608 INFLUENCE OF FOOD PKESEKVATIVES ON HEALTH. 



28.11 and 60.63 per cent, respectively. The balance is positive and of 

 an average daily magnitude of 0.488 gram. During the after period 

 No. 5 consumed in his food 4.225 grams of phosphoric acid, of which 

 1.156 grams appear in the feces and 2.462 grams in the urine, equiva- 

 lent to 27.35 and 58.28 per cent, respectively. The balance is positive 

 and has attained during the after period an average daily magnitude 

 of 0.607. 



A comparison of the average data by periods shows the effect of the 

 preservative in increasing the digestion and the absorption of phos- 

 phoric acid from the intestinal canal and in producing a very slight 

 additional excretion of metabolized phosphoric acid. This effect is 

 continued in the after period in so far as the continued absorption of 

 phosphoric acid from the intestinal canal is concerned, but the meta- 

 bolized phosphoric acid is diminished, thus considerably increasing 

 the daily balance. 



No. 6. 



The total quantity of phosphoric acid contained in the food con- 

 sumed by No. 6 during the fore period represents an average daily 

 quantity of 3.599 grams. Of this amount 1.316 grams appear in the 

 feces and 1.982 grams in the urine, corresponding to 36.56 and 55.09 

 per cent, respectively. The balance is positive and has an average 

 daily magnitude of 0.301 gram. During the preservative period the 

 average quantity of phosphoric acid exhibited in the food daily is 

 3.808 grams. The quantity appearing in the feces is 1.334 grams and 

 in the urine 2.252 grams, equivalent to 35.03 and 59.14 per cent, 

 respectively. The balance is still positive, though the daily magni- 

 tude thereof is not so great as during the fore period, having been 

 reduced to 0.222 gram. In the after period the average quantity of 

 phosphoric acid consumed daily by No. 6 is 3.713 grams, of which 

 1.422 grams appear in the feces and 1.989 grams in the urine, corre- 

 sponding to 38.30 and 53.56 per cent, respectively. The balance is 

 again positive and is almost exactly the same in magnitude as in the 

 fore period, namely, 0.302 gram daily. There is a tendency shown by 

 these data on the part of the preservative to increase the quantity of 

 metabolized phosphoric acid excreted and at the same time to dimin- 

 ish the quantity of the nonmetabolized phosphoric acid. By reason 

 of the greater excretion of phosphoric acid in the urine during the 

 preservative period the total magnitude of the positive balance is 

 reduced by about one-third. 



Upon the withdrawal of the preservative the percentage of non- 

 metabolized phosphoric acid excreted increases 3.27 per cent, exceeding 

 that of the fore period, while the quantity of metabolized phosphoric 

 acid falls 5.58 per cent, reaching a figure considerably below that of 

 the fore period. The data therefore in this case indicate that the pres- 



