OF THE SYSTEM NAPHTHALENE-PHENOL. 



Putting these values in (10) und (11) 







2{A+m) 



Hence the equation (2) can be written 



In this way the dissociation constant Ë, can be evaluated from 

 experimental data. It has been found to decrease raj)idly with 

 a falling temj^erature. The relation between the dissociation 

 constant deduced in this way and the temperature can be re- 

 presented tolerably well by an equation of the form 



^^^R\% TJ (3-) 



in which the constants D and X are to be determined empirically. 

 When the values of D and X thus empirically found are 

 inserted in (7), the equation was found to express the fusion 

 curve of naphthalene w^ith tolerably close approximation as will 

 be shown in § 4. 



3. The Fusion Curve of Phenol. 



As phenol consists essentially of two chemical species, it is 

 necessary to determine to which of them the solid phase stands 

 in immediate relationship. At the melting point of pure phenol, 

 (CgHcO)3 preponderates greatly over CgHgO ; hence it will be 

 more natural to suppose that in the action of melting and 

 solidifying the transformation takes place between the solid phase 



