1()(} 



AGE OF THE DOMESTIC ANIMALS. 



The crowns of the permanent pinchers, in this mouth, have 

 not become quite free from the gums ; the left-hand tooth is 

 somewhat in advance of the other, and its enamel just show» 

 traces of use. 



Fig. 163. 

 Two years, nine months. «, external fa(;e. b, internal face. 



Two Years, Six Months. — Between two and one-quarter 

 years to two years and nine months the first permanent interme- 

 diate teeth have accomplished their eruption. (Fig. 163.) 



In this mouth the crowns of the first intermediate teeth 

 are free from the gums, and the root of the second inter- 

 mediate (temporary) is pressed on and its position slightly 

 displaced. 



