May, 1918.1 



Digestibility of Soy Bean Meal 



281 



EXPERIMENT I. 



The subject was a healthy man, aged 3<S, weight 150 pounds, 

 engaged in moderately active laboratory work each day. Since, 

 obviously, it is impossible to consume with relish an exclusive 

 diet of soy bean meal, a mixed diet was selected containing a 

 few articles of known digestibility in addition to soy bean meal, 

 the chief constituent. The feces from the three-day experi- 

 mental period were marked off with lampblack taken with the 

 appropriate meals. Soon after collection of the stools they were 

 moistened with alcohol containing a little sulphuric acid, dried 

 on the steam bath, brought to an air-dry condition by exposure 

 to the atmosphere of the laboratory and finely ground. Protein 

 was determined by the Kjeldahl method (N x 6.25) ; fat by the 

 method of Gephart and Csonka,'' nitrogen-free extract, fiber 

 and ash by the ordinary routine methods.^" 



The soy bean meal used in this experiment had the following 

 composition : 



Moisture 6.5 percent 



Ash 5.7 



Protein 44.1 " 



Crude Fiber 5.9 



Fat 3.3 



N-free Extract 35.5 " 



Two hundred grams of this meal were mixed with 400 

 grams of patent wheat fiour and 10 grams of sugar and made 

 into yeast-raised bread. This bread was of good texture and 

 highly palatable. 



The diet for the three days was as follows, approximately 

 one-third being consumed each day. 



