Grenoble. EYBENSCHITZ, or Ewanics, a town of Moravia,. in the circle of Zuaym, formerly famous for an affemblage of very numerous religious fe&s. The Huffites and Lu- therans worfhipped in the fame church; the Calvinilts had: two churches; the Jews had a fynagogue; befides which there were Anabaptifts, Quakers, Holy Brethren of Switzerland, Photinians, &c. The inhabitants at prefent are chiefly Roman Catholics and Jews; 20 miles N.E. of Znaym. N. lat. 49° 8'. E. long. 16° 17’. EYBENSTOCH, or Eysensrapr, a town of Ger- many, in the circle of Erzgeburg; 20 miles S.S.W. of €hemnitz.. N. lat. 50° 25’. E. long. 12° 35'. EYCHENFLIES, a town of Germany, in the princi- pality of Wurzburg ;. 12 miles S. of Gemunden. EYCK, Huserr Van, in Biography, a painter, born at Maafeyk in 1366.. He is regarded as the founder of the Flemith {chool of painting, the Giotto of Flanders; and exhibited, for that early period of act, great genius and {kill. In concert with his brother Jehn, he was celebrated for many extraordinary and curious works, executed in oil, after the latter had made his difcovery of that mode of painting. % EY € He painted well alfo in diftemper, but gave that up after he adopted the other, One work of his, painted in con- conjunction with John, was preferved in a chapel of ‘the cathedral of Ghent. Sir Jofhua Reynolds faw it there, and fays of it, (fee his Journey to Flanders, ): “it repre- fents the adoration of the lamb taken from the Apocalypfez it contains a great number of figures in a hard manner, but there is great charaGer of truth and nature.in the heads, and the landfcape is well coloured.”” It is now among the fpoils of the French in. the gallery of the Louvre. While it was in Ghent, (at leaft for a time after being wrought, it was held in fuch eftimation as to be fhut up from public view, except on feltivals; and at other times was only fhewn to ambafladors or princes them- felves who defired to fee it. Philip I. of Spain withed to purchafe it; but that not being practicable, he employed Michael Coxis to copy it, who {pent two whole years about it, and received four thoufand florins for his labour from the king, who placed it in the Efcurial. This artift died in 1426; aged 60. Eyck, Joun Van, younger brother to Hubert, was born at Maafeyk in 1370, and fludied with his brother, though in the end he excelled him. ‘ ‘To him the world is indebted for the firft ufe of oil im painting, which he difcovered in the year 14.0. Painters before this wrought their works in diftem- per, (fee Distemper,) and then to fecure them from the action of air and dampnefs, they were accuftomed to yarnifh them ; with what compofition it does not appear. WVafan (Part 2, page 213, ed. 1681,) relates that Giovanni di Bruggia (fo he calls him,) ‘“ had painted a pi€ture in the ufual way, and having varnifhed’ it, fet it to dry in the fun’s rays, as was cuftomary; but either from the wood being ill feafoned and ill put together, or from the extreme’ violence of the heat, the piéture was cracked and quite fpoiled.. He therefore deliberated how he fhould in future beft prevent accidents of this nature happening to his works, and endeavoured to make a varnifh which would dry in* the fhade, without the neceffity of expofing it to the fun. «¢ After many experiments, he found at latt that oil of lin- feed and of nuts, were more ficcative than any others he had’ tried. Thefe, when boiled with other ingredients, made the varnifh fo much wifhed for by him and other painters.. He afterwards difcovered that mixing thefe oils with his colours gave them a hardnefs, and in drying not only equal- led the water colour, but gave them more brilliancy and force: and that, without the neceffity of varnifhing aftere wards :. and he was furprifed to find alfo, that they united far better in oil than in water.”? The fame of his difcovery foon fpread over Flanders and into Italy, and when he grew old, but not till then, he im- parted his fecret to feveral painters, both Flemifh and. Italian. And.it muft be confeffed the art of painting is very highly indebted to him for this foundation of the- wonderful fuccefs with which fucceedingages have profited by this very ufeful difcovery. pemee As a painter he poflefled very good talents, confidering the early period of the art. He copied his heads generally from nature ; his figures are feldom well compofed or drawn... But his power of producing richnefs of politive colours is furprifing, and their durability no lefs fo. He paid great attention. evidently to nature,. but. faw her in an inferior” flyle. He laboured his pictures very highly, porkeiedy in the ornaments which he beftowed with a lavifh-hand, but with all the Gothic talte of the time and country in which. he lived. In the gallery of the Louvre is a picture of the §* Divine Being,” as he chofe to call it, re-. prefeated. . EYE prefented by an aged man with a long beard, crowned with the pope’s tiara, feated in a chair with golden dircles of Latin inferiptions round his head, but without the leaft dignity of eharaGer, or evident action or intention. It is the very bathos of the art. At the earl of Pembroke’s, at Wilton Houfe, is a fmall pi&ure which does him more credit. It reprefents the nativity of our Saviour, with the, adoration of the fhepherds, and the compolition confifts of four figures, befides the Saviour and four angels, and has in the back ground the anomaly of the angels at the fame time appearing to the fhepherds. It is in oil, and the colours are moft of them very pure, except thofe of the flefh. The garment of Jofeph is very rich, being glazed (fee Grazine, in Painsing,) thick with red lake, which is as frefh as if it were new. Almoft all the draperies are fo glazed with different colours, and are {ill very clear, except the virgia’s, which, inficad of maintaining its blue colour, is become a blackifh green. ‘There is a want of har- mony in the work, but it is more the effe& of bad arrange- ment. of the colours than the tones of them. The lory furrounding the heads of the virgin and child is of gold. We have been the more particular in flating thefe circum- ftances of this picture, becaufe our readers will naturally be curious to know how far the original inventor of oil painting fweeeeded in his procefs, and they will fee by this account that he went very far indeed, in what relates to the perfediion of the vehicle he ufed, which, if he had happily been able to employ as well as he underitood, the world would not have feen many better painters. He lived to practife his difcovery for 31 years, dying in 1441, at the advanced age of 71. F EYDY ENGLY, in Geography, a town of Hindooftan, in Vifiapour; 14 miles S. of Galgala. EYE, in Anatomy and Phyficlogy, the organ of vifion. The eye-ball is the immediate agent in refracting the rays of light, and in colle&ting them into one point, fo as to form an image of the object from which they are refleéted. Fer this purpofe we find in it a feries of perfectly tranfparent parts, which execute the various refractions 3 a nervous pulp, on which the rays of light thus refra&ted make an impreffion to be conveyed to the fenforium by the optic nerve; and sertain membranous opayne coverings, containing the above- mentioned parts, and fupporting them in their relative fitua- tions. The vifual organ, fimple, when thus confidered, be- comes much more complicated, if we include in our de“ nition all the apparatus added for the purpofes of proteétion or affiftance. The mufcles which move the globe in various direétions, the eye-lids, which cover and protect it in front, and the parts which fecrete the tears, and convey them into the cavity of the noftril, are all fo intimately conne&ted in fitvation and function with the globe, that a regard to na- tural arrangement leads us to include them in the fame arti- cle; in which we hall confider, firft, the anatomy of the whole apparatus, and afterwards the phyfiology of vifion. The eyes are two in number, exactly fymmetrical, placed in two bony cavities, called orbits, which are fituated under the forehead, and feparated from each other by the nofe, The detailed defcription of the orbits will be found under the article Crantum. The figure of thete cavities is that of a pyratnid with four unequal fides, directed obliquely forwards, and outwards from the point to the bafe. The fize varies but little in different individuals, and is ufually independent of general flature. It exceeds confiderably that of the globe, which is fupported by much fat and other foft parts, fo that it can be moved with great quicknefs and facility in every direGtion. The globe of the eye is Situated in the anterior part of the EYE orbit, nearer to the internal than the external fide of the cavity, and is more or lefs prominent in different individuals. The bafe of the orbit being truncated obliquely, the eye projects beyond its edge on the external fide, while it appears more deeply buried towards the nofe. It is fupported in front by the moveable eye-lids; on the other fides by its mufcles, which, as well the nerves and blood-veffels of the organ, are enveloped ina foft fat, filling the reft of the orbit, and keeping the eye on a level with the face. In the ema- ciation confequent on age or difeafe, this fat is abforbed, the eye lofes its prominent fituation, and finks much deeper in the orbit ; hence the angular edges of the bony cavity are rendered more evident, and the charaéter of the face undergoes a marked alteration. The fize of the eye varies but little in different fubjeGis ; its apparent varieties depending in great meafure on the larger or fmaller opening formed by the eye-lids, It is {maller in the female than in the male, and proportionally larger in the infant than in the adult. The fexual and na- tional differences in the external proportions of the eye will be more minutely confidered in the explanation of the plates, . which follows the anatomical defcription. The figure of the eye reprefents two portions of diftin® fpheres, of different diameters, united towards the front. The feétion of the {maller {phere is tranfparent, and occu- pies about the anterior fifth of the globe, projeGting from the larger {phere, which is opaque. By this difpofition, the axis of the eye exceeds its tran{verfe diameter in a {mall ratio, ot which we fhall have occafion to {peak more minutely hereafter. The axes of the globe and the orbit are not the fame; that of the latter is directed obliquely outwards, fo that, if prolonged behind the apex of the pyramid, it would meet its fellow within the cranium: the axes of the two eyes are parallel, and point directly forwards. The ftrong cylindri- cal chord, made up of the optic nerve and its firm inveftmente, enters the orbit in the direction of tlie axis of the latter, and is attached towards the inner fide of the pofterior furface of the globe. The globe or ball of the eye is compofed of corcentric membranous coats or tunics, invefting tranfparent parts of different denfities, ufually called Aumours. The external covering, which gives the figure to the eye, is firm and thick, formed of two diitin@ portions ; the anterior, which is tranfparent, is called the cornea ; the pofterior, opaque and white, the /c/erotica. A certain portion of the front of the globe is covered by a membrane, which conneéts the bail to the lids, and is called the conjun@iva. The inner furface of the latter is lined by a thin opaque membrane, of delicate ftru€ture, covered on both fides by a dark coloured pigment, and called the choroides : this is plaited on the inner furface of its anterior part into projecting folds, the ciliary proceffes, and it is connected by its front edge with another membrane, . the iris, which floats tranfverfely at a fmall diftance from the cornea, and has a circular opening about its middle, termed the pupi/. The retina, a foft tranfparent expantion, commencing from the optic nerve, and nearly equalling the choroides in extent, lines the inner furface of that membrane. This embraces by its whole internal furfacé a pellucid body, occupying the greateft portion of the globe, and named the vitreous humour, In front of this, and partly imbedded in it, is placed the chry/lalline lens or humour, another tran{parent body, nearly {pherical in fhape, and of greater comparative denfity. The {pace left between the latter and the cornea, is divided partially by the iris, and filled with a clear watery fluid, named the agucous humour. The rays of light pafs through the tranfparent cornea, the aqueeus humour, the B2 openiag Biv ee opening in the iris or pupil; the chryftalline lens, and vitreous humour, undergoing various refractions in their paffage, and are finally colle&ted fo as to form an image on fome part of the concave furface of the retina, from which the impreffion is conveyed to the ferforium. The pee or membranes of the eye. — The /elerotic coat (die tffe haut, Germ. ) extends from the entrance of the optic nerve to the curnea, covering about four-fifths of tne globe, and truncated in front for the reception of the cornea. The external furface is covered behind and in the middle by the mufeles of the eye and the furrounding fat, and in front by the conjunstiva. The inner furface, connected with the choroid by a delicate cellular fubitance, by blood-veffels and nerves, is ufually tinged of a dufky colour by the pigment of that membrane ; an effe& produced after death by tranfuda- tion, fince the ftain is not vifible in an eye examined in its moft recent ftate. ‘his furface is pierced by numerous {mall lobes, ‘particularly about the entrance of the optic nerve, apd near the origin of the cornea, by which arteries enter dire@ly into the choroid coat; the openings are lefs numerous towards the middle, and give paflage to veins, and to many fmall nerves which run through the {clerotica obliquely, for two or three lines, and lie in fuperficial fur- rows ofits inner furface in their way to the ciliary circle and iris. he fclerotica prefents in front an aperture nearly circular, of which the tranfverfe is rather longer than the perpendicular diameter. The inner edge of this opening is bevelled off, and the outer paffes over the oppofite floping edge of the cornea, which is thus fet in the iclerotica. A {mall round opening, appearing on the infide as a circular {pot, pierced by numerous {mall holes, is placed nearly in the centre of the pofterior and thickeft portion of the tunic, and tranfmits the medullary part of the optic nerve. This is equi-diftant from the upper and lower parts, but nearer‘ to the inner or nafal, than to the outer or temporal fides of the globe. It grows gradually {maller from its commencement at the outer, to its termination on the inner furface of the {clerotica, the nerve diminifhing in diameter in the fame pro- portion in this part of its courfe. ; mut The {clerotica is of a white colour. It is nearly a line in thicknefs at the back of the globe, but becomes confiderably thinner at the front. Its thinneft part is near the infertion of the tendons of the re&ti, which is rather beyond the middle. Next to the cornea it becomes again flightly thicker. Its ftruGture is firm and denfe, confilting of itrata of fibres run- ning parallel to and decuffating each other in every direction, fo as to complete a {trong fibrous membrane, not feparable into layers, at leaft not in the adult, even after very long maceration. In the foetus it may be divided into two lamine throughout its whole extent, the union between them not being very firm. In this inftance the external layer appears diftin@, and totally independent of the fheath of the optic nerve. The thin internal layer is manifeftly continued from the fine membrane immediately invefting the nerve. The difpute, whether the firm fheath of the optic nerve derived from the dura mater expands as it reaches the bulb, and conftitutes the {clerotica, is a point of little moment. The _Aheath and the fclerotica are evidently united moft intimately, if the membrane is not continuous. Zinn defcribes the outer layer of the vagina of the optic nerve as colleéing, before it arrives at the fclerotica, into numerous denfe, fhin- ing, firm fibres, which are inferted into the pofterior, thick, prominent edge of that tunic, where it is pierced by the medullary part of the nerve. The inner layer, thicker than the external, pafles deeper between the nerve and the fcle- rotica, on the inner furface of which it gradually difappears. The difference between the fclerotica and the fheath of the nerve is marked by the fudden increafe of thicknefs in the former, by its white colour, and by its denfe ftru€ture, com. pofed of bres interlacing each other, the fheath of the nerve being thin, and of loofer texture. The brilliant white colour of that portion of the f{elerotica covered by the conjun@iva, has been attributed to a pecu- liar membrane, to which the name of tunica albuginea has been given; and it has been fuppofed that this coat was formed by the union of the tendons which terminate in front the four ftraight mufcles of the eye; but thefe tendons are not extended to the cornea, are not broad enough to unite y their edges, and are always diftinét from each other, and the intervals between them are of equal brightneis with the parts covered by the tendons. No fuch tunie in reality exilts ; the {clerotica fhining advantageoufly through the io tran{parent conjunctiva is the only caule of the brilliaacy and whitenels. _ the outer canthus. %*, the root of the nofe. From this it appears how nearly the eyes are on a level with its edge, differing much ta this refpect from the European. In reviewing the principal differences between the eyes of the Negro and European, we obferve, that in the former the eye-brow is thin, and projeéts but little over the eye lid, fo as to throw but little fhade on the eye; the hairs are not woolly, but nearly as ftraight as in the European. The eye-lids are thicker, and denfer in their texture, and tumid, fo as to give the eye the appearance of being buried more deeply inthe fkin of the face. Hence many rays, which would fall on the globe at {mall or acute angles, are avert- ed from it ; and the light can affect the eye but little when the lids are clofed. The lower lid 1s broader and more moveable, covering a greater portion of the eye. The opening of the lids is narro er; their margins are tumid, and the outer edge rounded. The eye-lathes are more curved, and thicker ; and are fo extremely fine and black, as to exclude many rays of light. The conjunctiva is not fo white, and the fold at the inner canthus is broader. ‘The cornea appears fmaller, and not fo convex ; the bulb itfelf larger. The almoft uniformly dark colour of the iris is fo intenfe, that, when viewed at a little diftance, we can fcarcely diftinguifh it from the pupil, the whole appearing as a dark fpot. This much diminifhes its brightnefs. The preceding faéts lead us to conclude that the eye of the Ne- ro can bear more light, and is better fuited toan African Y> than that of the European, who enjoys, perhaps, a larger field of vilion, from the direction of his orbits. The differences are not equally obfervable in all individuals of the two races. Fig. 4.—The left eye of a young white negrefs (Leuce- thiopiffa, or Albinefs) is here reprefented. The character of the female eye is ftrongly marked : thefe figures ; which however differ remarkably from the preceding ones of the male fubject, as well as from thofe of the European female, The eye-brow is foft, of a yellowifh or pale white colour, and ftraight, with the hairs fcattered. The lids are puffed, and pof- fefs rather the colour of chalk than of flefh; and the flcin is- {caly inftead of being f{mooth. The upper lid appears comparatively very narrow. ‘The opening of the eye-lids is narrow, particularly when the light is at all trong, The eye-lafhes are delicate and much curved, efpecially in the lower lid, where they are exceffively clofe; they are of a pale white. The caruncle is not fo red ; the cornea more convex. The iris, formed of thin, delicate, reticulated fibres, appears of a pinkifh white co- lour, and fo tranfparent, that between the fibres we can fee the rofe colour of the bottom of the eye ; in other words it fhines through the iris. The iris itfelf isin an almoft con- {tant ftate of tremulous motion. Fig. 5.—The eye of an adult female, drawn in a ftate of tranquil fleep. abc, &c. the eye-brow; ode f, the upper eye-lid, fmooth and ftretched the eye-lathes, decuffating each other. /} i, a line drawn horizontally, fhewing the external can- thus to be the lowett. £/, the fituation of the iris, or rather of the cornea, pro- jecting under the lid. mno, cutaneous veins, fhining through the delicate ficin. g> the fold of the lower lid. In the fide view of the fame eye, a, &c. denote part of the forehead; 4, the root of the nofe; c, the eye- brow ; d to g, the upper lid; &, the middle part, which is folded when the eye-lids are opened. The projection of the cornea is evident in this view. The other letters point out the fame parts as in the former figure. In the ftate of quiet fleep the eye-lids are gently clofed ;. the upper one fmooth and unwrinkled, defcends lower on the outer than on the inner fide, and hangs as it were obliquely. The caufe of this difference is in the ftru€ture of the two angles; the upper lid having but little motion at the inner angle, on account of the tendon of the orbicu- laris rufcle, while it defcends freely at the external canthus. The bulb of the eye is fomewhat turned upwards, as we may obferve in drowfy perfons; fo that when the eye is fhut, the cornea, with the greateft part of the globe, is covered by the upper lid alone. This fituation of the eye-- ball is very manifeft in children when afleep ; the cornea in them fhiving through the thin eye-lid, appearing 2s a dark {pot, and its convexity being vilible when viewed from the fide. The lower lid generally retains its fold. The differ- ence in the angular form of the two canthi is ftill obvious. The eye-lathes decuflate each other ; and, if the eye be na- turally prominent, the cutaneous veins are feen feattered over the upper lid. > 8? Prare II. The figures in this plate illuftrate the ftru€ture of the eye-lids and of the lacrymal apparatus. . Fig. 1.—Exhibits the orbicularis mufcle of the left eye in the adult. ab, the opening of the eye-lids clofed; c, the tendon, which joins the eye-lids at the internal canthus, and is fixed into the nafal procefs of the fuperior maxillary bone; d, mu({cular fibres attached to the bones ; ¢, f, fibres intermixed with thofe of the corrugator fupercilii and frontalis; g, delicate bundles of fibres covering the upper lid; 4, fibres ; covering EB YE covering the lower lid, joining the preceding at the outer angle; 4, ftronger fibres attached to the bone, and the tendon ; i, fibres pafling towards the nofe ; /, m, thin Hbres towards the temple ; m, 2, {trips of mufcle going over the cheek ; 0, 0, fcattered fibres at the very outer a p> p> clofe fibres immediately furrounding the edge of the eye- lids, called by Albinus “ mufculus ciliaris,’? fig. 2.—The eye-lids opened widely, and the margins turned out a little, a, the eye-brow; 4, the fold of the upper lid; c, the openings remaining after having pulled out the eye-lathes ; d, the punétum lacrymale ; ¢, the upper edge of the inter- nal canthus; f, the orifices of the febaceous glands ; g, the union of the two eye-lids, externally ; 4, the caruncle ; 4, the femi-lunar fold of the conjunétiva; 4, the fold of the lower lid; /, the openings after having pulled out the eye-lathes ; m, the punétum lacrymale ; x, the lower erus of the inner canthus ; a, the mouths of the febaeeous duéts. The marks left by the cilia are far more numerous in the upper than in the under eye-lid, as well as larger. The openings of the febaceous glands are placed in a curved line, and rather nearer to the inner edges of the tarfi, The puncta lacrymalia, or openings of lacrymal ducts, are much larger, and placed in a fmall papilla. Figs. 3, and 4.—A long and fhort hair taken from the eye-brow, magnified to four times their natural fizes; a, the bulb, buried in the fkin, which becomes thinner at 4 ; and is continued fwelling, cylindrical, and curved, c ; and ter- minates in a fine point d. Figs. 5, and 6.—Two hairs trom the eye-lafhes, magni- fied. They begin alfo.in a fmall bulb, @; diminifh in fize confiderably at &; become gradually thicker, c; are thickeft about their middle, d; again decreafe in a conical form, ¢; and end in avery fine point, f. Thefe figures oint out the differences in the fhape of the hairs of the eye- pee and the lathes, or cilia. Fig. 7.—The eye-lids of the right eye, moderately open, feen from behind, with the lacrymal gland turned a little forwards, covered at its anterior point by the conjunc- tiva, a, a portion of the orbicularis palpebrarum, on its inner fur- face; 4, the chink between the lids; c, the lacrymal gland, on its lower fide ; d, its divifion into two principal lobes; e, its “excretory duéts ; f, the openings of thefe duéts in the con- janctiva; g, the conjun¢tiva, lining the internal furface of the eye-lids ; the part which appears folded has been turned off ‘from the bulb ; 4, the febaceous glands of the upper hd, fhining through the conjunétiva; , the fuperior punétum lacrymale ; 4, the glands of the lower eye-lid; /, its punétum lacrymale, or mouth of the lacrymal Mar m, the carun- enla; 2, the femi-lunar fold of the conjunctiva. This is drawn back a little by the other folds of the membrane ; its natural fituation would be at /. { Fig. 8 —The internal or pofterior fnrface of the eye lids, to thew the ftruéture of the febaceous glands, ‘The figure is magnified to twice its natural fize, which may be feen by comparing it with the preceding one. a, the orbicularis palpebrarum ; 4, the opening of the eye-lids, through which the cilia of the upper lid are dif- cernible; ¢, the levator palpebre fuperioris ;_f, the openings of the excretory duéts of the lacrymal gland; s, the con- jundtiva; 4, the febaceous glands fhining through it; 7, the portion of the conjunétiva refleGted, and the glands expofed ; &, the openings of thefe glands; /, the febaceous glands of the lower lid wholly expofed, fo as to fhew their difpofition in rows made up of {mall bunches united with each other. Fig. 9.—This may be confidered as the reverfed appeare ance of fig.2. The true relative fituation of the lacry- mal gland, and of the lacrymal duéts, is particularly pointed out. ab,cd, the upper and lower lacrymal cemals as con- tained in the eye-lids ; a, a, the openings or punta lacry- malia; 4, 4, the blind pouches formed by each; c c, the continuation of the canals ; d, d, their openings in the lacry- mal fac; e fg, the lacrymal fac; ¢, the blind finus at its upper end ; g, its termination below inthe nafal part of the lacrymal canal; 4 i, the termination of the du@ in the noftril. Fig. 10.—The lacrymal dué& on the left fide, viewed from the fide next the nofe, to give an idea of its diretion, breadth, and of the opening in the noftril. It will be feen to be much wider on this, the internal, than on the anterior fide, - ab,the palpebral portion ; c d, the lacrymal fac; ¢ f; the nafal portion ; f, the natural appearance of its opening in the nofe, not difturbed by the introduction of any inftru- ment. Fig. 11.—The lacrymal canal laid open, and halved, to fhew its internal capacity, its thicknefs, and its ftruéture. abc d, asinthe preceding figure; d, a doubling, or fold of the internal men\brane, which marks the end of the lacrymal fac; ef g, thd nafal portion of the duct; fia fold in the inner membrane, fometimes obfervable ; 4, mu- cous follicles, or crypte, which may be feen fcattered up and down the membrane, efpecially after a fuccefsful in- jection. Prate III. The figures of this plate exhibit the mufcles of the globe, and the nerves belonging to them; together with the more intimate ftructure ef the globe itfelf. fig. 1.—The mufcles of the bulb of the left eye; with the levator of the upper lid,-in their relative: fituation to each other, and to the bony orbit in which they lie. I 2 3, the out-line of the left orbit; 1 3, the internal ; 1 2, the external fide; 3 2, the inferior margin; 4, the cartilaginous pulley for the tendon of the obliquus fuperior ; 5, the bulb of the eye; 6 7, the optic nerve; 6, the part which lies on the fella turcica ; 7, the part which enters the orbit. a—e, the levator palpebre fuperioris ; a, its pofterior tendinous extremity, adhering to the dura mater at the upper margin of the foramen opticum ; 4, its conneGtion with the rectus fuperior; c d, its mufcular part; ¢, its anterior tendinous end at the margin of the upper lid. fg, the reétus fuperior, almoft wholly covered by the levator palpebrz. hi k, the re€tus externus; /, the anterior attachment of the obliquus inferior; m, the reétus inferior; n 0, rectus internus ; p—s, obliquus fuperior; g r, its flefhy fibres, arifing partly from the tendon, p; partly from the orbit ; and terminating in the tendon, ss, which pafles through the pulley 4, and {preads over the bulb. Fig. 2.—The fame parts; the levator palpebra, reGtus and obliquus fuperior, optic nerve, and globe of the eye having been removed. a bc, the re&tus internus; d e .f, re€tus inferior ; g 4 i rectus externus : itis {plit at its pofterior tendinous end, g, to allow of the paflage of nerves; 4 / m, the obliquus luferior ; &, its attachment to the periofteum of the fuperior maxillary bone. Fig. 3.—The trunks of all the nerves belonging to the eye, in their relations to the cranium, the orbit, the mufcles, and the other parts of this organ. As this figure, exclu- fively of the nerves and lacrymal gland, is prtailily the wi EY £. with fiz. 1, the letters of reference to the mufcles are entirely omitted, to prevent obfcurity. 2, the optic nerve; its final diftribution will be feen helow ; 3, the third nerve of the brain or motor oculi; 4, the fourth nerve, or trochlearis; 5, the nfth nerve; A the coutraéted portion next the brain, which {wells confiderably at B; C, the firlt branch of the fifth entering the orbit; D, the fecond branch which paffes through the foramen yotundum G; E, the third branch, which enters the foramen ovale F I. The rrft branch of the fifth, after giving off a flament, a, which joins the fourth, divides into the ramus frontalis fei, and the nervus lacrymalis, 4. ‘The ramus frontalis fends a {mall twig, c, to the neighbourhood of the trochlea ; another, d, which’ joms the nervus infra trochlearis, The proper frontal branch, e, is f{tretched over the levator palpebra fuperioris, without fending any twig to it, aud is diftributed over the forehead 4 4 ; i:—é, the lacrymal nerve, ‘the branchesof which feparating and re-uniting, may be divided inco two principal parts, an internal, /, and an external, m. The inner branch, communicating with the external, 2 0, goes towards the lacryma! gland, in which it is partly diftributed, a few filaments running on in conjunction with -fome from the external branch r, to the orbicularis, and fkin of the upper lid, ss. The external branch is fcattered in the fubftance of the lacrymal gland, and communicates by different filaments with the inner branch, ws with the third branch of the fifth, vp; and is tnally loft on the upper lid; y, a fmall twig which enters the orbit from the facial verve. 6 6 6, the fixth nerve of the brain, fifth, as far as D, entering the orbit with it. buted on the reétus externus. Fig. 4.—This figure exhibits more particularly the diftri- bution of the third nerve, and the ftruéture of the lenticular, or ophthalmic ganglion. It correfponds with figs. 1, and 3, the fourth, and moft of the branches of the fifth are re- moved. The levator palpebrea and reétus fuperior are turned a little afide. A A, the rectus fuperior turned off, fo as to exhibit a art of its lower furface; B B, the levator palpebre in the pik fituation, 3 a, &c. the third nerye. At its very entrance into the orbit, a {mall branch, 2, is feen going off, which is joined by a finall filament from the firft branch of the fifth, u, and then divides into a branch for the levator palpebra, d, and another, ¢, for the rectus fuperior ; e, the greater branch, _ pailes under the optic nerve on the outer fide of the latter. It _divides into an inner twig for the rectus internus ; a middle one, fs for the. reétus inferior; and an inferior, g, which again {ubdiyides a fhort but rather thick portion, A, joming the ophthalmic ganglion, and a longer, and thinner, 74, pafling to the obliquus inferior. From the ephthalmic ganglion two fafciculi of the ciliary nerves proceed. The {maller and fuperior fafciculus {plits into three tlaments, é, 4, £, which purfue a ferpentine courfe near that of the optie nerve, dividing into fix or more unegual portions, /, 1,1; three of thefe may be feen enter- ing the fclerotica, The inferior fafciculus, rather the largeft, generally divides into fix tlaments, two only of which, m, m, are here apparent. 5, the ffth nerve ; 2, the frft branch of this nerve ; four ‘of its twigs are cut off; e correfponds to a in fig. 33 p “to 43g to e3 r to £3 s, a ‘fth twig from this nerve, a Ge It is covered by the It is diftri- _dividing, into a nafal-twig, ¢, which is cut off, into another, _ My communicating with that twig of the third which goes to the rectus fuperior; and inta a fmall filament which joins the ophthalmic ganglion. 6w, the fixth nerve, or abduor, paffing to the reCtus externus at ww. The remaining figures reprefent minutely the ftru€ture of the globe of the eye. Fig. 5.—The anterior half of the left eye, after the organs had been divided perpendicularly ; the other half forms fig..6; a, the cut furface of the fclerotica, of nearly uniform thicknefs all round; 2, the dark-coloured fubftance between the {clerotica and choroidea; c, the tunica cho- roidea, appearing in folds from being cut; it is really {pread uniformly {mooth over the retina; d, the pigmentum nigrum, between the choroidea and retina; ee ff, the retina; ee, its cut margin, folded and turned in; ff, its anterior termination, feen more diftintly in figs. 7, 9,10; fg h, the ciliary body, fhining through the remains of the vitreous humour. From the great quantity of pigment covering it, its folds can be feen diftin&tly only towards the margin of the chryftalline lens. It is manifeftly not covered by the retina ; 4, the {pace between the ciliary proceffes and the lens, fhewn by zz in fig. 7; ik/, the chryttalline lens, included in its capfule, feen through part ef the vitreous humour ; i &, the iris, broadeft at the outer fide; /, the upil. Fig.6.—The pofterior half of the preceding fetion ; abed, asin the foregoing figure ; e—#, the retina, on its inner furface; the margin e f much wrinkled ; /, the round fpot, fhewing the entrance of the optic nerve; ¢ 4i, branches of the central artery, and vein of the retina, filled with blood; 4,1, two branches, which furround in a circle the foramen centrale, or centre of the retina; 4, edged by a yellow ring, concealed in this view by the folds of the retina, Fig. 7.—The lower half of the eye-ball divided hori- zontally, or at right-angles to the fection exhibited in the two preceding figures. Its axis lies between the points 3, @. a—d6, the {clerotica; 4, its thinneft part, under the tendons of the reCti mufcles; c¢, its middle portion, thicker; d, its thickeft part, united with the fheath of the optic nerve ; 6, an hemifpherical rifing in the fclerotica, pierced by holes, through which the medulla of the optic nerve paffes, to be expanded in the retina; o—r, the iris; s, its pofterior furface, covered by pigmentum nigrum ; ww w, the retina; w, its anterior margin, or termination; qw, its in- ternal furface, feen through the vitreous humour; 1 2—8, the optic nerve divided; 45, the fheath of the nerve, con- fitting of two lamiaz ; 8, marks of the central veffels of the retina perforating the optic nerve. ‘The nerve diminifhes very much in fize at 6. Fig. 8.—The pofterior furface of the retina of the left eye, drawn from behind; the true centre of the retina falling exaétly in the middle of the figure. a, the retina fpread over the vitreous humour, fo placed as to fuit the pofition of fy. 5; 4, the foramen centrale; c, the yellow ring furroundmg it; def, the place where the optic nerve perforates the fclerotica, the fituation of the central yeflels of the retina, improperly fo called; g; 4, i, three principal branches of thefe veffels, filled with blood. Fig.g—A view of the retina and vitreous body, with the lens, feen from the front; it is the reverfe of the preceding figure, exhibiting the anterior limits of the retina, the {pace between it and the lens, the anterior furface of the latter, and the foramen centrale, feea through the chryttal- line and vitreous bodies. : ab, the retina; 446, its termination in front; ¢$, the corona ciliaris, formed by the membrana hyaloidea round the iY the edge of the lens, correfponding to the ciliary procefles; cede, thelens; d, the foramen centrale; ¢,e, veflels of the yetina. Fig. 10.—The outer furface of the retina in the left eye; @a, its anterior margin ; 4, its central foramen; 4, i, blood- veffels furrounding the latter; cd, the optic nerve, deprived of its inveltments; ef, the corona ciliaris, not covered by the retina; ef, the diftance of the ciliary body from the dens; g, remains of pigmentum nigrum; £/, the lens; 4, the part projecting above the corona ciliaris. Fig. 11e—The choroid coat of the left eye with the veflels injeGted ; {een on the fide towards the nofe. ab, the optic nerve ; c—f, the remaining part of the f{cle- rotica 3; g—w, the tunica choroidea; ghim, the annulus gangliformis ; m, the internal long ciliary artery; n, the internal long ciliary veins 0, the internal long ciliary nerve; psp» the long and fhort arteries of the choroid; g,q, the cillary nerves; r, a trunk of the vena vorticofa fuperior; s, a trunk of the vena vorticofa inferior ; ¢, another of the fame; g 4, the margin which marks its feparation from the iris. fig. 12.—The anterior furface of the choroid, and iris of the left eye, being a front view of the preceding figure. abc, tunica choroides; 4c, the annulus; d—=s; the iris ; dh, the margin conneéted with the choroides; de, the outer or larger ring; ¢f, the inner or leffer ring of the iris; g, the pupil; df, the narrow fide of the iris next the nofe; g/, the broader fide towards the temple; 7, a, ciliary nerves, forming plexufes on the annulus; 7, the external long ciliary artery ; s, the internal long ciliary artery. fig. 13.—A view of the chryftalline lens of a child newly born, fhewing its rounded form.. Fig. 14.—The lens of a child of fix years old, increafed fn circumference, not in thicknefs. Fig, 15,—A fide view of the lens of an adult. The dif- ference between the anterior and pofterior fegments is lefs than in either of the preceding.. Prare IV. . Mig.1.—A fegment of the choroides and iris-of a new- born child, feen on its internal furface, magnified twenty- five times. The velflels are filled with injection. a, the true fize of this fegment ; —g, the part belonging to the iris; dc, the margin of the pupil; fg, the margin next to the circumference of the cornea; 4—e, part of the lefler ring of the iris; 4, 4, trunks of blood-veffels fupplying this net-work ; d—g, part of the greater or outer ring. The difference in the diftribution of the veflels on’ thefe parts is’ very evident ; i,4,/, three larger arteries arifing from the circle formed. by the long ciliary veflels round the iris; m—s, a fegment of the corpus ciliare; n,0,p, three entire plice or folds; m, g» two fegments of ‘folds; ¢v, the projecting margin of the fold, which dips into a correfponding depreffion in the vitreous body ; w cw, a deeper part of the margin, where the plice join each other; rsx y, a ftriated part of the choroides between the ciliary body or procefles, and the anterior margin of the retina, feen in Plate II. fig. 5 ; xy v1, part of the choroid cor- refponding-to the retina; xy, that oppofite the termination otf the retina; 2—8, trunks of the ven vorticofe. Wig. 2.—The anterior part of. the choroides, with the iris, and membrana pupillaris, in a foetus of feven months, magnified quadruply, and the veflels filled with injeGion, A, the true fize of this fegment.; a 4, the proper choroid of the bulb; ¢, the annulus gangliformis; cd, the iris; de, the membrana pupillaris, its veflels continuous with thofe of the iris; _f, the long internal ciliary artery ; g, the long ex- ternal artery. Thefe arteries, by their divifions, form a ring round the iris ; 15, five venous vortices in the choroid. Tig. 3.—The pofterior part of the chryftalline lens, en- clofed in its capfule, froma foetus of feven months, with the veflels injected, magnitied to four times its natural fize. A, the true fize of the lens; 4, a blood-veffel from the central artery of the retina, which has pafled through the middle of the vitreous humour, and is {cattered over the cap- fule. Figs. 4.and 5.—Views of the left eye, after a plane per- pendicular feétion pafling antero-pofteriorly through the orbit, and the parts it contains, dividing them into two equal portions, an internal and external, the former of which is here reprefented. Every part is feen in its natural fituation, nothing having been dilturbed or removed. ‘The explanations are given in the following plate, where the figure is magnified to three times its natural diameter, in order to avoid confufion, and exprefs the obje&s more dif. tintly. In fig. 4. the eye is fhut; im fg. 5. ic is open. Some parts alfo which were exhibited in fy. 4. having been removed, othersare brought into view in jig. 5. In fig. 5. we obferve the fold of the upper lid, and the cart age paffing under the fold back into the orbit. The retina and lens being removed, the choroid is brought into view, with its ciliary procefles, venz’ vorticofe, and long internal ci- liary artery. It fhews alfo the fituation of the central ar-- tery of the retina. Pirate V. A magnified outline of fig. 4. of the preceding plate. As this isa moft important view, the references are given very fully. The words ‘ cut furface of” fhould be under- {tood throughout :. they are omitted to avoid -the- tedious repetition of the fame phrafe. j A—Q, the bony orbit; A—H, the upper plate of the: orbit ; A B, the fmooth furface towards theeye; CC GH, the convex furface, uneven, correfpording to the brain; - ADEF, the frontal part of the os frontis;.C CG, the orbital part of the os frontis; E E, the medullary cells of the frontal part; F, the left frontal finus; F F, the me- dullary cells of the orbital part; G, the future between : the frontal and {phenoidal bones; G BH, a part of the upper or leffer ala of the {phenoidal bone, which forms the upper part of the canal for the optic nerve ; Q—M, the in- ferior plate of the orbit; II, the fuperior maxilla; K L, the orbital fiffure occupied by tendinous fibres, fat, veffels, and nerves; M, part of the leffer ala of the {phenoidal bone, forming the lower part of the foramen opticum ; L, the periofteum ; BHM, the canal inthe ala minor of the {phenoidal bone for the optic nerve, or foramen opticum ; N, the periofteum of the frontal bone ; O, a continuation of the periofteum towards the upper lid, forming.a kind of ligamentous arch, the ligament of the fuperior tarfus ; P, the periofteum of the fuperior maxilla; Q, a continuation of this periofteum, towards the lower lid, in the form of an arch, the ligament of the inferior tarfus; ++, the axis of the orbit; R—V, the dura mater; R, the exter- nal, S, the internal Jayer; TU V, the place where the dura mater is united partly with the periofteum of the orbit T, partly with the fheath of the optic nerve U, partly with the origin of the levator palpebre 1, and the rectus fuperior 43 W—Z, the forehead ; W, the thicknefs of the fkin of the forehead ;.X, the fat between the ‘kin and the frontalis; Y, the frontalis; Z, the fat bétween the frontalis and the periofteum of the frontal bone. a~d, the brow, or fupercilium, .a, corrugator fuperi- 7 Clik 5 > rte, ellii ; 4, mouth of the frontal vein ; ¢, mouth of the fron- tal artery ; d, hairs of the eye-brow; e—w, the upper eye-lid; ¢, fkin; f, fat between the {kin and orbicularis, gradually eg ages towards the eye 3 > orbicularis pal- pebrarum ; 4, fat beneath the orbicularis, terminating in a thin edge below ; i, the tendon of the levator palpebre: fuperioris ; 4, cellular tiffue between it and the conjunctiva ; J, the cartilage of the upper lid; m, marks of the febaceous follicles; rrs#, conjunctiva of the upper lid; rr, where it invefts the cartilaze and febaceous glands ; rs, where it is conneGted with the tendon by cellular tiffue; rst, «where it becomes reflected on itfelf ; st, where it is fpread cover the globe of the eye; yr 24 s, the fuperior burfa, or fold of :the-conjunétiva ; 4e, the fpace between the two layers, reprefented by the black line, as the two furfaces are in contatt; opg, the margin of the upper lid; g, the part where the {kin of the face becomes inflected, and con- ‘tinued into conjunGtiva; u, the cilia or eye-lafhes of the upper lid; 2, the opening of the coronary artery of the upper lid. ; , a—q, the lower eye-lid; a, fkin; 6, fat beneath it; c, -orbicularis; d, fat under the orbicularis; g¢ e, cartilage of the lower lid; fg 4, margin of the lower lid ; h,a groove ‘between the two edges; y, triangular hollow left be- ‘tween the edges of the eye-lids, and the eye-ball, when fhut ; 4—n, conjunctiva of the lower lid, difpofed as in the upper; y, /, the inferior burfa of the conjunétiva ; /, ‘lower eye-lath ; g, a quadrangular {pace between the cilia and the margins.of the eye-lids. 1—tr1, mufcles of the eye; I 2 3, levator palpebray fu- perioris; 4 5 6, rectus oculi fuperior ; 7 8 9, rectus inferior ; 10, the tendon of the obliquus fuperior ; 11, the flefhy part of the obliquus inferior. 12—r8, the optic nerve, curved, fomewhat like an italic Ss 12.13, the fheath of the optic nerve ; 12, its internal, ‘13, Its external layer ; 14, the thin membrane immediately invefting it; 15, the fibres of the nerve cut and expofed ; 16, part of the nerve as it paffes the bony canal, appearing compreffed from above below ; 18, the contracted extremi- ty of the nerve in the felerotica; 19, the principal trunk of the ophthalmic artery ; 20, the principal trunk of the ophthalmic vein; 21, fome brarches of the nerve of the fifth pair. 22—43, the bulb of the eye; 22 22, the axis of the ‘bulb; 23, the greateft tranfverfe diameter of the bulb; 24 —26, thecornea ; 25 2626, the fpace between the cor- nea and lens, divided into the anterior chamber, 25 ; and the pofterior chamber, 26 26; 247%, and 24r, 2 double groove between the cornea and {cleretica; 27—29, the {clerotica; 27, its anterior limit, with the double groove, -to which the annulus of the choroid is firmly fixed, 32; 28, the thinnelt part of the fclerotica; 30, the pigmentum nigrum between the f{clerotica and choroideas 31—37, tu- nica choroidea ; 32 33, the annulus gangliformis; 34, 35, ciliary proceffes ; 34 39 39, part of the choroid not cover- ed by retina, and which is generally of greater brightnefs than the reft; 36 37, the iris ; 36, the margin by which it adheres to the annulus and ciliary procefles; 37 26, the margin of the pupil; 38, pigmentum nigrum between the choroides and retina; 39 40 41, the retina, Its anterior termination pointed out by the line 39 46 39; 4o—46, . the chryftalline lens; 43 42, the long diameters; 44 45, the fhort diameter; 42-—44, its anterior convexity 3 42 45 43, its pofterior convexity ; 46 26, the capfule ot the lens; 34, 42, the diftance of the lens from the ciliary body. Fe this autline the forms and proportions of the feveral parts are preferved with the moft ferupulous exa@nefs, fo that any calculations made from it will be founded cor- rectly, Phyfiology of the eye,—To eftimate corre&tly the powera of the eye requires an acquaintance with the nature of light, and with the laws by which it is regulated ; an exaét knowledge of the organ ; and of the forms, proporttons, denfities, refractive and difperfive powers of the tranfparent parts, as well as of the radii of their curvatures. Since many of thefe points are hitherto but imperfeétly elucidated, we cannot expect to determine the funétions of the eye ac. curately in all their detail. Generally, indeed, in inveftis gating this delicate organ, the mathematicians have been deficient in correét anatomical knowledge; while anato. miits have been unacquainted with the feience and with the method of calculating accurately the refults of their obfer- vatious. Experiment and calculation prove that the huninous rays proceeding from any objeét to the eye undergo certain changes in their paflage through the tranfparent parts of the organ; that thefe changes ultimately colleét the rays, proceeding from the feveral points of the ebjeét, into oppo. fite correfponding focal, or nearly focal points on the reti- na ; and that the impreffion thus produced caufes the pera ception of the obje&, A fimple but interetting experiment will prove the point, Let an eye, from which the back of the iclerotica and choroid have been earefully removed, and thei place fupplied by oiled paper, or by the membrane which Lines the fhell of an egg, be placed in aroom with a fingle candle, with the cornea towards the luminous objeét, The image of the candle will be reprefented on the paper, diminifhed i fize and inverted. Vithout attempting ta calculate precifely the refraétion or difperfion of the rays in the different parts, we {hall trace them from the anterior furface of the cornea to their colleétion into foei on the retina, giving the change of direétion in general terms, The pencils of rays radiating from any objet, when they arrive at the furface of the cornea, form cones, the points of which are at the objeét, and the bafes an the cornea, Thofe which impinge on the opaque fclerotica are reflected, and have no concern in the produétion of vition: and thofe which, falling very obliquely, make a very confiderable angle with the cornea, are alfo refleted without penetrating inte the aqueous humour, ‘The rays, which fall within sn angle of about 48 degrees, pafs through this membrane, un- dergoing a certain refragtion, by which they are brought nearer to the line of the axis of the cornea; and, if produced, would converge into a focal point beyond the bottom ofthe eye. From the cornea the rays pais into the aqueous humour, They are divided by the difperfive powers of this fluid, fo that, if continued in the fame mes dium, they would uot only converge beyond the back of the eye, but on account of the aberration caufed by their dif. ferent refrangibility, would produce a confufed and coloured image. The rays colle&ted by the cornea pafs through the pupil, Thofe which come in an unfavourable direction are either reflected by the iris, or abforbed by the pigmentum on its polterior furface. The pupil admits only thole rays which are the neareit to tke axis of vifion, They then meet with tha chryttalline, which, by its refractive pgwers, colleéts them, and brings them into foci, after pafling through the lefa refractive medium of the vitreous humour an the concave furface of the retina, They do not impart a correct perception of the body which reflects them, unlefs they fall on the retina preeifel in the order in which they are detached from that oxip * EY 1. To produce this effe@, it is neceffary that all the rays, which proceed from any one point, fhould be colleéted in one point of the retina; and that all the points of union thus formed fhould be difpofed in the fame manner asin’ the body, of which they form an image. The cone of rays which proceeds from any luminous point to the cornea forms another cone, the apex of which falls onthe retina. ‘Thefe two cones have their axes almoft ina ftraight line. That which is perpendicular to the mid- dle of the chryitalline proceeds dire€tly to the bottom of the eye; that which comes from above falls inferiorly ; that on the left proceeds to the right, and fo on with re- f{pe& to the others: thus an inverted image is formed on the retina. Among the obvious advantages derived from the actual difpofition of the feveral parts of the eye, we may remark, * that the furface of the cornea only, if it had been more convex, could not‘have colleéted the lateral rays of a direct pencil to a perfect focus, without a different curvature near itsedges; and ther the oblique pencils would have been fubjeGted toa greater aberration, nor could have been made to converge on any focus on the retina. A fecond refrac- tion performs both thefe offices much more completely, and has alfo the advantage of admitting a greater quantity of light. ehe iris, by altering the diameter of the pupil, in the man- ner we have already noticed, will influence immediately the quantity of light admitted into the eye. If one eye is clofed, and we continue to look at the fame objeé, the pupil of the open eye dilates evidently, and contraéts again, as the other is opened, to its farmer diameter. The iris alfo intercepts fuch rays as would fallon parts incapable of re- fracting them regularly, or fuch as are directed fo obliquely on the cornea as to be too much refracted, admitting only the {maller pencil which enters the eye more in the direGtion of its axis. This reafoning applies, however, but partially, and only in cafes where the opening of the pupil is circular, and where the confufion which would arife from the aberra- tion of the extreme lateral rays may poffioly be prevented : it wiil not hold good where the opening is very much ex- tended, oblong, vertical, and, in fome circumftances, almott linear, as in the cat. The excentricity of the pupil men- tioned in the defcription of the iris can only fo far in- fluence the pencils of rays as to make them fall on the an- terior vertex of the chryttalline, with which it correfponds : the axes of the pupil, and the lens, do not correfpond with that of the cornea. From obferving that the pupil changes, when objeéts are brought nearer to or removed farther from the eye, phyfiologifts have fancied that alterations in its dia- meter are the principal means of adjufting the organ to dif- ferent diftances. But it has appeared from careful experi- ments that this contraétion and dilatation are irregular and _limited ; that by bringing the object nearer to the eye, within a certain diftance, the pupil not only ceafes to con-. tract, but becomes again dilated ; and, that beyond a few yards diftance, it alfo ceafes to dilate. In viewing the fun, inftead of dilating according to the diftance, it contracts mott clofely, obeying the quantity and intenfity of the light, rather than the diflauce of the object. In viewing a lels -lumizous ébjeé, the pupil dilates, when it is more dif- tant, a greater.quantity of light being neceflary to pro- dtice a clear impreflion; as the object is brought nearer, we require a Icfs degree of light, and the iris contraéts to exclude what is fuperfuous Thus far the iris may be ule- ful in accommodating the eye to different diftances ; it may ed the quantity of light, but it cannot alter the di- on. In quiefcent vifion, the pupil preferves its diame- Vou. XIV. ter with fteadinefs, when the proportion of tight neceffary to be admitted is once determined. By its contraétion, when a nearer objet is viewed, it leflens the confufion which would arife, in feb eyes as cannot accommodate themfelves fufit- ciently by powers hereafter to be examined, from the mag- nituce of the imperfeét focal points on the retina. Some infzétion of the rays may hare place in paffing the edge of the pupil; but its great mobility, the wix the openiag, and its very {mall diftance from the chryf prevent any apparent confufion. Where from any caufe the opening is very narrow, and the iris has but little motion, a confufion may certainly take place from this caufe. The alterations of the pupitaccommodate the eye to v: ous flates of difeafe, by regulating the quastity of light. When a great number of rays would eccafion p2in in.an inflamed organ, the contraétion of the eperture excludes the light; while a proportionate enlargement of the pupil provides againit the inconveniences of diminifhed fenfibility, by admitting the greateft quantity of rays. As the chryttalline lens diminifhes in denfity gradually in every direGtion, approaching the vitreous humour on one fide, and the aqueous on the other, Mr. Ramfden fuppofes that its refractive power muft be the fame with that of the two contiguous fubftances. Its principal ufe appeared to him to be that of correcting the aberration arifing from the {pherical figure of the cornea, where the principal part of the refraction takes place. From the conftitution of the chryftalline he inferred, that it will refraét the rays of light without refle¢iing any of them ; fo that, although we have two furfaces of the aqueous, two of the chryitalline, and two of the vitreous humour, we have only one reflected image, and that being from the front of the cornea, there can be no furface to refle& it back, and dilute the image on the retina. If the furfaces of the chryttalline had been abrupt, there muft have been a refle@ion at each, and an apparent hazinefs would have interfered with the diftin® view of every luminous object. The {maller deafity of the lateral parts will not only correét the aberration of the {pherical furface of the cornea, but will canfe alfo the focus of each oblique pencil of rays to fall either accurately, or very nearly fo, on the concave furface of the retina, through- out its extent. Had the refra@tive power been uniform throughout the whole fubitance of the lens, it might have collected the lateral rays of a dire& pencil nearly as well, bat it would have been lefs adapted to the oblique pencils of rays. Alfo, the gradual! increafe of denfity in approach- ing the centre makes the chryftalline equivalent to a much more refractive fubltance of equal magaitude. The principal ufe of the vitreous humour appears to be that of giving a ready paflage to the rays of light, as they are converging into foci on the retina, and of keeping at the fame time the furface of the latter uniformly {pherical. It would allow a change of figure in the eye, or in the lens, or even a change of place in the latter, fuppofing there were powers in the living organ adequate to the purpofe. Some have conceived that the retina is not equally fenfible in all parts, and that a certain portion only, near the axis of the eye, is capable of conveying diftin@ impreffions of minute obje&ts. Comparetti fays that diltinct vifion is effeéted only in the optic axis, which is moved mott rapidly over every point of the object ; and that what is feen appa- rently out of the axis is caufed by the direétion of the firit impreffion in the axis. We believe, however, that the limits of diftin vifion are far more extenfive. Dr. Young, {peaking of his own eye, fays, that the vifual axis being fixed in any direGtion, he can fee at the fame time a lumi- : nous Pry I YE; nous objeé&t placed at confiderable difeances from it; the angle, however, differs. Upwards it extends to 50 degrees, inwards to 6c, downwards to 70, and outwards to 99 degrees. Thefe internal limits of the field of view nearly correfpond with the external limits tormed by the different parts of the face, when the eye is directed forwards and fomewhat downwards, which 1s its moft natural pofition ; and both are well calculated for enabling ws to perceive the moft readily fuch objects as are the molt likely to concern us. The extent of the retina is every way greater than the limits of the field of view. The whole extent of perfect vifion is little more than ten degrees; or, more ftrictly fpeaking, the imperfection begins within a degree or two of the vifual axis, and at the diftance of five or fix degrees becomes nearly flationary, until, at a flill greater diftance, vifion is wholly extinguifhed. ‘The imperfection may be owing partly to the unavoidable aberration of oblique rays, but principally to the infenfibility of the retina ; for, if the image of the fun itfelf be received on a part of the retina remote from the axis, the impreffion will not be fufficiently flrong to form a permanent {pectrum, although an object of very moderate brightnefs will produce this effect, when diftinéily viewed. The motion of the eye has a range of about 55 degrees in every direction, fo that the field of perfe& vifion, in fucceflion, is by this motion extended to 110 degrees. It appears from fome experiments of Haldat’s, made by roducing an artificial ftrabifmus, that the opinion, which janes the pofition in which an image can be feen diftinéily to a point at the bottom of the eye, is by no means recon- cileable with aGtual obfervation. For, in an artificial ftrabil- mus, one of the impreflions falling on a part without the vifual axis, ought not to produce any perception of the objet; this we know not to be the cafe. From this fat alone we may conclude that the place of the image is not necefla- rily confined to the axis, but that many points of the furface ef the retina are capable of conveying an impreffion of it. As the angle is increafed, the perfection of the image may be leffened ; but we do not lofe the perception of it until its pofition is fuch, that none of the rays proceeding from it directly can be brought to converge on the potterior hemifphere of the globe. This would appear to conform alfo with our ideas of the nfe of the extent of the retina, for which, if the field of vifion was fo extremely limited, we could affign no reafon, The points of it, at a diftance from the axis, may be lefs favourably difpofed, but are not per- haps lefs fufceptible of being aflefted. “ The whole of the retina is of fuch a form as to receive the moft perfect image on every part of its furface, that the {tate of each refraéted pencil will admit ; and the varying denfity of the chryital- line renders that flate more capable of delineating fuch a picture than any other ima le contrivance could have done.”? To illuftrate this, Dr. Young has given an ex- cellent diagram, reprefenting tke7fucceflive images of a diftant obje@ filing the whole extent of view, as they would be formed by the fucceffive refraGions of the dif- ferent furfaces. In oppofition to the obfervations given above refpe€ting the decreafing fenfibility of the retina semarked by Dr. Young, it has been obferved by others, that, on comparing the impreffions produced by rays parallel to the optic ax:s with thofe by rays much inclined to this axis, they have appeared to differ in intenfity only in a degree correfponding to the diminution in the extent of the opening of the pupil, produced by the obliquity of its plane to the luminous rays, and by the obliquity of the rays themfelves to the refraGting fubftances through which they pafs. At the moil, the difference of the clearnefs of the impreflion is not fuch as it would be, if it depended on a diminution of the fenfibility of the retina, proportionate to its diftance from the optic axis. Notwith{tanding the influence of the caufes juit mentioned, the light of a candle pafliag into both eyes, when their axes are artificially inclined, fo that the images make angles of 15 to 25 degrees with the optic axis, fuffers no apparent diminution of brightnefs.. This faé& certainly gives-to the field of diftin& vifion a more confiderable extent than that ufually affigned it. The point of the retina, which correfponds to the optic axis, may poffibly be the place of mot perfe& vifion ; not becaufe it is endowed with a greater fenfibility than other parts of the retina, but from its being in the exa@t focus of the re- fractive powers of the eye, and the only point where the image can be imprefled with every perfeétion. In confidering the fenfibility of the retina, the effets of the pigmentum muft not be overlooked. In the kuman fubjet the pigment varies in colour ; but is always more or lefs dark. In animals, where the pigmentum is more than of one colour in the fame eye, the lighter portion is always- placed at the bottom of the eye, including the entrance of the optic nerve in its fweep; the colour varies in different animals, but has always a brilliant furface. Probably the light has.a greater effect on the retina, in eyes which have a white pigmentum, than in fuch as poflefs a dark one. Hence all animals fee more or lefs diftinétly in the dark, ac- cording as their lucid tapetum approaches nearer to a white or black colour. Man, in whom it is dark, fees very im- perfectly in a light where a cat, or dog, would perceive objects with tolerable clearnefs. We may obferve, that when either of the latter look at us in the dark, the whole pupil is enlarged and illuminated ; but in a full light there is no fuch appearance. Here there mutt be a reflection of light from the bottom of the eye to produce the effeét ; and the reflected light is always of the bat colour with the tapetum. Thofe individuals of our fpecies who have a light pigmentum, fee much better with lefs light tian thofe who have it dark. Inthe Albino, where the colour- ing matter is exceedingly thin, or wholly deficient, the common day-light is far too powerful to admit of difting& vifion. When he attempts to examine the qualities of an object with precifion, the eye-brows are knit, and the eye- lids kept almoft fhut. In the twilight he can fee more plainly, as the luminous rays are then not too intenfe for the very fenfible retina. The ferret is deftined, from its mode of life, to fee in dark places ; and its pigmentum is naturally white, The rays which pafs through the tranfparent retina are difpofed of according to the refleGting powers of the pig- mentum. In man, who requires diftinét vifion in a mo- derate light, rather than the power of feeing where light is almoft wholly wanting, the pigmentum is dark, and the rays are abforbed, and entirely loft; therefore, in fuch eyes, it can add nothing to acutenefs of vifion, and a confiderable quantity of light is required to produce an adequate im- preffion on the retina. The rays are then loft in the pig- mentum, and the accuracy of the image is no way impeded. In animals, who require a great acutenefs of fight, the rays, reflected from a light and brilliant furface, again imprefs the retina, and increafe the power of vifion. ‘The iterval of time is too fhort, and the diftance between the points they may firike in their double paflage too minute, to occa- fion any indiltinétnefs of the image. y Diftin& vifion requires that the obje& fhould be fixed, and not allowed to move over the furface of the retina. To accomplifh this obje&t, the mufcies of the globe are employed in the manner above defcribed. We-believe the 3 impreflion ' n EY E; impreffion made on the retina by the lumindus rays to be in fome degree permanent, and the more fo as the light is ftronger. The duration may vary probably from 1oodth of a feeond to nearly a fecond. Hence the well-known phenomenon of the circle of light in revolving a lighted Hick. If the object is painfully bright, the fenfation is more permanent, and vanifhes at laft gradually. It is very difficult to afcertain the proportions of the eye fo exaétly as to determine with certainty the magnitude of the image on the retina, as the iituation, curvature, and conititution of the lens.will make a very material dif- ference in the refult. It is proportionate to the magnitude and diftance of the objeé&, and is meafured by the angle which each end of the object makes with the retina. The more remote therefore the objeét, the fmaller the image, a8 it is included in a {fmaller angle: when the diftance is fo great as to put an end to diitin& vilion, we fuppofe the angle on the retina to be too acute to convey any precife idea of the fize of the objet. By alcertaining the leatl poffible obje& that the eye is capable of difcerning, we may thus form fome conjeéture as to the fmalleft poffible image. The power varies no doubt in different individuals, and has been varioufly eftimated. ‘Ihe eye of almott all perfons can perceive diftinétly two points fubtending an augle of a minute; in fome perfons it ean diftinguifh the difference of obje@s fubtending an angle of 20 feconds. A fingle objet, if bright, and at the proper diftance for dif- tinct vifion, (about eight inches, ) may be difcerned, though not fubtending an angle of two feconds and an half. Haller fays even lefs than this. Jn the feétion of a gilded filver thread, the gold may be diftinguifhed from the filver, when ~ not exceeding yy5~4755,dth of a line in thicknefs. Ac- cording to the rule above-mentioned, the image of dif- tinction in this cafe muft form on the retina a point almoft incalculably fmall, and yet fuch is the fenfibility of the latter, that the difference of the objects is scoatels deter- minable. This far exceeds the common opinions concern- ing the powers of the eye in difcerning minute objects. Experimeut has flewn that there exilts in the retina an infenfible {pot, about an inch in diameter; if the image falls on this, no perception is produced, Two pieces of white paper are fixed on a wall fomewhat darkened, about level with the eyes, two feet diltant from each other, the left eye is then thut, and the right eye directed upon the left objet; if the obferver moves flowly backwards, the object, although four inches in diameter, will difappear at the diftance of nine or ten feet. The experiment may be made more fimply with the two thumbs, er two candles. The latter are as, fay at ten inches from each other; at a diflance of 16 feet, if the eye is directed to a point four feet to the right or left of the middle of the {pace between them, they are loft in a confufed {pot of light; but any inclination of the eye brings one or other of them into the ‘field of view. The objeé is fuppofed to vanifh, or become . obicure, when it falls directly on the {pot occupied by the entrance of the optic nerve. Different experimenters have varied in their eftimate of the diameter of the infenfible {pot, from the fortieth part of an inch, to a seventh part of the diameter of the Bulb ; the firlt we believe to be too fmall, the daft certainly too great. Since the difcovery of the central foramen in the retina, a que{tion has been ftarted, whether the want of the retina at this {pot does not account more fatisfaétorily for the vanifhing of the obje&, than any fuppofed infenfibility at the entrance of the optic nerve? The anfwer is, that the fituation of this foramen in the retina does not correfpond with the part oppofed to the objeét, when rendered inyifible ; and chat the entrance of the optic nerve ag found to be precifely in the part oppofed- The orifice itfelf is placed juft at the end of the vifual axis, and muit, we fhould conceive, have fome material office at- tached to it, and have a confiderable effe€t on vifion. The faturation of the yellow ring around it appears by obferva- tion to be conneéted with the acutenefs of the organ. Mr. Home fays, ‘it is probably too {mall to produce any defe& in vifion :” that it produces no defect we readily admit, but that it is too {mall to influence vifion, 1s not, we think, at all probable. Its ufe has not been as yet afcertained. Blumenbach advances the following conjecture on this point. Man, and fuch animals as have the two eyes placed with the axis parallel, thereby gain the advantage of feeing ob- jects with both eyes at once, and therefore more acutely. But at the fame time they are expofed to this inconvenience, that in a ftrong light both eyes become dazzled at onceg and this happens fo much the fooner, becaufe the light falls on the correfponding principal focufes of both eyes at once. ‘This inconvenience ieems to be obviated by the foramen centrale ; fince that part which forms the princi- . pal focus of the eye opens in a dazzling light, fo as to form a kind of {mall pupil, through which the concentrated rays pafs, and fall on the pigmentum beneath. Since the images are pictured inverted on the retina, many difputes have arifen as to the caufe of our perceiving the objects ereét. If it be allowed that we judge of the fituation of each luminous point by the direction of the rays it tranfmits, it follows, that we muft fee bodies as we really do fee them, in their proper pofition. The opinion that we really fee objects reverfed, and correct the fenfation by experience and jucgment, derived from the other fenfes, is liable to very numerous objections. The chick juit hatched knows where to direct its bill; and perfons born blind, who have fuddenly gained their fight, fee objeéts in their proper pofition. We do not fee the picture on the retina, but the object itfelf in the dire@tion of each of the rays which conveys to us the fenfation, or, to fpeak more correétly, in the direétion of the axis of that pyramid, which a pencil of divergent rays forms in proceeding from any point of an object to the eye. Berkeley explains the f{uppofed difficulty in another way ; he does not allow that we can eftimate the fituation of parts or objeéts by the decuffation and direction of the rays of light, as the mind neither perceives the interfections of the radious pencils, nor purfues the impulfes they give in right lines: without perceiving them it cannot form a judgment, and it cannot perceive them without a confciouinefs of fuch perception. The fituation of vifible obje&ts muit be entirely relative, and depend on the place which they occupy with regard to each other. And as all vifible objects are inverted at the fame initant, each will be in the fame relative fituation on the retina as it isin aQyally. Thus the terms of above and below are arbitrary expreffions, by which it is agreed to call upper, what correlponds to the heavens, and lower, what correfponds to the earth. Now it is evident, that at the bottom of the eye the fituation of thefe is inverted, the earth is above, and the heavens below. We call that the lower end of an obje& which-is neareft the ground; and the image of a man’s feet, being in conta& with the image of the earth on the retina, we naturally infer thet they are in contaét with the actual earth; the head being more remote from the earth, we {uppofe that it is higher. The confufion has arifen from mixing the ideas derived from the different fenfations of fight and tonch. You fay, (to ufe the words of Dr. Berkeley,) the picture of the man is inverted, and yet the appearance is ere&t. I aik you what mean you by eee of the man, or, which 2 is BY! Et isthe fame thing, the vifible man’s being inverted? You tell me, it is inverted becaufe the heels are uppermoft, and the head undermoft. Explain me this: you fay, that by the head being undermoft, you mean that it is neareft to the earth; and by the heels being uppermoft, that they are fartheft from the earth. I afk again, what earth you mean? You cannot mean the earth that is painted on the eye, orthe vifible earth; for the picture of the head is fartheft from the pi€ture of the earth, and the picture of the feet neareft to the piture of the earth ; and accord- ingly the vifible head is fartheft from the vifible earth, and the viftble feet neareft to it. Ut remains therefore that you mean the tangible earth, and fo determine the fituation of vifible things with refpe&t to tangible things, which is abfurd, and perfetly unintelligible. The two diftin@ pro- vinees of fight and touch fhould be confidered apart, and as if their objets had no intercourfe, no manner of relation to one another, in point ef diftance or pofition. Two diltin& images are painted, one upon each eye, and yet we only perceive a fingle object. Many very different explanations have been given of this phenomenon; the moft fatisfactory is, that in the two eyes there are correfponding parts of the retin which are probably fufceptible of the fame impreflion in equal degree, and convey it to the fenfo- rium in that equal degree: hence, as long as fimilar points of the images fall upon the correfponding points of the re- tine, the perception of the fame object is fingle. Itis dou. ble for the fame reafon whenever the difpofition of the vi- fual axes is deranged. Every objeét which produces two diftinG images on the retinz is neceflarily placed at the point of interfeCtion of the optical, or vifual axes, and is painted confequently on correfponding points of the retine. By an artificial preffure on one of the eyes we may fo dif- place its vifual axis, or point of moft perfeé vifion, that the two Images fhall not fall on thole parts of the retine of the two eyes ufually impreffed fmultaneoufly ; a double image is the confequence. The optical axes are fo nearly parallel to each other, that they naturally meet at a great diftance: but, in order to preferve the fimplicity of the perception, when we look at an obje@ brought nearer to us, we make them converge towards it by means of the external mufeles of the eye, which is further adjufted to the decreafing dif- tance by fome other of its powers, fo as to convey a fingle and diftiné&t image of the objeét. This opinion is con- firmed by fome obfervations of Mr. Home’s on double vilion as the confequence of a want of correfpondence, produced by fome change in the refraéting media of one of the eyes, or elfe by a want of fimilar aGtions in the mufcles of both eyes refpeétively. The former takes place after the chryttalline lens has been extracted, and the convex lens made ufe of to produce the requifite focal adjuftment is not pro- perly placed. Yet, when objeéts are in rapid motion, or when brought very much nearer to the eye than the point of diftin& vifion, may not the impreffions be made on points not exatly fymmetrical, or in the vifual axis, without producing double vifion? It appears from experiments that it is not abfolutely neceflary that objects fhould fall on the vifual axis in order to produce fingle vifion, but that there are many points at different diftances from the axis on which, if the images fall, they will appear but as one. In the tranverfe plane the optical axes muft be much inclined (about 15 degrees), in order to produce a double image ; in the ver- tical, a very flight inclination is fufficient to caufe it. It is inferred from thefe experiments, that the limits of the field of fingle vifion, or of the area of the points of correfpondence, will form an ellipfe, of which the long axis correfponds to the tranfverfe axis of the globe, and the fhort to the verti cal axis: the firft of thefe is about three lines and a half in length, the laft fearcely one. It has been a matter of doubt, how far the judgment is concerned in the per- ception of the fingle image. Obje&ts appear fingle, it is faid, although there is a double image, becaufe the touch which correéts the impreffion produced by vifion teaches us that the fame objeG&t we fee double is aétually fingle. Ex- perience and cuftom have fo well eftablifhed our judgment, formed from thefe two fenfations, that we cannot derange it by the will. An argument againit this is, that in cafes where perfons born blind have obtained their fight, the ob- ject is at once feen fingle. As double vifion is produced by a moderate derange- ment of the optic axes, fquinting is produded by a much greater derangement. It does not follow that the fquinting perfon fees every obje& double, for the apparent improper direGtion of the eye may be owing to the unufual fituation of the parts of the eye, fo that the image may yet fall en correfponding parts of the retine. The more probable explanation is, that the object is not feen by both eyes ; but that one eye, more or lefs perfeét, is direCted to the object ; while the other, which in fuch cafes isimperfect,is drawnafide by habit, in order that its operation may not difturb the im- prefiion received by the other eye. The greater ftrength, fhortnefs, and ftraightnefs of the reétus internus mufcle, may be the reafon that the deviation 1s made towards the nofe. Squinting takes place in three different circumftances ; when one eye has only an indiftin® vifion; where both eyes are capable of feeing objects, but the one is lefs perfect than the other; and where the mufcles of one eye have, from practice, as in the cafe of frequently looking through telefcopes, ac- quired a power of moving it independently of the other. The fuperiority of vifion with one eye over that with two has been the fubje&t of many difcuflions. It is commonly fuppofed that the firft produces the moft diltiné& per- ception; the opinion, however, is not correét. If we place a fheet of white paper directly before the eyes, and bring any opaque body, a book for inftance, before the right eye, fo that half the paper is concealed from it, while the whole is vifible to the left; on regarding the furface alternately with one, or both eyes, we may obferve diftin@tly that the part vifible to both eyes is brighter and clearer than that which is vifible only to the left: the firft is of its ufual whitenefs, the laft is obf{cured by a flight fhade. The fuperiority of telefcopes with two eye glaffes, over thofe with one, is univerfally acknowledged. In vifion, with two eyes, therefore, we believe the impreflion to be ftronger, the fenfation more vivid, and the perception clearer; not doubly fo as the impreffion is, becaufe we can with difficulty diftinguifh coincident fimilar impreflions. Ifwe look at any obje& through fluids of two different colours placed one before each eye, the obje& will appear of the colour refult- ing from the mechanical mixture of the two employed. If the colours were yellow and red, the perception would be as from orange, &c.3 proving that a double impreffion produces in this cafe a compound or mixed fenfation, from which a fimple perception arifes. “There are many other phenomena attendant on the feparate vifion of different objects producing different combinations of them, which our limits will not allow us to difcufs. The reader will find this fubje&t very amply confidered by Dr. Haldat in the Journal de Phyfique, t. 63, and illuftrated by numerous apparently accurate experiments. The con- clufion to be drawn from them is, that in many cireumftances vifion with both eyes will produce a fimple perception, an apparent combination of objeéts varying in colour and form when they are viewed ieparately by each eye, And that 4 objects By Vos ebje&s are not increafed in their apparent dimenfions. when feen wita both eyes, although their brightnefs is rendered more intenfe under the fame circumftances. The image of the obje& is fuppofed to be painted on the retina, free from any prifmatic colours produced by the dif- ferent refrangibility of the rays, which might render it con- fufed. The tranipareat parts of the eye are fo difpofed as to correét the aberration of the vifual rays, and to prevent their final difperfion. Thefe effects are principally effected by the curvatures and conttitution of the chryttalline already infifted on, which produce the fame effet that in an achro- matic obje@ glafs we obtain in a lefs perfect manner, by proportioning the radii of curvature of different lenfes. In the eye it has been generally fuppofed that the correétion is perfect, the regular diminution of the dentity of the chryt{tal- line, redreffing the errors caufed by the cornea and aqueous humour. The perfe€tion of the achromatic powers of the eye has been called in queftion by many able men, efpecially in confequence of experiments related by Mafkelyne, Comparetti, and Dr. Young. Dr. Maflkelyne, by calculat- ing the refra€tions of the mean, moft, and leaft refrangible rays at the feveral humours of the eye, inferred a diffufion of the rays, proceeding from a point in an object, at their falling on the retina. The circle of diffipation, however, would be too fmall to occafion any confufion ; and he fhews that the picture of objects on the retina is relatively, if not abfolutely, perfect, and fitted for every ufeful purpofe. The experiments and obfervations of Comparetti are inge- nious ; he fuppofes that the chryttalline leus cannot, under all circumftances, correé the difperfion of the rays, although he conceives it to be fufceptible of certain alterations of pofition direéted folely to that purpofe. His experiments are too numerous, and complicated to be introduced here in any fhape. He proves, perhaps, a flicht imperfection, under certain circumitances. Dr. Young does not think that the ftructure of the chryftalline, or any other provifion, has the effet of rendering the eye perfeily achromatic. He adduces the colour bordering the image of an objeét-feen indiftin@ly ; the colours perceived on viewing an object through {mall openings, fuch as thofe of his optometer; and the follow- ing experiment mentioned by Dr. Wollatton. He looks through a prifm at a fmall lucid point, which of courfe becomes a linear fpeGtrum. But the eye cannot fo adapt itfelf as to make the whole fpeCtrum appear a line ; for if the focus be adapted to collet the red rays to a point, the blue will be too much refraéted, and expand into a furface ; and the reverfe will appear if the eye be adapted to the blue rays; fo that in either cafe the line will be feen as a triangular {pace. He concludes alfo by another experiment, that the red rays, from a point of twelve inches diftance, are as much refracted as white or yellow light, at eleven. The inference is, that the eye is not capable of uniting at the fame point all the elementary colours of light. Thefe obfervations have been examined with much ingenuity by Haldat, who draws from them arguments highly in favour of the achromatic powers of the eye. The flight appearances of the decompofition of light at the edges of minute bodies are not owing to any inequality in the refractive powers of the eye on the different rays ; but to the attraction which thefe bodies have for the luminous rays, which {trike on their furfaces, after being reflected from the plane on which thefe {mall bodies are placed. When placed on a black wall, or table, no reflection takes place, and no colours are vifible at their edges. It is evident, that if differently coloured rays are unequally refracted by the eye. {pots of different colours fhould produce penumbre of unequal extents, proportionate to the refrangibility of the rays they may refle&t. But circular pieces of card, equal in fize, and about a line and a half in diameter, painted red, yellow, blue, green, viewed on black, or white walls, at equal dif- tances, and at the fame time, offer penumbrz of equal extents. The colour obferved on viewing objects through the optome- ter is caufed by the luminous rays, by which we perceive them, being neceffarily ated on by the narrow opening through which they pals; and no further decompofition of the light takes place than can be readily accounted for by prin- ciples well eftablithed in optics. If this were not the cafe, why fhould the eye be fuppofed to decompofe rays which come through narrow apertures, and not thofe which arrive without any external obftacle to theirnatural radiation. In bodies feen indiflinétly, the rays which glance on their mar- gins are decompofed ; and this difperfion, not vifible at a dif- tance from the mixture with the undecompounded rays which are in the greateft number, is plainly feen when the object is brought clofe, becaufe they arrive at the retina almoft without any intermixture. The colours, therefore, feen at the edges of fuch bodies, do not arife from any fup- pofed imperfection in the refractive powers of the eye, when the object is brought clofe to it. In order to draw a conclufion that the humours of the eye are not achromatic, luminous rays fhould be brought to bear on them, fuch as they are when radiating from a luminous body, and without undergoing any decompofition in their paflage from caufes external to the eye; it fhould then be preved that they undergo a decompoStion in pafling through the kumours, and that this difperfion cannot be corrected. In the cafe of the prifm, the feparated rays may appear to be refracted unequally, becaufe the fpeCtrum is not linear in its whole extent. But on account of this very extent, they arrive at the tranfparent cornea with different inclinations, in unequal proportions, aud impinge on a refraéting medium, the curva- ture and denfity of which are uneqnal: we cannot therefore expect an equal refraGiion. ‘The eyeis capable ot preferving the natural mixture of the elemenzary rays which arrive at its furface; its not having the power of recompoiing thofe rays, which artificial external caufes have diffipated, is not fufficient to induce us to conclude that its achromatic powers are not perfe&t. The perfe&tion of the achromacy of the eye is further proved, by there being no diminution whatever in the diftinéinefs of the image, when, by an artificial dilatation of the pupil, by means of belladonna, the anterior furface of the chryitalline is almoft wholly expofed. Again, when the greateft poffible inclination has been given to the raySy no colour is perceptible. The luminous rays, which arrive at the eye from an ob- ject at fome little diftance, will unite into a focus at a cer- tain diftance behind the chryftalline lens. Rays, which pafs from an object clofer to the eye, as they diver confiderably, will unite into a focal point at a greater tance behind the chrytftalline, and indiftin vilion woulc the neceflary confequence, if the eye had not the power either of elongating its axis, or fhortening its focal diftance; fo tha in thefe very oppofite conditions the rays fhould converge equally into a point on the retina, This power of adjult- ment to diftance is one of the moft important to the per- fetion of the organ, and has excited the attention of every writer on the mechanifm of vifion; all allowing that fome change muft be produced, but few agreeing as to its na- ture or mode. The fubje& has been particularly agitated in this country, and has called forth many excellent obferva- tions on the mechanifm of vilion, which, if they have not finally proved the means by which the accommodation is brought about, have, at leaft, proved the fallacy of moft of the theories adopted to account for it, To us, - t. EY, Ey Dr. Young’s opinion, of the change of the focal dittance b;~fome alteration in figure of the chryftalline, appears the mott fatisfactory, and fupported by the mott decilive proofs t the manner in which this alteration is effected, is a point not perhaps as yet demonftrated, however conclufive the ar- guments may be in favour of fuch alteration actually occurring, There isa certain point at different diflances in different perfens, from which luminous rays, pafling to the eye, will be brought to a focal point on the retina, without any apparent exertion of any part of the organ. This is called the point of perfect indolent vifion. In perfons who are near-fighted, or in whom this point is pretty clofe to the eye, owing to the too great refractive powers of the organ, the rays from objects at a moderate diftance are brought toa focus at a point anterio: to the furface of the retina. In fuch cafes the divergence of the rays is increafed, by means of a concave lens, and a confu- fion of the image is prevented. In thofe who are long fighted, where this point is at a greater diftance, the rays from near objeéts cannot be brought to focal points foon enough to imprefs a diftinct image, and the defect depends on caufes the converfe of thofe which produce the myopic or near-fighted eye. It is remedied by a convex lens, We poflefs, however, in the perfect eye, the power of fee- ing diftinétly objects much nearer to the eye than this fuppofed point of diftinG vifion; and this exilts in very different degrees in different individuals, It is equally true, onthe other fide, that we cannot, by any volition, accom- modate the eye to view objeéts at a diltance greater than that of indolent vifion, a circumftance eafily experienced by any one. Jn the year 1793 Dr. Young made fome obferva- tions on the ftruCture of the eye, and its provifions for ad- juftment, among which are accounts of the theories of adjuit- ment, propofed by various earlier writers. Of thefe we fhall fay nothing, as a reference to the anatomical defcrip- tion of the eye, and other remarks already detailed, would at once refute the greater part ofthem. It was the opinion of Dr. Young that rays of light, pafling from objects at a {mall diftance, could only be brought to foci on the retina by a nearer approach of the chryitalline to a {pberical form: this change, he believed, was effeGted by the mufcularity of the lens. In the following year, fome obfervations of John Hunter on this fubje& were publifhed by Mr. Home, from which it appears, that he had for many years enter- tained a notion, that the chryttalline humour was enabled, by its own internal ations, to adjuftitfelf, fo as to adapt the eye to different diftances. Mr. Hunter had inftituted fome experiments, but died before he had made fufficient progrefs to draw any conclufion. Inthe fame year, Dr. Hofack, in a paper ofvifion, controverts Dr. Young’s deductions with regard to the mufcularity of the lens, and attributes the ef- fects produced in adjuftment to the aGious of the mufcles. He aflumes, as the neceffary confequence of contraétion in thefe mufcles, that the axis of the eye will be elongated, and the elattic cornea rendered more convex ; both which circumftances would tend to preferve diftinétnefs of vifion with regard to near obje&ts. In order to prove that the eye is capable of having its focal adjuftment confiderably varied by external preffure, he applied the common {peculum to his own eye, and by increaling the preffure of it confider- ably, was enabled to fee objects diftinGly, though placed much nearer than the natural focal diftance. ‘The means, here made ufe of to afcertain the fact do not appear to us very accurate. In the Croonian lecture for 1795, Mr. Home relates a feries of experiments and obfervations made by himfelf and Mr. Ramfden, from which he concludes, that the eye has a power of adjufting itfelf to different dif tances, when deprived of the chryftalline lens; and that, therefore, the fuppofed fibrous, and laminated ftru€ture of that lens, is not mtended to alter its ferm, but to prevent refletionsin the paflage of the rays through the furfaces of media of different denfities, and to corre&t fpherical aberra- tions ; that the cornea is elaftic, capable of being elongated ;{,th of its diameter ; that the tendons of the fiat ftraight mufcles terminate in forming a lamina of the cornea; and, that in changing the focus of the eye from feeing with pa- rallel rays to a near diftance, there is a vilible alteration pro- duced in the figure of the cornea, rendering it more convex ; and when the eye is again adapted to parallel rays, the alte- ration by which the cornea is brought back to its former {late is equally vifible. The exertion required to adjuft the-eye to near diftances, and the eafe with which it is adapted to remote objects, proves that the firft wasa pofi- tive action, and the feconda relief. The defec& of elafticity in the cornea, inferred to arife from age, is applied to explain the changes of vifion which take place in advanced life. By fome further experiments Mr. Ramfden and Mr. Home were induced to abandon the opinion that the adjuftment is pro- duced folely by the alteration’ of the convexity of the cornea, which might probably be fufficient when the lens was re- moved, but not when the eye is entire. Mr. Home aflumes that the action of the ftraight mufcles will clongate alfo the axis of the eye, and produce an effe€ upon the chryftalline lens, and ciliary procefles, pufhing them forward in propor- tion as the corsea is ftretched. Granting thefe two laft changes, Mr. Ramfden computed that the increafe of the curvature of the cornea may be capable of producing one- third of the effeet, and that the change of place of the lens, and elongation of the axis of vilion, foticietly account for the other two-thirds of the quantity of adjuflment neceflary to make up the whole. We mutt here obferve, that it is not yet demonilrated that the aétions of the ftraight mufeles can produce the effe& afcribed to them. They have been fup- pofed by others to flatten the eye, and fhorten its axis, upon arguments equally plaufible. We believe they have but little effet, except that of direGting the axis of the eye to the objeét, and doubt if they can exert any preflure on the globe. Neither is it afcertained what effeét fuch pref. fure would have in elongating the axis, pufhing forwards the lens, or increafing the curvature of the cornea. ‘The opinion that the chryftalline lens is moved forward by the action of the ciliary proceffes, is equally gratuitous. In the yea 1800 was publifhed an excellent paper by Dr. Young, on the mechanifm of the eye, in which he examines, with great acutenefs and accuracy, the different opinions on this fub- ject. It is impoffible to give an abftra& of his obfervations in the compals of this article; we muft refer the reader to the paper itfelf, for the detail of all the proofs by which he endeayours to eftablifh his opinion of au alteration in the figure of the chryftalline, and give here only the general conclufions drawn from his inveftigations. “¢ The arguments in favour of an increafe of the convexity of the chryiftaliine lens are of two kinds; fome of them are negative, derived from the impoffibility of imagining any other mode of per- forming the accommodation, without exceeding the limits of the aGtual dimenfions of the eye, and trom the examina- tion of the eye inits different ftates by feveral tefts, capable of deteGing any other changes if they had exifted: forex- ample, by the application of water to the cornea, which completely removes the effects of its convexity, without im- pairing the power of altering the focus, and by holding the eye, when turned inwatds, in fuch a manner as to render any material alteration of its length utterly impoffible. Other arguments are deduced from pofitive evidence of the change ¥ ! ee i 2p change of form of the chryftalline, furnifhed by the parti- cular effeéts of refraction and aberration, which are obfer- vable in the different {tates of the eye ; effects which furnilh a direét preof that the figure of the lens mutt vary 5 its fur- faces, which are nearly fpherical, in the quicfcent form of the lens, afluminga different determinable curvature, when it is called into exertion. The objeétions which have been made to this conclufion are founded only on the ap- pearance ofa flight alteration of focal length in an eye from which the chryftalline had been extracted; but the fact is neither fufficiently afcertained, nor was the apparent change at all confiderable : and even if it were proved that an eye without the lene is capable of a certain {mall alteration, it would by no means follow that it could undergo a change, five times, or ten times as great.’ The means whereby ye are enabled, by fight, to deter- mine the diftance, maguitude, and fituation of objects have not been fufficiently explained to allow us to fpezk with confidence. It is acknowledged that the eftimate we make of the diftance of objects confiderably remote, is rather an act of judgment grounded on experience than of fenfe. When we perceive a great number of intermediate objects, which we have experienced to take up a confiderable {pace, we conclude that the object we fee beyond them is at a great diflance. When an objeét appears faint and fmall, which at a near diltance we have experienced to make a ftrong and large appearance, we conclude it alfo to be far off. Tt is f{uppofed by fome that when an object is fo near that the interval between the eyes bears any fenfible proportion to it, the two optic axes meeting at the object, make a fen- fible angle, by means of which, according as it is greater or {maller, the objet is perceived to be nearer or further off. This does not depend on judgment formed from experience, but refults from a fuppofed neceffary conneétion between the idea of an obtufe angle and a near diftance, and an acute angle and a farther diftance. There is another way men- tioned by others, by which we are faid to perceive diftances when we look only with oneeye. And that is, the greater or lefs divergency of the rays which fall on the eye, that point being judged neareft which is feen by the mott di- verging rays, the apparent diftance increaling as the di- vergency of the rays decreafes, until the diftance is {o great that the rays which fall on the eye are to fenfe parallel. This mode of judging is not derived from experience, but from the difference of angular impreflions made by diverging and nearly parallel rays; it being a certain neceilary truth, that the nearer the direct rays falling on the eye approach to parallelifm, the farther off is their point of interfe¢tion, or the vifible point from which they flow. Such are the com- Mion opinions concerning our perceiving diftances by fight. Thofe which make no allowance for the interference of detent formed by experience, appear to us inadmiffible. ith qll the advantages derived from experience, our judg- ment of diflances is {ill imperfe&t, owing to the deceptions - arifing from the apparent magnitude compared with the real, from the uncertainty attending the intentity of the colours, the appearance of the minute parts of the object, and its relative fituation with regard to others. Thefe are the prin- cipal means of direGting our judgment, and if they be im- perfect, or any of them deficient, an error in judgment will be the probable confequence. If we judged of diftance by magnitude only, we fhould be led into numerous errors; it is by confidermg the other qualities of the object, and its fituation with regard to others, that we are led to forma correct judgment as to its real diftance. We know that a man equal to us in fize, appears {mallera hundred yards off, and fmaller {till at five hundred, Here, being certain of the real fize, we can make ufe of it with tolerable accuracy in determining the diftance. We are deceived, when unac- quainted with the real magnitude, we draw conclufions from the apparent only. We know by experience that objects become paler, and more indiftin@, in proportion as they are remote. We know by a number of objets being interpofed betaveen ourfelves and the objeé& to which we particularly direct our attention, that the latter is at a certain diftance. Hence diftances at fea appear much fhorter than on land. It is only by combining the different fenfations, and the judg- ments arifing from them, that we can form an opinion any- wife correct. It is equally neceffary to have a recolleGion of the diftance of an object, when forming a judzment of its fize. It is poflible that we may judge of magnitude by the vifual angle, or by the fize of the image on the retina. But we mutt take into the account the conneétion between the magnitude or extenfion of the vilible obje¢t, and the fize as afcertained by the touch; the confufion or diftinétnefs of the image ; the faintnefs or intenfity of the rays, and their diveétion ; the figure, number, and fituation of objeéts ; and other circumftances that have been obferved to attend greater or fmaller tangible magnitudes. Experience is equally required to aid our judgment ef magnitude as of diftance. By fight we can diftinguifh the quantity, the co- Tour, and the direGtion of the luminous rays which ftrike our eye: it is yet a matter of doubt how far the fight alone can convey ideas of magnitude or diftance. When judging from vifible appearances only, we are liable to many deceptions, which are extremely interefting, as they illuftrate the theo- ries of our different fenfations ; and there are many other circumftances, conneéted with the theory of vifion, which will be better confidered under the different heads of phyfi- cal optics. The phenomenon of accidental colours, or ocular {peétra, obferved long fince by Buffon, who gave an account of it in the Memoirs of the Academy of Paris, has fince been con- fidered at length by Dr. R. Darwin, and by many other writers, When a perfon, after looking long and attentively at a fmall bright obje&, removes his eyes, or clofes them, an image is full vifible to him, refembling in form that which he was attending to, but of a colour oppofite to the firft, that is, of fuch a colour as would be produced by with- drawing the firft from white light. Thus if a perfon look ftedfaftly, and for a confiderable time, at a {mall red fquare painted upon white paper, he will at laft obferve a kind of green-coloured border furround the red fquare. If he now turn his eyes to fome other part of the paper, he will fee an imaginary {quare of a delicate green, bordering upon blue, and correfponding exaétly in point of fize with the red {quare. his imaginary fquare continues vilible for fome time, and indeed does not difappear till the eye has viewed fucceflively a number of new objects. To this imaginary image the name of accidental colour was given by Buffon, and ocular fpeétrum by Dr. Darwin. If the obje& be yel- low, the fpeétrum is blue ; if green, red ; if blue, yellow ; if white, black ; and if black, the accidental colour is white, We may therefore fay, generally, that the reverfe fpectra are fimilar to a colour formed by a combination of all the primitive colours, except that with which the eye has been fatigued in making the experiment. The theory deduced from this remark is ingenious, and has much probability. The afligned reafon of the oppofite appearance is, that the portion of the retina that is affefted has loft a part of its {enfibility to the light of that colour with which it has been imprefled, and is more ftrongly affe&ed by the other con- ftituent parts of the white light ; fo that if we then regard a colour which admits in its compofition that which has fatigued Ex Er. fatigued the eye, the latter will ceafe to be vifible. Dr. Darwin divides ocular fpectra into four kinds: 1ft, fuch as are owing to a lefs fenfibility of a defined part of the retina, or fpe€tra, from defe& of fenfibility ; 2dly, fuch as are ow- jng to a greater fenfibility of a defined part of the retina, or f{pectra, from excefs of fenfibility ; 3dly, fuch as refemble their obje& in colour as well as in form, or direé&t ocular fpectra; and 4thly, fuch as are of a colour contrary to that of their obje&, or reverfe ocular fpeétra. He believes the retina to be in an ative ftate during the exiftence of thefe. In the firft cafe, the retina is not fo eafily excited into a€étion by lefs irritation, after having been lately fubjected to a greater. Inthe fecond, the retina is more eafily excited into action by greater irritation, after having been lately fub- jected to lefs. In the third, a quantity of ftimulus, fome- what greater than natural, excites the retina into fpa{modic action, which ceafes ina few feconds, or which ceafes and recurs alternately. In'the laft, the retina having been ex- cited into aétion much greater than natural, falls into oppo- fite {pafmodie aétion, or into various fucceffive fpafmodic aétions, or into a fixed {pafmodic adtion, which continues for fome days, or a temporary paralyfis is produced, the effects mentioned being fucceflively proportionate to the increafed timulus. He adds many mifcellaneous remarks on the fub- je&t in quettion, which tend further to illuftrate the pheno- mena by the contralt of the fenfations. Dr. Young thinks that the phenomena of the dire@t {petra may be better un- derftood from the analogy of coloured fhadows. There are many inftances related of an imperfeétion in the fight refpeét- ing colours, fome individuals being only able to tell black from white; others miftaking orange for green ; others to whom full greens and full reds appeared alike, while yellows and dark blues were nicely diftingnifhed. This has been afcribed to an infenfibility of the retina to particular colours. There are many other imperfections of fight which are not introduced here, as not immediately conne¢ted with the theory of vifion. The reader is referred for further information to a mott excellent catalogue of authors in the fecond volume of Dr. Young’s Natural Philofophy. The lift of references is too Jong to be introduced here, and is too complete to permit us to curtail it. The authors we have been principally indebted to are Zinn, Haller, Hunter, Soemmerring, Cuvier, Home, and, more particularly Young; to fome papers by Petit in the Memoirs of the French Academy, and to fome papers in the Gottingen Commentaries, by Wrifberg and Blumen- bach. Zinn’s defcription of the eye, with the fupplement of Wrifberg ; Soemmerring’s moft exquifite plates and his explanations, with Haller’s rich collection of facts and refer- ences to authors in the fifth volume of his Elementa Phyfio- logiz, are particularly worth confulting. Portal, in_his Tableau Chronologique d’ Anatomie, &c. tom. vi. has given along and very full deferiptive catalogue of authors who have written on the fubjeé of the eye, which contains much information. The comparative ftruture and enatomy of the eye are very curious; the fituation, number, conformation, &c. of this organ in different animals, being finely and wonderfully adapted to their different circumftances, occafious, and manners of living. In maw, and fome other creatures, an ingenious author obferves, the eye is placed chiefly to look forward; but withal is fo ordered as to take in nearly the hemifphere be- fore it. In birds, (See Birps) and fome other creatures, the eyes are fo feated as to take in near a whole {phere, that they may the better feek their food andefcape danger. In others they are feated fo as to fee behind them, or on each fide, whereby to fee the encmy purfuing them; thus, in hares and conies, the eyes are very protuberant, and placed fo much towards the fide of the head, that their two eyes take in nearly a whole {phere ; whereas in dogs that purfue them, the eyes are fet more forward in the head, to look that way more than backward. Generally, the head is contrived to turn this and that way chiefly for the oceafions of the eyes ; and generally the eyes themfelves are moveable upwards, downwards, backwards, and fidewife, for the more commodious reception of the vifual rays. Where nature deviates from thefe methods, fhe always makes ule of very artful expedients to anfwer the fame end. Thus, in fome creatures, the eyes are fet out at a diftance from the head, to be moved here and there, the one this way, and the other that ; asin fails, particularly, whofe eyes are contained in their four protuberances, like atramentous fpots fitted to the ends of their horns, or rather to the ends of thofe black filaments or optic nerves fheathed in the horn. Power, Exper. Phil. Obf. 31. And in other creatures, ‘whofe eyes or head are without motion, and in divers infects, that defeét is fometimes made up by their having more eyes than two; as in {piders, which having no neck, and confequently the head being immoveable, the defeét is fupplied by the fituation and mul- tiplicity of their eyes; fome having four, fome fix, and others eight, all placed in the fore-front of their head, which is round like a locket of diamonds. The reafon Dr. Power gives, is, that being to live by catching fo nimble and fhy a prey as flies, they ought to fee every way, and fo take them fer faltum, without any motion of the head to difcover them. Again, men, and moft quadrupeds, are found to have feveral mufcles belonging to their eyes, by help whereof they can turn them any way, and fo obvert the organ of fenfe to the obje€&t. But nature not having given that mo- bility to the eyes of flies, fhe in recompence furnifhes them with a multitude of little protuberant parts, finely ranged upon the convex of their large bulging eyes ; fo that by means of thefe numerous little ftuds numberlefs rays of light are deflected from objets placed on either hand, above or beneath the level of the eye, and conveniently thrown upon that organ, to cender the objeéts they come from vifible to the animal; and by the help of a good microfcope, and a clear fight, fome hundreds of thefe fittle round pro- tuberances may be difcovered, curioufly ranged on the con- vexity of a fingle eye of an ordinary fleth-fly. So fcorpions are found to have above a hundred eyes ; and Swammerdam has obferved no lefs than two thoufand in the little infe& called ephemeron. In other creatures the like deficiency is fupplied by hav- ing their eyes nearly two protuberant hemifpheres, each con- filting of a prodigious number of other little fegments of a fphere. : ‘ The eyes of a cameleon, Dr. Goddard obferves, refemble a lens, or convex-glafs, fet in a verfatile globular focket, which ke turns backward and forward without ftirring the head, and ordinarily the one a contrary way to the other. Laitly, the mole, which the ancients, Ariftotle, Pliny, Alb. Magnus, &c. fuppofed to have no eyes at all, is now found to furnifh a notable in{tance of the diverfity of the apparatus of vifion ; for that animal living altogether under ground, fight would generally be ufelefs to it, and fo tender a part as the eye troublefome. Jt has therefore eyes, but thofe fo exceedingly fmall, and withal fituated fo far in the head, and covered fo ftrongly over with hair, that they cannot ordinarily be of fervice or diflervice to it. Yet to_ guide —— oe “ EY E. guide and fecure it a little when it chances to be above- ground, Borrichius, Blafius, Schneidner, Dr. Derham, and others, obferve that it can protend, or put them forth be- yond the fkin, and again draw them back at pleafure, fome- what after the manner of fnails. In the eyes of noéturnal animals is a part not yet men- tioned, viz. a fort of tapetum at the bottom of the eye which gives a kind of radiation on the pupil, enabling them to fee and catch their prey in the dark. Thus, Dr. Willis, Flujus ufus eft oculi pupillam quafi jubare infito illumi- nare—quare in fele plurimum illuftris elt ; at homini avibus & pifcibus deeft.”” De Anima Brutor. He adds, that in fome perfons the iris has a faculty alfo of darting out light ; and inftances in a man of a hot head who, after a plentiful drinking of generous wine, could fee to read in the darkeit night. Ibid. The like Pliny tells us of Tib. Cefar, that upon his firft waking in the night he could fee every thing for a little while as if in broad day-light. (Nat. Hitt. lib. xi. cap. 37.) and Dr. Briggs gives a parallel inftance of a gentleman in Bedfordfhire. Ophthal. cap. v. § 12. Frogs, befides the parts of the eye which they have in common with men, and moft quadrupeds, have a peculiar membrane or cartilage, which is not commonly perceived, wherewith they can at pleafure cover the eye without too much hindering the fight; becaufe the membrane is both tranfparent and ftrong, fo that it may pafs for a kind of moveable cornea, or occafional fafeguard to the eye. A like membrane is alfo found in many birds, as alfo in the crocodile, Naturalifts relate wonders of the fharpnefs and accuracy of the eyes of fome animals, as the eagle, &c. beyond thofe of men. Yet do thofe of men feem improveable to a furprifing degree. Mr. Boyle inftances in a major of a regiment of king Charles I. who being afterwards forced abroad, ven- tured at Madrid to do his king a piece of fervice of an ex- traordinary nature and confequence; which being there judged very irregular, he was committed to an uncommon rifon or rather dungeon, having no window belonging to it, only a hole in the wall, at which the keeper put in provilions, and prefently clofed it again on the outfide, but not perhaps very exactly. For fome weeks this gentleman continued utterly in the dark, very difconfolate ; but after- wards began to think he faw fome little glimmering of light ; and this ane time to time increafed fo, that he could not only difcover the parts of his bed, and other fuch large objects, but at length, amidft this deep obfeurity, could perceive the mice that frequented his chamber to eat the erumbs of bread which fell upon the ground, and difcern their motions very well. The author juft mentioned, in his Obfervations on Vi- ‘tiated Sight, gives us fome uncommon phenomena that regard the eyes. He furnifhes feveral inftances of nyéta- jopies, or people whofe eyes in the day-time were quite dark, or at leaft fo dim that they could hardly difcern their way; who yet, foon after fun-fet, and during twilight, faw very clearly. Eve, drtificial, is the refemblance of a natural’ eye, formed either for the purpofe of fupplying the appearance of an eye ina perfon who wants one of thole natural organs; or for the purpofe of illuftrating the con{truétion, together with certain defe&ts, of the natural eye, deferibed in the next article.—The latter part of an artificial eye isa little machine which exhibits the principal parts, and the princi- pal offices of a natural eye. » From the defcription of the camera cbfcura, and from Vor, XIV. the anatomical defcription of the eye, it plainly appears that the latter is a moft excellent camera obfcura, having all the neceffary properties of it, toa mott admirable nicety. It is a globular dark reom, with one aperture for the admif. fion of light, with a lens and other media fit to form a pic- ture of external obje€ts on the hind part of its cavity, which is lined with a membrane called the retina. It has likewife all the neceffary adjuftments within certain limits; fuch as the power of adapting itfelf to the view of near as well as of diftant objeéts, the power of admitting more or lefs light, according to circumftances, and fo on. (See Vi- ston and Sicut.) If the eye of an animal, efpecially of a large fize, as that of an ox, be taken out foon after the death of the animal, and the fkin, fat, &c. be care- fuliy feraped off from the back of it, until a thin femi-tranf- parent pellicle remains, which is the retina, the eye fo pre- pared may then be ufed asa little camera obfeura; ox. if it be turned towards any objets, the figures of thofe obje@s will be feen depicted on the thin membrane juft mentioned, fo that the obferver being placed behind the prepared eye, may fee that picture very difltinéily. J In old perfons the humours grow thicker, and the parts lefs pliable, hence their eyes lofe in great meafure the power of adjufting themfelves. But, independent of old age, the eyes of certain perions can be adjufted for viewing diftant objects eafier than for near objects, and vice verfa. When the eye is defe@tive, and in conlequence of its fize or of other peculiar conformation, parallel rays form their foci before they arrive at the retina; then the perfon, who is poffeffed of iuch eyes, will be able to fee near objeéts only ; and {uch pertons are faid to be near-fighted, or myopes. When the eye is flatter than ordinary, then the foci of rays pro- ceeding from pretty near objeéts, are formed beyond the retina ; and fuch perfons as are poffeffed of eyes thus formed, are faid to be long-fighted, or prefbyte ; for they can only adjuit their eyes for viewing objects fituated beyond a cer- tain diftance ; the latter is generally the cafe with perfons advanced in age. Thefe imperfe€tions may in great meafure be correéted by the ufe of proper glaffes or fpeétacles; for fince in near-fighted perfons the rays of light converge to a focus before their ar- rival at the retina, a concave lens, placed before the eye, will remedy that imperfection, becaufe a concave lens dimi- nifhes the convergency of the rays of light, and, of courfe, will prolong the pencil fo as to enable it to converge exaGly on the retina. And for thofe who can fee diitant objeGs only with diftin@ion, that is, in whofe eyes the rays of light do not converge foon enough, convex lenfes, which increafe the convergency of the rays, will remedy the imperfection. Now the artificial eye we are treating of, ferves to illuf- trate the above-mentioned defeéts, together with the coer- rections by means of lenfes. In its moit improved tate of conftruéction, it alfo ferves to exhibit imitations of the prins cipal parts of the humaiy eye. The artificial eye is formed principally of glafs, and its parts are kept together by a brafs cell; but the thape and formation ot fuch a machise is, in fome meature, varied by almoit every workman. The part which re prefents the clobe of the eye, and its humours, is fixed ina focket, where it may be moved in any direction. The fore-part of the focket forms a fcreen to prevent the concurrence of fup fluous light ; but it has a hole in its middle, which is painted round fo as to repreient nearly ahuman eve. If this artificial eye be turned towards objeéts that are at a mode- rate diitance, their piture will appear very diitine?, but in- verted, upon the back part of the machine, where the rough furface of the glafs performs the office of the retina. The Te 2 YF. parts of this artificial eye may be examined in the following manner: unfcrew the focket which confines the ball of the eye and its parts; then the outermoft coat reprefents the {clerotica, the more protuberant part of which is the cor- nea. Next to this there is a plano-convex glafs lens to re- prefent the firft chamber of theaqueoushumour, under which there is a perforatéd flat piece of tortoife-fhell to reprefent the iris with the pupil, and under this there is another plano-convex lens which reprefents the fecond chamber of the aqueous humour. On removing the fecond coat, which reprefents the choroides, a {mall double and unequally con- vex lens will be found which reprefents the chryftalline hu- mour, and under this is a large piece of glafs which oc- cupies the remaining {pace of the machine, and reprefents the vitreous humour. The back part of the laft mentioned piece of glafs is made rough, fo that the pictures of ob- jects may be formed upon it, as upon the retina of a real eye. In order to reprefent the nature of vifion in long-fighted perfons, the ufual plano-convex lens, which reprefents the firft chamber of the aqueous humour in front of the artificial eye, muft be removed, and another fimilar lens, but lefs cone vex, mult be placed inftead of it. With this alteration, if the artificial eye be turned towards the fame objeéts, which before the alteration were reprefented dittinétly on the back of the machine, they will now form an indiltin& image upon the fame place, becaufe now the rays converge to a place more diftant than the back of the artificial eye. But if in this ftate a proper convex {petacle lens be placed before it, the image on the back of the artificial eye will be rendered perfect, which fhews the ufe of that kind of fpectacles to long- fighted perfons. In order to reprefent the imperfetion of fhort-fighted eyes, the plano-convex lens, reprefenting the firft chamber of the aqueous humour, muft be more convex than the original one. In this cafe then the focus of rays will fall fhort of the retina, in confequence of which an imperfect image of objects will be formed on the back of the artificial eye; but by placing a proper concave {pedtacle lens before it, the above-mentioned image may be rendered perfect. And this fhews the ufe of concave lenfes to fhort-lighted perfons, A fimpler conftrudtion of an artificial eye confifts of a globular brafs box, having a {mall rough glafs on its back, and a convex lens in front. This convex lens is fet in a brafs focket, which may be {crewed farther into, or farther out of the brafs box ; by which means the picture of obje&s on the rough glafs may be rendered imperfe& either by fcrew- ing the focket with the lens farther out, which imitates the fhort-fighted eye, or farther in, which fhews the imperfec- tion of long-fighted people; and the image may be rendered perfectly diitin@ by placing a concave f{pectacle lens in the firft cafe, or a convex one in the latter cafe, before the artificial eye. Eve, drtifcial, in Surgery. When fuppuratien takes place in the eye, the matter at length makes its way through the cornea, and efcapes together with the aqueous, and fome of the yitreous, humour; the tranfparent cornea is_in part deftroyed, while the reft continues in a ftate of opacity ; the pupil becomes clofed, the iris is adherent to the cornea, and the whole eye-ball fhrivels up in a greater or lefs degree. A total lofs of vifion, and great deformity of the counte- nance, are the evils neceffarily arifing fromall this mifchief. The firft of thefe confequences is quite incurable; the fecond may be obviated by the ufe of an artificial eye. Artificial eyes are concave little plates, adapted to the anterior half of the eye. Upon the middle of their front, convex, white furface, the tranfparent cornea, the pupil, and the iris, are imitated in the beft poffible manner, - When they are applied, what remains of the natural eye-ball lies in their pofterior excavated furface, They may be made either of glafs or enamel, Though fuch as are made of glafs anfwer tolerably well, yet they are apt to break, The enamel ones are not {ubjeét to this objection, and, as we -fhall hereafter explain more fully, their back edges may be made with the file better than glafs ones, for-lying conveniently in the orbit, In the choice of artificial eyes, for every kind of cafe, the furgeon fhould take care, that the contrivance refembles the natural healthy eye as much as poflible, in regard to the colour of the iris, the greater or lefler convexity of the cornea, the greater or leffer projection of the whole eye-ball from the orbit, and the more or lefs confiderable breadth of the globe of the eye between the external and internal canthius. Artificial eyes are conftru@ed of various fhapes and depths, Some are made of a long oval form, and thefe are found the moft eligible for perfons, whofe eye-lids have a long fiffure between them. Other artificial eyes are of a rounder fhape, and are proper in cafes, in-which the inter- {pace between the two eye-lids is fhort. Deep concave platesare to be chofen for patients, whoie eyes make a con- fiderable proje€tion forward; but flat ones are to be pre- ferred when the eyes are naturally fmall and deeply fituated in the fockets. Deep plates are alfo to be employed, when only a {mall part of the eye-ball is left ; but flat ones, when a contiderable portion remains. A principal obje& always confifts in endeavouring to render the refemblance between the artificial and natural eye, as complete as poflible, fo that the artifice may not be difcovered. When what remains of an eye, which has been deftroyed by fuppuration or difeafe, is of middling fize, the artificial eye can be applied with the greateft convenience, There is now fufficient room, confequently, no painful preffure is excited, and the inftrument does not lie too deeply in the orbit. Belides, the remaining part of the natural eye, which always retains fome degree of motion, and lies in the hollow of the artificial one, communicates to the latter a_ certain motion ; fo that, in this cafe, the deception becomes more difficult to dete& than in any other examples. When what remains of the natural eye is too fmall, or large, it does not enter into the hollow of the artificial one, and, confequently, the latter lies quite immoveable under the eye-lids, and the patient has the appearance of f{quinting in a much greater degree, than in the foregoing cafe. When the remaining portion of the natural eye has loft fo little of its original fize, that there is not room enough for an artificial one, an opening may be made into the eye-ball, a part of the vitreous’ humour let out, and thus fufficient room made for the artificial eye. ‘This operation is free from pain and danger; but, it occafionally happens, that the. vitreous humour colleéts again in its original quantity, fo as to deftroy the {pace for the artificial eye, and render 4 repetition of the puncture proper. When, from any caufe, the whole of the eye-ball has been: quite deftroyed, as, for inftance, when it has been ex- tirpated on account of fome cancerous affe&tion, the ufe of an artificial eye is hardly admiffible. For although the orbit, in this cafe, ufually becomes more or lefs filled u with flefh, which would ferve as a fupport to an artifici eye, yet the eye-lids generally lofe their natural power of motion, and fhrink up to the edges of the orbit, fo as not: to be capable of covering the artificial eye. Perhaps, how-: ever, this kind of contraétion of the eye-lids might be pre- vented, by filling the infide of thefe parts with lint, imme-. 2 diately EY £. diately after extirpating the eye, and keeping them approx- imated with ftrips of adhefive platter. The application and removal of an artificial eye are fo eafy, that the patient commonly foon acquires the art of put- ting it on and taking it off himfelf. The edge of the upper eye-lid is to be taken hold of with the thumb and index fin- ge of one hand, and drawn a little outward fromthe eye- all, while the artificial eye, which is to be previoufly moittened, mutt be pushed under the eye-lid with the other hand. This can be accomplifhed with moft eafe when the little corner of the artificial eye is firft puthed under the eye- lid. It then lies tranfverfely, and pufhesthe upper eye-lid fo high, that the lower edve of the artificial eye is fituated higher than the upper margin of the lower eye-lid. The lower cye-lid is now to be drawn a little outward with the finger, while the artificial eye is allowed to glide downward behind the part. When the artificial eye is to be taken off, it is only necef. fary to draw the edge of the lower eye-lid a little outward ‘with one of the fingers, and to introduce the blunt end of a needle under the lower margin of the artificial eye, which is now to be fomewhat raifed and prefled outward. When this is done, it immediately flips out of the orbit. The front furface of what remains of the natural eye is often uneven, forming a prominence in one place, and a ' depreffion in another ; confcquently the glafs eye fits clofer onfome parts than on others, and creates fuch painful fen- fations as oblige the patient to remove it. This inconve- mience may be obviated by taking off fome of the border of the artificial eye at the parts which fit too clofe, and make too much preffure, by means of a file, When the whole circumference of the eye fmarts after the ‘application of the glafs one, the plate employed is probably too deep, and the whole circumference of its edge makes too flrong preffure. In this cireumftance a flat plate muft ‘be applied. When, notwithitanding this plan, the eye continues painful, there is reafon for apprehending that the organ is in anirritable ftate. In this inftance, the bett way is to take off the inftrument again, and bathe the eye well with cold water, or fore atfiringent collyrium. After “a time, the eye-ball generally becomes capable of bearing the preffure of the artificial eye, without any unceaii- ‘nefs. However, fome patients are fo irritable, that they ean never wear an artificial eye without fuffering pain, and fuch perfons ought to be advifed to give up the intention altogether, It is obvious, that, in every example in which the eye “has been deftroyed by fuppuration, no idea fhould ever be entertained of ufing an artificial eye, before all inflammation and tendernefs of the organ have been quite removed. Alfo, ‘the ufe of thg artificial eye muft always be difcontinued, whenever an inflammation is brought on by any accidental caufes. Perfons fhould be recommended always to keep by them “More than one artificial eye of the fame kind, in cafe one fhould ever happen to be loft. It is alfo advifeable to take offthe artificial eye once every day, and cleanfe it, and par- ‘ticularly the orbit, from all kinds of dirt, mucus, &c. _ Want of attention of this kind is frequextly the caufe of fuch _inflammations, as compel the patient to difcontinue the ufe of ‘an artificial eye for a confiderable time. See Richter’s An- > fahgsgroade der Wundarzneykunit ; Band 3. _ Eys, Cancer, and Extirpation of. Tt becomes indifpen- fably neceflary to remove the eye-ball in feveral kinds of ‘ cafes, as, for inftance, when the organ protrudes from the “orbit, and cannot be reduced. The operation is alfo requi- Site for fome ulcerated ftaphylomas, and for every kind of cafe in which the coats and humours of the eye are fo dif- eafed, as not to admit of being reftored to a natural ftate, and in which the affeétion, if left to itfelf, would be likely to be communicated to the orbit. i Cancer of the eye, however, is the chief diforder, which creates a neceflity for the performance of the opera- tron The eye may beeome affeGted with cancer in three differ- ent manners. Sometimes the globe of the eye acquires an irregular kaotty fhape, and enlarges to the fize of an apple. The fight is gradually deltroyed, the blood-veffels in the white of the eye are varicofe, and the whole of the mternal and external ftruéture of the organ is fo altered, that the part looks like a piece of flefh, and no veltizes of the origi- nal organization are any longer perceptible. Sometimes, a {mall remaining portion of the tranfparant cornea is exter nally obfervable ; and, in certain cafes, a little aperture may ftill be feen within, through which the remainder of the vi- treous humour and choroid coat is difecoverable. Some- times a feetid fluid is difcharged from the difeafed organ, an ulcerated opening into the part having occurred. Occafion- ally, no ulceration whatever can be noticed, and the eye- ball refembles a firm piece of flefh. ‘The patient commonly experiences at firft burning pains in the eye, which, how- ever, are not in an infupportable degree ; but, at laft, they become of a violent darting nature, and fhoot all over one-half ofthe head. The caufes of this diftemper are- involved in corfiderable obfcurity. A German furgeon, named Vogel, mentions, that the difeafe is fometimes brought on by the fmall-pox. The foregoing form of cancer of the eye is the principal, and mot frequent one. Sometimes excrefeences make their appearance upon the front furface of the eye, and moft frequently upon the tranf- parent cornea. Such tumours often admit of being eradi- eated with the knife, ligature, or cavitic. In certain in- ftances, however, they always grow again after the employ- ment of thefe means, and become larger, more malignant, and even cancerous. At length, they ‘change into a fun- gous growth, which is extremely painful, covers all the an- terior part of the eye, and renders the operation of removing this organ abfolutely neceffary. Such 1s the fecoud form in which cancer of the eye prefents itfelf. On feveral occafions ulcers are produced upon the fore- part of the eye, and although a great many of them may be cured by the ufe of external and internal remedies, they are often exceedingly obftinate, dettroy vifion, and acquire fo malignant a flate, that they may very well be called cancerous. This is the third fpecies of cancer, which makes the extirpation of the eye requiiite. With regard to the treatment of every cancerous kind of difeafe, affecting the eye, we have a choice of three dil ent methods. We either plainly difcover fome particular determinate caufe, and employ meafures calculated for its “removal ; or the malignant character of the fymptoms leads us tohave recourfe to the remedies ufually preferibed for carcinomatous difeafes; or elfe, when both thefe plans fail, we proceed to put in practice the extirpation of the ey What is commonly called a cancer of the eye does not feem to be nearly fo malignant as the fame fort of difeafe in the breaft ; for the operation almoit always accomplifhes a radi- cal cure, as long as the diftemper is confined to the globe of the eye, and the eye-lids, cellular fabttance, and bones of the orbit continue unaffe&ed. The knowledge of this cir- cumitance fhould lead us to undertake the operation in good time, and-we can the more readily make up our mind to perform it, fince the power of feeing is, in all thefe cafes, irrecorerably loft. When the patient fuffers violent F 2 head. e. EY £. head-achs, and pains in other parts of the body, when his glands in different fituations are in an indu- rated flate, when the eye-ball has burft, and it difcharges a feetid matter, and when the eye-lids are red, fwollen, and painful, the event of the operation muft be confidered, as at leaft very doubtful. In the performance of the operation there are two im- portant circumttances, to which attention ought to be paid. The firft is to remove every particle of the difeafe, and Jeave none of the affected parts behind. ‘The fecond is to avoid doing any injury to the periofteum and bones of the orbit, The periofteum, in this fituation, lies fo near the dura mater, that the confequences of any mifchief done to the firft membrane, may eafily extend to the latt ; aid the bones of the orbit are in moft places fo thin, that they cannot be pierced, or broken; without a rifle of in- juring the brain, which is fituated immediately behind them, It is on this account that fome furgical writers have recom- mended, for the performance of this operation, inflruments which have no points. A man, endued with a very mode- rate fhare of dexterity, however, may certainly ufe a point- ed knife forthe purpofe both with fafety and advantage. In order to be able to feparate the eye-lids far enough from each other, it is fometimes recommended, in the firft inftance, to make an incifion through them at their external commiffure. An afliftant is to raife the upper eye-lid as much as poffible towards the fore-head. Some authors alfo advife us to introduce through the eye-ball a ligature, with which the part may be drawn to one fide, or the other, during the operation. We cannot conceive, however, that there can be any real occafion for this painful proceeding, nor for the employment of any kind of hook, with a fimilar intention, fince any operator poflefling common adroitnefs may eafily fucceed in drawing the globe of the eye forward with his fingers, as foon as it is detached, from its connec- tions within the orbit. In this operation, furgeons have fometimes made ufe of a {calpel curved fideways, and a pair of {ciflars of a fimilar fhape, with which inftruments it has been fuppofed that the parts behind the globe of the eye can be more conve- niently cut, than with any ftraight ones. But many of the beft operators prefer a ftraight inftrument, and find no inconveniences attending its ufe. The furgeon fhould firit divide the conjuné&iva conneéting the eye-lids with the eye-ball, and this ought to be done both above and below. Then the nerves and mufcles of the eye are to be cut on all fides of the organ; a part of the operation fometimes effected with crooked fciffars, though, as we have already obferved, it may be as well done with a common ftraight fcalpel. When a ligature is introduced through the front of the eye ball, or when a hook is ufed, the furgeon, by fuch means, is always to draw the globe of the eye in that direction which will give moft room on the fide where the parts are to be cut. But we confider the employment of a ligature, or hook, for the purpofe of pulling the globe of the eye in this manner, quite unnecef- fary, and therefore improper. Richter takes notice, that as the enlarged eye for the mott part lies clofe to the cheek, and it is frequently very difficult to make an incifion into the orbit, between the eye- ball and lower eye-lid, the operation may often be more eafity accomplifhed by firlt feparating the upper eye-lid from the difeafed organ; then cutting from above downwards more deeply into the orbit, fo as to divide the mufcles above and at the fides of the eye; and, laftly, detaching the eye-ball from itsconneétion with the lower eye-lid. ‘This mode of operating is, according to Richter, the more eafy, becaufe the globe of the eye can always be more readily inclined downwards, fo as to make room aboye, than it can be pufhed in the dire&tion upward for the purpofe of making room below. Until the optic nerve has been divided, the operator muft avoid drawing the eye-ball too forcibly forward, As foon as the eye has been completely detached, all the infide of the orbit fhould be very carefully examined with the finger, and whatever indurated parts are difcoyered ought to be diligently removed. In certain inftances, it is proper and prudent to cut away one, or both eye-lids, when affected with cancerous difeafe. Surgical writers alfo feem univerfally to agree about the propriety of always removing the lacrymal gland, as it is particularly apt to be the fource of fuch fungous excrefcences as are to be apprehended after the operation, Let the parts, however, be taken away with the utmoft flaill and caution, ftill the event of the operation is invaria~ bly to be regarded as extremely doubtful, when the adja- cent parts participate in the difeafe with the eye-ball, The bleeding is feldom of any importance, generall {topping as foon as the orbit is filled with foft lint. The inflammatory fymptoms and fever are alfo feldom fo violent - as to require any antiphlogiftic means, except a low diet, and keeping the bowels well open. During the fuppuration, the orbit becomes filled with healthy granulations, and the procefs of cicatrization muft be regulated by the fame principles, which are obferved in the treatment of common wounds. When the cure is complete, an artificial eye can feldom be worn, on account of the manner in which both the eye-lids fhrink, and contraé&, to the upper and lower margin * of the orbit. It is true, an attempt may be made to pre- vent fuch contraétion of the eye-lids, by ufing a bandage and {trips of {ticking plafter to keep thefe parts together, after the orbit is filled with lint. However, notwithftanding our be{t endeavours, it muft be confefled, that an artificial eye can feldom be made ule of after the operation. Sometimes the granulations, which form in the orbit, are flabby and indolent, in which circumftance fome mild aftringent fhould be applied, as for inftance, lapis calamina- ris, pulvis myrrhz, alumen uftum, &c. In fome examples, the granulations acquire a fungous and malignant nature, in which event they fhould either be cut away with a {calpel,, or deftroyed with cauftic. Sometimes the fungus is continually reproduced, and at length occafions death. In fome cafes, as late as half a year, or even later, after the cure has appeared perfeét, a fungous excrefcence has arifen, and proved fatal. Occafionally head-achs, vomit- ing, convulfions, &c. followed by death, come on a few days, or weeks, after the operation. It is faid, that in cafes of this kind the cancerous diftermper has been dif- covered to have fpread to the brain, along the optic nerve, and to have excited induration and ulceration in that vifcus. When a fungous malignant excrefcence occurs on the cornea, there is no occafion to extirpate the whole eye. It is quite fufficient to cut off the anterior portion of the organ; for the bafe of the fungus feldom extends beyond the edge of the cornea. The operation may be effe&ted by making a puncture into the eye with a lancet, a little way behind the margin of the cornea, and then enlarging the wound all round by means of a pair of feiflars. Though the bafis of the excrefcence does not often extend into the white of the eye, yet, it is obfervable, that the coats of this organ, for a greater or lefs extent around the roet EY £. reot of the fungus, are preternaturally thick and {wollen, Hence, as foon as the operation is finifhed, we fhould at- tentively examine, whether the coats of the eye, in the place where the incifion has been made, are in a natural flate, and fhould any part not feem to be fo, it ought to be cut away. Eye, Contufions of the. See OPHTHALMIA. Eve, Difea/es of the, are an ophthalmia, or inflammation of the eyes; the gutta ferena, or amaurofis; a fuffufion, or cataract ; an e€tropium ; a glaucoma; an amblyopia, or obfcurity of fight, including the myopia, the prefbytopia, the nytalopia, and the amaurofis ; the {trabifmus, or fquint- ing ; an unguis pannus, or pterygium of the membrane of the eye ; the albugo, leucoma, or {pot in the eye; a fugilla- tion of the eye; anepiphora, or rheum in the eyes; a tri- chiafis ; and the fiftula lachrymalis. See each defcribed under its peculiar denomination, See Warner's Deferip- tion of the human Eye, &c. with its principal Dileafes, &c. 2d edit. 1775. Eve, Falling out of the. See Protarsus oculi. Eyes, Running of the, in Infants. See Invant. Eyes, Scarification of the. Sec SCARIFICATION, Eve, Wounds of the. See Wounps. Eve of Birds. See Anatomy of Birvs. Eve of Fifhes. See Fisu. Eves of Flies. Every naturalift has cbferved, that the eyes of flies are of a reticulated texture ; and each reticulated eye of this kind is truly an affemblage of multitudes, often of many thoufands, of {mall but perfect eyes. The reti- culated eyes of flies are large, not only in proportion to the fize of the creature, but abfolutely, and in themfelves ; but the feveral fmall eyes of which they are compofed are re- markably minute in comparifon of thofe of the butterfly clafs, Many of the butterfly clafs have in each of their reticu- lated eyes many thoufand fmall eyes; but the fly clafs greatly exceed them in number of thefe, as many of the eyes of thefe are three times as large as thofe of the butter- flies; and befides, that each finaller eye is vaftly more mi- nute than the {mall eyes of the butterflies. Mr. Hook computed 14,000 hemifpheres in the two eyes of a drone; Mr. Lewenhoeck reckoned 6236 in a filk- worm’s two eyes in its fly-ftate; 3181 in each eye of a beetle ; and 8000 in the two eyes of a common fly. The pearl-eyes of the dragon-fly appear with a common reading- glafs like fhagreen ; and Mr. Lewenhoeck reckons in each eye of this infect 12,544 lenfes, placed in an hexangular penton, each lens having fix others round it. He alfo ob- erved in the centre of each lens a minute tranfparent fpot, brighter than the reft, fuppofed to be the pupil, furrounded with three circles, and in appearance feven times lefs than the diameter of the whole lens. Mr. Puget counted £7,325 in the eye of a butterfly, which Malpighi concludes to be diftin& and feparate eyes. The abbé Catalan, and others, have fince fhewn, that all the eminences difcoverable in the cornea of infects have the neceflary parts, and perform the offices of an eye. Lewenhoeck tiated the bundles of optic nerves which ferve thefe {mail lenfes; and Reaumur Pree et thefe fupply the place of all that is wanting behind the lenfes, for the organization of an eye complete for vifion, Baker’s Micr. 1743, p. 228. Reaumur, Hiit. Inf. vol. i. p. 261, &c. See Enromotocy. Eves of Poe in the Manege, &c. Thefe fhould be bright, lively, full of fire, pretty large, and full; but not too big, gogling, or ftaring out of the head: they fhould alfo be refolute, bold, and brifk. A horfe to appear well, fhould look on his objeét fixedly, with a kind of difdam, and not turn his eyes another way. In the eye of a horfe are difcovered his inclination, health, and indifpofition. When the eyes are funk, or the eye- brows are too much raifed up, and asit were {welled, itis a fign of vicioufnefsand ill nature. When the pits above the eyes are extremely hollow, it is for the moit part a certain fign of old age: this, however, does not hold of horfes got by an old ftallion; for thefe have them very deep at the age of four or five years, as alfo their eye-lids and eye- brows wrinkled and hollow. Two things are chiefly to be confidered in the eye of a horfe, viz. the chryftalline part, and the bottom or ground, The chryttalline, or moft tranfparent part, fhould, for clearnefs, refemble a piece of rock-cryltal, otherwife the eye cannot be good. When this part is reddifh it is a fign that the eye is inflamed, or elfe, as forme pretend, influenced by the moon. When it is of the colour of a withered or dead leaf upon the lower part, and troubled on the upper, it infallibly fhews that the horfe is lunatic, which diftemper contivues no longer than while the humour actually poffeffes the eye. As to the ground or bottom of the eye, which is pro- perly its pupil or apple, it fhould be large and fall, and ought to be carefully infpeGed, that there be no dragon, as it is called, on it. hisis.a white {pot orfpeck, which at firit appears no bigger than a grain of millet, but grows to fuch a bignefs as to cover the whole apple of the eye: it is incurable, never failing to make a horte blind in the eye where it is found. If the whole bottom of the eye be white, or of a tranfparent greenifh white, it isa bad in- dication, though perhaps the horfe is not as yet quite blind : however, it ought to be obferved, that if you view a horfe’s eyes when oppofite to a white wall, the reflection of it will make their apples appear whitifh, fometimes in- clining to green, though they be really good. When this is perceived, you may try whether his eyes have the fame ap- pearance in another place. In cafe you perceive above the bottom of the eye, as it were, two grains of chimney-foot fixed thereto, it isa fign the chryftalline is tranfparent ; and if, befides this, the faid bottom be without a {pot er whitenefs, then you may infer that the eye is found. You ought alfo to examine whether an eye which is trou- bled and very brown be lefs than the other ; for if it be, it is irrecoverably lott. All eyes which are {mall, narrow, and have long pupils, run a greater 1ifk of lofing the fight than any others. See Buinpyess. The difeafes of the eyes in horfes proceed either from a defluxion, or from fome external hurt. In the former cafe the eyes are watery, hot, red, and fwollen, the diftemper advancing by degrees; in the latter the malady comes fpeedily to a height, and the fkin on the outfide of the eye is peeled off. If the diitemper take its rife from a rheum or defluxion, it is to be confidered whether it proceeds from the eye itfelf, or from another aggrieved part: in the latter cafe, the redre fing of the part will fet the eye free; in the former, itis proper to cool the horfe’s blood with an ounce of {fal pruncllx, mingled every day with his bran; and when it leffens his ap- petite, to change it for liver of antimony till he recovers his ftomach. For fore eyes, where a {kin is growing over them, the following receipt is recommended: to the white of an egg add a little fine powdered falt; then fet this on the fire till r YE. till it be reduced to a powder, This, mixed with a little honey, is to be put into the horfe’s eye with a feather. Tf it is found infufficient to eat off the fkin, the powder alone mutt be blown into the eye with a qu ll. In cafe of a blow on the eye, take honey, and having added a fmall quantity of powder of ginger, put it into the horfe’s eye; or elfe take hog’s lard, with the oil of rofes and elder, of each an equal quantity ; then, having melted them together, anoint the eye therewith. Some horfes have naturally tender weeping eyes, which void a fharp eating humour; thefe are eafily cured, by wafhing or bathing them every morning or evening with prandy. See Horse. ere We fay alfo, “a horfe unfhod ef one eye,’”? which is a yallying expreffion, importing that he is blind of an eye. Eve of the Branch of a Bridle, is the uppermott part of the branch which is flat, witha hole in it, for joining the branch to the hea¢-ftall, and for keeping the curb fait. Eve of a Bean, isa black {peck or mark in the cavity of the corner teeth, which is formed there about the age of five and a half, and continues till feven or eight ; and it is from hence that we ufually fay, fuch a horfe marks {till, and fuch a one has no mark. Eyvx-Flaps, thofe pieces of leather which cover the eyes of coach horfes. Eve, Altitude of the. See Avrirupe. Eve, in Architedure, is ufed for any round window made in a pediment, an attic, the reins of a vault, or the like. Eyes, Bullock's, Ocil de beuf, denotes a little fky-light in the covering or roof, intended to illumine a granary, or the like. The fame term is applied to the little tlutherns ina dome ; asin that of St. Peter’s at Rome, whieh has forty-eight in three rows. See LuTHERN. Eye of a Dome, denotes an aperture at the top of the dome; as that of the Pantheon at Rome, or of St. Paul’s at London. It is ufually covered with a Tantern. See Dome. Eve of the Volute, is the centre ot the volute, or that point wherein the helix or {piral whereof it is formed commences ; or it is the little circle in the middle of the wolute, wherein are found the thirteen centres for de- fcribing the circumvolutions thereof. - Eye, in Gardening, a term which in the management of fruit-trees fignifies the {mall bud or fhoot which is to be inferted into anothestree. See Bup and Buppinec. It alfo fignifies the fmall pointed knot to which the leaves adhere, and from which the fhoots {pring forth. The eye ef a pear denotes the extremity cppolite to its ftalk. _ Eye, in Geography, a town of Norway; 36 miles S. of Bergen. Eye, a market and borough town of Suffolk, England ; is fituated in the hundred of Hartifmere, at the diftance of 20 miles from Ipfwich, and 90 from London. It is feated in a valley, and is almoft furrounded by a brook, which gives name to the place. Asa borough it was firit incor- porated by king John, from whofe charter, and fome that have been fubfequently granted, it derived feveral pri- ‘vileges, but many of thefe have latterly been difcontinued. The borough did not return members to parliament tll the thirteenth year of the reign of queen Elizabeth, fince which period it has fent two. The right of eleétion is yefted in the free burgefles, corporation, and thofe inha- bitants who pay ‘ fcot and Jot :”” a number amounting to ’ about 200. The éarl of Cornwallis is patron, or pro- . prietor of the borouch, and thereby has the power of controlling the elections. Ia the reign of king William I. a priory for Benedi€tine monks was founded here, and in the time of king Edward III. an hofpital for lepers. The ftreets are moftly narrow, The church isa large, handfome building. In the year 1801 the town confifled ef 300 houfes, and contained 1734 inhabitants. There is a weekly market on Saturdays, and aw annual fair, It has a fmull manufacture of bone-lace; and fome of the inhabitants are occupied in {pinuing. Kirby’s Suffolk Traveller. Eys, a river of Scotland, which rifes in the north-weft part of Berwickfhire, and falis into the North fea, at Eyemouth. Eye is alfo ufed among Jezwellers for the luftre and brilliance of pearls and precious ftones, more ufually called the water. . Eyer, among Naturalifs, is fometimes alfo ufed for a hole or aperture: whence it is that the firlt of the larger inteftines is called cecum, or the blind gut, as having no eye or perforation. For a like reafon the chemilts call a clofe veflel, ufed in diitillation, a blind head. Eye, in Per/pedive. See PERSPECTIVE. Eye, in Printing, is fometimes ufed for the thicknefs of the types and charaéters ufedin printing ; or, more ftridily, it is the graving in relievo on the top of the latter; other- wife called its face. It is the eye or face that makes the impreffion ; the reft, which they call the body, ferving only to fuitainit. The eye of the cis the little aperture at the head of that charaGter, which diftinguifhes it from the «. See E. Eye, in a Ship. The hole wherein the ring of the anchor is put into the fhank is called the ‘ eye of the anchor ;”? and the compafs or ring which is left of the ftrop to which any block is feized, is called the “ eye of the ftrop.” Eye of a Stay, is that part of a ftay which is formed into a fort of collar to go round the maft-head. Eve-Bolt, is a long bar of iron with an eye in one end of it, formed to be driven into the decks or fides of a fip for divers purpofes, as to hook tackles, or faften ropes to, as oceafion requires. Eve-/et-Hole. See Sart. Eves of a Ship, a name frequently given to thofe parts which lie near the haufe holes, particularly in the lower apartments within the veffel. Evye-Bright, in Botany. See EupHRasia. Evye-Brows. See Eye, in Anatomy. Eye-Brows, wounded. See Wounps. Evr-Brow, in Archite@ure. See Firvet. Eys-Glafs, in our Double Microfeopes, is ufually a lens convex on both fides; but Euftachia Divini long fince in- vented a microfcope of this kind, the power of which he places very greatly above that of the common fort ; and this principally depending on the eye-glafs, which was double, contilting of two plano-convex glaffes, fo placed as to touch one another in the middle of their convex furface. This inftrument is fpoken of with great credit by Fabri in his Optics, and is faid to have this peculiar excellence, that it {hews all the objeéts flat, and not crooked, and takes in a large area, though it magnifies extremely much. Phil. Tranf. No. 4o. Eye-Gla/s, in Tek/copes, is the lens nextthe eye; and if the telefcope confift of more than two lenfes, all but that next the objet are called eye-glafles. 5 Eve-lids, Encyjled tumours of, in Surgery. Encyfted tu- mo} urs BY 8 mours frequently form on the eye-lids: indeed, this is fo much the cafe, that fome furgical writers affert that fuch {wellings are more often found fituated on thofe parts than any where elfe in the body. ; ; We fhall not fiop to refute the opinion which has occa- fionally ftarted up, that the frequency of encyfted tumours on the eye lids arifes from the great number of febaceous glands exiiting in thefe parts, which glands have been fup- pofed to {well and enlatge from fome caufe or another. Scarpa points out, that the glands of Meibomius are only fitnated at the edges of the eye-lids, and that encyfted tu- mours are not more common on this part of the eye-lids than on others. Scarpa remarks, that an encyfted tumour of the eye-lids, in its early ftate, doesnot exceed a millet-feed or a fmall pea in fize, and that it is long before a {welling of this kind be- comes as large as a bean or filbert. ‘The tumour is in gene- ral unattended with pain ; but fome uneatinefs is experienced as foon as the difeafe has acquired fuch magnitude that the free motion of the eye-lid, a partial depreflion of it, anda decree of preffure on the eye-ball, are produced. Scarpa expreffes a conviction, founded on the obfervation ef numerous cafes, that thefe tumours are, from their firft origin, moft commonly nearer to the internal membrane of the eye-lids than to the integuments, their bafes being fo fuperficially fituated on the inner furface of the eye-lids, that, when fuch furface is turned outwards, the {wellings feem quite denuded, and look tran{parent through the deli- cate lining of the palpebre. Various applications have been tried, with a view of dif- perfing encyfted tumours of the eye-lids; as, for in{tance, collyria, containing the aqua ammonia in a very diluted fiate, refolvent gums, mercurial frictions, &c. Scarpa oblerves, however, that he has found fo little fuccefs attend the ufe of thefe remedies, that, he is convinced, the only effectual mode of cure, particularly when the tumour is of long ftand- ing, confifts in having recourfe to extirpation. A furgeon, who adopts Scarpa’s opinion, naturally de- cides, that the beft way of removing encylted tumours of the eye-lids is, generally {peaking, to extra& them through an incifion made on the infide of the eye-lid. The reafons urged by Scarpa, in favour of this praétice, are, that the wound need only be a very fuperficial one, the cyit may be eafily feparated from the furrounding parts, the place readily heals, and no {ear is left to denote either that there has been any difeafe or operation. Scarpa allows, however, that there is one cafe in which this plan of operating fhould not be chofen, When the encyfted tumour is fo fituated upon either eye-lid that the part cannot be fufficiently turned infide-out, to bring into view the bafe of the fwelling, and to enable the furgeon to cut away the whole of it, the cut fhould be made from without. ; When the encyfted tumour is on the upper eye-lid, the patient being feated with his head firmly fupported, an af- fiftant is to turn out the upper eye-lid, and prefs in fuch a manner as will make the tumour projeé as much as peflible. The furgeon is next-to divide, with a lancet, or convex- edged fcalpel, the- delicate membrane {pread over the tu- mour. Hes to obferve to make the mcifion in the direction of the edge of the eye-lid, and of fufficient fize to allow the _ tumour to projeét and be taken out with eafe. The {welling » may now be taken hold of with a pair of forceps, ora tenta- culum, and detached from all its connections with the knife, or, as fome may prefer; witha pair of fciflars. The eye-lid is then to be put into its natural pofition again, and kept wet with linen dipped in the faturnine lotion, iB The operation on the lower eye-lid is net materially dif- ferent from the one already defcribed. When an encyfted tumour is to be removed from the eyes lid of a child, Scarpa advifes the child to be laid ona table, with the head raifed on a pillow, and the hands and feet firmly held by affittants. In quadrupeds the lower palpebra is moveable, and is the {maller ; in birds, on the contrary, the lower is moveabie, and tke greater. Animals that have hard eyes, as lobflers, and the gene- rality of filhes, have no palpebre, fuch eyes being fufficiently fecured without. In the generality of brutes there is a kind cf a third eye- lid, which is drawn like a curtain, to wipe off the humidity which might incommode the eyes ; it is called the nictitat- ing membrane. The monkey is almoft the only one that wants it, as being furnifhed, like a man, with hands to wipe the eye on occation. Evye-lids, Wounded. See Wounps. Eve, Bulls, in Afironomy, a ttar of the firft magnitude, in the conitellation Taurus, by the Arabs called Alde- baran. Eye, Cat’s, Oculus cati, in Natural Hiftory, a precious ftone, called alfo /un’s eye, oculus folis, and taken by Dr, Woodward for the afterias of the ancients. See Car’s- eye. Eve, Crab’s, Oculus cancrorum. See Crabs-eyes. Eve, Goat’s, Oculus caprinus, is when there is a white {peck on the pupil of the eye, asis feen in the eyes of goats. Phyficians call it egias. Eye, Golden, in Ornithology. See Duck. Eye, Hare’s, Oculus leporinus, in Surgery, a difeafe arifing from a contraction of the upper eye-lid, which prevents its. being able to cover its part of the eye, fo that the patient is obliged to fleep with the eye half open, after the manner of hares. Phyficians call it Jagophthalmia, a Greek word fignifying the fame thing, being compounded of Aawya:, hare, and oP Sarr roc, eye. EYEABLE, in Rural Economy, is 2 provincial term ufed to denote the fine appearance of colleétions of fheep and neat cattle. EYEMOUTH, in Geography, a {mall fifhing town in the fhire of Berwick, having a good harbour for {mall craft at the mouth of the river Eye. In the reign of Elizabeth the French took poffetiion of it for the queen mother, and fortified it, as being a convenient port for landing fupplies. But queen Elizabeth fupporting the caufe of the reformers, the French were foon obliged to quit the country. A con- fiderable herring fifhery occupies the inhabitants. In 179% fix buffes only were employed, but there is abundance of room for numbers more, as the coaft abounds with various kinds of fifth. In 1756 the harbour was improved by the erection of a new pier on the wettern fide, and ia 1770 ane other on the eaftern fide-was added ;._ fince which the trade has inereafed, and much corn and meal are annually expoited. It has two annual fairs in June and October, and is fituared nine miles north by weit of Berwick, and 349 miles from London. Sir John Sinclair’s Stat. Acc. of Scotland. EYERDORTP, a town of Germany, ‘in the priacipality of Wurzburg; five miles $.S.W. of Kiffingen. EYERHEIM, a town of Germany, in the principality of Wurzburg; feven miles E.S.E. of Schweinfurt. EYERtLANDT, an ifland at the entrance into the Zuyder fea from the German ocean, N. of the Texel, about 2 miles in length, and half a mile wide; joined to the ifland EYN ifland of Texel by a bank of fand, and overflowed only at high water. EYESS, in Falconry. See Eyriz and Farcon. EYETON, or Ayton, in Geography, a town of Scot- land, in Berwickfhire, feated on the river Eye; feven miles N. of Berwick-upon-Tweed. EYFERDING. See Errerpine. EYGUEL, a river of France, which runs into the Sarre; five miles N.E of Sarre Alb. EYGUIE'RES, a town of France, in the department of the Bouches, or Mouths of the Rhone, and chief place of a canton, in the diftri€ of Tarafcon ; 16 miles E.S.E. of Tarafcon; the place contains 2925, and the canton 7320 inhabitants, in feven communes and a territorial extent of 245 kiliometres. EYGURANDE, a town of France, in the department of Correze, and chief place of a canton, in the diftrié of Uffel; the place contains 991, and the canton 4667 inhabit- ants, ona territory of 180 kiliometres, in 10 communes. EYKENHOUTS Douster, in Conchology, the name of Venus macaffarica, in Leer’s Catal. EYLA, in Geography, a river of Saxony, which runs into the Wichra, two miles N. of Borna, in the margravi- ate of Meiffen.—Alfo, a town of Sicily, in the valley of Mazara; 25 miles E.S.E. of Palermo. EYLAND, a river of Brandenburg, which runs into the Oder; two miles S. of Frankfort. EYLANDEN, one of the fmaller Japanefe iflands. N. lat. 34° 45! E. long. 139° ro’. EYLAU, Drurscu, a town of Pruffia, in the province of Oberland; 42 miles E.N.E. of Culm. N. lat. 53° 30!. E. long. 19° 24'. Eyvau, Preufit/ch, a town of Pruffia, in the province of Natangen; 20 miles S. of Konigfberg ; famous for a bloody battle fought near it in February 1807, between the French and the Ruffians. N. lat. 54° 20’. E. long. 20° 42', ; EYLES’s Istanp, a {mall ifland in the Mergui Archi- pelago, near the fouth coaft of Sullivan’s ifland. N. lat. to” 46! EYLL, a river of France, which runs into the Roer, near Juliers EYME, a town of Germany, in the principality of Ca- lenberg ; 16 miles E. of Hameln, EYMET, a town of France, in the department of the Dordogne, and chief place of a canton, in the diltri& of Bergerac; 12 miles S. of Bergerac. he place contains 1332, aud the canton 5402 whabitants, in 14 communes, ona territory of 1224 kihometres. EYMOUTIERS, a town of France, in the department of Upper Vienne, and chief place of a canton, in the dif- tri of Limoges; 18 miles N. of Limoges. The place contains 1521, and the canton 13,159 inhabitants, in 16 communes, on a territory of 370 kiliometres. This town earries on a confiderable trade in dkins, leather, and rags. — Alfo, a town of France, in the department of the Dordogne; 15 miles N. of Perigueux. EYNDHOVEN, a town cf Brabant, fituated on the Dommel; 25 miles W. of Venlo. EYNON, ariver of Wales, which runs into the Dovic, about three miles below Machynlleth. EYNSHAM, a village of England, in the, county of Oxford, fix miles N.W. of Oxford, famous for a monaitery founded here by Athelmer, or Aylmer, earl of Cornwall and Devon, before the year 1005 3 and alfo for a council held here by king Ethelred, at which the archbifhops and bifhops of the realm attended, and many acts, ecclefiattical and civil, EY S$ any paffed. The number of inhabitants in 1801 was 1166. EYPEL, a town of Bohemia, in the circle of Konigin- ratz 3; three miles $.S.E. of Trautenau. EYPOLTAN, a town of Auitria, on the north fide of the Danube; five miles N. of Vienna. EY RAGUES, a town of France, in the department of the Mouths of the Rhone; eight miles E.N.E. of Tarafcon. EYRE, a town of North Carolina; 48 miles W. of Halifax. Eyrf, or /ré,a mountain of Africa, between Fezzan and Cafhna, i _Evre, or Eire, in Law, fignifies the court of juftices itinerant. The word feems formed of the old French, irre, iter, way, track. Hence juftices in eyre are thofe whom BraGton calls ju/fi- ciarii ttinerantes. See Justices in Eyre. Eyre of the Foreft, is otherwife called juflice-feat, which — by the ancient cuftoms was to be held every three years by the juftices of the foreft, journeying up and down for that purpofe. See Justrices. — EYRECOURT, in Geography, a poft town of the county of Galway, Ireland; 72 Ivith miles weft from Dublin, and about 34 eaft from Galway. EYRIE, or Ayriz, among Fa/coners, the neft where hawks fit and hatch, and feed their young. Hence a young hawk, newly taken from the nett, is called an eyefs. EYRON, in Geography. See Erron. EYSACH, a river of the Tyrolefe, which runs into the Adige, near Bolzano. EYSDALE, or Espace, a fmall ifland near the weft coaft of Scotland, celebrated for its quarries of excellent flate; feven miles S.E. from Mull. N. lat. 56° 18! W. long. 5188. EYSENBERG, a town of Pruffia, in Natangen; 20 miles S.S.W. of Brandenburg. EYSL, a town of Germany, in the principality of Anfpach; four miles N. of Thalmeffing. EYSTATHES, in Botany, wsaSn:, firm and flable, in allufion to the hard and durable nature of the wood. > Loureir. Cochinch. 234. Clafs and order, Ogandria Mono- gynia. Nat. Ord, Sapindi, Juff. ? Gen. Ch. Cai. Perianth inferior, of five ovate, concave leaves. Cor. Petals five, ovate, fpreading, the fize of the calyx. Stam. Filaments eight, awl-fhaped, erect, inferted into the receptacle; anthers ereét, ovate, of two cells, Pif, Germen fuperior, roundifh, hairy; ftyle thread-thaped, nearly as long as the ttamens; ftigma obtufe, notched, Peric. Berry globofe, flefhy, of one cell. Seeds four, ovate, comprefled, Eff. Ch. Calyx of five leaves, inferior. ovate. Berry of one cell, with four feeds. E. fylvefiris. Lour. 235. Native ot the lufty mountains of Cochinchina. A large tree, whofe wood is reddifh, even, firm, of an ample fize, fit for the purpofes of building. Branches {preading. Leaves alternate, ovate- oblong, pointed, entire, fmooth, veiny. Yowers white, in nearly fimple oblong clufters, about ‘the ends of the branches. Berry fmooth, with a hard fkin, pulpy in- ternally, of a middling fize, not eatable. = Such is Loureiro’s account. We know no defcribed treé to which his defcription is applicable. The number of feeds which he attributes to this genus, four inflead of three, renders its natural order doubtful. EYSTENEY, called alfo Ezfon-Ne/t, in Geography, isa 7 remarkable Petals five, EZE rematkable head-land in Suffolk, formerly accounted the moft eaitern point of the ifland, whence it received its Saxon, or rather Britifh, denomination. But fince the latitudes and longitudes of places have been more accurately afcertained by modern difcoveries, the ftatement has becn found erroneous ; part of the Norfolk coaft having a more cafterly bearing. This point was the EEOXH, or Lxtenfio Promon- zorium of the Roman geographer Ptolemy. ‘ And to put it out of doubt,” fays Camden in his Britannia, that it is the fame we call Eafton, it is to be obferved, that Lyf teney fignifies the fame in Britifh, as Efoxn in Greck, or Extenfio in Latin. Though the name in our language may be with as much probability derived from its ealtern fituation.”? (Vol. ii. Gough’s Edit. p. 76.) The pro- bability, however, is in favour of the Britith derivation. Dften or Ey/fen, m Celtic, means to extend, and Ay, prominent ; hence Eyitenhy, or Eyfteney, will fignify the extended pro- teétion, or bold promontory. Horfley places it at Gunfleet, in the county of Effex. EYTJOU-HOTUN, a town of Corea; 380 miles E. of Peking. EYWANOUITZ, a town of Moravia, in the circle of Olmutz; 16 miles S. W. of Olmutz. EZA, a town of France, in the department of the Maritime Alps; 4 miles E. of Nice. EZAGEN, a town of Africa, in Fez; 60 miles S. of Tetuan, EZAWEN, a town of Africa, in the country of Sahara; yo miles N. W. of Tombuétoo. EZDOUD, a town of Syria, on the fite of the ancient Azotus, or Afhdod, famous at prefent for its fcorpions. ‘This town, which was once fo powerful under the Philiftines, affords no proofs of its ancient importance. ‘Three leagues from Ezdoud is the village of El-Majdal, where they {pin the fineft cottons in Paleftine, which, however, are very coarfe. EZEKIEL, in Scripture Biography, one of the infpired prophets, whofe prediétions are recorded in the Old Tefta- ment. He was the fon of Buzi of the houfe of Aaron, and one of the captives carried by Nebuchadnezzar to Babylon with Jeconiah or Jehoiachin. The era at which he com- mences his prophecies was the fifth year of Jehoiachin’s captivity, or the fifth of Zedekiah, or the 593d year B. C. Jeremiah was his contemporary, and prophefied at the fame time in Judea. Ezekiel, after his captivity, inhabited fome place on the river Chebar, which flows into the Euphrates about 200 miles northward of Babylon; and this was the {cene of his predi&tions, though he was occafionally con- veyed in vifion to Jerufalem ; and his prophecies were con- tinued for about 22 years. ‘the events of his life, after his advancement to the prophetic office, are interwoven with the detail which he himfelf has given of his prediétions ; and the mamer of its termination is no where afcertained. LEpi- phanius, indeed, if he be the author of the life of this pro- phet that is afcribed to him, informs us, that he was put to death by the prince or commander of the Jews in the place of his exile; becaufe he was addi¢ied to idolatry, and could not bear the reproaches of the prophet. But on this ac- count, which is intermixed with many fables, we can, place no reliance. The fubjeGts of Ezekiel’s prophecies, con- tained in the canonical book of the Old Teftament, aring his name, are the dreadful calamities, foon after in- fli&ted upon Judza and Jerufalem, on account of the idola- try, impiety, and profligacy of their inhabitants; the di- vine 5 ele that would be executed on the falfe prophets and proplicteffes, who deluded and hardened the Jews in their rebellion againft God; the punifhments which fhowld Vou. XIV. E25 befal che Ammonites, Edomites, and Philiftines, for their hatred of the Jews, and for infuleing over them in their dif- trefs ; the deftrudtion of Tyre, which he places in the 26th year of the captivity of Jehoiachin, and alfo the congucf of Egypt in the fucceeding year, by Nebuchadnezzar; the fu- ture reftoration of Ifrael and Judah from their feveral difper- fions, upon their repentance and reformation ; and their ulti. mately happy ftate after the advent and under the govern- ment of the Meffiah. The prediGtions of Ezekiel are dif- tributed by Jofephus, and various other writers, into two books, or parts; the firft of which extends to the clofe of the 39th chapter; and the fecond, in which a new, more elevated, and joyful fcene is exhibited, begins with the goth chapter, and is comprehended in the laft nine chapters. Gro- tius {peaks in high terms of this prophet, obferving, § that he had great erudition and genius ; fo that fetting afide his gift of prophecy, which is incomparable, he may de- ferve to be compared with Homer, oa account of his beau- tiful conceptions, his illuftrious comparifons, and bis ex- tenfive knowledge of various matters, particularly of ar- chitecture.”” Bifhop Lowth, in his z1ft leéture on the fa- cred poetry of the Hebrews, gives us an admirable defcrip- tion of the peculiar and difcriminating charaéteriflics of this prophet. ‘ Ezekiel,” fays he, “is much inferior to Je- remiah in elegance ; but is equal even to. Iiziah in fub- lnnity, though their ftyle of compofition is very different. For he is bold, vehemerxt, tragtcal, wholly intent ‘on exagge- ration ; in his fentiments elevated, warm, bitter, indignant ; in his images fertile, magnificent, harfh, and fometimes al- moft deformed ; in his di¢tion grand, mighty, auttere, rouzh, and fometimes uncultivated, abounding in repetitions, not for the fake of ornament or gracefulnefs, but through in- dignation and violence. Whatever fubje@t he undertakes to treat of, he purfues it diligently, he remains entirely fixed on it, and rarely deviates from his purpofe ; fo that his reader is {carcely ever unable to difcern the fenfe and conneétion of his matter. Perhaps he is excelled in other refpects by moft of the prophets; but none ia the whole compafs of writers has ever equalled him in the manner of writing, for which he feems to have been fingularly qualified by nature, in force, impetuality, weight, and grandeur. His dition is fufficiently perfpicuous; almof all his ebfeurity lics in his matter: his vifions are particularly obicure ; and yet, asin Hofea, Amos, and Zechariah, they are iaterpreted by a narration, which is plain and altogether hiftorical. The greater part of Ezekiel, and what lies in the middle of his book, is poetical, whether we regard the matter or the di@tion: but heis for the moit part fo rude and void of compofition in his fentences, that I am often doubtful what to determine in this refpect.””? In another place the fame learned prelate remarks, that Ezekiel fhould perhaps beoftener ciafled among the orators than the poets ; and he thinks that, with refpe& to ftyle, we may juitly aflizn to Ezckiel the fame rank among the-Hebrews that A&fchylus holds among the Greeks, Vhe mott learned and elaborate commentary upon this prophet was written by two Spanifh Jefuits, Pradus and Villalpandus, in three volumes folio, of which Dr. William Lowth has availed himfelf in his valuable continuation of Bifhop Pa- trick’s commentary on the Old Teitament. The lateit and belt verfion of Ezekiel is that of the late learned bifhop New- come, in 1788, in 4to. with a preface and notes, which Bibli- cal {cholars will perufe with advantage. Prideaux’s Conn. vol. i. ; Loowth’s Comm. Pref.: and Preface to Newcome’s Com. Egexren’s reed, or red, a {eriptare meafure, computed by late writers te amount te 1 Engliih foot 11 inches + of an inch, a EZRA, EZRA. EZRA, or Ezpras, in Biography, a Jewifh prieit, autMor of the book that bears his name, and compiler of the Canon of the O. T., was a defcendant of Seraiah, the high prieft, who was put to death by Nebuchad- nezzar at the capture of Jerufalem, in the year 587 B. C. and flourifhed about the year 458 B.C. He was probably born in the land of captivity, and acquired the refpect and confidence of his countrymen by his diftinguifhed learnirg, acquaintance with the fcriptures, and zeal: for the religion of hie fathers. Inthe beginning of the 7th year of Ar- taxerxes Longimanus, or 458 B.C., Ezra received his eommifiion to return to Jerufalem, with as many of his nation as chofe to accompany him, for the purpofe of re- {toring and {ettling the ftate, and reforming the church of the Jews, and of regulating and governing both accord- ing to their own laws. ‘The extraordinary powers with which Ezra was invefted feem to have been conferred upon him by the influence of Efther, who was at this time in high favour at the Perfian court. At the commencement of his journey he appointed a faft, with a view of recom- mending himfelf and his affociates to the divine protection, and arrnved at Jerusalem on the 1{t day of the 8th month, having {pent 4 whole months in the journey from Ba- bylon thither. Having delivered up to the temple the rich offerings which had been made to it by the king, the nobles, and the Jews who remained in Babylon, and having comniunicated his commifiion to the king’s lieutenants and governors throughout Syria and Paleftine, he made no de- Tay in the execution of it; and difficult and arduous as it was, he perfevered during an interval of 13 years, till Ne- hemiah arrived with a new commiffion from the Perfian court, to co-operate with him. From the advancement of Efther to the high dignity of queen in the court of Perfia, and the proteGiion and patronage’ thus afforded him, Ezra derived an encouragement to go on. with the work of reforming and fettling the Jewifh church and ‘tate in Jeru- falem, which he had undertaken. We fhall here obferve that the date of the commiffion granted to Ezra in the 7th year of Artaxerxes furnifhes the commencement of the 70 weeks of the famous pro- phecy, delivered in the oth chapter of Daniel, concerning the advent of the Meffiah, that thefe 70 weeks are weeks of years, and that the whole number amounts to 490 years, at the end of which the- period marked in the prophecy expired ; after which the Jews were no longer to be the peculiar people of God, nor Jerufalem his holy city, be- caufe then the economy which he had eftablifhed among them was to ceafe, and the worfhip which he had ap- pointed at Jerufalem was to be wholly abolifhed. All this was accomplifhed at the death of Chrift. Accord- ugly, the end ot thefe weeks being fixed at the death of Chrift, we may eafily calculate their commencement. The death of Chrift, as moft learned men agree, took place in the year of the Julian period 4746, and in the Jewifh month Nifan, when the Jewifh paflover was always cele- brated ; and, therefore, 1f we reckon 490 years backward, this will lead us up to the month Nifan, in the year of the Julian period 4256, which were the year and the month in which Ezra had his commiffion from Arta- xerxes, for his return to Jerufalem, in order to reftore the church and ftate of the Jews. According to this inter- pretation of the prophecy, the words * to reitore and re- build Jerufalem’’? cannot be underftood in a literal fenfe. If this be the cafe, they mult be underftood of that re- building of Jerufalem, which was accomplifhed by virtue of the decree of Cyrus, in the firft year of his reign, 536 years B, C.; but from this era to the death of Chritt were 568 years; and, therefore, if the faid 490 years be computed from thence, they will expire many years before the cutting off or the coming of the Meffiah, both of which events ought to fall within the compafs of them according to the words of the prophecy. But to return from this digreffion. One of the firft objeéts of Ezra’s attention, after he had appointed judges and magiftrates, was to induce the Jews to diffolve the marriages, which had been contraéted by many of them in direét contradiétion to the law of Mofes, with wives from the families of their idolatrous neighbours, During the ‘continuance of his government he feduloufly employed himfelf in reftoring the difcipline and rites of the Jewifh church, and the worfhip of the temple, accord- ing to the form in which it had exifted before the captivity. But we mutt not omit to mention a very important meafure which engaged the attention of Ezra, and to which he devoted his fkill and induftry ; and this was the correétion and revifion of the books of the facred writings. What he did in this refpeét towards forming a complete canon of the feriptures, has been already ftated at large under the article Binte. Although Ezra’s commiffion was fuper- feded by that of Nehemiah, in the 2oth year of Arta- xegxes Longimanus, he continued, in concurrence with the new governor, to perfeé the reformation which he had begun. When he had completed his revifion of the fcrip- tures, and had them written out in the Chaldzan charaGer, he made preparation for publicly reading the law of Mofes to the people at Jerufalem. The day appointed for this purpofe was the firlt day of the feaft of trumpets, when the commencement of the new year was joyfully cele- brated. Having afcended a feaffold, which had been erected in the moft convenient part of the city, and being attended by 13 of the principal elders of the people, he began to read the law out of the Hebrew text, and fome of the Levites, previoufly inftru&ted and appointed for this purpofe, rendered it into Chaldee, which was then the vulgar language of the people; and he proceeded thus, day after day, during this feftival, and alfo that of taberna- cles, tilk the whole law was finifhed. Nehemiah and Ezra, at the clofe of this folemn bufinefs, by which the minds of the people had been much impreffed, proclaimed a faft, in order to give them an opportunity, and alfo incitement, for a public and folemn confeffion of their fins, and for enter- ing into engagements of future obedience to the laws which had been explained to them. The fubfequent events of Ezra’s life are not recorded, Jofephus fays that he died at Jerufalem; but other Jews affirm that he returned to Perfia, and died there, in the 120th year of his age. Many fables have been related con- cerning him in the writings of the Talmudifts, and they have been borrowed by the Mahometens; but they are not deferving of recital. Several of them may be found in Herbelot’s “ Bibliotheque Orientale,’? under the articles Ozain, and Ben Seraiah. The book of Ezra was written by him, partly in He- brew, and partly in Chaldee, viz. from the 8th verfe of the 4th chapter to the 27th verfe of the 7th chapter; and contains the hiftory of the Jews from the time of Ar- taxerxes’s, or, as others fay, Cyrus’s, edi& for their return, to the twentieth year of Artaxerxes Longimanus, It fpecifies the number of Jews whe returned, and Cyrus’s proclamation for re-building the temple, the obftruétion it met with, and the finifhing thereof in the reigt' of Danus. It is canonical, and allowed as fuch both by the church and the fynagogue, The books of Ezra, called in the Englifh verfion, © the 4 Firk EZ R A. Firft and Second Books of Efdras,’’ though held by fome, particularly the Greeks, for canonical, are thrown by the Englifh church into the number of apocryphal books, being only extant in Greek. Thefe have been defervedly rejected from the canon as {purious productions, confilting of com- bined extracts from the genwine book of Ezra, rabbinical fables, and the dreams of fome Chriftian vifionary. The Jews aferibe to Evra the book of Nehemiah, but this opinion is contradi&ted by Nehemiah’s own declaration at- the beginning of it, and by his always {peaking of himfeif in the firft perfon, Some have alfo conjectured that Ezra was the author of the book of Ether, which fee; and many have, with greater probability, attributed to him the compilation of the two books of Chronicles; and others have faid that he was the writer of the two books of Kings. Prideaux’s Com, vol. ii. Du Pin. F. Y The fixth letter of the alphabet, and the fourth con- 9 fonant. The letter F may be either confidered abfolutely, and in itfelf, or with regard to the particular languages where it is found. In the firft view, F is generally placed by gram- marians among the femi-vowels, and diltinguifhed in the enumeration of the alphabet by a name beginning with a vowel ; though it has fo far the nature of a mute that it is eafily pronounced before a liquid in the fame fyllable. Joh. Conrad. Amman (in his Differtatio de Loquela) divides the confonants into fingle and double, and the fingle into hiffing and explofive. “Among thofe called hiffing, there are fome pronounced by the application of the upper teeth to the lower lip ; and thefe are the F and ps. ‘The reafon why fome account the F a femi-vowel, and Amman places it among the hiffers, is, that one may pronounce a little found without any other motion of the organs than what is neceffary to the pronunciation of the F. In Englifh its found is invariable, being formed by com- preffion of the lips, or a junction of the upper teeth with the under lip, and a forcible breath. This letter is derived to us from the Romans, by whom it was borrowed from the Molians, whe, having no rough breathing, invented this character, or rather borrowed it from the oriental tongues; among the olians it is called digamma, or double gamma, as refembling two I’s, (gammas,) one over the other. The Latins ufed this great F inftead of wv. Hence the A®olians, and the Latins after them, write Foie; for owos, vinum, and Frowepe for tospay uelperes and «Fwy for cis, evum. (See Letter E.) The afpirate, fays the ingenious writer, cited under that article, inftead of vanifhing on the principle there ftated, was changed into a labial letter, w, v, J, ford. The digamma, however, did not always originate in a guttural, but fometimes in confonants allied to our w or y. The digamma, fays the fame author, did not belong, as Dr. Bentley and others fuppofed, to the Holic dialeé&t only, but to all the dialects of Greece in their more ancient mode of pronunciation ; and he obferves, in oppofition to the opinion of the learned, who fay that the digamma at fy/? prevailed, and was afterwards fucceeded by the afpirate, that the gutturals at firit prevailed, which were foftened into mere alpirates, and that thefe were again changed for a more eafy and agrecable letter, which being fimply a labial, was diveriilied by different people into 9, zw, vw, ?, orf. In contradiction to this very plaulible theory, it may be alleged, that the dizamma is to be found only in Homer, the moft ancient writer of Greece, while the afpirate occurs in all the more recent authors. T'o this ob- jection it is replied, that the ufe of the afpirate obtained in the written language, and was, therefore, leis fufceptible of corruption: on the other hand, that of the digamma prevailed in pronunciation, which was more liable to change, and to deviate from the original terms. Homer, we may naturally fuppofe, adopted the firft in compofiug and writing his poems, and the laft in reciting them to the people. The written form, we may prefume, was at firft ufed but little, but prevailed by degrees, while the peculiarities of pronunciation in their turn began to decline. The language, as written by Homer, at length became fafhionable in the converfation of polifhed people ; and the afpirate being thus triumphant in the daily converfe of learned men, would of courfe in their writings triumph over oral and temporary corruptions. The prefervation of the afpirate in the writ- ten poems of Homer, while the digamma was ufed in recit- ing them, is a proof that Homer did actually ufe a written language, and that his works were preferved by a written language ; otherwife the afpirate would have been loft, and the digamma alone would have prevailed iu all the Greek authors who followed. If an editor of Homer in modern days would infert the digamma, he would corrupt the ori- ginal orthography of Homer, and fubftitate, in the room of the original charaéters, the corruption of pronuacia- tion. Mr. Jones further obferves, that the change of a guttu- ral into an afpirate, or into a long vowel, or into a labial letter, called the digamma, is not peculiar to any one language, but is founded in the ftructure of the organs of {peech ; and inftances of it prevail in all tongues, both ancient and modern. We may further add, that the dis gamma feems in its origin to have been no other than the Greek ©, which being made at three itrokes, degenerated at length into the figure F. For the letter @ being cam. pounded of an omicren with a perpendicular drawn throughs it, if that perpendicular be made firft, and the O at two ilrokes afterwards, wiz, firft the upper, then the under party it may happen, efpecially in writing fait, that the two parts fhall not join; and even initead of two arches of circles, hafte and conveniency may naturally enough make’ two ikraight lines. : : What contirms this tranfmutation of the @ iato F, ig G2 that F that on the medals of Philip, and the kings of Syria, in the words EFMIMANOYE and GIAAAEA@OY, the phi is fre- quently feen in the form jutt mentioned ; z.é@. it has no circle or omicron; but acrofs the middle of the perpendi- cular is a kind of right line, formed only of two dots, the one on the right fide, and the other on the left, reprefent- ing a crofs +. Such appears to be the origin of the letter F, which of confequence is no other than a corruption of the Greek ©; and accordingly, on the medals of the Falifci, the F is ordinarily put in lieu of the Greek © : but it matt be added, that though the Greek and Latin letter were thus the fame thing, yet the found was much fofter among the Latins than among the Greeks, as was long ago obferved by 'Terentianus. wthy The Roiaans for fome time ufed an inverted F 4, in lieu ofa V confonant, which had no peculiar figure in their alphabet : thus, in infcriptions we meet with TERMI. A WIT, Digl, &c. According to Lipfius, in his Com- ment on the Annals of Tacitus, lib: xi. Covarruvias and Daufquius, this inverted digamma jJ was firit introduced by the emperor Claudius. See Tacit. An. lib. xi. cap. 4. and Suet. in Vit. Claud. cap. 41. : It may be added, that the pronunciation of the F is al- moft the fame with that of the V, as will be evident by attending tothe manner of pronouncing the following words : Favour, Vanity, Felicity, Vice, foment, Pogue, &e. The French particularly, in borrowing words from other languages, ehally turn the final v into an f, as chetif of cattivo, neuf of novus, nef of nawis, &c. ; In- the latter Roman writers we find the Latin F and Greek © ph frequently confounded ; as in Falanx for Pha- lanx, Filofophia for Philofophia, &c. which abufe is ftill retained by many French writers, who write Filofophie, Filippe, Epifane, &c. and even fometimes by the Englifh as in fantafy, fltre, &c. F, in the Calendar, is the fixth dominical letter. F, in the Civil Law. Two ff's joined together fignify the Pande&s: fee the reafon of this under Panpecrt. F, in our Ancient Cufloms, was a ftigma or brand. He that fhall malicioufly ftrike any perfon with a weapon in church or church-yard, or draw any weapon there with an intent to ftrike, fhall have one of his ears cut off. and if he have no ears he fhall be marked on the cheek with a hot iron having the letter F, whereby he may be known for a fray-maker, or fighter. F, or Fa, in Mu/fic, denotes the bafs-clef, being placed on the fourth line upwards. Indeed the charaéter or fign by which the f and c clefs are marked, bear no refemblance to thofe letters. Mr. Malcolm thinks it were as well if we ufed the letters them- felves ; but cuftom has carried it otherwife. The ordinary chara&ter of the F or bafs-clef is 3 which Kepler takes a great deal of pains to deduce by corruption from the letter F itfelf. F, in the /talian Mujic, is often ufed inftead of forte. ¥F, implies fortifimo, very ftvong, or loud. F, in Medical Preferiptions, ftands for fiat, let it be done, as F. §. 4. denotes as much as fat fecundum artem. F, among fuch as give us the numeral value of letters, Signifies 40, according to the verfe « Sexta quaterdenos gerit que diftat ab alpha.” And when a dah was added over it ¥, fignified 40,000. F, on the French Goins, is the mark of the town of Angers: ‘in a flat but fertile country. FAD Fa, in Solmifation, is always the fourth found of each. hexachord, as 4, re, ide : F, Fa, Ur, in the icale of Guido, is the note which occupies the fourth line in the bafs, on which the clef is placed: fa implies the fourth in the natural hexachord of C, and the wé the firft note of the molle hexachord. Fa Feinr, in Old Mufic, implied F x; and any note not in the regular hexachords, whether flat or fharp, was faid to be a feigned or fictitious note. Fa Ficrum, Latin, or Fa Finto, Ital. in Old Mujfical Language, implied F %. See Fa Feint. FAABORG, in Geography, a fea-port town of Den- mark. on the fouth coaft of the ifland of Funen, fituated Its harbour is not good $ it principally trades in provifions, N. lat. 55° 6!. E. long. 10° 16. FAAS, a town of Hindooftan, in Dowlatabad; § miles S. of Amednagur. FABA, in Botany, from ¢eye, to eat, the common or broad bean. Jufi. 360. Tourn. t.2i2. Juffieu feparates this as a genus from Vicia chiefly on account of the verti- cal, not lateral, infertion of the feeds, whofe fear or Ai/um is terminal. ‘There are feveral fpecies, and their ftout ereét habit, fo different from that of Vicia, countenances the meafure. Even Gertner however, fo critical in differences in fruit, has not adverted to this, and the general opinion is in favour of J.inneus who combines the two. See Victa. + Fasa Bengalenfis, in the Materia Medica, a roundill: compreffed fubftance, about an inch in diameter, brought from Bengal, and thought to be a vitiated fruit of the myrobalans kind. Itisa very good aftringent, and has been fuccefsfully preferibed in fluxes and hemorrhages. Fasa St. [gnatii. See StryYcHNOS. Fasa Purgatrix, the fruit of a {pecies.of ricinus. See Patma Chrifli and Casror-otl FABACIUM, a word ufed by the ancients to exprefs a. fort of food then in ufe, which was a kind of cake made of bean-meal. FABAGO, in Botany, fee Zycoruyttum. The name alludes to the thicknefs and fhape of the leaves, refembling the feed-lobes of a bean. FABALIS Lapis, in Natural Hiflory, a ftone men tioned by many ancient authors of repute as found in the river Nile, of the fhape of the common bean, and of ablack colour. They fay it had the virtue of curing dzemoniace, and that dogs durft not bark if it was laid before them. Thefe, and many other like virtues, are attributed to this ftone, to the great difgrace of the fober authors who relate them. The ftone feems to have been of thofe extraneous: foflils which Dr. Hill has ftyled ichthyperia, from their having been formerly parts of the bony palates of fthes. which feed on the fhell-ffth kinds; and other authors fili- quaftri, from their refembling the pod of the lupine or bean. FABARIA, in Boteay, a name given by fome authors to. the telephium or orpine, and by which it 1s in fome places. called in the fhops. Fasartx Calende, among the Romans, the calends of June, fo called becaufe the beans being then firft mpe, fome 7 them were offered to. the goddefs Carna, the wife of anus. FABARIS, in Ancient Geography, Farfa, a river of Italy, called by Ovid Farfarus, which had its fource at a {mall diftance to the eait of Carpefia, at a place now called «Capo Farfa,” and purfuing a welterly-courfe, difcharged itfelf into the Tiber. FABA. FAB FABATARIUM, among the ancients, fignifies, ac- cording to fome, a large veffel in which beans were kept ; others will have it to have been a kind of difh or plate into which bean-pulfe was put and offered to the houthold gods. FABER, Henry, in Biography, publifhed an elementary traét on mufic, (ad Muficam Praticam Introductio, mulhus, ) 1571, in which the feale in the harmonic or Guidonian hand is better arranged than in any other book of the kind that we have feen, by placing a clef at the top of the three middle fingers, as beacons or land-marks, and making each finger the reprefentative of a tetrachord. See plate, Hittory of Mufic, vol. ii. p. 95. Faser, Garcory, publiihed at Bafil, in 1552, “*Mufices PraGtice Erotematum,” in two books, o€tavo, containing 230 pages; which, when they were written, could have been but of {mall ufe to aftudent without the colloquial com- mentary of a matter: its only value, indeed, now is, that it contains compofitions of Julquin, Brumel, Okenheim, and other muficians of that time. Fanrr, Jaconus STAPULENS#S, or JAMES LEFEVRE, born at Etaples in the Boulonnois, and who flourifhed about the beginnirg of the 16th century, was an able mathema- tician, and one of the few writers on mufic which France could boaft of at that early period. He was educated at Paris, and with a view to further improvement, he tra- yelled through various parts of the world, that he might have an opportunity of converfing withthe learned. On his return to France, he declared open war againft the Scholaftic philofopky, and attempted to introduce gennine Ariftotelianifm, as well as to difleminate a tafte for mathe- matical learning. Befides feveral theological works, he wrote commentaries upon the dialeétics, phyfics, politics, and economics of Ariftotle. Of thefe commentaries one of his conteraporaries fays, ‘* Faber has rendered the Peripa- tetic doétrine fo clear, that we have no longer any occafi n for Ammonius, Simplicius, or Philoponus.’? Another feys, *-Vaber was the firft amoug the French, as Cicero among the Romans, who united philofophy and eloquence.”? The boldnefs with which he oppofed the corruption of philo- fophy brought upon him a fupicion of herely, and the per- fecution of the doétors of the Sorbonne; bat he found a fecure afylum in the court of Margaret, queen of Navarre, where he is faid to have lived to the age of 100 years ; “and where he died while veering between Proteftant and Catholic. His chief works were theological, but his name is preferved by Proteftants as a mufical writer, and author of an elementary treatife on the art, (Mufica Libris Quatuor Demonttrata, ) under the title of “Jacobi. Fabri Stapulenfis Elementa Muficalia, ad Clorifimum Virum Nicolaum de Haqueville, &c.”? Paris 1496 and1552. Zarlino mentions him by the title of TI Stapulenfe.”? He is faid by Bayle to have died at Nirac (where the king of Navarre held his court in 1537) at near 100. Bayle, who {ays nothing of his mufical work, has been very aignielon his polemics, calls him a bit of a man, “c’etoit un petit bout d’homme,” with a perturbed dpirit, who attacked his friend Erafmus in an unhandfome Manner; in which controverfy he loft. reputation, and proved himfelf to be neither Catholic nor Protettant. His mufical demonftrations, in a {mall 4to. of only 44 leaves, begins by a lift of the Greek founders and ‘writers on the {cience, and the wonted wonders of its effects ; fol- a a by an eloge on his matters, Labinius and Turbi- nus. He gives a lift of all the ancient writers on mufic, Greek and Roman, from Ariftoxenus to Boethius, but appears to have read none of them, except Boethius, whofe treatife he FAS feems merely to have abridged. Salinas fays that he under= ftood other parts of mathematics better than mufic. His tract is folely confined to harmonics, and was admired in his own time, becaufe he had no rivals; but fo frequently has the fubjeét of harmonics been treated fince by mathemati- claps of a fuperior order, that this is only valuable for its age and fcarcity. He takes notice of the Senatus Con- {ultum againft Timotheus, but he has given us no copy of it, nor does he mention any other notation nfed by the Romans, iu the time of Boethius, than that of the Greeks. There are feven or eight muficians and mufical writers re- corded by Walker in his mutfical diétionary of the name of Faber, and Lefevre, but as neither mufic nor precepts of any ufe are come down to us from their labours, we fhall let them go gently down the ftream of oblivion, without endeavouring to check their courfe, or applying to the ha- mane focie.y. Fazer, Joun, was born at Hailbron, on the Necker, about the year 1500 ; the circumftances of his early life have not come down to us, but we find him belonging to the Dominican order, and a doétor in theology at Cologne ; after which he went to refide at Augfburgh, where he ac- quired confiderable reputation as a preacher and writer againft the Proteftant doftrines. His writings are chiefly polemical, among which is “Fructus quibus dignofcuntur Heretici,” a work highly regarded by the Catholics of his own day on account of the facts, or perhaps fables, which it details concerning Luther. He wrote alfo in the Germaa language “ An illuitration of the Prophecy of Joel,” anda collection of prayers compiled from the fcriptures and the works of St. Auguftin. Moreri. Fazer, Joun, furnamed from his own principal work, 6¢Malleus Hereticorum,’? was born at Leutkirchen, a town of Suabia, towards the end of the 15th century: he was zealoufly attached to the caufe in which he had been educated, and was admitted to the degree of doctor in theo- logy. In1518 he was appointed by the bifhop of Con- flance his official, and in the following year his vicar-ge- neral, and in that charaéter he was appointed to examine the tenets of Zuingle and his fellow retormers in Switzer- land. In this bufinefs his zeal outitript all fenfe of mode- ration and propriety, and he exclaimed at one of the debates in which he was engaged “that the world might very well live in peace withont the gofpel.’? This was in reply to thofe who contended that the fcriptures were the only rule of faith and good condv@. The reformers car- ried their point, an edict was iffued favourable to their opi- nions, again{t which Faber had the temerity to enter his pro- teft. He was next appointed confeflor to Ferdinand, who at that time was king of the Romans, and afterwards emperor, who fent him as envoy to the court of Henry VIII. of Eng- land. In the year 1531 he was advanced to the bifhopric of Vienna as a reward for his zeal and exertions in the Catholic caufe. To this inftance of promotion Erafmus alluded when he faid “that Luther, notwithitanding his poverty, found means to enrich, his enemies.’”? He died in the year 1542, leaving behind works which were publifhed at dif- ferent times, but which after his death were colleéted in three volumes folio. .Moreri. Faper, Basi, another learned German born in the year 1520 at Sorau, in Lower Lufatia. he pafled through many degrees of church preferment, end died at Erfurt in 1576. He pubitfhed works fufficient for two volumes folio, but his moft celebrated piece was “ Theiaurus Evuditionis Schola!hex,’? which has gone through many editions, aug mented and improved by the labours of the learned. +e bel FAB bet édition is that of the Hague in 1735, in two vols. Moreri. Faber, Honoratus, was born in the year 1626, ata eriod when the {cholaftic philofophy declined. He was pro- effor of mathematics and philofophy at Lyons, and wrote upon philofophy, logic, and phytics. He implicitly followed neither the Scholaftics nor the Ariltotelians, but borrowed light from modern philofophers, particularly the Cartefians. His innovations, however, brougaot him under a ftrong fuf- picion of herefy, and produced littlezeffeét. Fazer, Pirrre-JEan, a phyfician of the faculty of Montpellier, and the author of numerous works relative to medicine, furgery, and chemittry, publifhed chiefly between the years 1624 and 1626, at Touloufe. Little ‘more is known refpecting him, than that he practifed his profef- fion at Cattelnaudary, in Languedoc, with great reputation ; fo that he was frequently fent for to the cities of that pro- vince, efpecially to Touloufe. The titles of his treatifes will be found enumerated by Eloy. In one of thefe, “ In- fignes Curationes Variorum Morborum, Tolofe, 1627,” he informs us that he fucceeded in guriog a rich and noble young lady of an hyfterical difeafe, mixed with occafional attacks of epilepfy, and that fhe married him in reward of his fervices. Eloy Dié&. Hitt. Several phy‘icians of the name of Faber, of lefs note, are mentioned by Mangetus and Eloy ; one of whom, named Albert, after having praCifed his profeffion at Lubeek about the year 1641, aud fubfequently at Hamburgh, be- came phytician to Charles IL., to whom he dedicated his only work, written in Englifh A Latin tranflation of this work is extant, under the title of ‘* Practica recenfitio de Auro potabili médicinali, ejufque virtute,’? printed at Francfort in 1678. He furvived his royal matter but one year, having died in 1686. : Faser, in Ichthyology, the Englith Doree, a {pecies of Zeus ; which fee—Alfo, a fpecies of Chetedon ; which fee. FABIAN, Rosert, in Biography, an Englifh hiftorian, bora in London in the rsth century, and brought up to active bofinefs. In the purfuits of commerce he was fo dittinguiflted as to be chofen fheriff of the city in 1493. His leifure ours were devoted to literature, and particularly to the ftudy of hiftory. He employed himfelf in compiling a chronicle, which was printed after his death, entitled * A Concordance of Stories.’ It is divided into feven parts, of which fix refer wholly to the hiltory of England previoufly to William the Conqueror; the feventh brings the Englifh and French hiftories down to the reign of Henry VII. He is copious in the affairs of London, m which the work is chiefly valuable, and on that account it is called by Stow “a painful labour, to the great honour of the city and the whole realm.’? ‘To each of his books are prefixed a metrical prologue and other pieces in verfe, which led bifhop Tanner to ftyle him, “ pocta haud infelicis ingenii.”’ His chronicle was priated in the year 1516, four years aiter the author’s death. Biog. Brit. FABIANE, in Geography, a river of Louitiana, which runs into the Miffiffippi. N. lat. 39° 31’. W. long. Ital 3 FABIANS, Fasut, in Antiguity, a part of the Luperci. Thofe priefts confilted of two colleges, the firit of which was called the Fabii, andthe fecond the Quintilii, from their refpeétive chiefs. The Fabii weve for Romulus, and the Quintilii for Remus. FABIANUS, Paryrivs, in Biography, an intelligent naturalift, who hived in the reign of Tiberius, and wrote a treatife “ On Animals.”? Pliny calls him natuiz rerum FASB peritiffimus.” He is alfo mentioned by Seneca and othe, writers. Le Clerc, Hitt. de la Med. » T'antanus, pope, was a native of Rome, to the bifhopric of which he fucceeded in the year 236. He prefided in that high {tation till the year 250, when he fell a martyr to the Decian perfecution. He is charaéterized by St. Cyprian as “an excellent man, the glory of whofe death had anfwered the purity, holinefs, and integrity of his life.” According to Tillemont, and others, a great part of Gaul was indebted to Fabianus for its knowledge of Chriftianity, which was taught by the bifhops that he trained up and fent out in miffions for the propagation of religion. Moreri. FABIO, SrGnor, in the year 1770 was leader of the opera band at Naples; a mufician who knew and performed his bufinefs admirably. As his name or his merit can be little known in England, he would not perhaps have been recorded here but to relate a circumltance which did him honour, in our opinion, at Naples, but which in England would have degraded him to the rank of a ticket-porter. Having been invited to dine with a gentleman who loved mufic, we obferved that he was fo obliging and fo humble as to bring with him his violin. It is very common in the great cities of Italy to fee performers of the firft eminence carry their own inftruments throvgh the {treets. This feems a trivial cireumftance to mention, yet it itrongly marks the difference of manners and characters in two countries not very remote from each other. In Ttaly, the leader of the firft opera in the world carries the inftrument of his fame and fortune about him, with as much pride asa foldier does his fword or mufquet; while, in England, the indignities he would receive from the populace would foon imprefs his mind with fhame for himfelf and fear for his inftrument. FABIUS, Maximus Q. an eminent Roman commander, whofe hiftory and deeds are incorporated with that part of his country’s annals which are devoted to the period in which he flourifhed. He was matter of the horfe to the dictator Papirius, who, jealous of the fuperiority of an inferior offi- cer, fought revenge in the death of Fabius; but having efcaped, he was himfelf made conful five times, and ren- dered his country very fignal fervices. In the year Bz. 304, he ferved the important office of cenfor, and reformed an abufe introduced by Appius Claudius, who, to obtain influence in elections, had diftributed a great number of freedmen, and perfons of the meanett condition, among the country tribes. Thefe Fabius incorporated into four tribes, and thus nearly deftroyed their influence. On this account he received the appellation of *¢ Maximus,” which was made hereditary in his family. The victories which he ob- tained were very numerous, and many of them of the utmotft importance to the welfare of Rome ; for that over the Gauls and Samnites he obtained a triumph. He afterwards gave a fignal proof of the love which he bore his country, by op- pofing the elevation of his fon Fabius Gurges to the con- fulate, becaufe he deemed lim to be inadequate to the office, from habits of intemperance. Gurges was, however, chofen; and, marching againft the Samnites, underwent a fevere defeat. The father immediately went out as lieute- naut to his fon, and by his valour refcued him, aad obtained a fignal victory over the enemy. Farther fuecefles crowned their exertions, for which Gurges, as coniul, was decreed a triumph. The joyful parent followed the triumphal caren horfeback, and was hailed by the citizens as their great champion and deliverer. This was the conclufion of bis military exploits. He was again nominated dictator in the year B.C. 287. : Faxivs, Maxinvs, Q. furnamed the Cun&ator, on ac- count FAB eount of his great prudence in war, was either the grandfon or great grandfon of the former, and attained the honour of the confulfhip for the firit time in the year B.C, 233, when he obtained a triumph for a victory over the Ligurians. In his youth he had difplayed very moderate talents ; the meek- nefs of his difpofiticn, and the gravity of his manners were imputed to want ot character; it was, however, afterwards difcovered that he had been diligently laying up ftores of civil and military knowledge. When he was conful the fecond time he had to contend with the great Hannibal, and to his flill, and well-timed caution, the fafety of the ftate was owing. His plan was to hazard nothing, but to hover round the enemy, watching his motions, cutting off his fupplies, and perpetually haraffing him with {mall de- tachments, while he himfelf, with the main body, remained in pots of fafety. This condu&, though the bet that could be adopted, was very difpleafiag to the Romaus, who recalled him to the city, and refufed to ratify a convention for the mutual exchange and ranfom of prifoners, which he had made with Hannibal. To enable him to make good his engagements, he ordered his own lands to be fold, and thus railed a fufficient fum of money to anfwer the pur- pote. On departing from the army, he gave orders to Minucius, his matter of the horfe, not to rifk a battle ; but, regardlels of the command, he attacked the enemy, gained fome ad- vantages, and was raifed to an equal rank with Fabius. In a fhort time he was attacked by Hannibal, and would have been entirely cut off butfor the prompt affiftance of Fabius. ¢ On this occafion,”’ fays the hiftorian, “ whatever honour Minucius might lofe as a general, he recovered as a man. At the head of his foldiers he returned thanks to Fabius for his deliverance, called him father, and refigned moit willingly his authority into the hands of the dictator.?? Fabius em- braced him as his friend, and continued him in the poft of matter of the horfe. When his dictatorfhip expired, he left his example. and advice to the conful P. Aimilius, who, not being able to reftrain the rafhnefs of his colleague, Varrag fuftained a defeat at the fatal battle of Canne. /Emilius, when at the point of death, requefted a friend to acquaint Fabius that he had never ceafed to follow his countel, and was innocent of the misfortune. This difaiter juitified the caution of Fabius, and gave him a juit and bigh pre-emi- nence in the ftate. In the fubfequent years of warfare he _was thrice made conful; but his moft confiderable aGtion was the recovery of T'arentum, which had been bafely given up to Hannibal. His fuccefs here was fullied by a1 indif- criminate flaughter of the defenders, and by great feverity towards the inhabitants, who were fold for flaves, after they had been {ripped of their wealth. While Fabius was col- lecting with great care all the gold and filver for the public treafury, he was regardlefs of the admirable {fpecimens of the fine arts which abounded in that Grecian colony ; and be- ing afked what fhould be done with them, he replied, « Let us leave to the Tarentines their angry gods.” Fabius lived to an old age, and was much difconcerted at the fuccels which attended the meafures of Scipio againit Hannibal, though he did not live to witnefs the triumphant clofe of the war. His fon who had been conful died before him, for whom he himfelf pronounced a funeral oration. By Ennius, Fabius is defcribed as «© Unus qui nobis cun@tando reftituit rem.?? And by Cicero he is reprefented as not lefs ufeful in the toga than at the head of the army. Univer. Hitt. ABlUS, in Geography, one of the military towathips in -converling together, FAB Onondago, New York 3 in which is a poft-office, and con- taining 844 inhabitants. FABLE, a tale or feigned narration, defigned cither to inftrnét or divert; or, as Monf. de la Motte defines it, an initruétion difguifed under the allegory of an aétion. Fable feems to be the moft ancient way of teaching: the principal difference between the eloquence of the ancients and that of the moderns confifts, according to Pere Boffu, in this, that our manner of {peaking is fimple and proper, and theirs fwll of myfteries and allegories: with them the truth was ufually difguifed under thofe ingenious inventions, called, by way of excellence, ofa, fabulz, fables 5 that is, words, as intimating that there was the jame difference be- tween thefe fabulous difcourfes of the learned and the com. mon language of the people, as between the words of men and the voices of beatts. At firft fables were only employed in {peaking of the Di- vine Nature, as then conceived ; whence the ancient theology was all fable. The Divine attributes were feparated, as it were, into fo many perfons, and all the economy of the Godhead laid down in the feigned relations and aétions thereof ; either becaufe the human mind could not conceive fo much power and aétion in a fingle and indivifible being 3 or, perhaps, becaufe they thought fuch things too great and high for the knowledge of the vulgar; aud as they could not well fpeak of the operations ot this Almighty Caufe without {peaking likewife of its effe@s, natural philofophy, and at length human sature, and morality itfelf, came thus to be veiled under the fame fabulous allegoric expreffion ; and hence was the origin of poetry, and particularly of epic poetry. The critics,