THE FEEDING OF MILCH CATTLE 349 



given milk of normal composition. As has been 

 shown by numerous investigations, the percentage 

 amount of water remains very constant in milk in 

 spite of great differences in the quantity given in 

 the food. Only under special circumstances, details 

 of which are not understood, is a very watery milk 

 secreted, but it is probably due to the weakening 

 of the organ by continued use of foods containing 

 a large percentage of water (p. 101). 



