46 



FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



Rat 70. This rat was fed during Period 1 with a mixture con- 

 taining casein 9, pea legumin 9, sugar 15, starch 29.5, lard 30, agar 5, 

 and salt mixture No. 1, containing 2.5 per cent. This contained 

 2.75 per cent of nitrogen. During Period 2, the diet contained 18 per 

 cent of legumin as the only protein, the proportion of the other con- 

 stituents being unchanged. The nitrogen content was 2.97 per cent. 



160 



140 



120 



60 



40 



20 



0.05 - 



CO 



E 



U 



o 

 -0.10 



20 



4-0 



60 



80 100 



Days 



120 



14-0 



160 



Chart XVIII. Rat 70, fed 160 days on Casein and Pea-Legutnin as the only proteins. 

 See p. 47. Numbers on Body-weight line indicate time at which each period began. 



