LESSON XXVI. 

 THE EYE. 



A. DISSECTION. 



1. Take a fresh eye of an ox or sheep, and note 



a. The transparent cornea. 



b. Surrounding and continuous with this, the 

 dirty-white sclerotic which forms the outer 

 coat of the rest of the eye. The posterior 

 two-thirds will probably be covered with fat. 



c. The conjunctiva, a continuation of the 

 mucous membrane of the eyelids. In taking 

 the eye out of the orbit this membrane is 

 cut through where it passes from the eyelids 

 to the sclerotic. Dissect it forwards in any 

 one place ; it will be traceable to the junction 

 of the sclerotic and the cornea. Its epithe- 

 lium is continuous with that of the cornea 

 (cp. B. 2). 



2. Clear away the fat surrounding the four straight 

 muscles, it will be seen that their tendons form 

 a layer under the conjunctiva of the sclerotic. 



