BORIC ACID AND BOB AX. 145 



to any further extent. An inspection of the data obtained in this 

 summary shows an increase in the amount of feces voided during the 

 preservative period, and a very slight increase in the content of water 

 therein, but nothing of a notable character. Of the nitrogen in the 

 food, 9.4 per cent appears in the feces during the fore period and 12.1 

 per cent in the preservative period. Of the phosphoric acid in the 

 food, 37.8 per cent appears in the feces in the fore period and 48.2 in 

 the preservative period. Of the fat in the food, 4.3 per cent appears 

 in the feces in the fore period and 5.2 in the preservative period. Of 

 the calories in the food, 4 per cent appears in the feces in the fore 

 period and 5.1 per cent in the preservative period. These data show 

 a "narked tendency on the part of the preservative to decrease the 

 absorption of the nitrogen, the phosphoric acid, the fat, and the 

 calories. 



Although the data are not complete in every instance, it is possible 

 to make a comparison during the whole period of Series IV on Nos. 

 8, 9, and 10, as indicated in the summary of the data for these three 

 subjects. In respect of the quantity of the feces voided, a considerable 

 increase is seen during the preservative period, the fore period and the 

 after period having an almost identical quantity. There is little change 

 noted in the percentage of water in the feces, there being a little less, 

 however, during the preservative period and the after period than in 

 the fore period. The quantity of nitrogen administered daily in the 

 food is slightly smaller in the preservative period than in the fore 

 period, and considerably smaller in the after period than in either. 

 The quantity of phosphoric acid administered in the food is almost 

 exactly the same in the fore period and preservative period and a little 

 less in the after period. The quantity of fat in the food consumed in 

 the fore period is somewhat greater than that consumed in the pre- 

 servative period, and the latter greater than that in the after period. 

 The calories in the food during the fore period are slightly greater 

 than in the preservative period and very decidedly greater than in the 

 after period. 



These data seem to indicate a progressive tendency on the part of 

 the preservative to lessen the appetite, and this tendency is continued 

 during the after period, which is not surprising when it is considered 

 that the whole of the after period is required to eliminate the traces 

 of the preservative from the body. In respect of the relative absorp- 

 tion of the elements of the food it is seen that, in the case of nitrogen, 

 of the total quantity in the food 7.5 per cent appears in the feces in 

 the fore period, 8.4 per cent in the preservative period, and 8 per cent 

 in the after period. Of the phosphoric acid in the food, 31.4 per cent 

 appears in the feces in the fore period, 37 per cent in the preservative 

 period, and 33.3 per cent in the after period. Of the total quantity 

 of fat in the food, 3.3 per cent appears in the feces in the fore period, 

 4242 No. 84, pt 104 10 



