140 



120 



100 



80 



60 



CHARTS AND THEIR EXPLANATIONS. 



Chart XLVI. 



IO3 



20 40 60 80 100 120 140 160 180 



Days 



Chart'XLVII. 



Charts XLVI (rat 177, female) and 

 XLVI I (rat 191, male) show mainte- 

 nance on a diet in which casein formed 

 the sole protein during 83 days followed 

 by growth when protein-free milk was 

 substituted for a part of the non-protein 

 constituents of the diet. The diet was 

 as shown herewith. 



Constituents. 



Casein 



Protein-free milk . 



Starch 



Sugar 



Agar 



Salt mixture I . . . . 

 Lard 



Per. 1. 



p. ct. 



18.0 



0.0 



325 



170 tO 20.0 

 50 



2.5 



22.0 25.0 



Per. 2. 



p. ct. 



18.0 



28.2 



23.8 



0.0 



SO 



0.0 



25.0 



