THIKTEEN YEARS. 



Ill 



Fig. 109. 



Thii-teen Years (Figs. 107, 108, 109). — In front, the jippearance is 

 much the same as it is at twelve years. In profile, the notch of the su- 

 perior corner tooth is larger ; the inferior appears narrow, with its borders 

 parallel. The plate, drawn from a mare's mouth, shows rudimentary tusk 

 teeth. The inferior tables are round and generall}^ leveled. The supe- 

 rior corner teeth are generally leveled. In the superior pinchers the 

 cups are rounded. 



