370 
Journal of Agricultural Research 
Vol. XXXI, No. 4 
After the completion of the work just discussed, three of the rations, 
A, D, and H, were repeated with a different lot of wheat, and results 
supporting those just given were obtained. 
The amount of feed in grams per gram of gain for the first 
months, and for the first 9 months is as follows: 
A 
B 
C 
D 
E 
F 
G 
H 
±y 2 months.. 
40.7 
38.1 
12.2 
21.7 
11.7 
21.1 
9.9 
20.5 
8.7 
7.2 
14.1 
10.0 
16.9 
16.1 
22.6 
months_ 
Fig. 1.—Composite growth curves for rats fed on the eight different rations 
It will be noted that the addition of a small amount of sodium to 
this ration greatly increased the economy in the use of the feed. 
Increase of the amount of sodium fed seemed to effect a greater 
economy, up to a certain point. But, beyond this point, additional 
sodium seemed to reduce the economy. Itation F containing 0.785 
per cent sodium seemed to produce the most economical gains in 
weight. However, this amount did not seem to promote the most 
successful reproduction. 
It is also interesting to note the amount in grams of sodium required 
per gram of gain: 
A 
B 
C 
i 
D 
E 
F 
G 
H 
4 y 2 months. 
0.0928 
0.0317 
0.0336 
0.0350 
0.0457 
0.0565 
0.129 
0.4154 
9 months.. 
.0869 
.0564 
.0606 
.0726 
.1107 
i i 
.218 
! 
.5831 
