890 INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



METABOLIC PROCESSES. 



The effect of the preservative upon the metabolic processes is 

 shown in the balance sheets made for the principal food elements, 

 namely, nitrogen, phosphoric acid, sulphur, fat, calories, and total 

 solids. The data include the amounts of food ingested, by periods and 

 subperiods; the absolute quantities and percentage amounts of the 

 respective elements excreted in the feces and the urine, and the 

 balance, together with a statement as to the amounts of preservative 

 administered. 



NITROGEN BALANCE. 

 INDIVIDUAL DATA. 



The average daily quantity of nitrogen consumed by No. 1 is 17.58 

 grams in the fore period, 16.97 grams in the preservative period, and 

 16.95 grams in the after period. Of this quantity, there appear in the 

 feces 1.26 grams, 1.14 grams, and 0.73 gram, respectively, for the 

 three periods; and in the urine 16.06 grams, 14.89 grams, and 15.37 

 grams, respectively. The total quantity of nitrogen recovered in the 

 feces and urine is 17.32 grams, 16.03 grams, and 16.10 grams, daily, 

 respectively, for the three periods. Calculated to percentage, it is 

 seen that of the total nitrogen in the food 7.19 per cent appears in the 

 feces in the fore period, 6.74 per cent in the preservative period, and 

 4.34 per cent in the after period; and in the urine, 91.38 per cent in 

 the fore period, 87.74 per cent in the preservative period, and in the 

 after period, 90.64 per cent. The nitrogen balance for all three 

 periods is positive and amounts to 0.26 gram in the fore period, 0.94 

 gram in the preservative period, and 0.85 gram in the after period. In 

 this case it is noticed that there is a smaller quantity of nitrogen 

 recovered in the excreta during the preservative period and therefore 

 a greater nitrogen balance. By reason of the abnormally low amount 

 of nitrogen recovered in the feces in the after period the balance for 

 that period is only slightly less than for the preservative period. 



In the case of No. 2 the data for the preservative period is not 

 complete, including only the first, second, and third subperiods. 

 There is little variation in the amount of nitrogen ingested in this case, 

 it being slightly greater, however, in the preservative period. The 

 quantity recovered in the feces is almost exactly the same in the fore 

 and after periods and is slightly greater in the preservative period. 

 The quantity recovered in the urine is practically the same in the 

 preservative and after periods, being somewhat less than in the fore 

 period. Of the total amount of nitrogen recovered in the feces and 

 urine it is seen that a less quantity is recovered in the preservative 

 period than in the fore period and a slightly less quantity in the after 

 period than in the preservative period. The nitrogen balance is 



