INGESTION OF CARBOHYDRATES. 



179 



of noting the increment above the basal value but simply to obtain the 

 general trend of the metabolism from period to period for comparison 

 with the direct measurements of the heat production. Aside from the 

 first period, in which the computed heat is 16 calories higher than the 

 determined, all the values found by direct calorimetry are higher 

 than those computed. The average for the entire experiment shows a 

 discrepancy between the values obtained by the two methods of 

 approximately 6 per cent. While this discrepancy appears very large 

 in the light of the recent exact work of Du Bois, it should be remem- 

 bered that this particular calorimeter had a very large volume and 

 was primarily designed for 24-hour experiments. The lack of agree- 

 ment between the direct and indirect calorimetry in these short 

 periods is, therefore, not so incongruous as at first sight appears. 



It should be noted that for computing the increment in the heat 

 production by the indirect method the basal value computed by indirect 

 calorimetry (152 calories) was used in place of the basal value of 164 

 calories given at the head of table 101, which was obtained by direct 

 calorimetry. The non-protein respiratory quotients are not here 

 tabulated, but have all been computed and used in obtaining the heat 

 production by the indirect method. In general they are two to three 

 points higher than the respiratory quotients recorded, as is the case in 

 practically all of the experiments in this report. 



TABLE 101. A. H. M., April 1, 1907. Sitting. (2-hour periods.) 



Sucrose: 1 



Amount, 191 grams; energy, 756 cals. ; from carbohydrates, 100 p. ct. 

 Basal lalues (March 6 and 9, 1907): COz, 51 grams; Oa, 46 grams; heat, 164 cals. 



1 Subject took sugar, together with 119 grams water, in 25 minutes. 

 2 Sample included amount for about an hour preceding the taking of sugar. 



.4. W. W., May 28, 1907. A much smaller amount of sugar (80 

 grams, with an energy value of 317 calories) was taken in this experi- 

 ment as compared with that eaten in the preceding experiment. The 

 periods were but an hour in length instead of 2 hours, as in the experi- 

 ment with A. H. M. ; the wisdom of attempting to shorten the measure- 

 ments of the metabolism to 1 hour is, however, questionable. The 



