972 
Journal of Agricultural Research 
Vol. XXIV, No. n 
the exception that lard was used in the place of butter fat. The growth 
curves m Chart i show that about equally poor growths resulted with 
Doth, of these diets, an average gain in weight of only 0.73 gm. per gram 
of protein intake being obtained. Although diet 2 contained no source 
of vitamin A other than the yellow com (unless the lard may have 
contained some), growth was obtained at approximately the same rate 
as when diet i with the butter fat was used. No indication of xeroph¬ 
thalmia was observed. These facts indicate the presence of vitamin A 
Chart i.—C urves showing the poor rate oC growth of young albino rats fed on a diet the proteins of which 
came solely from whole yellow com. 
in yellow com, as has previously been shown by Steenbock and Bout- 
well (13). 
EXPERIMENTS WITH CORN AND TOMATO-SEED PRESS CAKE 
Studies made in this laboratory {8) have shown that tomato-seed 
press cake contains nearly 37 per cent of protein and that the nutrition¬ 
ally essential amino acids are well represented in these proteins, being 
relatively high in arginine, lysine, and cystine. Qualitative tests also 
show the presence of tryptophane. The nutritional adequacy of these 
proteins, as shown by chemical studies, has been confirmed by feeding 
experiments (3). 
On a diet in which the proteins were furnished by 75 parts of whole 
yellow com meal and 25 parts of tomato-seed press cake, growth at the 
normal rate was secured (Chart 2). On such a diet, the tomato-seed 
press cake furnished 7.4 per cent, and the com 5.4 per cent of protein. 
