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irom the eyes of liares and rabbits; thefe alio, I found to confift of 

 fcalcs or coats, inclofed one in another, and each fcale or coat com- 

 pofed of filaments ; but, whereas tlie filaments com.pofing the cry- 

 lialline humour m tlie eyes of the feveral animals I ha^•e firlt enu- 

 merated, do arife from three centers, and thence are difperfed three 

 different ways round the circumference, the filaments in thefe two 

 laii mentioiied animals, take only a twofold courfe or direftion. This 

 is fliewn uijig. 4, ABCD, which reprefents the hemifphere, or one 

 half of the cryftalline humour, in the eye of an hare or a rab- 

 bit. E, is the center near the pupil or fight of the eye ; thefe fila- 

 ments, compofmg the coats or fcales, palling through, or near the 

 central point E, take their courfe, fome tov/ards F, and others to- 

 wards G, fo that F and G, on the contrary fide, conftitute another 

 central point. 



I alfo made a drawing, which is copied ^tfig. 5, o'i tiie fame ob- 

 je6l, as it appeared when viewed fidcways, in order more clearly to 

 fliew the nature of thefe lali mentioned filaments, ^^■hich, with a kind 

 of fibrous fubftance, compofe each fcale or coat. I will fuppofethen, 

 that the filaments, which in Jig. 4, are reprefented between E F, are 

 the fame which in Jig. 5, are pi6lurcd at the letters lO ; fo that, the 

 filaments proceeding from the point I, that is, in the former figure 

 at E, here end their courfe at N and L, where they are the Ihortefi, 

 and thofe at O, take their courfe through or bcfide the jxDint or cen- 

 ter N, where they are the longeft, and then terminate, or rather, 

 with a kind of flexure or bending, return as here reprefented. In a 

 word, thofe filaments, which, on this fide, appear neareft the center, 

 would, on the fartlier fide be feen remotefl from it. 



In thefe experiments, I always endeavoured, to difcover the forma- 

 tion of that part of the Eye which anatomifts call the vitreous or 

 glafiy humour, and, which in great part, fiirrounds the cryfiallino 

 humour, becaufc I was well afllired, that this vitreous humour, was 



