DIGESTIBILITY AND AVAILABILITY OF FOOD. 



209 



DETAILS OF DIGESTION EXPERIMENT NO. 1 58. 



This experiment, a part of metabolism experiment No. 32, 

 began with breakfast April 20, 1900, and continued three days. 

 There was an excess of fat in the diet. The subject, J. F. S., 

 weighed in underclothes at the beginning 66.2 kilos and at the 

 end 64.9 kilos. He worked eight hours each da}' upon the 

 stationary bicycle. 



Table 109. 

 Digestion experiment N'o. 1^8. 



During this* experiment the subject eliminated 3829.6 grams 

 urine, containing 46.0 grams nitrogen. The average nitrogen 

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

 16. 1 grams; outgo in urine and perspiration, 15.7 grams, and 

 in feces, 1.2 grams; implying a loss of .8 gram nitrogen, cor- 

 responding to 5.0 grams protein. 



