sept. a , 1918 Comparative Toxicity of Cottonseed Products 
431 
the young were 55 days old. During the subsequent 31 days these two 
rats made excellent gains; in fact, they grew nearly as well as the rest 
of the litter on the milk diet. It is quite possible that the previous diet 
may explain why they made such a better record. It is well-known that 
rats supplied by dealers are often less vigorous, probably owing to the 
fact that often they have been reared on insufficient diets. 
Table I .—Effect of various diets on the growth of rats 
UNSUPPLEMENTED DIETS 
Experiment and 
diet No. 
Number of 
rats. 
Diet. 
Average 
weight. 
Change. 
Duration of experiment. 
Ini¬ 
tial. 
Final. 
Experiment i : 
Gm. 
Gm. 
P . ct. 
300 . lot I. 
2 
Cottonseed meal, 30 
5 2 
Died in 9, 17, and 47 
0 
per cent. 
days. * . 
302 .. 
3 
Cottonseed flour, 
50 
Died in 9, 16, and 47 
Gy . 
O 
50 per cent. 
days. 
393,lot I. 
3 
Ether- extracted 
65 
99 
+ 5 2 
Discontinued after 
cottonseed ker- 
29 days. 
nels, 50 per cent. 
38s. 
3 
Soybean meal, 50 
70 
8S 
+ 21 
Discontinued after 
per cent; crude 
22 days. 
cottonseed oil, 
14 per cent. 
Experiment 2: 
300. 
Cottonseed kernels 
94 
9 1 
— 3 
Discontinued after 
0 
cooked 2 hours, 
33 days. 
70 per cent. 
390, lot 2. 
4 
Cottonseed meal 
82 
89 
+ 8 
Do. 
from above ker- 
nels, 50 per cent. 
393, lot 2. 
3 
Ether- extracted 
78 
112 
+44 
Do. 
cottonseed ker- 
nels, 50 per cent. 
Experiment 3: 
390, lot 5 (see 
2 
Cottonseed meal as 
101 
143 
+42 
Discontinued after 
P- 430 )- 
in experiment 2, 
31 days. 
50 per cent. 
Do. 
2 
Milk diet (control).. 
89 
136 
+53 
Do. 
SUPPLEMENTED DIETS 0 
Experiment 4: 
424. 
1 
Cottonseed kernels 
[ 
109 
! 
78 
-28 
Died in 5 days. 
425. 
2 
cooked 5 minutes. 
Cottonseed kernels 
86 
7 1 
-18 
Died in 9 days. 
426. 
2 
cooked 10 min¬ 
utes. 
Cottonseed kernels 
68 
68 
~ 0 
Discontinued after 
427-. 
2 
cooked 20 min¬ 
utes. 
Cottonseed kernels 
85 
65 
-23 
37 hays. 
Do. 
cooked 28 min¬ 
utes. 
a Diets 424 to 427, inclusive, contained 70 per cent of cottonseed kernels, 12 per cent of starch, and 18 per 
cent of laid. Diets 428 to 433 contained 50 per cent of meal, 22 per cent of starch, and 28 per cent of lard. 
The cottonseed kernels used m diets 424, 425, 426, and 427 contained, respectively 0.62, 0.24, 0.10, and 0.07 
per cent of unchanged gossypol. 
