606 INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



During the preservative period the total quantity of phosphoric acid 

 administered to No. 2 is 132.4:27 grams, equivalent to 4.414 grams 

 per day. Of this amount 37.553 grams appear in the feces, equiva- 

 lent to 1.252 grams per day, and 91.662 grams appear in the urine, 

 equivalent to 3.055 grams per day. The percentage of phosphoric 

 acid eliminated in the feces is 28.36 and in the urine 69.22. This 

 shows a slightly positive phosphoric acid balance, the magnitude of 

 which is 0.107 gram. 



During the after period 43.577 grams of phosphoric acid were con- 

 sumed by No. 2, equivalent to 4.358 grams per day. Of this quantity 

 12.264 grams appear in the feces, equivalent to 1.226 grams per day, 

 and 29.061 grams in the urine, equivalent to 2.906 grams per day. 

 The percentage of phosphoric acid excreted in the feces is 28.14 and 

 in the urine 66.69. This indicates a positive phosphoric-acid balance 

 of an average daily magnitude of 0.225 grams. In this case we have 

 practically a reversal of the conditions which obtained in the case of 

 No. 1. The excess of phosphoric acid which was excreted during the 

 fore period disappeared and the total amount excreted decreased con- 

 siderably, both in the preservative and after periods. 



Considering the non metabolized phosphoric acid, it is seen that the 

 amount excreted during the preservative period decreased very decid- 

 edly (4.43 per cent) and during the after period very slightly (0.22 per 

 cent), while in the case of the metabolized phosphoric acid the reverse 

 is true; that is, the smaller decrease took place in the preservative 

 period (1.22 per cent) and a very decided decrease in the after period 

 (2.53 per cent). This results, as already stated, in a marked decrease 

 in the total quantity of phosphoric acid excreted during the preserva- 

 tive period, although the amount given in the food was slightly greater 

 in the preservative period than in the fore period. In this instance 

 the exhibition of the salicjdic acid seems to exert a marked inhibitive 

 influence upon the excretion of phosphoric acid (5.66 per cent) and 

 this effect continues after the withdrawal of the preservative, the after 

 period showing a decrease as compared with the preservative period 

 of 2.74 per cent. 



The average daily quantity of phosphoric acid in the food of No. 3 

 during the fore period (only five days) is 3.773 grams, of which 0.746 

 gram was excreted in the feces and 2.14 grams in the urine. The per- 

 centage of phosphoric acid excreted in the feces is 19.79 and in the 

 urine 56.73. The average daily quantity of phosphoric acid in the 

 food for the preservative period (five subperiods) is 3.827 grams, of 

 which 0.783 gram appeared in the feces and 2.038 grams in the urine. 

 The percentage appearing in the feces is 20.47 and in the urine 53.26. 

 The balance is strongly positive, amounting to 1.006 grams per day in 

 magnitude. During the after period the average daily quantity of 



