part of the laboratory room. It is
important, however, to know the total volume of the air inclosed in the
whole system. This is obtained by direct measurement. The cubic contents
of the calorimeter has been carefully measured and computed; the volumes
of air in the pipes, valve systems, absorbing vessels, and
tension-equalizer have been computed from dimensions, and it has been
found that the total volume in the apparatus is, deducting the volume of
the permanent fixtures in the calorimeter, 1,347 liters. The
corresponding volume for the bed calorimeter is 875. These values are
altered by the subject and extra articles taken into the chamber.

From a series of careful measurements and special tests the following
apparent volumes for different parts of the system have been calculated:

Liters.
Volume of the chair calorimeter chamber (without fixtures) 1360.0
Permanent fixtures (5); chair and supports (8) 13.0
------
Apparent volume of air inside chamber 1347.0
Air in pipes, blower, and valves to surface of acid in
first acid vessel 4.5
------
Apparent volume of air containing water-vapor 1351.5
Air above surface of acid in first sulphuric-acid vessel and
potash-lime can 16.0
------
Apparent volume of air containing carbon dioxide 1367.5
Air in potash-lime can, second sulphuric-acid vessel and connections,
sodium-bicarbonate cans, and pipes to calorimeter chamber 23.5
------
Apparent volume of air containing carbon dioxide, water, oxygen,
and nitrogen 1391.0

These volumes represent conditions existing inside the chamber without
the subject, _i. e._, conditions under which an alcohol check-test would
be conducted. In an experiment with man it would be necessary to deduct
the volume of the man, books, urine bottles, and all supplemental
apparatus and accessories. Under these circumstances the apparen