THE UROGENITAL SYSTEM 161 



of fetal tissues into the body of a virgin. This caused the mam- 

 mary glands to become active and secretion of milk was actually 

 produced. The experiment shows that in the fetus there is 

 some substance, or property, which has a direct action upon the 

 mammary tissue. 



Milk is the food best suited to the needs of the newborn. It 

 is readily digested and assimilated by both the intestines and 

 the body cells of the young animal. The principal reasons why 

 it is better than other foods for the young are that it contains 

 a uniform mixture of the inorganic salts and the essential organic 

 nutrients, especially adapted to the growing organism and little 

 change takes place in it from day to day. 

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