144 
INCOME AND OUTGO OF ENERGY. 
Perhaps the most interesting results of these experiments, both 
because of their novelty and because of their bearing upon the metab- 
olism and the conservation of energy in the living organism, are those 
which compare the amounts of potential energy in the materials actually 
oxidized in the body with the amounts of kinetic energy given off from 
the body, either as heat alone in the rest experiments or as heat and 
external muscular work in the work experiments. In the rest experi- 
ments there was no considerable amount of external muscular work. , 
The little that was done would naturally be converted into heat — as. for 
instance, in the impact of the foot upon the floor in stepping, or of the 
body upon the chair or bed in sitting or lying down. The heat thus 
imparted to the floor, chair, or bed would naturally find its way to the 
absorbers, and would thus be carried out with the heat given off as 
such by the body. Roughly speaking, we may say that all the poten- 
tial energy made kinetic in the body by the oxidation of food and body 
material left the body as heat. This is shown by the agreement of the 
amount of heat given off from the body with the heat of oxidation of 
the material oxidized in the body. These data are summarized in 
Table 151. 
Table 151. — Comparison of income and outgo of energy in 19 experiments covering 65 
expt rimental days — Amounts per day. 
Subjects and kinds of experiments. 
Xet income 
berof ^P° tentia ! 
expert energy ot 
- material 
oxidized 
in body). 
Xum- 
mental 
days. 
Net outgo 
(kinetic en- 
ergy given 
off from 
bodvi. 
Difference i in terms 
of net incomei. 
REST EXPERIMENTS. 
Experiments with E. O.: 
Experiment in which the net outgo falls 
farthest below the net income (Xo. 5): 
average for the whole experiment 
Experiment in which the net outgo is far- 
thest above the net income (Xo. 14 i: aver- 
age for the whole experiment 
Average for 9 experiments 
Experiments with A. W. S. : Average for 1 experi- 
ment 
Experiments with J. F. 8.: Average for 3 experi- 
ments 
Experiments with E. O.. A. W. S.. and J. F. 8.: 
Average for 13 experiments 
WORK EXPERIMENTS. 
Experiments with E.O.: Average for 2 experi- 
ments 
Experiments with J. F. 8.: Average for 4 experi- 
ments 
Experiments with E. O. and J. F. 8. : Average for 
6 experiments 
Rest and work experiments: Average for 
19 experiments 
Calories. 
2,482 
2, 131 
2,288 
2.304 
2. 118 
2,255 
3,865 
3, 539 
3,669 
2, mo 
Calories. 
2. 379 
Calories. 
-103 
2. 193 
2, 278 
- 10 
2, 279 
- 25 
2. 136 
- 1- 
2. 2.50 
3,540 
3, 656 
2,682 
- 36 
- 1 
- 13 
- 8 
-4.1 
.4 
■1.1 
• .8 
.2 

- .4 
- .3 
