140 
Table 148. — Energy given off by the body in different ways — Amounts per day. 
Subject and kind of experiment. 
Days 
covered 
by 
experi- 
ments - duction. 
Heat eliminated. 
Heat 
By radia- 
tion and 
In urine 
and 
feces. 
lungs. 
Total. 
REST EXPERIMENTS. 
£. O., 9 experiments: 
Minimum 
Maximum 
Average 
A. W. S., 1 experiment: 
Minimum 
Maximum 
Average 
J. F. S., 3 experiments: 
Minimum 
Maximum 
Average 
Average of 13 experiments. 
WORK EXPERIMENTS. 
E. O., 2 experiments: 
Minimum 
Maximum 
Average 
J. F. S., 4 experiments: 
Minimum 
Maximum 
Average 
Average of 6 experiments . 
33 
Calories. 
1,479 
1,835 
1,675 
1,710 
1,782 
1,739 
1,564 
1,759 
1,622 
12 
20 
Calories. 
19 
56 
33 
30 
34 
31 
17 
27 
23 
1,669 
2. 045 
2,521 
2, 249 
2,185 
2,400 
2,296 
2, 277 
Calories. 
412 
715 
570 
486 
531 
509 
468 
520 
491 
Calories. 
31 
550 
1,041 
1,560 
1,332 
1,240 
988 
1,126 
Calories. 
2,062 
2,452 
2, 278 
2,226 
2,348 
2. 279 
2, 065 
2, 297 
2,136 
193 
270 
228 
127 
277 
238 
234 
2, 250 
3.473 
4,287 
3,829 
3, 253 
3,890 
3, 540 
3. 656 
The figures for the heat given from the urine and feces, as shown 
in the third column in Table 148, are calculated from the weights of 
these excreta, their fall in temperature, and their specific heats. The 
weights are found by the balance. The fall in temperature is the dif- 
ference between the temperature of the body and that of the interior 
of the chamber. This difference averages about 17 degrees. The 
specific heats are arbitrarily assumed, that of feces being taken as 0.9 
and of urine 1.0. 
The figures in the fourth column represent the latent heat of vapor- 
ization of the water given off by the lungs and skin. For the rest 
experiments this water is in general that carried out of the chamber 
in the air current in excess of that brought into the chamber by the 
same current. In a few rest experiments, however, and in all the 
work experiments more or less water is condensed on the absorbers 
and is not carried out by the air current. The figures in the third 
column include the heat given off in the condensation of this water 
vapor upon the absorbers, along with the latent heat of vaporization of 
the water in the air current. The reason why little or no water was 
condensed on the surfaces of the absorbers in the rest experiments is 
