588 INFLUENCE OF FOOD PEESEKVATIVES ON HEALTH. 



in addition to that weighed out at the experimental table. The data 

 in these cases are therefore discredited, and the balances are printed 

 merely to show the reason for their exclusion from the summaries and 

 the conclusions. 



No. 11. 



The quantity of nitrogen in the food during the fore period extend- 

 ing from October 19 to October 28 is 177.42 grams, equivalent to 17.74 

 grams per day. Of this amount 9.01 per cent is excreted in the feces 

 and 89.35 per cent in the urine. This shows a slightly positive nitro- 

 gen balance equivalent to 0.29 gram per day. 



The quantity of nitrogen in the food administered to No. 11 during 

 the preservative period is 528. 34 grams, equivalent to 17.61 grams per 

 day. Of this quantity 8.74 per cent is excreted in the feces and 85.15 

 per cent in the urine. The nitrogen balance is positive for the pre- 

 servative period and amounts to 1.07 grams per day. During the 

 after period the quantity of nitrogen in the food of No. 11 is 177.67 

 grams, equivalent to 17.77 grams per day. Of this quantity 7.66 per 

 cent is excreted in the feces and 76.64 per cent in the urine. The bal- 

 ance is positive and very high, amounting to 2.79 grams per day. 

 The excretion of both metabolized and nonmetabolized nitrogen is 

 decreased in the preservative period, and this decrease is still greater 

 in the after period. 



No. 12. 



The quantity of nitrogen in the food of No. 12 during the fore 

 period is 175.18 grams, equivalent to 17.52 grams daily. Of this 

 amount 8.25 per cent is excreted in the feces and 84.89 per cent in the 

 urine. The nitrogen balance is positive and amounts to 1.20 grams 

 per day. During the preservative period the quantity of nitrogen in 

 the food of No. 12 is 514.30 grams, equivalent to 17.14 grams per day. 

 Of this quantity 5.88 per cent is excreted in the feces and 84.53 per 

 cent in the urine. The nitrogen balance is again positive in the pre- 

 servative period and 'has increased to 1.64 grams per day. The quan- 

 tity of nitrogen in the food of No. 12 during the after period is 170.46 

 grams, equivalent to 17.05 grams per day. Of this quantity 6.48 per 

 cent is excreted in the feces and 88.27 per cent in the urine. The 

 nitrogen balance is still positive, but has decreased to 0. 90 gram per day. 



The principal effect of the preservative in this case is to slightly 

 inhibit the excretion of nitrogen. The inhibition is found almost 

 exclusively in the nonmetabolized material, the percentage of nitrogen 

 in the food which was excreted in the feces falling from 8.25 in the 

 fore period to 5.88 in the preservative period and rising again to 6.48 

 in the after period. 



