COMPARATIVE ANATOMY. lUl 



portions, and only such portions of light are admitted, as may 

 be received without injury to the sense. 



There appears to be also in the figure, and in some 

 properties of the pupil of the eye, an appropriate relation to 

 the wants of different animals. In horses, oxen, goats, and 

 sheep, the pupil of the eye is elliptical — the transverse axis 

 being horizontal ; by which structure, although the eye be 

 placed on the side of the head, the anterior elongation of the 

 pupil catches the forward rays, or those which come from 

 objects immediately in front of the animal's face. 



