iment. Usually several bottles of drinking-water are deposited in
the calorimeter in a convenient position, as well as some urine bottles,
reading matter, clinical thermometer, note-book, etc. Before the cover
is finally put in place, the pneumograph is tested, stethoscope
connections are tested to see if the pulse can be heard, the rectal
thermometer connections are tested, and the telephone, call-bell, and
electric light are all put in good working order. When the subject has
been weighed in the chair, the balance is tested to see that it swings
freely and has the maximum sensibility. All the adjustments are so made
that only the minimum exertion will be necessary on the part of the
subject after the experiment has once began.

SEALING IN THE COVER.

The cover is put in place and wax is well crowded in between it and the
rim of the opening. The wax is preferably prepared in long rolls about
the size of a lead-pencil and 25 to 30 centimeters long. This is crowded
into place, a flat knife being used if necessary. An ordinary
soldering-iron, which has previously been moderately heated in a gas
flame, is then used to melt the wax into place. This process must be
carried out with the utmost care and caution, as the slightest pinhole
through the wax will vitiate the results. The sealing is examined
carefully with an electric light and preferably by two persons
independently. After the sealing is assured, the plugs connecting the
thermal junctions and heating wires of the cover with those of the
remainder of the chamber are connected, the water-pipe is put in place,
and the unions well screwed together. After seeing that the electrical
connections can not in any way become short-circuited on either the
metal chamber or metal pipes, the asbestos cover is put in place.

ROUTINE AT OBSERVER'S TABLE.

Some time before the man enters the chamber, an electric lamp of from 16
to 24 candle-power (depending upon the size of the subject) is placed
inside of the chamber as a substitute for the man, and the cooling
water-current is started and the whole apparatus is adjusted to bring
away the heat prior to the entrance of the man. The rate of flow with
the chair calorimeter is not far from 350 cubic centimeters per minute
with a resting man. The proper mixture of cold and warm water is made,
so that the electric reheater can be controlled readily by the
resistance in series with it. Care is taken not to allow the water to
enter