6 BULLETIN 687, IT. S. DEPARTMENT OF AGRICULTURE. 
On an average the subjects ate 26 grams of protein, 80 grams of 
fat, and 398 grams of carbohydrates. The fuel value of the diet 
was 2,415 calories. The total fat of the diet, approximately 97 per 
cent of which was corn oil, was 93.5 per cent digested. When the 
usual correction for the undigested fat of the basal ration and meta- 
bolic products is made, the value 93.5 per cent for the digestibility 
of the total fat of the diet becomes 96.9 per cent for the digestibility 
of corn oil alone. In these as in all other tests, except those with 
charlock oil, the fat-rich blancmange was eaten readily and without 
comment, showing that the oil as used was not unpalatable. The 
proteins and carboh} T clrates supplied by the diet were 63 per cent and 
97 per cent digested, respectively, values which correspond with those 
obtained for these constituents in earlier experiments of this series. 
In the reports which the subjects submitted regarding their physi- 
cal condition during the experimental periods, no reference was made 
to an} 7 laxative effect resulting from the diet. On the basis of the 
results of the tests reported it may be reasonably concluded that re- 
fined corn oil, when eaten in amounts comparable with the amount of 
fat occurring in the average dietary, served satisfactorily for food 
purposes. 
SOY-BEAN OIL. 
The soy bean {Glycine soja) , prepared in a variety of ways, has 
long been a staple article of diet in the oriental countries, ranking 
very close to rice in order of importance. As a result of the long- 
continued use of this legume for food purposes, the oriental peoples 
have developed many special ways of using the protein and carbo- 
hydrate of the soy bean, some with and some without the oil. 
Though used for fuel and illuminating purposes in the Orient, much 
less attention seems to have been given to the dietary use of the sepa- 
rated soy-bean oil. 
In the United States constantly increasing quantities of soy beans, 
imported from the Orient or produced for the most part in the cot- 
ton-growing districts, are pressed in the cottonseed-oil mills. The 
oil is largely used for technical purposes, especial attention having 
been given to its use as a paint oil. T\ T ork which has been done 
indicates that the characteristic odor and taste of the crude oil can 
be nearly, if not entirely, eliminated by careful refining and that 
the refined oil may be used for food purposes. 
Korenchevsky and Zimmerman x made a study of the digestibility 
of soy-bean oil when eaten with a basal ration of rye bread, cabbage 
soup, and buckwheat or millet cooked as porridge. Three soldiers 
of normal health served as subjects and ate 100 grains of soy-bean 
1 Viestnik Obshch. Hig., Sudeb. i Prakt. Med., 1905, pp. 690-693. 
