DIGESTIBILITY OF SOME SEED OILS. 15 
Summary of digestion experiments with rapeseecl oil in a simple mixed diet. 
Experi- 
ment 
No. 
Subject. 
Protein. 
Fat. 
Carbohy- 
drates. 
Ash. 
629 
A. F 
Percent. 
86.2 
80.3 
81.3 
73.7 
Percent. 
96.6 
96.0 
96.4 
93.7 
Percent. 
96.4 
94.4 
94.8 
93.5 
Percent. 
97.1 
630 
P. K 
96.9 
631 
J. C. M 
95.7 
632 
C. J. W 
95.4 
80.4 
95.7 
94.8 
96.3 
During the test periods with rapeseecl oil the subjects ate on an 
average 43 grams of protein, 84 grams of fat, and 255 grams of car- 
bohydrates daily which were 80.4 per cent, 95.7 per cent, and 94.8 
per cent digested, respectively. Less than 3 per cent of the total fat 
eaten was supplied by the basal ration and approximately 82 grams 
of rapeseed oil was eaten by each subject daily. When allowance is 
made for that portion of the ether extract of the feces which has been 
shown to consist of metabolic products and undigested fat resulting 
from the basal ration the value 95.7 per cent obtained for the digesti- 
bility of the total fat of the diet becomes 98.8 per cent for the diges- 
tibility of rapeseed oil alone. 
In their reports of their physical condition during the test periods 
the subjects made no mention of any laxative effects resulting from 
the diet and accordingly it is assumed that the limit of tolerance for 
rapeseed oil is somewhat in excess of 84 grams, the average amount 
eaten daily by the subjects during the experiments here reported. 
CHARLOCK OIL. 
The charlock (Brassica arvensis) or wild mustard is rarely, if 
ever, cultivated in the United States, but in some localities it appears 
in the grainfielcls to such an extent that when the grain is thrashed 
large quantities of charlock seed are present in the grain. 
"When such grain is cleaned at the elevators wheat screenings or 
what is commonly referred to as " dockage " by the elevator men is 
obtained. These screenings ordinarily contain a wide variety of 
weed seeds, including charlock. The charlock is later separated 
from the other weed seeds by the feed dealers who buy the " dock- 
age'' to obtain the wild oats and other feed seed which it contains. 
It has been estimated that charlock seed is obtained in this way in 
sufficient quantities to warrant its use for commercial purposes. 
Charlock seed, when subjected to pressure, yields an oil very simi- 
lar in properties to some of the common edible oils, but has, when 
unrefined, a harsh, unpleasant taste. Bailey and Burnett 1 studied 
x Jour. Indus, and Eng-in. Chem., 8 (1916), No. 5, p. 429. 
