ne Ait 0/ t' A R R I E R Y 



the Tunica Aranea, or Membrane that adheres to, 

 or is continued from, the Vitreous l^unic and higa- 

 ?nentum Ciliare : And then, as to his turning the 

 whole Body of the Cryftalline out of its Place, i 

 ihall fhew the Abfurdity of the Notion, after I have 

 defcribed the Parts of the Eye, • and come to treat 

 upon Vifion. But to return. 



The Subilance of the Cryftalline Humour is com- 

 monly taken for a congeal'd or frozen Sort of Body, 

 as the Vitreous has likewife been : But this Opinion, 

 no doubt, has proceeded from a very flight Exami- 

 nation, or rather no Examination at all ; fmce few 

 are fo ignorant as not to have feen a Fiih's Eye 

 boiled, or even any other Creature's, the Cryftalline 

 of which becomes "White, and turns off in many diffe- 

 rent Lamincs or Coats, like unto the Coats of an 

 Onion. And becaufe the Q^— 's Oculift would 

 have us believe, that he £rft difcovered the Capfula 

 of the Cryftalline, I beg the Reader's Leave to 

 tranfcribe the Words of Dr. Kennedy, in his Book 

 publifned in the Year 1713, which I believe will 

 be found to be fome Years before T- — r was a Prac- 

 tifer : The Words are thefe, tnz:.. fpeaking of the • 

 Cryftalline Humour, he fays, " That it lies in a- 

 *' perfe(5l Sort oi Sacculus, that is, its Tunica Ara- 

 *' may being continued from the Vicreous Tunic 

 " and Ligarnentum Ciliare , comes clofely round it, 

 ** fo that it lies very fixed and faft ; but if you cut 

 '*■ its Tuyiic or Coat on the Top or Side, it imme- 

 ** diately fprings out, fo that it feems not to be 

 *' any ways adherent to its Membranes." 



Thus far Dr. Kennedy, whcfe Sacculus for the 

 Cryftalline, I think every whit as pertinent, as 

 T — ^'s Capfula: Although I muft own. Dr. Ken- 

 nedy is miftaken in one particalar, 'viz> where he 

 fays, that if you cut the Tunica Ara^iea, (or which 

 is all one, T — r'j Capfula, ) the Cryftalline will 

 immediately fpring out ; I fay, that Mr. Kennedy 

 is moft certainly wrong in this, becaufe we never 

 couch a Catara^, but we cut this Capfula or thin 



Membrane, 



