58 



DIGESTION AND FOOD. 



DENTITION IN THE SHEEP. In the eheep the same remarks 

 apply, and it is by the displacement of temporary, and erup- 

 tion of the permanent teeth, that the age of this animal is 

 also determined. Professor Simonds furnishes us with the 

 annexed table: 



TEETH OF CARNIVORA AND OMNIVOEA. I have said that 

 in carnivora we have all simple teeth, that is to say, covered 

 entirely over the crown by brilliantly white enamel. The 

 row of sharp teeth is well adapted for its object. There are 

 three pairs of incisors, or front cutting teeth, one pair of 

 canines, and a certain number of simple and cutting molars. 

 It is the last pre-molars, or the first true molars, which are 

 employed in chewing flesh ; they are prominent and sharp. 

 Behind these, especially in the dog, the teeth are armed with 

 round tubercules on their surface, destined for a crushing or 



