398 



Manned of Veterinary Physiology. 



can be no doubt that many horses grow much more than 

 two-thirds of an inch between three and five years old. It 

 is probable that many grow up to their sixth or seventh year. 



During the time the young animal is receiving its 

 mother's milk, the urine is acid ; it is practically carni- 

 vorous ; once a vegetable diet is taken the urine becomes 

 alkaline, and, it is probable, decreases in quantity. 



The activity of certain glands, such as the thymus, be- 

 comes considerably reduced as the animal grows,, until they 

 disappear at the adult period. 



One characteristic of the young animal is the necessity 

 for sleep ; it is probably during slumber that the tissues 

 make the immense strides noticeable during the first few 

 weeks of life. 



The period of dentition commences immediately at birth, 

 if it has not already commenced in utero ; the following 

 table from Gamgee* shows the changes taking place in the 

 teeth from birth to adult life : 



Kreutzer's Table of Dentition. 



* 'Our Domestic Animals. 1 



