Metabolism Experiment No. 101. 



17 



Urine. 



For 3 days prior to entering the chamber the subject had saved the urine, 



but of these days only the last was during actual observation in the laboratory. 



The total amount of nitrogen was determined on each sample. During the 



sojourn inside the respiration chamber the collection of urine was subdivided 



Table 5. Weight, specific gravity, and nitrogen of urine 

 Metabolism experiment No. 101. 



1 Presumably for total 24 hoars, 

 coming to the laboratory. 



2 Energy 62 calories, determined. 



Subject made collection of urine before 



into 4 periods of 6 hours each as is customary in experiments of this nature. 

 As a check on the accuracy of the analyses the total nitrogen for each of these 

 periods was determined and also in a composite sample. A portion of the 

 urine Avas dried and burned in a calorimetric bomb to determine the heat 

 of combustion. This was found to correspond to 0.160 calories per gram and 

 the total energy of the urine for the day, therefore, was 62 calories. The 

 results are given in table 5. 



Elimination of Water-Vapor. 

 The amount of water vaporized in the different periods during the experi- 

 ment is given in table 6. An examination of the residual amounts of water- 

 vapor inside the chamber shows that there was a slight tendencv for the air 



