( 832 ) 
would follow that for T=90°.1K. x = 374.10- 6 a number that 
differs essentially from ours l 2 ). 
There is therefore no possibility of extrapolating Curie’s law to 
the liquid phase of oxygen. This was also the conclusion reached by 
Fleming and Dewar in their first treatment of the question, but 
after more careful experiments they rejected their former result 3 ). 
The results obtained from the two magnetic rise apparatus at lower 
temperatures can, within the limits of experimental error, be expressed 
by a very simple law: the specific susceptibility is inversely propor¬ 
tional to the square root of the absolute temperature. From the 
observations obtained with the more reliable apparatus we deduce 
the formula 
Xiiq.T = 
2284 
VT' 
10 6 
which holds to within 5%. None of the results obtained bj the method 
of the maximum couple are in conflict with those deduced from the 
formula. 
The results yrith solid oxygen approximately follow the relation 
At the lowest temperatures there is a small deviation indicating 
a smaller increase at lower temperatures; it is, however, so small 
that we may still accept the formula given as approximately correct 
for the solid state of aggregation below the melting point of oxygen 
and down to 14°.2 K. 
Further experiments at more numerous temperatures must show* 
exactly how far these deductions hold for the liquid and solid states. 
They shew (see fig. 5) that there is a jump in the value of x at the 
melting point, since 
XUq.T m =1,3 Xsol.T m 
] ) R. Hennig’s (1893) result should give 
27600 
X = —19~ G and X90M K. = 307.10~6. 
2 ) Fleming and Dewar’s results: 1st paper (1896) *90°.1K.=200. 10~ 6 ; 2nd paper 
(1898) 28/ . ID- 6 , mean 248.5.10— 6 pretty much the same as our result. Accord¬ 
ing to the mean of the result of Farajdav and Becquerel the specific suscep¬ 
tibility for • oxygen at O 3 is 91.1Q- 6 ; this gives by extrapolation from Curie’s 
law *903.iK. = 299.10- 6 . The English savants used this number in their second 
research for the comparison of the susceptibility of liquid oxygen with that of 
the gas. 
