141 ^^5 ^rt of Farriery 



The true Catara^ is fituate upon the Cryftalltne Humour of 

 ^^i^ °^ <^ ^^ ^y^' ^^^ ^^ nothing more than an Alteration 

 a atara^ . ^^ Opacity of one or more of its Coats or Strata. 

 For the CryfialUne is compofed of different Strata 

 or Lays in like Manner as you fee an Onion ; and 

 when (as I have faid) one or more of thefe Coats 

 become Opake or Dark, fo as to hinder the Rays 

 of Light from pa fling thro' the Body of the Cry- 

 Jlallme in order to ^11 properly upon the Retina^ 

 A Cata- I ^^Y this is what conflitutes the true Cafara^, 

 raft, what, which differs in Colour, being fometimes White, 

 Pearl-Colour, Yellow, Black or Greenifh : And I 

 am of Opinion the two firft only are cureable, 

 yet not by any Application outwardly or Medicine 

 Removed inwardly adminiilered, but by Manual Operation 

 by manual ^yith the Needle, which turns off the La7nina of 

 Oreration ^j^^ Cryflalline that are difeafed, and then the Rays 

 are a£iitted thro' the remaining Parts. But the 

 Mifchief is, that if you couch aHorfe for a C^/^?-/?^, 

 you can't make him, or rather you can't contrive 

 him Speftacles to wear afterwards, to help the De- 

 ficiency or Planenefs of the CryftalUne, fo that his 

 Sight will not be at all perfedi, tho' he may have 

 enough to keep himfelf out of Pits and Ditches. 



It has been, and I believe ftill is a Notion among 

 Dealers in Horfes as well as Gentlemen, that 

 when a Horfe Harts much, or feems flighted at 

 every Thing he meets, his Eyes are bad ; and Mr. 

 Mr. Snape with like Reafon, believes fuch Horfes have 



ijw/'e's congealed Bits like Motes floating in the Aqueous 



Win'on of }j,^j„fj^y . and that thefe, when they become adhe- 

 cenlured. ^^^^ ^^ flicking to one another, form what we now 

 call a Catarad : But thefe Specks, Flies, Infers, 

 or the like, which arc imagined to go to and fro 

 before the Sight of Human Creatures, (and no 

 doubt it is the fame in this Refpeft as to Brutes,) 

 are no other than the difeafed Parts or Particles of 

 the 0.!twprd Coat of the Cryjlallijie HuiKour, in an 

 initient Caiarad ; and the Reafon we do not per- 

 ceive the Motes or Reprcfentation of flies always 



in 



