SULPHUROUS ACID AND SULPHITES. 893 



to inhibit the excretion of total nitrogen, but there is again an in- 

 crease in the quantity of nonmetabolized nitrogen excreted. 



The quantity of nitrogen consumed by No. 11 is exceptionally 

 large, amounting to more than 20 grams per day. The quantity 

 excreted in the feces is slightly greater in the preservative period than 

 in the fore period, while in the after period it is less than in the fore 

 period. There is a diminution, however, in the amount of nitrogen 

 excreted in the urine, while its loss is partially restored in the after 

 period. The total quantity of nitrogen excreted in the feces and urine 

 is markedly less in the preservative period. The balances are large in 

 all the periods and especially so in the preservative and after periods. 



The quantity of nitrogen consumed by No. 12 is slightly greater 

 in the preservative period and considerably less in the after period 

 than in the fore period. The amount excreted in the feces is decid- 

 edly less in the after period than in either of the other periods. The 

 quantity of nitrogen excreted in the urine is somewhat greater in 

 the preservative period than in the fore period and a greater quantity 

 is excreted in the feces and urine together than in the fore or after 

 periods. The nitrogen balance is positive in all cases, slightly less 

 in the preservative period and markedly less in the after period than 

 in the fore period. 



SUMMARIES. 



The summaries for the nitrogen balances, as for all of the principal 

 food elements, are submitted for Nos. 1 to 6, who received sodium.sul- 

 phite and are complete with the exception of the fourth preservative 

 subperiod. For Nos. 8 to 11, receiving sulphurous acid, the data 

 are complete for the entire observation. These two summaries are 

 discussed and compared, while the smaller summaries for Nos. 1 and 

 4, 5 and 6, and 7 and 12, and the partial summary for Nos. 7 to 12 

 are submitted without comment. 



In the summary for Nos. 1 to 6 the average daily amount of nitro- 

 gen consumed is 17.77 grams in the fore period, 17.42 grams in the 

 preservative period, and 16.71 grams in the after period. The aver- 

 age daily quantity of nitrogen excreted in the feces is 1.33 grams for 

 the fore period, 1.49 grams for the preservative period, and 1.25 

 grams for the after period. The average daily quantity of nitrogen 

 excreted in the urine is 15.12 grams in the fore period, 15.19 grams 

 in the preservative period, and 14.74 grams in the after period. The 

 total quantity of nitrogen excreted in the feces and urine is 16.45 

 grams in the fore period, 16.67 grams in the preservative period, 

 and 15.99 grams in the after period. These data show a slight 

 increase in the quantity of nitrogen excreted in the preservative 

 period, although the amount in the food is slightly less. In the 

 after period there is a decrease in the quantity of nitrogen in the food 



