sorbed
from the air-sample, (_b_) being ultimately the logarithm of the volume
of carbon dioxide.

In order to determine the total volume of air in the chamber under
standard conditions of temperature and pressure, to the logarithm of
volume I-III is added, first, a logarithmic factor for the temperature
recorded for the calorimeter to correct the volume of air to standard
temperature. As the temperature fluctuations are all within 1 degree, a
table has been prepared giving the standard fluctuation represented by
the formula

1
-----
1 + _at_

in which _t_ is the temperature of the calorimeter. The correction for
pressure has also been worked out in a series of tables and the
logarithmic factor here corresponds to the ratio _p_/760, in which _p_
is the observed barometer. The logarithm of the total volume is recorded
as a result of the addition of these three logarithms enumerated, and
from this logarithm is expressed the total volume of air in liters.
Deducting the sum of the values (_a_) and (_b_) from the total volume
leaves the volume of oxygen plus nitrogen.

The calculation of the residual volume of nitrogen and the record of the
additions thereto was formerly carried out with a refinement that to-day
seems wholly unwarranted when other factors influencing this value are
taken into consideration. For the majority of experiments the residual
volume of nitrogen may be considered as constant in spite of the fact
that some nitrogen is regularly admitted with the oxygen. The
significance of this assumption is best seen after a consideration of
the method of calculating the amount of oxygen admitted to the chamber.

RESIDUAL SHEET No. 1.

Calculation of residual amounts of nitrogen, oxygen, carbon dioxide and
water-vapor remaining in chamber at 8.10 A. M., June 24, 1909.

Residual at end of Prelim. period. Exp.: Parturition. No.........
Subject: Mrs. Whelan. Calorimeter: Bed.

-------------------------------------------+-------------------------------
Barometer, 756.95 mm. | Miscellaneous Calculations
Temp. cal., 20.08 deg.C | 875 48.65
-------------------------------------------+ 164.55 25.9
| ------ 90.
Apparent Volume of Air | 710.46 ------
| 4