102 



Influence of Inanition on Metabolism. 



nutrients, are shown as the difference between columns a and b in column c. 

 Column d repeats the nutrients and ash in terms of body material from 

 table 59. 



The agreement between the two sets of results shown in the table is quite 

 striking and the energy values are also singularly alike. The comparison, 

 however, is not as significant as it may at first sight seem, since it practically 

 is no more than a proof of the accuracy of the elementary analyses as compared 

 with the proximate analyses. Of the proximate analyses, that of protein rests 

 upon the same basis, namely, the determination of the element nitrogen in 

 both methods of calculation. The whole comparison (columns c and d, table 

 60) is, however, of value in indicating the probable accuracy of the different 

 factors used in computing the quantities of body material and their heat of 

 combustion. 



Table 61. Amounts of protein, fat, and glycogen absorbed 1 from food and energy 



of each 2 Metabolism experiment No. 10. 



1 In terms of body material. 



2 Factors for heat of combustion per gram of protein, 5.65 calories ; of fat, 9.54 calories ; 

 of glycogen, 4.19 calories. 



Energy of material absorbed from the food. As has been pointed out above, 

 the food absorbed is considered as body material. The energy of the materials 

 thus absorbed is readily computed by use of the heats of combustion given 

 on page 50. 



The results are given in table 61. 



Changes in Body-Weight Compared with Balance of Income and Outgo. 



The ingestion of food complicates somewhat the striking of the balance of 

 income and outgo for comparison with the actual changes in body-weight. 

 The data for this experiment are given in table 62. The income here consists 

 of food, water consumed, and oxygen, and the outgo of urine, feces, carbon 

 dioxide, and water of respiration and perspiration. The agreement between 

 the losses of body material and the actual loss in body-weight is thoroughly 

 satisfactory for the first two days; a very considerable discrepancy appears 

 in the comparison for the last day. 



In striking such a balance as appears in this table, it was necessary, 

 however, to take account of the actual weight of feces passed regardless of 



