ly the apparatus as designed should furnish most satisfactory
results.

In testing the apparatus by the electrical-check method, it has been
found to be extremely accurate. When the test has been made with burning
alcohol, as described beyond, it has been found that the large amount of
moisture apparently retained by the white enamel paint on the walls
vitiates the determination of water for several hours after the
experiment begins, and only after several hours of continuous
ventilating is the moisture content of the air brought down to a low
enough point to establish equilibrium between the moisture condensed on
the surface and the moisture in the air and thus have the measured
amount of moisture in the sulphuric acid vessels equal the amount of
moisture formed by the burning of alcohol. Hence in practically all of
the alcohol-check experiments, especially of short duration, with this
calorimeter, the values for water are invariably somewhat too high. A
comparison of the alcohol-check experiments made with the bed and chair
calorimeters gives an interesting light upon the power of paint to
absorb moisture and emphasizes again the necessity of avoiding the use
of material of a hygroscopic nature in the interior of an apparatus in
which accurate moisture determinations from the body are to be made.

The details of the bed calorimeter are better shown in fig. 4. The
opening at the front is here removed and the wooden track upon which the
frame, supporting the cot, slides is clearly shown. The tension
equalizer (see page 71) partly distended is shown connected to the
ingoing air-pipe, and on the top of the calorimeter connected to the
tension equalizer is a Sonden manometer. On the floor at the right is
seen the resistance coil used for electrical tests (see page 50). A
number of connections inside the chamber at the left are made with
electric wires or with rubber tubing. Of the five connections appearing
through the opening, reading from left to right, we have, first, the
rubber connection with the pneumograph, then the tubing for connection
with the stethoscope, then the electric-resistance thermometer, the
telephone, and finally a push button for bell call. The connections for
the pneumograph and stethoscope are made with the instruments outside on
the table at the left of the bed calorimeter.

MEASUREMENTS OF BODY-TEMPERATURE.

While it is possible to control arbitrarily the temperature of the
calorimeter by in