170 



AGE OF THE DOMESTIC ANLMALS. 



At eight years the entire tables are leveled and the pinchers 

 commence to show a concavity, which corresponds to a convexity 

 of the cushion of the upper jaw. (Fig. 166, h.) 



Fig. 167. 

 a, eleven years. 6, fifteen years. 



At nine and ten years this concavity extends to the inter- 

 mediate teeth, the table of the pinchers is almost square, and 

 the dental star of the pinchers and first intermediate teeth has 

 become long and distinct, (Fig. 166, c.) 



During this period, from six to ten years, the rounded arch 

 formed by the incisors gradually loses its convexity until it 



