INFLUENCE OF THE PLANE OF NUTRITION UPON MILK 67 



gaira-Luto as modified by Rosenthal and Trowbridge. 7 Table 

 V gives the results. 



* The average of Cow 407 for the year was 3.36 and of Cow 305, 4.03 per cent. 



The negative results obtained on the blood fat seem to in- 

 dicate that in the case of the cow, starvation does not result 

 as is the case with small animals in an increase in the fat in 

 the blood. It would seem therefore that the increase in the 

 fat in the milk could hardly be looked upon as the result of 

 a direct transfer from the body. 



It is believed the explanation may be sought along other 

 lines and the following is suggested. When the body is forced 

 to draw on its reserves for needed energy, the fat is liberated 

 by an increased lipase activity. The hormone or chemical 

 messenger that stimulates this lipase activity must be carried 

 by the blood, and it is reasonable to believe that it will affect 

 the lipase activity in all parts of the body through w r hich 



7 H. Rosenthal and F. F. Trowbridgre, The Estimation of Fat in Blood 

 in J. Biol. Chem., 20, pp. 711-717, 1915. 



