SULPHUKOUS ACID AND SULPHITES. 915 



The data for No. 6 show a somewhat increased elimination of phos- 

 phoric acid. This was due entirely to the increased amount in the 

 feces, for the amount eliminated in the urine was considerably less in 

 the preservative period than in the fore period. The influence of the 

 preservative appears, therefore, to have been to decrease the absorp- 

 tion of phosphoric acid. In the after period there is a tendency shown 

 to return to the conditions of the fore period. 



The data for No. 7 are complete only for the fore and preservative 

 periods. The quantity of phosphoric acid excreted in the fore period 

 is considerably larger than in the preservative period. There appears 

 to be a tendency in this case to diminish not only the quantity, but the 

 percentage of phosphoric acid excreted and thus to increase the posi- 

 tive balance. It should be noted in this connection that a smaller 

 amount was ingested in the preservative period. 



The data for No. 8 are complete for the three periods. The quan- 

 tity of phosphoric acid exhibited in the food is fairly constant. There 

 is an increased excre'tion of phosphoric acid in the feces during the 

 preservative period and a marked decrease in the after period. The 

 quantity of phosphoric acid appearing in the urine for the three 

 periods is almost identical. 



Notwithstanding the fact that the total amount of phosphoric acid 

 excreted was increased during the preservative period, the amount 

 excreted in the urine was considerably decreased. The amount 

 excreted in the feces was largely increased. These conditions point 

 to a marked tendency on the part of the preservative to decrease the 

 absorption of the phosphorus. In the after period there is a marked 

 tendency to return to the conditions of the fore period. The balance 

 in the fore period is 0.124, in the preservative period 0, and in the after 

 period 0.432. 



The quantity of phosphoric acid ingested in the food of No. 9 is 

 almost the same in all three of the periods. There is a slight increase 

 in the excretion of phosphoric acid in the feces during the preserva- 

 tive period, and this is still more marked in the after period. There 

 is also a marked increase in the excretion of phosphoric acid in the 

 urine in the preservative period, and this increase is maintained, 

 though not quite to the same degree in the after period. There is a 

 notable increase in the total amount of phosphoric acid excreted dur- 

 ing the preservative period, and a further increase during the after 

 period. The balance during the fore period is 0.683, during the pre- 

 servative period 0.305 gram, and during the after period 0.055 gram. 

 The effect of the preservative in this case appears very strongly 

 marked in increasing the metabolism of phosphorus, and this increased 

 activity is manifested in the highest degree during the fore part of the 

 after period. In marked contrast to the greater part of the data 



11240 Bull. 84, pt 307 11 



