170 Journal of the Mitchell Society. {Dec. 



ter neither theory is applicable.) 



With the three alcohols others have concluded that at the 

 critical temperature there is no association. With them the 

 molecular attraction, it will be recalled, changed with the 

 temperature. Using- the values of fi\ obtained nearest the 

 critical temperature, where the effect of the association could 

 be assumed nil, we obtained the last values given, which are 

 in good accord with the results given by Crompton. 



In Table 24 the critical data, except for water, are from the 

 measurements of Profs. Ramsay and Young or Dr. Young. 

 References have been given (second paper). 



There is nothing in the method adopted to prevent the 

 application of equations 20 and 21 to other points than the 

 critical temperature. Had the equations been combined, an 

 equation similar to equation 18 would have been produced, 

 and the above results may be regarded as but a special appli- 

 cation of that equation. 



EXTENSION OF THE THEORY TO THE ENERGY RELATIONS AT 

 THE CRITICAL TEMPERATURE. 



Solving equation 6 of the first paper 1 we get: 

 [22] fi = C y—T^j.- r^" = cvtfZ; 



where c is the same constant for all non-associated substances, 



L — E 



and m is the molecular weight. -tt= ' we have shown 



W d — f D 



to be a constant for any particular substance, have called this 



constant /*', and have given the average constants for the 



substances examined (Table 25). fi represents the absolute 



attraction at unit distance from a molecule and must be 



regarded as an exceedingly important and a constant property 



of the molecule. The values obtained for — are given in 

 Table 25. 



1 Jour. Phys. Ohem., 1902, 4, p. 209. 



