ned for this room a temporary
wooden floor was laid, thus furnishing the greatest freedom in placing
piping and electric wiring beneath the floor. As fast as the
calorimeters are completed, permanent flooring with suitably covered
trenches for pipes is to be laid. The room is amply lighted during the
day, the windows being very high, with glass transoms above. At night a
large mercury-vapor lamp in the center of the room, supplemented by a
number of well-placed incandescent electric lights, gives ample
illumination.

GENERAL PLAN OF CALORIMETER LABORATORY.

The general plan of the laboratory and the distribution of the
calorimeters and accessory apparatus are shown in fig. 1. The double
doors lead from the main hall into the room. In general, it is planned
to conduct all the chemical and physical observations as near the center
of the laboratory as possible, hence space has been reserved for
apparatus through the center of the room from south to north. The
calorimeters are on either side. In this way there is the greatest
economy of space and the most advantageous arrangement of apparatus.

At present two calorimeters are completed, one under construction, and
two others are planned. The proposed calorimeters are to be placed in
the spaces inclosed by dotted lines. Of the calorimeters that are
completed, the so-called chair calorimeter, which was the first built,
is in the middle of the west side of the room, and immediately to the
north of it is the bed calorimeter, already tested and in actual use. On
the east side of the room it is intended to place large calorimeters,
one for continuous experiments extending over several days and the other
large enough to take in several individuals at once and to have
installed apparatus and working machinery requiring larger space than
that furnished by any of the other calorimeters. Near the chair
calorimeter a special calorimeter with treadmill is shortly to be built.

The heat insulation of the room is shown by the double windows and the
heavy construction of the doors other than the double doors. On entering
the room, the two calorimeters are on the left, and, as arranged at
present, both calorimeters are controlled from the one platform, on
which, is placed the observer's table, with electrical connections and
the Wheatstone bridges for temperature measurements; above and behind
the observer's table are the galvanometer and its hood. At the left of
the observer's platfo