438 
Journal of Agricultural Research 
Vol. XXIV, No. s 
ExpeRiMBNT IX, Lot LXVII.—(Charted in fig. 9.) This experiment 
showed that when the velvet-bean seed serves as the only source of the 
A vitamine fed at a 60 per cent level very good growth is secured. 
O a /Z /€ 20 24 O ^ 8 /2 /6 20 24 O 4 S /2 /6 20 24 O 4 3 /Z /6 20 24 
n/sars H'££/cs wts/cs /y££/rs 
Fig. 9.—Velvet bean, 60 per cent; casein, 5 per cent; salts (No. 32), 4 per cent; dextrin, 31 per cent Dextrin 
carried alcoholic extract of 10 grams ether-extracted embryo. At point a 4 per cent dextrin was replaced 
by 4 per cent additional casein. 
Experiment X, Lot LXXX.—(Charted in fig. io.) It is quite apparent 
from this experiment that considerable inferior growth is obtained when 
7 per cent of hulls is added to a ration containing 6o per cent of the 
hulled seed, 7 per cent being the concentration of hulls in the whole seed. 
/r££?rs n's/r/rs tvEEKS 
Fig. lo.—Velvet bean, 53 per cent; hulls, 7 per cent; casein, s per cent; salts (No. 32), 4 per cent; dextrin, 
32 per cent. Dextrin carried alcoholic extract of 10 grams ether-extract^ wheat embryo. At point 
a 4 per cent dextrin was replaced by 4 per cent additional casein. 
[ 1 ^ Experiment XI, Lot CXXIX.—(Charted in fig. 11.) This experiment 
shows that autoclaving the hulls at 15 pounds pressure for two hours 
does not remove any apparent toxic substance, and gives additional 
evidence that the hulls interfere with the utilization of vitamine A. 
trSffCS tve£f(s IV££KS W££J<S 
Fig. II. —Velvet bean, 53 per cent; hulls, 7 per cent; casein, 9 per cent; salts (No. 32), 4 per cent; dextrin, 27 
per cent. The hulls in this ration were autoclaved for two hours at 15 pounds pressure. Dextrin carried 
alcoholic ^tract of 10 grams ether-extracted wheat embryo. 
DISCUSSION 
The data for milk presented in this paper are in harmony with the 
results obtained by Mattill and Conklin (2), which show that milk alone, 
while it allows a certain amount of growth to take place, is inadequate 
for reproduction in the albino rat. The attempts made by the authors to 
furnish liquid milk and dextrin with a liberal supply of distilled water 
resulted in complete failure in most cases, and in only a few cases was some 
growth obtained. It is quite evident then that milk is lacking in one or 
more dietary essentials indispensable for satisfactory growth and for 
reproduction. 
From a consideration of the various experiments on nutritive valu : of 
milk (reported in the literature) and in so far as Osborne and Mendel (3) 
have shown that the amino-acid requirements for growth and for main¬ 
tenance are different, it seems to the authors that the difficulty may 
possibly be found with the milk proteins. 
