Table IV gives a summary of the results of the compari- 

 son of diet 107 with diet 108 containing 5 per cent, more but- 

 ter fat, diet 109 containing 5 per cent, more casein and diet 110 

 with an excess of 1 per cent, salt mixture over that in diet 107. 



TABLE IV. 



* 84 gms. is the average weight of 9 rats at 12 weeks of age. 



The results of the experiments tabulated in Table IV are 

 the same as those in the previous series (Table II). " It ap- 

 pears from the data that the basal rations 94 and 107 furnish 

 optimum amounts of the essential food factors, protein, fat, 

 mineral salts and vitamin A. 



DETERMINATION OF THE MOST ADVANTAGEOUS 



DOSE FOR MEASURING HEAT DESTRUCTION 



OF VITAMIN B IN SKIMMED MILK POWDER. 



Feeding the Milk Separately from the Rest of the Diet. It 



was next necessary to determine the amount of milk to feed in 

 order to detect* most readily any change in the water soluble 

 B content upon heating the milk. Increasing amounts of milk 

 were superimposed on the basal diet and a study made of the 

 growth curves in relation to size of the dose. The milk was 



12 



