738 INFLUENCE OP FOOD PRESERVATIVES ON HEALTH. 



There are excreted 14.12 grams of total nitrogen daily in the urine 

 for the fore period, 13.96 grams in the preservative period, and 13.41 

 grams in the after period, showing a gradual decrease in the total 

 amount of nitrogen excreted. 



The average daily amount of nitrogen excreted as urea in the fore 

 period is 12.94 grams, in the preservative period 12.73 grams, and 

 in the after period 12.31 grams, showing a progressive decrease in 

 the amount excreted. 



In the case of uric acid, the amount excreted in the preservative 

 period is less than in the fore period, and returns to the amount of the 

 fore period in the after period. 



Respecting the quantity of the kreatinin, the amount excreted in 

 the preservative period is slightly increased both over that of the 

 fore period and the after period, while in the case of ammonia the 

 amount of nitrogen excreted is less in the preservative period than in 

 either of the other periods. 



In regard to the quantity of the various nitrogenous constituents, 

 it is seen that 27.69 grams of urea are excreted daily in the fore 

 period, 27.26 grams in the preservative period, and 26.36 grams in the 

 after period. 



In the case of uric acid, less is excreted in the preservative period 

 than in the fore period, and also less than in the after period. 



The quantity of kreatinin is remarkably constant throughout, but is 

 slightly increased in the preservative period over both the fore and 

 the after periods. 



In regard to the percentage of excretion of the nitrogen, it is seen 

 that of the total nitrogen in the food 84.4 per cent appears in the urine 

 in the fore period, 82.1 per cent in the preservative period, and 78.9 

 per cent in the after period. 



The percentage of nitrogen excreted as urea does not appear to be 

 appreciably affected by the administration of the preservative. 



The percentage of nitrogen appearing in the preservative period as 

 uric acid is slightly less than in the fore period, and also less than in 

 the after period. 



The percentage of nitrogen excreted in the urine as kreatinin is 

 increased in the preservative period over both the fore and the after 

 periods. 



In the case of ammonia, the percentage of nitrogen excreted is 

 decreased in the preservative period as compared with both the fore 

 and the after periods. 



The most important points brought out in the preceding discussion 

 are as follows: 



1. Salicylic acid and salicjdates tend not only to diminish the quan- 

 tity of uric acid eliminated, but also to decrease its relative percentage 



