'44 The Anatomy of a HORSE. Chap. IV. 



They are of a convex, globular Figure, inclofed within 

 their proper Lids ; which is an Orbil or Socket made for 

 that Purpofe out of the Bone. 

 *The Eve-lids, The Eye- lids, of which I fliall firll take 



. -^ * Notice, ferve as a Safeguard to preferve them 

 from Dull, and other external Injuries. They are com- 

 pofed o^ the Skin, flefhy Pannicle, and Mufcles, which are 

 all wrought into an exquifite Finenefs : The inner Mem- 

 brane, which is very fmooth, that the Eye may move the 

 more eafily under it, is a Produdion of the Pencramum ; 

 the Extremities or Edges are hard and giiftly, partly to 

 help their Adion, and partly ihaf they may meet clofe to- 

 gether. As to the Fat which lies among the Mufcles, it is 

 of the fame ufe as in moil other Parts, to keep the Eye 

 moift, and eafy in its Motion. 



Voe Humours and The Eye itfelf is compofed of three 



Panicles of the Eye, Humoiirs^ and four T?/?z;V/(?.«. 



*Ihe Adnata. '^^^ ^'^ ^^^^^ Tumcks is call'd Adnata ; 



it arifes from the Pencramum^ and is fpread 

 aril over the White of the Eye ; by which Means it keeps 

 \X film in its Orbit or Socket : It is of exquifite Senfe, and 

 is very full of Blood- veilels, which are perceivable at ail 

 times^ but efpecially when the Eye is any ways hurt. 

 ^j Q>^ . • The next, which is the firft of its proper 



Coats, is called the Sclerotica^ from its 

 Hardnefs : It arifes from the Dura Mater^ being opaque on 

 its hind-part, but clear and tranfparent, like Horn, on its 

 fore- part ; from whence it obtains another Name, and 

 IS called the Cornea. 



fbe Choroidcs ^^^ ^^'^'^' ^^^^'^ Choroides^ from its Re- 

 femblance to the Chorion^ which inwraps 

 the Foetus in the Womb. This arifes from the Pia Mater ^ 

 2s it alfo forms the innermofi: Coat of the Optick Nerve. 

 It is black on its Infide, and open on its fore-part the whole 

 Breadth of the Pupilla. The fore- part of this Coat is 

 alfo djftinguifhed from its back- part by the Name of Vvea^ 

 from its relembling the Colour of a Grape. To this 

 belongs the Ligamentmn Ciliare., becaufe it conlilb of fleH- 

 der Filaments, like the Hair of the Eye-lids. The ufe of 

 thefe Filaments is to widen and conltringe the Crylfalline 

 Humour, by contra6ting or opening the Perforation of the 



fj^, p . The innermofi; or fourth Timick is an Ex-? 



. <v Kenna. ^^^.^^^^-^ of the Subllance of the Opticm^xwo^ 



and 



