374 DISORDERS 



parts and technical terms are Included) can 

 afford but very flender intelligence to the lite- 

 rary enquirer ; as fuch a wonderful variety of 

 minute diftindtions cannot be comprehended 

 by defcription, a jufl and accurate difcrimina- 

 tion of parts being only to be acquired by 

 attentive and repeated di/fedions. 



We fhall, therefore, for the advantage of 

 general comprehenfion, confider the eye in its 

 external appearance only, vv^ith the difeafes 

 and injuries to which it is liable, reverting 

 occafionally to the great delicacy of its ftrudure, 

 and the exquifite fenfibility of the parts that 

 conftitute the whole. This fuperficial defcrip- 

 tion, taken into confideration, becomes diverted 

 of technical jargon, and diftinftly compre- 

 hended by every individual in poffeflion of 

 the bleffnig of fight ; upon which bafis may 

 be formed a very fair idea, blending an occa- 

 fional reference to their own fenlations ; with 

 fuch explanations as will be introduced to make 

 the different degrees of difeafe fufHciently un- 

 derftood. 



Previous to every additional obfervation, it 

 becomes indifpenfably neceffary to introduce 



fome 



8 • 



