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Show fl-‘N. -_'_________.____ ,_,--- WT 'E86 Book 111. \ , I ng part of the Eye, the Membranes aini cont the of fed ‘out difc ing Hav flot S I‘lul eou Aqu The m. d the in incrmt- will now fpealt of the Humots containe y, and ,1,"me 5 retic nl‘pa , ltl‘a nefs thin in er th Wat mble £1232";th of the Eye + tele t to determine its minute 33,116 Particles er Book Ill. 0f the Eye; 337 " {-x whereupon it having no prop ER. hin the more folid ( ever difpofe d to motion) is quieted and . confine , d Wit haveit: But with the leave of this famous Author, I humbly Conce'i ‘wll, terms of the neighbouring parts of the Irzr, and Cornea above, and below by apparent, and no real Whitenels, which it borroweth from,the bright bey an the Anthea, and Cryltalline Humor. of Light, fporting themfelves in the inward Recelres of this tranf Erent Ems dy, not huecl with colour, with which if it were tinged it wohld b 0‘ Criflalline Humor to be only tranlparent, devoid of colour havin oh‘l t 9: According to Riolan, the Aqueous Humor floateth about the Vitreous, ar diffi. being allo ltated in the lower region of the Eye; but it is fomevrh dred uncapable to tranfmit various colours of vifible obieéh ( throuelic‘n" cult to undetf'rand, how the watry Humor lhould be tranlinitted through own Subltance and vitreous Humor to the Retina ) which though in tgh "S to the Bale of the more folid parts of the Armed and Cryflalline Humor, Humor more a found es fometim is Eye, ‘led adifafl‘et in the Eye; wherein thin and fluide then the Vitreous, but more Denle and. Vifcidc then the {elves very different, would be repref‘ented under that one determinate 8mlour, with which the Criflalline Humor is predifpolhd and it ma be :0- and this Humor may be lomewhat attenuated by the warm ambient Air. in: Configu- The Aqueous Humor is excentrick to the .011) of the Eye, and hath no iiifhiiiif. Figure of it fell, but receiveth its configuration from the impreliions of the 3y"; 0"" more folid adjacent parts, the concave Surface of the Comm and M~zzca,rnaltc vcd by reafon,that every medium of Sight ought to bejdenuded ofhll c [P 0or elfe Imws Ext/lent prohibet aliermm. 0 out, And truly I cannot but wonder why this part of the Eye fhould have the Thecanax. appellattve of a Humor ( as it is commonly received by the Antient and Mo ""C ""m‘" i" dcrn Anatomilts) when it is not fluide, as being of a more folid Bod the- azidgmpmy Liquors, fomewhat refembling {oft Wax in confil'tence; But I will fithlo n the anterior part ofthe Aqueous Humor con\‘ex,and fontewhar orbicular,and with the common denomination, rather then give a dilitutbance Q40 ‘ the Convex Surface of the Cryl'talline doth render the inferior part of the obrinuit. , i wn "mm "f!" This Humor hath halfe of its Orbe enwrapped with a thin Membrane 7'" M‘m' Aqueous Humor Concave. This Watry Humor of the Eye is called by Art/icen, An Excrcment of the Cryltalline Humor; \Vhereupon, when it is evacuated in wounds of the Membranes, relating to the Eye, and the wounded part being healed and clofcd up, the Aqueous Humor is rel'tored again. Calm givetlt in his Firf't Book De Symptom. CaMfi/tfind the Second Chapter, an inlhnce ofa Child, wounded with aBodkin in the Pupil ofhisEye, through which all the drops of the Aqueous Humor trickled down the Eye, like fo many Tears; and the wound being cured, the Aqueous Humor Was rcliored, and the Child recovered his Sight. Ohthe like dil‘afl‘eétion Hilda- _.__-....., lolide, is nothing akin to it, and therefore cannot propagate this thin fluide «aL‘. Hm giveth examples in his Firft Century, and Twenty Firit Obfervarion. I conceive the repair ofthe watry Humor, when evacuated in wounds of the Eye, doth not proceed from the Cryfialliue Humor, which being mOTB Aqueous Humor From theLympha ofthe Blood, diftilling out of the m' Low ..._...«.i.-: ence and hardnels, but in tranfparence and colour, as Léained Vryizlifk' "Ii 33%;? Coa Aqueous 5 exfiilling from the Vitreous Humor through its broken Tunicle, I The Humor of the Eye, called b fome Cri allin ‘ ' 1 Glarialir, from the likenels it efpoufeth' with Criffil or "length? 333:5 i": dihiii?‘ Excrement (As A'I/iLCfl would have it) through the Armed: Again, if this Aqueous Humor be an Excrement of the Cryftalliue Humor, it mull: havfi fome proper Duets to dilcliarge it, when redundant, which can no waybe difcovered in the Eye‘7 I conceive it more probable to derive the repair offhC minarions ofthe Capillary Arteries inferred into the Mex/e4, and when this [aqueous Humor {hall grow exuberant, it may be returned by the Capillarl' C1115. mafia," The ufe of the Aqueous Humor of the Eye may be to fupport the ("W litprmuruf the and "ma, and the Cryfialline Humor, which being copious and well qualified in young perfons, rendreth the Cornea and Mfr/e4 f0 plump, that its SUP face leemeth too finooth and (hitting, as it were polilhed by Art ', but in0 Men the Aqueous Humor being fomewhat cxhaufied, and ill difpofed, ‘hc ‘. Cornea groweth flaccide and wrinkled. This Humor in its natural Confiitution, is thin and tranfparent to give 3 reception to the vifory' Rays, which are too much refracted in this Humor, v, When it is over Denfe, whereupon the Sight is rendred dimmo, by‘reafOn . Objects are ptefented from thence to the Retina, as through a Cloud~ called Aranea, or Criflallina, which is extended from the upper Reaion t , Emmi" the middle, where it is united to the Retina. a 0 The Figure of the Cril'talline Humor varieth in feveral Perfons and A es and the orbicular protuberance is not always uniform, and is different in gin; lame perfon, occafioned by accidents and age, whole defects are fupplied by Art in the invention of‘Speétacles, which are diverfly contrived with more or lefs prominency, according to greater or leis weaknefi; of the Sight‘ and fometimesxthey are made Concave, (which is rate) when the CriltaI: line Humor 15 too protuberant, but molt perfons of ill Sight are gratified wrth Spectacles of a convcxe Figure, by reafon the Crif'talline Humor bein naturally cndued with a Prominent parabolical Figure, is often deformed ig old Age, with a broad deprefl'ed fiiape, becaufe the fubfiance of the Huo mor being fomewhar abfumed, groweth wrinkled and flaccide, and more tending toward a Plane, then in young perfons, who have a fmooth protuberant, Criflaliine Humor, well adapted to Sight. The Seat of this Humor is placed near the center of the Eye, confining ms 3 p above upon the Aqueous, and below upon the Vitreous Humor, which re- ‘h‘cgfls‘ cerveth a great part of the lower convex Region of the Crifialline Humor 1m: Hum" inrtsconcave Surface; fo that the Criflalline Humor being not exquifitely leated in the middle of the Eye, is excentrick roit, if it be firié'tly taken in reference to its whole Globe, and the Humor is more concentrielt in its anterior Surface to the Cornea, to which it is excentrick, as to its lower Region. . As to the tranfparency of this Humor, it is a matter of as much difficulty 1h: Tranrpaas pleal‘antnefs, to know the caufe and manner of it, which dependeth up- Echhhiiiii" on the Compage and Contexture of its variOus parts; and Bodies are more ""1"" gr leis tranfparent, as they confifl of more or let's rare Particles: And opace edits are made up of many Denfe parts, to elofely conjoyned, that they admit few or no thin airy, or atthereal Particles, into their ambientR ion, and more inward Receifes; whereupon Bodies become more or leis datri, as ‘ The Hum" rh r' ‘Mecr‘ifim‘: Humor. S IO they |