BOKIC ACID AND BORAX. 



15 



six men, and Series II and IV with the other set. Three divisions 

 were made of each series of observations, namely, "fore period," 

 " preservative period," and "after period." The time assigned to 

 each of these periods varied, and the total time of the three periods 

 varied from thirty to seventy days. The preservative period was 

 divided into subperiods, differing in the amounts of the preservative 

 used. The time covered by the various series, periods, and subperiods 

 is shown in the following table: 



TABLE I. Divisions of the series, showing dates of periods and subperiods. 



a For the study of body weights the fore period of Series I began December 8. 



ft Only two members of the class went through the fourth subperiod of Series II, and because of 

 insufficient data this subperiod is omitted from averages. 



cAs planned, Series II was to have an after period, but because of illness of all members of the 

 class there was none. 







The object of the "fore period" was to determine as nearly as pos- 

 sible the quantity of food required to maintain the body weight at 

 nearly a constant figure and to determine the normal metabolism as a 

 basis of comparison with that of the preservative period. Preceding 

 the fore period the quantities of food freely chosen by each individual 

 were noted so that some idea might be formed of the proper amount 

 to be weighed or measured. If it was evident that too much food had 



