SULPHUROUS ACID AND SULPHITES. 917 



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SUMMARIES. 



The summary for Nos. 1 to 6 covers the entire experiment, with the 

 exception of the fourth subperiod of the preservative period. This 

 summary shows that the average quantity of phosphoric acid given 

 is almost identical in each period, amounting to 4.478 grams in the fore 

 period, 4.386 grams in the preservative period, and 4.394 grams in 

 the after period. The quantity of phosphoric acid excreted in the 

 feces is notably increased during the preservative period, rising from 

 1.340 grams in the fore period to 1.594 grams in the preservative 

 period, and decreasing in the after period to an amount slightly less 

 than that in the fore period, namely, 1.314 grams. In the urine 

 there is a slight decrease in the amount of phosphoric acid excreted, 

 falling from 2.688 grams daily in the fore period to 2.580 grams daily 

 in the preservative period, and 2.531 grams daily in the after period. 

 Taking the total excretion of phosphorus in the feces and the urine, we 

 find that the daily average quantity in the fore period is 4.029 grams, 

 in the preservative period 4.174 grams, and in the after period 3.845 

 grams. These data show a slight increase in phosphoric acid elimi- 

 nated in the feces, a slight decrease in the urine, and a slight increase 

 in the total elimination. The balance in the fore period is 0.449 

 gram, in the preservative period 0.212 gram, and in the after period 

 0.549 gram. 



These figures show quite a distinct effect of the preservative to 

 increase the excretion of phosphoric acid, while the data for the feces 

 and urine indicate that this effect is produced by reason of the greater 

 excretion of nonmetabolized phosphoric acid. 



The summaries for Nos. 8, 9, 10, and 11 are complete for all the 

 periods. The quantity of phosphoric acid in the food is almost con- 

 stant during the three periods. The quantity of phosphoric acid 

 excreted in the feces is notably greater, both in the preservative and 

 in the after period, than in the fore period. The quantity excreted 

 in the urine is slightly less both in the preservative period and in 

 the after period. The total quantity excreted is notably greater both 

 in the preservative and after periods. The balance for the fore 

 period is 0.591 gram, for the preservative period 0.435 gram, and 

 for the after period 0.549 gram. The general effect of the preserva- 

 tive, therefore, is to increase the excretion of total phosphoric acid, 

 notwithstanding the decrease in metabolized phosphorus eliminated, 

 and thus to diminish the positive balance. 



In the summaries for Nos. 1 to 6 it is seen that the phosphoric 

 in the feces is markedly increased during the preservative period, 

 >eing 36.34 per cent of the amount ingested in the food as com- 

 >ared with 29.93 per cent, which is the percentage amount elimin- 

 ated in the feces in the fore period. 



