38 AET. ]l\ H. HIROBE : ON THE FDSIOX SURFACES OF THE 



'~V 2(1 + 3«) V 4(1 



-C^)V+ (l±«}i^ 



(l + 3«j V 4(1 + 3«/ 27 (1 + 3 «f 



^8l (1-c'.,) ., / ^(i-^^)^^ ., ^a+«)^ 



V 2(1 + 3«) ^ 4(1 + 3«/ 27(1 + 3«/ 

 But as 



^. ^ Ça = Ç-^ 



C'^ + t'^+Ci + 3c, 1 + 2 C3' 



if we substitute for il and Ca iii these equations the functions 

 of temperature given above we get the expression for the fusion 

 surface of naphthalene : 



B \ 1' T J 



4(l + 3«/~ 27(1 + «)•' 



+ 



V 2(1 + 3«) V 4(1 + 3«/ 27(1 + 3«/ 



In the above expression Q is not a constant factor, and as we 

 could not ßnd any rational expression for it, we have traced 

 graphically the relation between the temperature and the values 

 of Q, and obtained the value of Q for given temperatures by 

 interpolation. To compare the values of x calculated from the 

 above equation with those experimentally obtained, we selected 

 the fusion curve No. 5 and the isothermal curve at the tem- 

 perature 51.04°, because they lie at about the middle of the 

 fusion surface. 



