
ETO STORRS AGRICULTURAL EXPERIMENT STATION. 
The excess of vapor in the air that leaves the chamber over 
that in the air that enters it represents water which has been 
given off as vapor from the body of the subject, and has re- 
quired heat to vaporize it. The amount of heat thus carried 
out of the chamber is computed from the amount of water vapor 
and the temperature at which it leaves the chamber. 
The larger part of the heat generated within the chamber is 
absorbed and carried out by the current of cold water, above 
referred to as flowing through a copper pipe around the interior 
of the chamber. The cooling surface of the pipe is increased 
by thin disks of copper fastened at close intervals along the 
coil. The water enters the chamber at a low temperature, 
passes through the copper coil, absorbs heat from the chamber 
and passes out ata higher temperature. The quantity of water 
that passes through the coil, and the difference between the 
temperatures at which it enters and leaves the coil, are carefully 
determined, and show how much heat was thus brought out of 
the chamber. Adding the heat brought out by the water vapor 
in the ventilating air current to the heat brought out by the 
water current we have the whole heat produced in the chamber. 
This is the measure of the kinetic energy which resulted from 
the oxidation of food and body material in the man’s body. In 
other words, it is the energy which he transformed; or to use 
another expression, it is the measure of the. metabolism of 
energy in his body. ‘ | 
So delicate are the measurements of temperature of the air 
within the chamber, and of the metal walls, that the observer 
sitting outside the apparatus and noting the changes every two 
or four minutes, immediately detects a rise or fall of even one 
one-hundredth of a degree. For instance, if the man inside 
rises to move about, the increase in the heat given off from his 
body with the muscular work involved shows itself in a rise of 
temperature, which the observer immediately detects. 
To complete the records made by the observers, the subject 
himself keeps a diary in which he records periodical observa- 
tions of his weight, pulse-rate and axillary or sub-lingual tem- 
perature, together with any statements which may be of service — 
in interpreting the results of the experiments. 

