?36 INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



of soda, and afterwards a summary of the four subjects. In discussing 

 these summaries attention will be directed mainly to the important 

 points of the disturbance of the nitrogen metabolism, the influence 

 of the preservative upon the amount of uric acid and the other princi- 

 pal nitrogenous bodies of the urine excreted, and the distribution of 

 the nitrogen among the nitrogenous, elements of the urine. 



Viewing Nos. 1 and 2 together, it is found that there is a slight 

 decrease in the volume of the urine during the preservative period, 

 and a decrease again occurs during the after period. The total solids 

 in the urine are almost the same in the fore and preservative periods, 

 and are somewhat diminished in the after period. The total weight 

 of the nitrogen in the urine is slightly diminished in the preservative 

 period, and this diminution is still more marked in the after period. 

 The quantity of urea nitrogen excreted in the preservative period is 

 slightly less than that in the fore period, and this deficiency is very 

 marked in the case of the after period. 



There is a tendency shown to diminish the amount of nitrogen 

 excreted as uric acid in the preservative period. There is a slight 

 increase in the amount of nitrogen excreted as kreatinin during the 

 preservative period, while there is a slight decrease in the amount of 

 nitrogen excreted as ammonia. 



The total quantity of urea excreted is less in the preservative period 

 and is still further diminished in the after period. The weight of the 

 uric acid is slightly diminished during the preservative period and 

 remains unchanged in the after period. 



The total weight of kreatinin is greater in the preservative period 

 than in the fore period and less in the after period than in the fore 

 period. There is less ammonia excreted during the preservative 

 period, while in the after period the amount is almost the same as in 

 the fore period. Of the nitrogen ingested 84.84 per cent is excreted 

 in the urine in the fore period, 81.87 per cent in the preservative 

 period, and 74.42 per cent in the after period. 



In regard to the distribution of the nitrogen among the various 

 nitrogenous elements of the urine, it is noticed that there is no appre- 

 ciable disturbance in the percentage appearing as urea, there being 

 92.6 per cent in the fore period, 92.3 per cent in the preservative 

 period, and 92.3 per cent in the after period. The percentage of 

 nitrogen appearing as uric acid is slightly less in the preservative 

 period. In the after period it is the same as in the fore period. A 

 somewhat larger percentage of nitrogen is found as kreatinin in the 

 preservative period and a slightly less percentage as ammonia. 



