June i6,1923 
Nutritive Value of Protein Mixtures 
975 
furnished by the peanut flour (Chart 4.) By keeping the proportion of 
the concentrate to corn the same, but lowering the protein level of the 
diet to 7,2 per cent, a better rate of growth was obtained than when corn 
Chart 5. —Growth curves showing the supplementary value of peanut proteins when fed with com proteins, 
at a low protein intake level. 
alone furnished the protein in a diet otherwise adequate at the same level 
(Charts). 
The average gain in weight per gram of protein in this mixture during 
an eleven-week period was 1.23 gm. compared with 0.73 gm. on corn 
alone. Rat 1043, in the above lot, was not included in the average. 
Chart 6. —These curves show the excellent growths obtained on a diet 5.4 per cent of the proteins of which 
was furnished by com, and 9.2 per cent by soy-bean meal. 
EXPJ^RIMENTS WITH SOY B^AN AND CORN 
It has been shown { 12 , 2 ) that soy-bean proteins are adequate for the 
normal growth of albino rats. Our experiments were made with a diet 
in which 25 parts of soy-bean flour replaced an equal quantity of com 
meal. This diet contained 14.6 per cent of protein. Better growth than 
at the normal rate was obtained (Chart 6) when to such a mixture was 
added a suitable inorganic salt mixture, lard and butter fat. In this 
diet, 9.2 per cent of the protein was furnished by soy beans and 5.4 per 
