DIGESTIBILITY AND AVAILABILITY OF FOOD. 



20I 



DETAILS OF DIGESTION EXPERIMENT NO. 1 48. 



This experiment, the second period of metaboHsni experi- 

 ment No. 25, began with breakfast January 23, 1900, and 

 continued three days. The subject, J. F. S., weighed the 

 same at the end as at the beginning, 63.8 kilos. As this was 

 a rest experiment he remained quiet while in the respiration 

 chamber. The diet contained an excess of fat. 



Table ioi. 

 Digestion experiment No. 1^8. 



During this experiment the subject eliminated 3738.0 grams 

 urine, containing 49.2 grams nitrogen. The average nitrogen 

 balance per day was therefore as follows : Income in food, 17.7 

 grams; outgo in urine, 16.4 grams, and in feces, i.o grams; 

 implying a gain of .3 gram nitrogen, corresponding to 1.9 

 grams protein. 



