1 90 



A RESPIRATION CALORIMETER. 



BODY WKIGHT. 



The figures of Table 12 imply that the body lost 164.78 grams of 

 material during the experiment. If there were no experimental errors 

 the body should have weighed 164.78 grams less at the end than at the 

 beginning of the experiment. This calculated balance was checked 

 by actual weighings of the body. 



TABL,E 14. Balance of Gains and Losses of Body Material and Gain and Loss o/ 

 Body Weight, Metabolism Experiment No. 70. 



The platform balance, with weighing arrangements, shown in figure 

 46, was used in this experiment for checking the body weights, and in 

 the next to the last column of Table 14 we have the exact loss in weight 

 as recorded on this particular day by this balance. As a matter of fact, 

 it is seen that the loss in weight as recorded by the balance was in 

 grams, which differs somewhat from the amount computed from the 

 figures in Table 12, i. e., 164.78 grams. In this connection it may be 

 stated that the experimental routine, especially with reference to the 

 weighing, was not in a satisfactory condition on the date on which this 

 experiment was made, and consequently the corrections for the differ- 

 ences in amount of urine passed each day at 7 a. m. before the actual 

 weighing account in large measure for the discrepancy noted above. 



In Table 14 the balance of intake and output of material in grams 

 is given, and from these figures the loss of body material is calcu- 

 lated to be 117.66 grams, making, therefore, an actual discrepancy 

 between that computed and that found by the platform balance equal 

 to 6.66 grams. 



Subsequent experience with the platform balance has shown that 

 with a perfected technique the agreement between the computed gain 

 or loss of body material and that actually found is very close. 



INTAKE AND OUTPUT OF ENERGY. 



Table 15 summarizes the data regarding the intake and output of 

 energy in the body during this experiment. 



