892 INFLUENCE OF FQ.OD PRESERVATIVES ON HEALTH. 



even more marked in the after period. The total quantity of nitro- 

 gen excreted during the preservative period is very considerably 

 increased over the fore period and is exactly the same as that excreted 

 during the after period. The nitrogen balance in the fore period is 

 abnormally large and positive. It is still large and positive in the 

 preservative period, though only about one-half the magnitude of the 

 fore period. Lrthe after period it is somewhat larger than in the pre- 

 servative period. 



The data in the case of No. 7 for the nitrogen balance are incom- 

 plete, on account of the absence of any data for the after period, and 

 for the further reason that only three subperiods of the preservative 

 period are considered. These data therefore are of little or no value 

 for comparative purposes. 



The quantity of nitrogen in the food in the case of No. 8 is quite 

 uniform in all the periods. The quantity excreted in the feces is 

 almost the same for the fore and preservative periods and slightly 

 less for the after period. The quantity of nitrogen excreted in the 

 urine is slightly greater in the preservative period and is^ncreased 

 agarin in about a like proportion in the after period. The quantity 

 in the feces and urine together is increased to a slight extent in the 

 preservative period and also in the after period. The balance in the 

 fore period is positive and amounts to 1.06 grams daily. It is also 

 positive in the preservative period and amounts to 0.88 gram. In 

 the after period the balance is again somewhat diminished and is 0.71 

 gram. 



The quantity of nitrogen excreted in the feces of No. 9 in the fore 

 period is very low and the positive balance, therefore, is exceptionally 

 high. There is a notable increase in the nitrogen excreted during the 

 preservative period, being over 1 gram per day more than in the fore 

 period, and in the after period there is still an increase. The balance 

 in the preservative period is positive and more nearly normal than in 

 the fore period. There is a further diminution in the magnitude of 

 the balance in the after period. The decrease in the positive balance 

 in the preservative period appears to be due to a considerable increase 

 in nitrogen katabolism, and in the after period the decrease in the 

 balance is even more marked. This indication is further borne out 

 by the percentage figures for the preservative period, while in the 

 after period the greater elimination is in the feces. 



The balances in the case oi No. 10 are all unusually large, amount- 

 ing to 2.55 grams daily in the fore period, 3.08 grams daily in the pre- 

 servative period, and 2.17 grams daily in the after period. A larger 

 quantity of nitrogen is excreted in the preservative period in the feces 

 than in the fore period, but the opposite is true of the nitrogen in the 

 urine, which is very largely decreased in the preservative period. The 

 data in this case indicate a tendency on the part of the preservative 



