20 



AGE OF THE DOMESTIC ANIMALS. 

 1 



B 



Fig. 10. 

 Series of transvorso sections of tlie ri^lit-liaiid inferior permanent incisors of 

 a five-year-old horse. A. forms tiatt('n('<l from in front to behind; B, oval forms; 

 r, rounde<l forms; I), niantj;ular forms; I-', bianj^ular forms. 



