118 STORRS AGRICULTURAL EXPERIMENT STATION. 
A. W. S. there was a slightly larger amount of carbon dioxid 
eliminated in the first two than in the third period, the rates 
being 39.8, 37.1, and 32.8 grams, respectively. In the four 
experiments with J. F. S. the elimination during the first three 
periods averaged 37.0, 36.1, and 31.6 grams per hour, respect- 
ively. During the second night period, when the subject was 
generally asleep for nearly the whole time, the output fell off 
with E. O. to 22.4, with A. W. S. to 23.2 and with J. F. S. to 
22.3 grams per hour. Not only are the averages with the 
three men in close accord, but the range of variation in the 
different days and experiments is decidedly narrow for all. In 
the average of the eleven experiments the proportion given off 
in each of the four periods of the day is 28.7, 28.1, 26.2, and 
17.0 per cent., respectively. 
The elimination of carbon dioxid in the two day periods of 
the work experiments was more than twice as large as in the 
two day periods of the rest experiments. With EH. O. the 
average amounts given off were 78.4 grams in the first and 
79.5 in the second day period when at work as compared with 
38.3 and 37.8 grams, respectively, when at rest. With J. F.S. 
the amounts averaged 73.6 and 74.7 grams in the day periods 
of the work experiments as compared with 37.0 and 36.1 grams 
in the corresponding periods of the rest experiments. The 
elimination in the two night periods averaged with E. O. 38.4 
and 23.1 grams in the work experiments as compared with 36.1 
and 22.4 grams in the rest experiments, the differences being 
small; with J. F. S. the amounts were practically identical, 
being 31.3 and 22.3 grams in the work experiments as com- 
pared with 31.6 and 22.3 grams in the rest experiments. 
The uniformity in the amounts of carbon dioxid given off dur- 
ing the second night period in all the experiments is very no- 
ticeable. Such data may perhaps be taken as an approximate 
measure of the metabolism of carbon in the body of an active © 
healthy man when at its lowest ordinary ebb. 7 
ELIMINATION OF ENERGY. 
Measurements of energy.—The kinetic energy given off by 
the body is measured in these experiments as the sum of three 
quantities: (1) The heat taken up by the water current in 
its passage thrqugh the chamber; (2) the latent heat of the 
