372 
Journal of Agricultural Research 
Vol. XXXI, No. 4 
A corresponding order of course prevails for the protein, butterfat, 
calcium, and chlorine intake. The amount of sodium in grams 
consumed by each rat each day is as follows: 
A 
B 
C 
D 
E 
F 
G 
H 
4^ months.. 
9 months. 
0.0276 
.0297 
0.036 
.040 
0.033 
.040 
0.037 
.035 
0.042 
0.040 
.055 
0.072 
.075 
0.172 
.194 
Fig. 4.—Composite growth curves for male and female rats fed on ration C 
Fig. 5.—Composite growth curves for male and female rats fed on ration D 
From this it would appear that approximately 40 mgms. of sodium . 
per day is an optimum amount, in such a ration. Twelve or thirteen 
gms. of feed per day in ration A did not furnish that much sodium, 
