40 



Table 27. — Results of digestion experiment No. .'US — Continued. 



Sample 

 No. 



Weight 



of 

 material. 



Coefficients of digestibility of Per cent. 



total food 



Estimated coefficients of digest- 

 ibility of bread 



Proportion of energy actually 

 available to body: 



In total food 



In bread alone 



Protein. 



Per cent. 

 92.8 



8fi. S 



IFat. 



Per cent. 

 97.0 



Carbo- 

 hvdrates. 



Per ce)tt. 

 93.5 



92.2 



Ash. 



Per cent. 

 56.3 



Heat of 

 combus- 

 tion. 



Per cent. 

 93.4 



"91.3 



89.3 

 o 87. 9 



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



During- this experiment the subject eliminated 7,889.1 grams urine, 

 containing- 84:.-il grams nitrogen. The total nitrogen balance for four 

 da3^s was therefore as follows: Income in food, 27.92 grams; outgo in 

 urine, 21.10 grams, and in feces, 2.06 grams, implying a gain of 4.76 

 grams nitrogen, corresponding to 29.8 grams protein. 



DIGESTION EXPERIMENT NO. 319. 



JTind of food. — Milk, and bread made from entire- wheat flour. 



Siibject. — Man No. 2. as in experiment No. 310. 



Weight. — At the beginning- and close of the experimwit, 167.5 

 pounds. 



Duration. — Four days, with twelve meals, beginning with breakfast 

 May 5, 1902. 



Table 28. — Results of digestion experiment No. 319. 



During this experiment the subject eliminated 6,910.1 grams urine, 

 containing 101.58 grams nitrogen. The total nitrogen balance per day 

 was therefore as follows: Income in food, 28.21 grams; outgo in urine, 



