56 
Table 61 shows the amount of heat carried away in the water cur- 
rent and in the water vapor in successive 0-hour periods. 
Table 61. — Summary of calorirnetric measurements — Metabolism experiment Xo. 21. 
(a) 
(6) 
(c) 
(<*) 
W ater va- 
porized 
(/) 
(</) 
Date. 
Period. 
Heat 
measure 
in terms 
of C 20 . 
Change 
of tem- 
perature 
of calo- 
rimeter. 
Capacity 
correc- 
tion of 
calorim- 
eter, 
6x60. 
Correc- 
tion due 
to tem- 
perature 
of food 
and 
dishes. 
equals 
total 
amount 
exhaled 
less 
amount 
con- 
densed in 
chamber. 
Heat 
used in 
vaporiza- 
tion of 
water. 
ex 0.592. 
Total 
heat de- 
termined, 
a-\-c+ 
d+f. 
1899. 
Calories. 
Degree. 
Calories. 
Calories. 
Grams. 
( 'alorii s. 
Calories. 
Feb. 12-13 
7 a. 
m. to 1 p 
m.. 
531.5 
+0. 02 
+1.2 
+12.7 
210.2 
124.4 
669. 8 
IP 
m. to 7 p 
m.. 
495. 2 
- .02 
-1.2 
+ 9.7 
211.4 
125. 2 
628. 9 
7p 
m. to 1 a. 
m.. 
427. 3 
+ .01 
+ .6 
208.8 
123. 6 
la. 
7 a. 
lp. 
m. to 7 a. 
Total... 
m. to 1 p. 
rn. to 7 p. 
m.. 
m.. 
264.8 
- .03 
-1.8 
190.9 
113.0 
376.0 
1,718.8 
- .02 
-1.2 
+22.4 
821.3 
486. 2 
2. 226. 2 
13-11 
534.9 
473. 2 
+ 8.8 
+ 8.1 
219.0 
214.4 
129. 7 
126.9 
673. 4 
+ .02 
-1.2 
609. 4 
7 p. 
m. to 1 a. 
m.. 
427. 7 
- .01 
- .6 
22 s. 2 
135. 1 
562. 2 
1 a. 
7 a. 
m. to 7 a. 
Total... 
m. to 1 p. 
m.. 
.... 
m.. 
301.6 
- .03 
-1.8 
198.8 
117.7 
417.5 
1,737.4 
- .02 
-1.2 
+ 16.9 
860.4 
509. 4 
2,262.5 
14-15 
583.4 
- .03 
-1.8 
+ 4.7 
223. 8 
132.5 
718.8 
lp. 
m. to 7 p. 
m.. 
493.7 
+ .06 
+3.6 
+ 9.1 
227. 6 
134.7 
641.1 
7 P- 
m. to 1 a. 
m... 
426. 7 
- .01 
- .6 
236.0 
139. 7 
565. B 
la. 
m. to 7 a.m.. 
Total 
Total, 3 days. 
297.7 
+ .01 
+ .6 
209.2 
123. 9 
422.2 
1,801.5 
4- .03 
+1.8 
+13.8 
896.6 
530. 8 
2. 347. 9 
5,257.7 
- .6 
+53.1 
2, 578. 3 
1.526.4 
6, 836. 6 
Balance of income and outgo of matter and energy. — The income 
and outgo of nitrogen, carbon, hydrogen, and energy are shown in 
Tables 62-65. 
In earlier experiments it was assumed that body fat contained 76.5 
per cent carbon and 12 per cent hydrogen, with a heat of combustion 
of 9.5 calories per gram. Late determinations of the composition and 
heat of combustion of body fat by Benedict and Osterberg a essentially 
confirm these factors, showing 76.1 per cent carbon. 11.8 per cent 
hydrogen, and 9.54 calories per gram. These latter factors have been 
used in the computations of results of all experiments including and 
subsequent to No. 21. This change in factor, however, makes ex- 
tremely little difference in the final results, so that it has not been 
thought best to recalculate those for experiments preceding Xo. 21 
according to the new factors. 
Amer. Jour. Physiol., 4 (1900), p. 74. 
