SYSTEM NAPHTHALENE-CHLOROBENZENE-PHENOL, ETC. 49 



phenol and clilorobenzene mixture was employed and the water 

 absorbed was 0-962 grammes. To apply the proper correction 

 for the quantity of water absorbed is a very difficult matter. 

 On one hand water has a considerable j^ower of dissociating 

 complex molecules, as may be seen from the depression of the 

 freezing point of the aqueous solution of phenol. On the other 

 hand the degree of association of water molecule itself is not 

 known even in dilute solutions. The addition of water decreases 

 the value of C and consequently that of C'j. But since the 

 presence of water promotes the dissociation of phenol, that is 

 increases 61, the resulting effect can not l)e very large. 



In more dihite solutions the absorption of water must have 

 been much less and the effect must accordingly have been much 

 smaller. 



Summary. 



1. The fusion surfaces of nnphthalcne and phenol of the 

 system naphthalene-chlorobenzene-phenol have been determined. 



2. The eutectic line between tlie two fusion surfaces has 

 also been observed. 



3. The general forms of the fusion surfaces have been 

 found to be such as would be furnished by two unassociated 

 components and an associated one. 



4. An attempt has been made to account quantitatively for 

 the special form of the fusion surface of naphthalene by the 

 hypothesis that in the solution phenol is more or less associated 



