37 



Table 2'P>.— Results of digestion experiment Xo. J7^— Continued. 



Sample 

 No. 



Weight 

 I of 

 , material. 



Protein. 



^ , ' Carbo- i , , 

 ^"'- hvdrate.s. -^^"• 



Gram!<. \ Graith-f. i Grumg. ! Grams. 



Total amount digested \ I -138. 1 ! 388. 9 , 1, 540. 4 



Estimated digestible nutrients i I ' _, _ 



inbread '. 1^0.5 l,l/3.o 



Grams. 

 48.0 



Coefficients of digestibility of i Per cent. 



total food . 

 Estimated coefficients of diges- | 



tibility of bread 



Proportion of energy actually j 

 available to body: I 



In total food 



In bread alone 



Per cent. \ Per oitt. Per cent. ' Per cent. 



88.8 

 79.3 



97.0 



90.8 



8S.S 



47.7 



Heat of 

 combus- 

 tion. 



Calories. 

 12, 409 



Per cent. 

 91.6 



a 86.1 



87. .S 

 " 82. 9 



a Calculated according to the assumption that 90 per cent of the fat in the bread is digestible. 



During this experiment the subject eliminated 4,115.6 grams urine, 

 containing 60.91 grams nitrogen. The total nitrogen balance per day- 

 was therefore as follows: Income in food, 27.48 grams; outgo in urine, 

 20.30 grams, and in feces, 2.94 grains, implj'ing a gain of 4.24 grams 

 nitrogen, corresponding to 26.5 grams protein. 



DIGESTION EXPERIMENT NO. 315. 



Alnd of food— Milk, and bread made from straight liour. 

 Subjecf.-—M'An No. 1, as in experiment No. 309, 

 Weight,— At the Ijeginning and close of the experiment, 166 pounds. 

 Duration.— Yowv daj^s, with twelve meals, beginning with breakfast 

 April 28, 1902. 



T.-vBLE 24. — Re.'thlts of digestion e.cperiment Xo. -31.5. 



a Calculated according to the assumption that 90 per cent of the fat in the bread is digestible. 



