590 



INFLUENCE OF FOOD PEESEKVATIVES ON HEALTH. 



activities. The most plausible cause of a large negative balance, when 

 the normal quantity of food is consumed and the energy is constant, is 

 an increase of the katabolic activities of the body. 



SUMMARY. 



In all of the summaries the totals and averages for the nine subjects 

 completing the series satisfactorily are combined in one expression 

 for each subperiod and for the fore, preservative, and after periods 

 as a whole. Thus in the fore period the data are totaled and averaged 

 for all subjects for each of the two subperiods and then for the entire 

 period. In the following discussion only the data for the entire 

 periods will be considered, and these are here inserted in tabular form 

 for convenience in reference: 



TABLE XII. Nitrogen summary, by periods, for nine men, Series VI. 



The average quantity of nitrogen consumed by each of the nine men 

 daily during the fore period is 15.46 grams, of which 1.29 grams are 

 excreted in the feces and 13.50 in the urine. Expressed as percentages, 

 8.33 per cent of the total nitrogen is excreted in the feces and 87.32 

 per cent in the urine. The average daily balance is 0.67 gram. 



For the whole preservative period the average daily quantity of 

 nitrogen ingested is 15.37 grams, of which 1.15 grams is excreted in 

 the feces and 13.51 grams in the urine. Expressed in percentages, 7.50 

 per cent of the total nitrogen is excreted in the feces and 87.89 per 

 cent in the urine. The average daily balance of the nitrogen is 0.71 

 gram. For the entire after period the average quantity of nitrogen 

 exhibited in foods is 15.46 grams, of which 1.21 grams is excreted in 

 the feces and 13.56 grams in the urine. Expressed in percentages, 

 7.83 per cent is found in the feces and 87.75 per cent in the urine. 

 The average daily balance of the nitrogen is 0.69 gram. 



A comparison of these data by periods shows that the average daily 

 amount of nitrogen in the food during the preservative period is 

 slightly less than in the fore and after periods, where they are the 

 same. The quantity execreted in the feces is considerably diminished 

 during the preservative period, in fact by a larger quantity than could 

 be accounted for by the slight diminution of the amount ingested. 

 The quantity excreted in the urine is a trifle greater than in the fore 

 period, although the total amount in the food is less. That is, the 

 percentage figures show a diminished quantity of nonmetabolized 



