163 
differ however on the magnitudes of the quadrupole moments’) that 
are to be ascribed to the molecules of the gases in question (hydrogen, 
oxygen and nitrogen) on account of the data of the equation of state. 
The author has deduced these quadrupole moments *) from the 
experimentally found second virial coefficients for the above mentioned 
gases at selected temperatures by comparing them with the depend- 
ency of the second virial coefficient on the temperature as deduced 
for fixed quadrupoles and thus without attending to the displacement 
of the charges mentioned under 2nd, Afterwards’) he has proved that 
at those temperatures the influence of the displacibility of the charges 
is only small compared with that of the attraction due to the fixed 
quadrupoles. From this it is evident, that the values for the quadrupole 
moments derived from the experimental data do not undergo con- 
siderable changes by the displacibility of the charges. 
Following another way of calculation however DxsisE finds con- 
siderably higher values for the quadrupole moments and on several 
grounds he prefers these higher values. | 
In this communication will be shown that the author cannot adhere 
to this opinion and by further calculation he will investigate the 
influence of the polarisability of the molecules on the value found 
for the quadrupole moment. Then, as might be expected, this influence 
will be found to be small. 
§ 2. Rectification. In the first place it may be mentioned here, that 
at the last moment a calculation error has been made in my 
former calculation of the quadrupole moment of hydrogen. From 
the values for o and v given in Leiden Suppl. N°. 39a § 5 we 
find for the quadrupole moment of the hydrogen molecule: 
oii Wor? fee. xem.) 
instead of the value that was given there‘). 
As by his calculation of the quadrupole moment of hydrogen 
Desise found the value 
u, = 2,14 x 10-6, 
1) For a molecule which is not rotationally symmetric (and which has no dipole- 
moment) this is replaced by a mean quadrupole moment, comp. DeBiJe l.c. 
2) Leiden Suppl. N°. 39a. These Proc. Vol. XVIII, p. 636. These Comm. N°. 6a, 
these Proc. Vol. XXIII NO. 6 p. 939. 
8) lc. p. 162, note 2. 
4) In note 1 p. 15 le. we must read therefore 0,70 X 10-8 instead of 
0,92 X 10-8. As to the remark in § 1 of Comm. N°, 6a, these Proce Vol. XXIII 
p. 940 on the agreement between the values of the quadrupole moment deduced 
from the equation of state and from the model of Bounr-Degise, this loses its sense. 
dln 
