510 



CHORD AT A. 



frequent high, open, grassy plains, their limbs being adapted 

 for fleet movements over hard ground. Even in a domestic 

 state the horse shows a peculiar aversion to trusting itself to 

 soft or boggy ground. On the other hand, the ox family 

 {Bovidce) is at home upon any grassy pasture, whether in 

 forest glades or in rocky districts. The food is in each type 

 much the same and the long soft lips assist greatly in 

 obtaining it. We shall see below, however, that the method 

 of feeding or dealing with the food is different, involving 

 certain differences in the structure of the stomach. 



Fig. 350. — Lateral View of Horse's Skull. 



The right mandible has been removed. {Ad nat.) 

 Frontal. Lacrymal. Nasal. 



Symphj^sis. 

 Note complete orbit, large nasals and lacrymals, and predominant facial regions. 



In habits both families are, as a rule, gregarious, congre- 

 gating in herds. This habit conduces to mutual protection, 

 and is made possible by the wide expanses of pasture at 

 present existent on the earth's surface, though it involves 

 more or less extensive periodic migrations from place to 

 place. 



Bearing in mind both the points of similarity and of 

 difference in the habits of the two types, we can pass to 



