106 STORRS AGRICULTURAL EXPERIMENT STATION. 

THE RESPIRATION CALORIMETER AND METHODS OF 
EXPERIMENT. 
The apparatus includes a copper walled chamber about seven 
feet long, four feet wide, and six and one-half feet high, in 
which the man who serves as subject of the experiment lives 
during a period of four to twelve days and nights. An opening 
in the front of the apparatus, which is sealed during an experi- 
ment, serves as both door and window, and admits ample light 
for reading or writing. A smaller opening in the rear of the 
apparatus, called the food aperture, having tightly-fitting caps 
on both ends, is used for passing food, drink, excreta, and 
other materials into and out of the chamber. ‘There is a tele- 
phone by which the subject may communicate with those out- 
side. The chamber is furnished with a chair, table, and bed, 
each of which may be folded up and set aside when not in use. 
A stationary bicycle is also supplied when the subject is to do 
muscular work during the experiment. Airis kept in circu- 
lation through the chamber at the rate of not far from two and 
one-half cubic feet a minute. Thus, while the dimensions of 
the chamber are rather small, the subject finds nothing par- 
ticularly disagreeable or uncomfortable in his sojourn within 
it, save for the restricted space and the monotony of the pre- 
scribed daily routine. But so little are these felt that each of 
the five men who have thus far sojourned in the calorimeter 
has found it a very tolerable place of residence and has been 
perfectly willing to repeat the experience. It may, therefore, 
be considered that the conditions are not sufficiently abnormal 
to affect the results of the experiments. This is an important 
consideration. . 
The circulation of air is effected by a special pump, which 
measures the volume of the ventilating current and at regular 
intervals draws measured samples of the outgoing air for analy- 
sis. At the same time samples of the incoming air are also | 
taken for analysis. From these determinations the amounts of 
respiratory products—carbon dioxid and water—given off by 
the subject may be computed. 
Heat is constantly given off within the chamber by the man’s 
body, whether he is at work or at rest. When he is at rest, 

z. €., doing no external muscular work, there is neverthelessa __ 
