296 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Table VIII. — Amount, spi cific gravity, and nilrogi n of urine by 6-hour pi nods — -1/. tabolism ■ vp< r'mu ni No. IS. 



Table IX. — Daily elimination of carbon, hydrogen, water, and energy in urine — Metabolism experiment No. 12. 



"The heat of combustion of the urine was determined in the composite sample for each day and in the total com- 

 posite for four days. The total heat of combustion of the urine for the experiment, as determined in the latter sam- 

 ple, was 0.112 calorie per gram, or a total of 519 calories. 



Carbon dioxid mul water of respiration and perspiration. — The determinations of carbon 

 dioxid and water in the ventilating air current in this experiment are shown in Tables XI and 

 XII, which follow. Table X gives the total amounts of carbon dioxid and of water in the air 

 of the chamber at the close of each period and the gain or loss during the period. Differences 

 in the amounts in the chamber at the beginning and end of a given period — •■residual" amounts, 

 as they are here termed — indicate whether the ventilating air current has removed more or less 

 carbon dioxid and water than was actually exhaled by the subject dining the corresponding 

 period. For instance, if a change from rest to work is made during a given period, the 

 quantities of carbon dioxid and water given off will be increased, and the air remaining in the 

 chamber at the end of the period will contain a larger amount of these products than was present 

 in the air of the chamber at the beginning. This increase must be added to the amount actually 



