1402 
KAMERLINGH ONNES was also led to assume a similar increase of the 
attraction with the temperature, to explain peculiarities in liquid 
helium, and Kersom in discussing the second virial coefficient of 
helium at higher temperatures, found that peculiarities of this coeffi- 
0,650 -1 
(x50 (150 0,850 9,550 0250 0,950-1 
150 
