( 465 ) 



of the fourth liydrate at the side of the solutions richer in HBr — 

 in no case, therefore, on the ice line. 



Let us furtiier consider the case wliere liquid and vapour become 

 equal at a maximum pressure. Here, this point will lie generally on 

 the side of the most volatile component and as the compound becomes 

 more dissociated and the difference in volatility of its components 

 greater, the chances are that the compositiou of liquid and vapour 

 at which they become equal, differs more from the compound. 



p 



Flo. 6 



From this originates a form of the three-phase line which is in 

 general indicated hy Fig. 6. The point H is now shifted to the top 

 branch at the left side of the maximum T in branch 1. The part 

 HC now exhibits the character of branch 3. The line HM, which 

 indicates the maximum pressures of the series of liquids and vapours 

 having an equal composition, is tangent in H to the three-phase line 

 and forms the extreme limitation of the equilibria between Ii(juid 

 and vapour. The three-phase lines for solid A and solid B both 

 exhibit the character of branch 1. 



Owing to the non-coincidence of the points H and T a similar 

 correction must be applied to the />, -i'-projectio]i of the two-phase 

 strip given by Dr. Smits as has been done by me in Fig. 5 in the 

 case of the minimum. 



The type fig. 6 will, presumably, not frequently occur, as a 

 combination between two bodies is as a rule accompanied by a 

 reduction in pressure and therefore, the occurrence of a uiaxiuuim 



