SALICYLIC ACID AND SALIC YLATES. 583 



have been tabulated in such a way as to determine the effect, if any, 

 of the added preservative upon the metabolic activities. 



By reason of the imperfections' of the data of Nos. 3, 9, and 10 it 

 has not been possible to consider the results obtained on these men in 

 the general discussion. In order, however, that none of the data 

 obtained may escape record, the analytical results have been tabulated 

 and appear in the regular order for these three men. It is not likely 

 in any case that, starting out with twelve men it will be possible to 

 complete a study of this kind without the loss of some of the data. 

 The figures for the three men which are excluded, had they been 

 included in the general discussion, would not have changed to any 

 appreciable extent the general results. 



This general statement is made to cover all of the data recorded 

 here for the study of the metabolic processes. The data collected 

 relating to nitrogen, phosphoric acid, and sulphur are by far the most 

 important as respects metabolic activities. In addition thereto, the 

 balances and other data for fat, calories, and total solids have been 

 appended. These are of less value, but probably will help to throw 

 some light upon the general course of the investigation. 



NITROGEN BALANCE. 



INDIVIDUAL DATA. 



The nitrogen balances are given in Table XIII (pp. 592 to 604) by 

 periods and subperiods instead of by da} r s, as in the case of the borax 

 experiment. The same system having been followed as before, the 

 repetition of the detail seemed cumbersome and unnecessary. Each 

 subperiod covers five days, the exact dates being given in Table I 

 (p. 481). The amount of nitrogen ingested, the amounts excreted in the 

 feces and the urine, and the total amount excreted are expressed both 

 in grams and in percentage, the balance being given in grams. For 

 example, during the first subperiod of the fore period, extending over 

 five days, the total nitrogen exhibited in the food of No. 1 is 71.56 grams, 

 an average of 14. 31 grams per day. The total nitrogen excreted in the 

 feces covering this period is 3.76 grams, an average of 0.75 gram per 

 day. The total nitrogen excreted in the urine during this period is 59. 83 

 grams, an average of 11. 97 grams per day. The total nitrogen excreted 

 during the period in the feces and urine is' 63. 59 grams, an average of 

 12.72 grams per day. The total balance for the subperiod is 7.97 

 grams, an average of 1.59 "grams per day. The total percentage of 

 nitrogen excreted in the feces is 5.25 and in the urine 83.61, and the 

 total percentage of nitrogen excreted in both is 88.86. The totals and 

 averages for each period and subperiod are presented in the same 

 way. This explanation will sufficiently illustrate the principle on 

 which the tables are constructed. 



