FIG. 15.— VERTICAL SECTION OF HUMAN EYE OF 

 SIMPLEX TYPE 



Bulging out to the left is the tough transparent cornea. At the points where this 

 joins the main wall of the eye there are two projections, each bordered on their 

 sides remote from the cornea by a dark line ; this is the iris seen in section. 

 The space between the free ends of the projections corresponds to the pupil of 

 the eye. The large oval body behind the iris is the lens. The branching pro- 

 jections just above and below the lens and the long ones farther to the right 

 do not concern us. 



