472 



Mr. W. North. The Influence of 



The average daily elimination by urine and faeces combined is : 

 first four days, 16*64 grams ; last five days, 17*88 grams. 



Despite this increased discharge, there were remaining in the body 

 2*77 grams of nitrogen known to have been taken in as food. The 

 figures of Table E are interesting, as showing that up to the day of 

 work the body was steadily accumulating nitrogen, which was as 

 steadily given out in the period after the work ; it is perhaps a matter 

 of regret that the experiment was not prolonged for a few days, in 

 order to observe whether the ratio of the ingesta to the excreta would 

 have returned to that existing bef ore the work. It is worthy of remark 

 that though the exercise increased the discharge, the amount of nitro- 

 gen retained in the body during the period after the work was greater 

 than before it. 



The average daily discharge by the fa3ces was : first four days, 

 2*48 grams ; last five days, 215 grams, clearly pointing to increased 

 absorption by the intestines. 



The Phosphoric Acid. — Comparison of the ingesta and excreta shows 

 an excess in the latter of 2*60 grams. There can be, I think, but 

 little doubt that this was due to the diet before the experiment com- 

 menced, the difference in the P 2 5 of the ingesta and excreta for the 

 first four days, i.e., the period before the work, being 2' 72 grams, after 

 the work the daily discharge was 3*84 grams, and the daily entry 

 3 87 grams, or, allowing for error of experiment, practically the same, 

 since it would appear from the consideration of the phosphoric acid, 

 that the effect of the work was to regulate the daily discharge. 



The agreement of the figures may be accidental, but considering 

 that they are the sum of a number of separate analyses, this can 

 hardly be the case, and this I think tends to justify the distribution 

 of the faeces according to the plan which I have adopted. 



The sulphuric acid was undoubtedly increased after the work to the 

 extent of 0*24 gram per diem. The bulk of this excess was excreted 

 on the day of work itself, as the following figures show : — 



Daily average. 



H 2 S0 4 four days before work 2*76 grams. 



H 2 S0 4 fours days after work 2*88 



H 2 S0 4 day of work ... 3*48 „ 



that" is, an increase on the day of work of 0*66 gram above the 

 average of the whole of the rest of the experiment. 



