Recovery after Inanition. 539 



of nitrogen metabolism experiment No. 1 and it was also much higher than 

 during fasting experiment No. 77. On all save the first day of the first week 

 there was a gain of sulphur; the average gain for the first week was 0.658 

 gram against 1.605 grams for the corresponding week of the first experiment; 

 the average gain per day for the 6 days of the second week of the second experi- 

 ment was 0.876 gram. 175 



Comparison of gains or losses of nitrogen, phosphorus, and sulphur. With 

 such marked gains to the body of nitrogen, phosphorus, and sulphur as were 

 observed during both of these experiments, it is of interest to compare the 

 gains or losses on different days and consequently the results are recorded in 

 table 258 herewith. 



By comparing the gains in nitrogen and phosphoric acid, it is seen that 

 there is little regularity in the proportions gained during the first week. 

 For example, on the second day there is a gain of over 9 grams of nitrogen 

 and 10.5 grams of phosphoric acid, while on March 18, with a gain of 13.9 

 grams of nitrogen, there is a gain of a little over 5 grams of phosphoric acid. 

 The amounts of sulphur trioxide gained likewise bear little, if any, relation to 

 either the nitrogen or the phosphorus. During the second experiment the 

 gains are all much less than during the first, but here also there is no clear 

 relationship established between the gains or losses of nitrogen, phosphorus, 

 and sulphur so far as the individual days are concerned. 



Ratios of nitrogen to phosphorus and nitrogen to sulphur of material gained. 

 The computed gains of nitrogen, phosphorus, and sulphur may be used to 

 obtain the ratios between nitrogen and phosphoric acid and nitrogen and sul- 

 phur. These ratios are of interest in discussing the question of the nature of 

 the material gained. Since the method of apportionment of the nitrogen, 

 phosphoric acid, and sulphur of the feces on the different days makes the accu- 

 racy of the daily gains or losses doubtful to a certain extent, the ratios are 

 computed per week only. In the first nitrogen metabolism experiment, the 

 ratios of nitrogen to phosphorus pentoxide for the 4 periods were 1.19, 2.27, 

 3.89, and 1.37. In the second nitrogen metabolism experiment, the ratios of 

 nitrogen to phosphorus pentoxide were 2.16 and 4.83, respectively. 



175 Balance of income and outgo of sulphur (S) and phosphorus (P) in food and 

 feces, of experiments Nos. 70, 72, 74, and 76. It was impracticable to determine 

 sulphur in all the foods used in the calorimeter experiments and hence no attempt 

 was made to estimate the absolute intake of sulphur. Similarly, in the feces of 

 some of the experiments, especially No. 70, unsatisfactory determinations of sulphur 

 were obtained. The results of sufficient accuracy to warrant publication are as 

 follows: The total feces for the 3 days of experiment No. 74 contained 0.104 gram 

 of sulphur (S), and 0.812 gram of phosphorus (P). The phosphorus intake in the 

 food of experiment No. 74 was 1.26 grams per day. In experiment No. 70, there was 

 a total phosphorus intake for the 3 days of 4.51 grams, while the phosphorus output 

 in the feces was 3.25 grams. The phosphorus intake of the food of experiment No. 

 76 was 1.06 grams per day, and the total output in the feces for the 3 days was 

 2.18 grams. 



