115 



vations can be represented with sufficient aecnracy by tlie eqnations 

 (1) and (4). This is confirmed b}- Table II which gi\es the values of 

 X calculated with the aid of the mean values of 6^ given in table I. 

 Table II also contains the deviations O C between observed and 

 calculated values. 



Table II confirms the conchision tliat the observations concerning 

 the specific susceplibilit}- of (»xygen in tiie liquid mixtures of nitrogen 

 and oxygen can be repi-esented within the degree of accuracy of 

 those observations by substituting the expression kl^ in Lancjevin's 

 theory by an expression for the molecular rotatoi'y energy which is 

 derived from the quantum-theory with the assumption of a zero- 

 point energy ^). 



These observations do not therefore furnish a decision between the 

 assumption just mentioned and that, in which the expression kT in 

 Langevin's theory is left unchanged, but the assumption of a negative 

 molecular field is added, which was found by Perrier and Kameklingh 

 Onnes (Comm. N". 139(/) to be in sufficient agreement with the 

 observations. In the mean time it must be mentioned that on the 

 assumptioji investigated in this paper the inclination of the x ^ T- 

 lines for the mixtures with small density of the oxygen approaches 

 to the equipartition value for oxygen, which follows from the measure- 



1) Dr. OosTERHUis tells me, thai calculations made in the way indicated above, 

 but in wiiicli for ih- the expression is taken which was assumed by him in Suppl. 

 N" 31, lead to the same result Cf. note 2 p. 1)15, Comm. N", 139(7 



