SULPHUBOUS ACID AND SULPHITES. 891 



negative in the fore period, but by an extremely small amount, 

 namely, 0.02 gram. The balance in the preservative period is posi- 

 tive and quite large, namely, 1.16 grams. In the after period the 

 balance is also positive and amounts to 1.03 grams. The data show 

 a decreased excretion of nitrogen during the preservative period, 

 which is due to the decrease in metabolized nitrogen, and this inhibi- 

 tion is continued, though not to the same extent, in the after period. 



With No. 3 the average daily quantity of nitrogen ingested is some- 

 what greater in the preservative period and notably greater in the 

 after period than in the fore period. This, however, is riot sufficient 

 to account for the increase in the excretion of the nitrogen, both in the 

 feces and in the urine, during the preservative period. There is a 

 large positive nitrogen balance in the fore period, which is diminished 

 almost one-half in the preservative period and is doubled in the after 

 period, where the balance appears to be abnormally high. These 

 data indicate an increased excretion of nitrogen during the preserva- 

 tive period in a larger quantity than would be due to the increase in 

 the amount of nitrogen ingested. This is especially true of the 

 unmetabolized nitrogen. 



The amount of nitrogen consumed by No. 4 is slightly larger in the 

 preservative period and after periods than in the fore period. The 

 quantity excreted in the feces is increased, both in the preservative 

 and after periods, over the fore period. The quantity excreted in the 

 urine is markedly diminished in the preservative period. The total 

 quantity excreted in the feces and urine is very considerably dimin- 

 ished in the preservative period and is almost the same in the fore 

 and after periods. The nitrogen balance in the fore and after periods 

 is large and negative; in the preservative period it is small and nega- 

 tive. In this case there is a marked decrease in elimination of nitro- 

 gen during the preservative period, though the quantity of nonmetab- 

 olized nitrogen excreted is increased. 



The data for No. 5 are incomplete, for reasons already stated. No 

 comparison can be made between the fore period and the after period, 

 and the figures for the balance have no signification for comparative 

 purposes. The tendency shown in three of the preceding cases to 

 increase the excretion of non-metabolized nitrogen is again shown. 



The quantity of nitrogen consumed by No. 6 is slightly less in the 

 preservative period than in the fore period and is slightly greater in 

 the after period than in th*e preservative period. The quantity of 

 nitrogen found in the feces is very materially increased in the pre- 

 servative period, although the amount of nitrogen in the food is 

 diminished. In the after period the quantity in the feces is almost 

 the same as in the fore period. The quantity of nitrogen in the urine 

 is also very considerably increased in the preservative period, being 

 1.67 grams per day greater than in the fore period. This increase is 



