628 INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



fore and after periods. In this case also we find a greater amount 

 of sulphur excreted than is found in the food, but the effect of the 

 preservative seems to have been to diminish this excessive amount. 



The average daily quantities of sulphur administered in the food of 

 No. 3 for the three periods are 0.916 gram, 0.968 gram, and 0.954 

 gram, respectively. Only the second subperiod of the after period is 

 considered, the first subperiod being broken by illness of the subject. 

 Of this quantity there appear daily in the feces for the three periods 

 0.104 gram, 0.122 gram, and 0.103 gram, respectively, and in the 

 urine 0.825 gram, 0.734 gram, and 0.803 gram, respectively. 

 Expressed in percentage of the total quantity of sulphur in the food 

 there appear in the feces for the three periods 11.38, 12.61, and 10.84 

 pei- cent, respectively, and in the urine 90.13 per cent, 75.88 per cent, 

 and 84.13 percent, respectively. The balance is slightly negative in 

 the fore period, strongly positive in the preservative period, and 

 very slightly positive in the after period. The effect of the preserva- 

 tive in this case seems to have been to decrease the excretion of metab- 

 olized sulphur. More nonmetabolized sulphur is excreted during the 

 preservative period than in either of the other periods, but the quan- 

 tity of metabolized sulphur excreted is very much less in the preserv- 

 ative period than in either of the other periods. The fact that the 

 preservative period was a period of convalescence for this subject 

 probably partly explains the variations in balances, and on account of 

 the illness of No. 3 the data have no comparative value. 



No. 4. 



The quantities of sulphur contained in the food of No. 4 for the 

 three periods of observation are 0.989 gram, 1.020 grams, and 0.998 

 gram, respectively. Of this quantity there appears in the feces for 

 the three periods 0.113 gram, 0.117 gram, and 0.117 gram, respect- 

 ively, and in the urine 0.948 gram, 0.911 gram, and 0.959 gram, 

 respectively. Expressed as percentages, of the total quantity of sul- 

 phur in the food, it appears that for the three periods 11.37 per cent, 

 11.47 per cent, and 11.70 per cent, respectively, are excreted in the 

 feces, and 95.82 per cent, 89.35 per cent, and 96.03 per cent, respect- 

 ively, in the urine. The balance is negative throughout, but is very 

 small, especially in the preservative period, being represented by the 

 quantity 0.071, 0.008, and 0.077 gram, respectively, for the three 

 periods. We have in this instance a slight tendency on the part of 

 the preservative to increase the excretion of nonmetabolized sulphur 

 and to diminish the excretion of metabolized sulphur. 



