Metabolism Experiment No. 75. 



177 



Table 123. Determinations in urine per period and per day Continued. 



recorded in table 124. In addition to the elements and compounds determined 

 in experiment No. 73, inorganic and ethereal sulphur, the so-called neutral 

 sulphur, the preformed creatinine, and creatine were determined. Unfor- 

 tunately, determinations of uric acid were impracticable. Phosphoric acid 

 was determined both by fusion and titration and the results by both methods 

 are recorded. The phosphorus, sulphur, and chlorine are expressed as phos- 

 phoric acid, sulphur trioxide, and sodium chloride, respectively. A few 

 determinations could not be made owing to the quantities or condition of the 

 samples. 



Elimination of Wateb-Vapob. 



The elimination of water-vapor was measured in the usual manner. The 

 changes in weight of chair, bedding, and other articles are given as usual in a 

 note at the foot of table 125, page 179. Aside from a slight gain in weight of 

 these articles on March 6, there was a continual loss in weight due to the evapo- 

 ration of water in the unusually dry atmosphere inside the respiration chamber. 

 The figures given in column a show that the amount of moisture in the cham- 

 ber was considerably less at the end of the experiment than at the beginning. 



The total water of respiration and perspiration remained practically constant 

 for the first 3 days of the experiment. On the next 2 days there was a 

 gradual diminution. The lowest elimination was on the sixth day and this 

 was exceeded by only 1 gram on the seventh. 



Cutaneous excretion of nitrogenous material. During the 7 days of this 

 experiment and the 3 days of the food experiment following, the subject 

 eliminated through the skin a total of 0.537 gram of nitrogen, a daily average 

 of 0.054 gram. 

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