EXPERIMENT WITH MAN. 



183 



in column () , with a plus sign to indicate a gain and a minus sign a 

 loss in the residual amount in the air during the given period. The 

 total amount of carbon doxide given off by the subject, as shown in 

 column (d}, is the sum of the quantities in columns (<) and (c~). 



TABI,E 9. Record of Carbon Dioxide and Carbon in Ventilating Air Current, 



Metabolism Experiment No. 70. 



In computing the respiratory quotients given in Table 10, it is neces- 

 sary that the quantities of carbon dioxide exhaled by the subject be 

 expressed in volume rather than in weight. These values are shown 

 in column (<?) in Table 9, which are obtained from those in column (a?) 

 by the factor expressing the relation of volume to weight of carbon 

 dioxide. The quantities of carbon in the carbon dioxide exhaled by 

 the subject during each period, which are likewise used in computations 

 of later tables, are shown in column (/"). These values are calculated 

 directly from those in column (a 7 ). 



STATISTICS OF OXYGEN CONSUMED. 



The quantity of oxygen consumed by the subject during each period 

 is learned from the determinations of the quantity admitted from the 

 cylinders to the chamber and that remaining in the air at the end of the 

 period. These data are summarized in Table 10. 



The amount of oxygen supplied during each period is determined by 

 the loss in weight of the cylinder between the beginning and end of the 

 period and the purity of the oxygen in the cylinder, and is recorded 

 in column (d). 



