Metabolism Experiment No. 68. 



59 



fact more than twice as large. Furthermore, all the water was consumed before 

 4 p. m., which was unusual in these experiments. The quantity of water con- 

 sumed by A. L. L. was considerably less than that drunk by the subject of 

 experiment No. 59. 



Urine. 



In this experiment the urine was collected in four periods, from 7 a. m. to 

 1 p. m., 1 to 7 p. m., 7 to 11 p. m., and 11 p. m. to 7 a. m. This was done in the 

 hope that the analysis of the urine for different periods would throw some light 

 upon the rate of elimination of different ingredients in the urine; for while 



Table 22. Determinations in urine per period and per day Metabolism 



experiment No. 68. 



the collections were made more frequently in experiment ISTo. 59, with the 

 increased demands upon the time of the assistants, the analysis of urine for 

 short periods had been impossible. The amounts of urine and the specific 

 gravity, volume, reaction, and nitrogen, determined not only by periods but 

 also in the composite sample, are given in table 22. 



In addition to the data given in table 22, there were determined on the 

 daily composite samples the heat of combustion and on the composite for the 

 two days the heat of combustion, the water-free material, the carbon, the 

 hydrogen of organic matter, and the ash. The heat of combustion per gram 

 for the urine for April 27-28 was 0.092 calorie. For April 28-29 it was 0.117 

 calorie. The 2-day composite sample gave 94.94 per cent of water, 1.09 per cent 

 of carbon, 0.25 per cent of organic hydrogen, and 1.22 per cent of ash. 



