BORIC ACID AND BORAX. 



259 



five days; No. 5, six days; No. 6, six days in all thirty-five days. By referring to 

 the total, it was seen that the nitrogen in the food consumed during the same time 

 that is, the figure in brackets amounted to 600.350 grams. This divided by 35 gives 

 17.15 grams, or the average number of grams of nitrogen consumed by each person 

 for each day on which the feces were collected and analyzed. 



Applying the same principle to urine, the number of days on which the urine was 

 saved in the fore period of the first series was: No. 1, five days; No. 2, five days; 

 No. 3, six days; No. 4, six days; No. 5, six days; No. 6, six days, making in all 

 thirty-four days. The number of grams of nitrogen consumed during the .same time 

 amounted to 583.941 (the figure given in parentheses). This divided by 34 gives 

 17.17 grams as the average amount of nitrogen consumed by each man for each day 

 on which the urine was collected and analyzed. 



In column 2 the numbers given for each man represent the nitrogen eliminated 

 for all days on which the feces were analyzed, while the total and average are obtained 

 just as in column 1, using the same number of days used in obtaining the bracketed 

 average in the food column. Similarly, in column 3, the individual data represent 

 all days on which the urine was analyzed, and the average is obtained by using the 

 number of days used in obtaining the average in parentheses in the food column. 

 The same principle applies to column 4, where the average is obtained in the same 

 manner as the uninclosed average in column 1. In the percentage and balance 

 columns the total and average results are obtained as indicated in the heading, using 

 in each case the numbers on the same line in the corresponding columns. 



This same principle applies to the statements regarding nitrogen, phosphoric acid, 

 fat, calories, and solids for all experiments conducted. The same method of record- 

 ing, collecting, and averaging was employed in all periods. 



Now, still further to simplify the data and reduce not merely the results of one 

 series to a single statement, but to reduce all the series to the same basis, tables com- 

 bining the various summaries for the several series have been prepared. As an 

 illustration of this, Table LV, on page 306, general summary of nitrogen balances, is 

 cited. During the fore period of Series I, 566.765 grams of nitrogen were consumed 

 on the days when the feces and urine were collected and analyzed, 600.350 grams 

 were consumed on all days for which feces were collected and analyzed, and 583.941 

 grams of nitrogen were consumed on the days on which urine was collected and 

 analyzed. During the fore periods of all series, 1,937.485 grams of nitrogen were 

 consumed during the days on which both feces and urine were collected and 

 analyzed. The corresponding number of days for all fore periods, obtained as 

 indicated above, was 111. Dividing 1,937.485 by 111 gives 17.455 as the average 

 number of grams of nitrogen consumed by each man during the fore periods of 

 all series for each day on which both feces and urine were collected and analyzed. 

 The corresponding results for all days on which feces were examined and for all days 

 on which urine was examined are obtained in the same manner, using for the former 

 the figures in brackets and for the latter the figures in parentheses. 



It is to be noted that in the general summaries Series II has been omitted from 

 the averages owing to the fact that all of the men were ill at the close of the preserv- 

 ative period and no after period was run. It was not desired to compare the averages 

 of the fore periods and preservative periods of five series with the after periods of 

 four series, and for that reason the results on Series II are omitted in the averages. 

 . At the same time the figures are given for the sake of comparison. 



