GO 



Influence of Inanition on Metabolism. 



Weight and composition of urine. The total weights of material excreted 

 in the urine are given in table 23. These include the total weight of urine, the 

 weight of water, solids, ash, organic matter, nitrogen, carbon, hydrogen in 

 organic matter, and oxygen in organic matter. The heat of combustion is 

 also given. 



As in experiment Xo. 59, the determinations of carbon and organic hydrogen 

 were made only on the 2-day composite, and hence it was necessary to apportion 

 the total amounts of carbon and organic hydrogen eliminated according to the 

 amount of nitrogen eliminated on the two days. In apportioning the amounts 

 of water and ash, which were also determined only in the 2-day composite, the 



Table 23. Weight, composition, and heat of combustion of urine Metabolism 



experiment No. 68 (April, WO-'t). 



Constituents. 



(a) Weight grams. . 



(6) Water do . . . 



(c) Solids, a b do... 



(d) Ash i do . . . 



(e) Organic matter, c d do . . . 



(/) Nitrogen do . . . 



(g) Carbon do . . . 



{h) Hydrogen in organic matter do. . . 



(i) Oxygen (by difference) in organic mat- 

 ter, e {f+g + h) do . . . 



(j) Heat of combustion calories. . . 



Apr. 27-28. 



1001.7 

 956.4 

 45.3 

 10.91 

 34.39 

 12.26 

 9.75 

 2.23 



10.15 

 92 



Apr. 28-29. 



843.8 

 795.7 

 48.1 

 11.6 

 36.50 

 13.03 

 10.37 

 2.38 



10.72 

 99 



Total 

 for 2 days. 



1845.5 

 1752.1 

 93.4 

 22.51 

 70.89 

 25.29 

 20.12 

 4.61 



20.87 

 191 



1 The ash and water for the individual days are calculated as shown on page 28. Hence the 

 amounts of solids and organic matter for the individual days are not determined but calculated. 



same processes were followed as those described in experiment ISTo. 59. The 

 amounts of ash and water for the individual days are affected by the errors in 

 the apportionment of the total solids. 



Elimination of Water- Vapor. 



The amount of water withdrawn from the respiration chamber by the venti- 

 lating air-current varies from period to period and depends in large measure 

 upon the absolute amount of water remaining in the chamber at the end of each 

 period and upon the rate of ventilation. Since as was explained in discussing 

 experiment No. 59 (see page 30) the relative humidity for each period may be 

 readily computed, in table 24 are recorded only the total amount of water- 

 vapor in the atmosphere of the calorimeter at the end of each period and the 

 total water of respiration and perspiration. 



On the two days the amount of water lost in respiration and perspiration was 

 essentially the same, there being 745.3 grams on the first day and 760.7 grams 

 on the second. 



