969 
$ 14. Oxygen. The susceptibility of liquid oxygen has been deter- 
mined by KaAMERLINGH ONNEs and Perrier by two methods. It has 
now also been investigated by the attraction method in about the 
same way as the susceptibility of liquid hydrogen in Comm, N°, 122a. 
An evacuated cylindrical glass tube was hung in the magnetic field 
and then the repulsion measured that the tube underwent when the 
surrounding space was filled with liquid oxygen. The value found 
at T — 90°. 1K. agrees well with that in Comm. N°. 116; the 
small difference at the other temperatures is explained by the fact 
that the temperatures could not be very accurately ascertained. 
In the following table the values found stand beside those of 
KAMERLINGH QONNES and Perrmr according to their formula 
C1 = 2284 10-%. 
The question naturally arises whether the behaviour of liquid 
oxygen can also be represented by the formula C’=y(T + A’). If 
we assume that A’ = 71° this comes out pretty well, as appears from 
Table XI in which the values of y are taken from KAMERLINGH 
Onnes and Perrier Comm. N° 116, Table III. 
TABLE X. 
Liquid oxygen. 
1.108 x:108 | 
T | | 
_K.O. and O. (K.O.and P.) 
7 k ei NE 
90.1 K 241.1 240.6 
79.1 258. 1 256.8 
70.2 21017 212,6 
When the atoms are assumed to be free in the molecule C? 
gives for the number of magnetons 11 per atom (calculated 11.04), 
TABLE XI. 
| Representation of the susceptibility of | 
liquid oxygen by the formula 
LEL ae) Cy AC Ie: 
Tied 108 - Px (P71) 106 
90°.1 K. 240.6 38760 
71.35 269.9 38420 
64.9 284.2 38620 | 
