NUTRITION AND GROWTH 



145 



as a result a decline set in, which could not be checked 

 by doubling the percentage of casein in the diet. That 

 lack of protein can not account for the decline is well 

 shown in period 4, during which the original amount 



220 



200 



180 



160 



100 



'/.. 



Milk food 





 -terminal** 



20 



40 



60 80 KX) 



Days 



FIGURE 4. GROWTH CURVE WITH 

 MILK DIET. 



of casein was replaced and "protein-free milk" was 

 also added. An immediate response in appetite was 

 evidenced and speedy recuperation and growth were in 

 order. This experiment demonstrates that a rat unable 

 to maintain itself on an isolated protein may be caused 



