( 44 ) 



The subjoined table combines the calculated values. We call 

 attention to the fact that the minimum in the neighbourhood of C 

 can only belong to the branch G'„G'„ for type 1 {6 ^> the double 

 point value), and never to the branch C. t C x for type II or III 

 {8 <^ the double point value). For 7' 2 ^> 7', being put, the minimum 

 on C\C\ cannot possibly lie at C„ but it can lie in the neighbourhood 

 of C\. 



That is to say: for a gas vtithout cohesion as one of the components 

 of the mixture (a, = 0, x = oo) X would have to be larger than the 

 limiting value go, for a minimum to appear in the line C, C„ in the 

 neighbourhood of C % . (Then t °!t 3 <C 1 would be at the same time). 

 For finite values of I this cannot be satisfied, and the line C C, 

 proceeds with T > T % without a minimum. 



For a gas with feeble cohesion, where e.g. x= / — = 16, 



/I = — must be ^> l s /u> for a minimum to appear. t «/t 3 is then <[ 1,19. 

 6, 



For He— H a — is about 175, hence' x = 13,2 according to an 



estimation of Keesom (These Proc, March 28, 1907, p. 661 ; Ibid. 

 April 25, 1907, p. 794). To this corresponds according to formula (c) the 

 limiting value ;. = 1,29. Now Keesom estimated (loc. cit.) this value 

 at about 2 for He — H 2 , and 2 being > 1,29, there is a minimum 

 in the plaitpoint line in the case of He — H s . This minimum can be 

 fully calculated by the aid of the formulae (2) to (8). The value of 

 t «/t 3 is then smaller than about 1,25. 



