CHEMICAL THEORY OF SOLUTIONS. PART I. 



33 



studied by the authors men- 

 tioned above. The form of 

 the curve has been discussed 

 by VAN Laar in detail. On 

 the otlier hand graphical re- 

 presentations of the general 

 features of the fusion curves 

 and surfaces may be of some 

 interest although they do not 

 bring out anything new. 



Fig. 9, A rejjresents the S= 

 fusion surface of a component 

 in a ternary system, while 

 Fig. 9, B and C represent 

 the fusion surfaces of a binary 

 and a ternary compound. 



J 6. 



§ 4. The Equilibrium between an Ideal Liquid and 

 an Ideal Solid Solution. 



It is probable that, in some cases, at least, conditions (1) 

 and (2) are satisfied by solid solutions. For example, Ketger 

 observed in several cases of isomorphous mixtures, that the 

 volume was equal to the sum of the volumes of their components. 

 And if these conditions are fulfilled, we may apply equation (3) 

 in the discussion of equilibria into which such solid solutions 

 enter. In the present section the equilibrium between an ideal 

 solid and an ideal liquid solution will be considered. As the 

 solid phase is supposed by the very conditions not to contain 

 any compound, the problem is so far simplified. The equilibrium 



