( 2d52-) 
segments of a sphere. The expansion of the glass was corrected for 
from the data of Comm. N°. 956. The positions of the liquid in the 
dilatometer stem must be corrected for the liquid in the ring-shaped 
meniscus that rises up against the glass; to determine this correction 
we first got the height by an estimation with the micrometer eyepiece 
or by a measurement made with the micrometer wire of that eye 
piece; it is very difficult, however, to fix the base of the meniscus. 
In the end we used the results obtained by graphical calculation of 
the meniscus from the laws of capillarity *). 
Finally, to determine the quantity of gas given off by the liquid 
whose corrected volume we have just found from the mass of the 
gas in the dilatometer up to the tap #,, we must make allowance 
for the mass of gas in the dead spaces of the narrow capillary, of 
the small portion dys, and of the steel capillary d, that connects the 
glass capillary with the tap 4, 
The temperatures of the various parts of the narrow glass capillary 
depend upon the level of the liquid in the bath. Taking this into 
account they were taken from isotherm measurements, particularly 
from those given in Comm. N°. 97a. 
The pressures used in the, various experiments were always those 
of the saturated vapour; for the greater part of the measurements 
they were found in the manner indicated in $ 4. For temperatures 
at which the density of the saturated vapour is sufficiently small to 
be calculated, vapour pressures were found by interpolation from 
the measurements just mentioned and from the earlier determinations 
of Comm. N°. 107a. 
Seeing that oxygen isotherms have not yet been determined for 
low temperatures the densities in the various parts of the dead space 
were obtained by calculation, starting from the mean reduced equation 
of state VII, 1 (Suppl. N°. 19, pp. 17 and 18) given by equation III 
of Comm. N°. 74 by omitting the terms succeeding © and taking 
account of note 1, Comm. N°. 97a p. 24. . 
In this we put 
UE 118°.8, DE 50.8 
Bs 1 Ga 1 
T=t4-273,09 B= En, Cm Ep — 
pats ig bomen age 
Ay = ve (Ba -1C4s 29) 
in, which Ay’, By,..-. are the values of Ay, Ba... att O22 
1) Mr. pre Haas, was kind enough to undertake this calculation for which we 
wish to record our thanks to him. 
