NATURAL THEOLOGY. 251 



it in every degree ; whereby at all times such 

 portions, and only such portions of light are ad- 

 mitted, 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 appro- 

 priate relation to the wants of different animals. 

 In horses, oxen, goats, 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. 



