52 l 



Influence of Inanition on Metabolism. 



If the nature of the foods ingested and the imperfect method of separation 

 of feces as well as the short duration of the experiments are taken into con- 

 sideration, an examination of the results of these digestion experiments shows 

 no abnormality. It is, therefore, impossible to distinguish from the data any 

 effect of inanition on the digestibility of the kinds of food here ingested during 

 these short experiments. 



digestibility of food in the nitrogen metabolism experiments. 



In the long feeding experiments which immediately followed food experi- 

 ment No. 76 and fasting experiment No. 77, it was possible to study only the 

 absorption of protein and energy. Pressure of other work prevented the com- 

 plete analysis of both food and feces, and since these digestion experiments are 

 at best but approximate, it was deemed inadvisable to sacrifice other important 

 determinations. The digestibility or absorption, computed in the usual man- 

 ner, is recorded in table 246 for both nitrogen metabolism experiments. The 

 feces were separated at the end of each week. The first nitrogen metabolism 

 experiment continued 25 days, while the second experiment lasted 2 weeks. 

 The coefficients of digestibility for each week during the experiments have 

 been computed. 



Table 246. Digestibility (availability) of protein and energy in nitrogen metabol- 

 ism experiments Nos. 1 and 2. 



Food. 



Feces. 1 



Absorbed 



Energy 



of 

 urine. 2 



Energy 

 avail- 

 able. 



Per cent 

 digested 



Average 



for 



whole 



experi- 

 ment. 



Nitrogen Metabolism Experi- 

 ment No. 1. 

 Mar. 14 to 20, 1905 : 



Total weight kilos.. 



Protein grams.. 



Energy calories . . 



Mar. 21 to 27, 1905 : 



Total weight kilos.. 



Protein grams.. 



Energy calories.. 



Mar. 28 to Apr. 3, 1905 : 



Total weight kilos.. 



Protein grams.. 



Energy calories . . 



Apr. 4 to 7, 1906 : 



Total weight kilos.. 



Protein grams . 



Energy calories.. 



Nitrogen Metabolism Experi- 

 ment No. %. 

 Apr. 12 to 18, 1905: 



Total weight kilos... 



Protein grams 



Energy calories... 



Apr. 19 to 25 : 



Total weight kilos... 



Protein grams... 



Energy calories... 



24.476 

 923.67 

 38,700 



23.096 

 953.70 

 39,193 



19.687 

 760.39 

 27,118 



9.658 

 391.75 

 14,996 



18.271 

 858.01 

 23,764 



19.141 



849.31 

 23,445 



0.395 

 102.70 

 2011 



.664 

 169.72 

 3417 



.443 

 121.83 

 2297 



.234 



63.18 

 1082 



.349 

 107.77 

 1667 



.358 

 103.39 

 1713 



820.87 

 36,689 



783.98 

 35,776 



638.56 

 24,821 



3-J8.57 

 13,913 



750.24 

 22,097 



745.92 

 21,732 



668 



666 



718 



427 



890 



787 



36,021 

 35,ii6 

 24J03 



13,486 



21,207 



20',946 



88.9 

 93.1 



82.2 

 89.6 



84.0 



88.9 



83.9 

 89.9 



87.4 

 89.2 



87.8 

 89.3 



84.9 

 90.4 



(7.6 

 S9.3 



1 Partially dried. 



2 Energy of urine assumes 9 calories for each gram of urinary nitrogen. 



