16 



Determinations of the per cent of caseine in the milk of the 

 cows in groups i, 2, 4, and of Maramee of group 3, were 

 made by Mr. E. P. Stone at the close of each period, a 

 composite sample from the milk of the last five days in each 

 period being used for the purpose. The results appear in the 

 last columns of tables i, 2, 3, and 4. 



No variations that can be attributed to the character of food 

 are found. A comparison of the different cows shows that 

 the differences in the richness of their milk is rather more 

 marked with reference to fat than to caseine. The following 

 table shows the percentages of fat and caseine in the milk of 

 the different cows during period i, and it also shows the rela- 

 tive proportions of fat and caseine. 



It will be seen that low percentages of fat are accompanied 

 with low percentages of caseine. Poor in fat means, then, 

 poor in caseine, although in the poorest milk the amount of 

 caseine more nearly equals the amount of fat than in the rich- 

 est milk. 



