292 



COMPARATIVE PHYSIOLOGY. 



New-born. 



3 mont)is. 



6 month p. 



1 year. 



3 years. 



2J years. 



3 years. 



4 years. 



5 years. 



6 years. 7 years. 



Flo. 344 (1).— Changes in incisor teeth of horse with age (Wilclcens). 



