16 
BULLETIN 687, IT. S. DEPARTMENT OF AGRICULTURE. 
the chemical and physical characteristics of charlock oil and state 
that it can be refined sufficiently to be edible but that at present it is 
largely used for industrial purposes. 
In view of its close resemblance to rape and mustard-seed oils, and 
since a survey of the literature revealed no information in regard to 
its digestibility, it seemed desirable to determine the digestibility of 
this oil when eaten under conditions identical with those under 
which the other fats have been studied. A good grade of unre- 
fined commercial charlock-seed oil believed to be representative of 
that ordinarily obtained by the consumer was purchased on the open 
market for use in the tests. 
The following tables contain the results obtained during four test 
periods : 
Data of digestion experiments with eliarloclz oil in a simple mixed diet. 
Weight 
of food. 
Constituents of foods. 
Experiments, subjects, and diet. 
Water. 
Pro- 
tein. 
Fat. 
Carbohy- 
drates. 
Ash. 
Experiment No. 641, subject A. E.: 
Grams. 
2, 235. 
318.0 
686.0 
193.0 
Grams. 
1, 178. 5 
28.6 
596.1 
Grams. 
57.2 
33.7 
5.5 
Grams. 
192.4 
4.8 
1.4 
Grams. 
795.0 
245.8 
79.6 
193.0 
Grams. 
11.9 
Wheat biscuit 
5.1 
Fruit 
3.4 
Total food consumed 
3, 432. 
"85.0 
1, 803. 2 
96.4 
24.6 
71.8 
198.6 
12.5 
186.1 
1,313.4 
38.3 
1, 275. 1 
20.4 
Feces 
9.6 
Amount utilized 
10.8 
Per cent utilized 
74.5 
93.7 
97.1 
52.9 
Experiment No. 642, subject P. K.: 
"Rlanrmflng-e nonta/ining rharlor'b- nil . , 
2,082.0 
342.0 
276.0 
102.0 
1, 097. 8 
30.8 
239.8 
53.3 
36.2 
2.2 
179.3 
5.1 
0.6 
740.6 
264.4 
32.0 
102.0 
11.0 
5.5 
Fruit 
1.4 
Sugar 
Total food consumed 
2,802.0 
65.0 
1,368.4 
91.7 
20.1 
71.6 
185.0 
10.5 
•174.5 
1, 139. 
28.7 
1,110.3 
17.9 
Feces 
5.7 
Amount utilized 
12.2 
Per cent utilized 
78.1 
94.3 
97.5 
68.2 
Experiment No. 643, subject J. C M.: 
Blancmange containing charlock oil 
1,916.0 
309.0 
369.0 
154.0 
1,010.3 
27.8 
320.7 
49.0 
32.8 
3.0 
165.0 
4.6 
0.7 
681.5 
238.9 
42.8 
154.0 
10.2 
Wheat biscuit 
4.9 
Fruit 
1.8 
Sugar 
Total food consumed 
2,748.0 
72.0 
1,358.8 
84.8 
18.5 
66.3 
170.3 
6.3 
164.0 
1, 117. 2 
41.8 
1,075.4 
16.9 
Feces 
5.4 
Amount utilized 
11.5 
Per cent utilized 
78.2 
96.3 
96.3 
68.0 
Experiment No. 644, subject A. A. R.: 
Blancmange containing charlock oil 
1, 809. 
284.0 
871.0 
252.0 
953.9 
25.6 
756.9 
46.3 
30.1 
7.0 
155.7 
4.3 
1.7 
643.5 
219.5 
101.0 
252.0 
9.6 
Wheat biscuit 
4.5 
Fruit 
4.4 
Sugar 
Total food consumed 
3, 216. 
96.0 
1,736.4 
83.4 
29.1 
54.3 
161.7 
9.5 
152.2 
1,216.0 
50.3 
1,165.7 
18.5 
Feces 
7.1 
Amount utilized 
11.4 
Per cent utilized 
65.1 
94.1 
95.9 
61.6 
Average food consumed per subject per day 
1,016.5 
522.2 
29.7 
59.6 
398.8 
6.1 
