18 BULLETIN 687, U. S. DEPARTMENT OF AGRICULTURE. 
average 82 grams of corn oil, 80 grams of soy-bean oil, 90 grams of 
sunflower-seed oil, 79 grams of Japanese mustard-seed oil, 82 grams 
of rapeseed oil, and 58 grams of charlock oil per person per day. 
After allowance had been made for the metabolic products and un- 
digested fat resulting from the basal ration, the coefficients of digesti- 
bility were found to be — for corn oil, 96.8 per cent ; for soy-bean oil, 
97.5 per cent; for sunflower-seed oil, 96.5 per cent; for Japanese 
mustard-seed oil, 98.8 per cent; for rapeseed oil, 98.9 per cent, and 
for charlock oil, 98.9 per cent. These values agree well with one 
another and with the values obtained with other vegetable oils in 
tests previously reported. 
No attempt was made to determine the limit of tolerance of the 
fats, but inasmuch as the subjects did not report any physiological 
disturbances as a result of eating these oils, except in experiments 
Nos. 615 and 616 with unrefined Japanese mustard-seed oil when a 
slight diarrhea was reported, it would appear that the limit of toler- 
ance for the oils was somewhat in excess of the amounts eaten. 
The carbohydrate eaten during these digestion experiments con- 
sisted largely of cornstarch, which was used as an ingredient of the 
blancmange, of sugar eaten both separately and as an ingredient of 
the blancmange, and of the carbohydrate which was supplied by the 
wheat biscuit. The coefficients of digestibility of the carbohydrate 
were 97 per cent in the corn-oil tests, 97 per cent in the soy-bean-oil 
tests, 97 per cent in the sunflower-seed-oil tests, 95 per cent in the 
Japanese mustard-seed-oil tests, 95 per cent in the rapeseed-oil tests, 
and 97" per cent in the charlock-seed-oil tests, which indicates that 
the oils under consideration exerted no unusual effect on the digesti- 
bility of carbohydrates. 
Considering the results of the digestion experiments as a whole 
it is evident that corn, soy-bean, sunflower-seed, mustard-seed, rape- 
seed, and charlock-seed oils are well assimilated and judged by 
their digestibility should prove satisfactory sources of fat for the 
dietary. 
