Metabolism Experiment No. 74. 



165 



Percentage composition of food and feces. The percentage composition and 

 heat of combustion per gram of food and feces are given in table 115. The 

 amounts of food and feces and the elements and nutritive ingredients, of which 

 they consisted, together with the heat of combustion, are shown in table 116. 



Elements and materials absorbed from food. From the analyses of the food 

 and feces, the amounts of nitrogen, carbon, hydrogen, oxygen, and ash of the 

 absorbed food were obtained. Since the food was identical on all 3 days, and 

 since the total amount of feces belonging to the experiment was apportioned 

 equally among the different days of the experiment, the only variations in the 

 quantities of elements absorbed on the different days were such as occurred 



Table 117. Elements absorbed from food Metabolism experiment No. 14. 



J For February 3, the amounts of hydrogen and oxygen absorbed are 289.30 and 2175.61 

 grams respectively ; for February 4, the corresponding amounts are 256.59 and 1916.02 grams. 



as a result of different amounts of water drunk. The elements absorbed on 

 February 2 are shown in table 117, and to avoid repetition, the amounts of 

 hydrogen and oxygen absorbed on the second and third days of the experiment 

 are given in a note following the table. 



As has been explained in considering previous experiments, the quantities 

 of absorbed material are computed in terms of body protein, body fat, and 

 glycogen, by means of the formulas given on page 38. The results show that 

 on the first day there were absorbed 35.70 grams of protein, 133.80 grams of 

 fat, and 131.52 grams of carbohydrate. Although there were fluctuations in 

 the quantity of water consumed on the two subsequent days, the quantities of 

 nitrogen, carbon, hydrogen of organic matter, and oxygen of organic matter 

 were constant on all days, and the same amounts of materials were absorbed 

 from the food daily. In carrying out the calculations by means of the formulas, 

 however, slight differences are obtained in the amounts of fat and carbohy- 



