114 



Xcq. 



U^ 



n' 



....... (3) 



^0.1 in mixtixre 



If for Uy we assume the temperature function, developed in Suppl. 

 N". 32rt, and determined by 







(4) 



7' 



vvhei'e 



X V"rO 



?<rO = ^ f^'^o ' 



(5) 



7' 



at each value of .i- the mutually corresponding values of — ,and-- 



T 

 can be calculated. The value of - corresponding to the value ot 



u 



UyjkT given by equation ^3) can then be found by graphical inter- 

 polation, after which 6^ immediately follows. 



From the data of Table I Comm. N". 139^/ by Pkrrikk and 

 Kamerlingh Onnes the following values of 6^ were in that way 

 obtained -. 



From the fact, that the individual values of 0^ vaiy irregularly 

 about the mean values, the conclusion may be drawn that the obser- 



