DISSECTION .OF .THE EYVE£. gI 
mammals. Each student should be provided with two 
eyes, and care should be taken to have the eyes re- 
moved from the pig before it is scalded by the butcher 
for the purpose of removing the hair. 
No student should attempt to dissect the eyeball 
before reading carefully in one of the human anato- 
mies an account of its structure. The eye should be 
dissected in a wide pan with a layer of bees-wax upon 
the bottom, and as much of the dissection as possible 
should be done under water. 
Dissect off the muscles fat, etc., adhering to the eye- 
ball, leaving only the optic nerve. Ln cleaning the eye- 
ball notice the conjunctival membrane on the anterior 
portion of the eyeball, and the ease with which zt can be 
dissected off. Notice also that the optic nerve enters the 
eyeball to the inside and not at the middle point. 
1. The Sclerotic Coat is the tough white connective- 
tissue coat covering over the greater portion of the 
eyeball. Anteriorly it passes suddenly into 
2. The Cornea, the transparent membrane covering 
the front of the eyeball. Through it can be seen the 
zvzs, With its circular opening, the Aufz/. In the dead 
eye the pupil is usually very much enlarged from the 
dilatation of the iris. 
fasten the eyeball to the bottom of the dessecting-pan 
by passing a pin through the optic nerve. With a patr 
of forceps pinch up a piece of the sclerotic and cut 
through zt with the scessors. The sclerotec ts rather 
loosely attached to the underlying chorotd coat, except 
at the entrance of the optic nerve and near the cornea, 
so that zt can be cut through without tnjury to the 
chorotd. Starting from the hole thus made, dissect off 
a wede strip of the sclerotic extending from the optic 
nerve to the cornea. 
