DENTITION AND DIET. 



129 



occasionally), the front nippers in the upper and lower jaw makd 

 tlieir appearance, and, during the period, which occurs between 

 the third and fifth week, the middle incisors appear. Between the 

 seventh and ninth month the lateral or corner teeth are cut. The 



Fi§. 7. 



Fig. 



-1 \ EN YEARS OLD. 



EIGHT TEAKS OLD. 



colt is now in possession of a full set of temporary incisors. These 

 temporary, or " milk " teeth, differ from the permanent ones by 

 being much smaller and (previous to shedding) whiter, having on 

 their anterior or front surfaces grooves or furrows; also a well- 

 defined body, neck, and slender fang. They also present oval 

 surfaces anteriority, or in front ; and within the mouth they are 

 concave. Their surfaces are generally uniform and smooth, and 

 resemble the eye of an English horse-bean. 



Fig. 9. 



HORIZONTAL VIEW Or OLD BLACK HAWK'S INCISORS AND TCSHEB. 



The Permanent Teeth. — Constitutional idiosyncrasies are 

 often operative in hastening or retarding dentition, and the char- 

 acter of the food, whether it be natural or artificial; and the 

 9 



