BOEIC ACIC AND BORAX. 249 



elimination of fat in the feces during the administration of the preserv- 

 ative, and a tendency to recover is shown during the after periods. 

 The percentage of fat ingested in the food eliminated during the fore 

 periods is 4.1, during the preservative periods 4, and during the after 

 periods 4.2. These data show that almost no disturbance in the metab- 

 olism of fat is caused by the administration of the preservative. 



INFLUENCE OF BORIC ACID AND BORAX UPON THE OXIDATION OF THE 

 COMBUSTIBLE MATTER IN THE FOOD. 



The collected data of all the series, except Series II, show that 6.4 

 per cent of the combustible matter in the food is eliminated, unburned, 

 during the fore periods, 6.6 per cent during the preservative periods, 

 and 7 per cent during the after periods. These data show a slight 

 tendency on the part of the preservative to interfere with the com- 

 bustion of the food in the body, and this tendency is continued in even 

 a more marked manner during the after periods. 



INFLUENCE OF THE PRESERVATIVE UPON THE SOLIDS EXCRETED. 



The solids summary for all of the series, except Series II, shows 

 that the average quantity of solids in the food during the fore periods 

 is 631.5 grams, during the preservative periods 627.6 grams, and dur- 

 ing the after periods 614.1 grains. The average daily quantity of 

 solids appearing in the feces in the fore periods is 25.6 grams, in the 

 preservative periods 28.6 grains, and in the after periods 28.3 grams. 

 The average quantity appearing in the urine during the fore periods 

 is 64.48 grams, during the preservative periods 59.37 grams, and in 

 the after periods 56.20 grams. The average balance of total solids 

 during the fore periods is 544.701 grams, during the preservative 

 periods 539.875 grams, and during the after periods 530.123 grams. 

 These data show a slight tendency on the part of the preservative to 

 increase the total solids excreted in the feces and to decrease the total 

 solids excreted by the urine. There is a distinct tendency manifested 

 by the preservative to interfere with the processes of digestion and 

 absorption. Inasmuch, however, as the total quantity of solids admin- 

 istered in the food varied slightly in the different periods, a fairer 

 interpretation is obtained by comparing the percentages of the total 

 solids exhibited in the food eliminated by the feces and urine, respec- 

 tively. In this comparison it is found that the total percentage of 

 solids in the food eliminated in the feces during the fore periods is 4.1, 

 during the preservative periods 4.6, and during the after periods 

 4.6. The percentage of solids in the food eliminated in the urine dur- 

 ing the fore periods is 10.2, during the preservative periods 9.5, and 

 during the after periods 9.1. These percentages indicate also very 

 strongly the influence exerted by the preservative mentioned above. 



