84^ 



liquidcurve of which is indicated by ed, may be imagined arisen in 

 C. Also two or more of these regions can be formed in different 

 points of the triangle and the}' can later disappear and come together 

 in different ways. 



We may now distinguish several principal cases, according to the 

 appearances in the binary systems BC and BA. 



I. Neither in the binary system BC nor in the binary system BA 

 the equilibrium liquid — gas shows a point of maximum- or of 

 minimumpressure. 



II. In the binary system BC or in the binary system AB or in 

 both these systems the equilibrium licpiid — gas shows a point of 

 maximum- or minimum pressure. We only consider the first case, 

 so that a region LG intersects only once as well the side BC as 

 the side BA. We may distinguish the following cases : 



V. on decrease of pressure or increase of T the region Z-ór shifts 

 with its liqwidline ahead along CB from C to B, and along AB 

 from A to B. 



2". On decrease of pressure or increase of T the region LG shifts 

 with its liquidcurve ahead along BC from B to C, and along BA 

 from B to A. Consequently the movement is opposite to that sub 1°. 

 3". On decrease of pressure or increase of T the region LG shifts 

 with its liquidcurve ahead firstly along CB from C to B, and after 

 this along BA from B to A or reversally from A along B to C. 

 -jj In tiie case mentioned sub 1". 



it is to be imagined e.g., that the 

 gasregion arises on decrease of 

 pressure in C (tig. J), expands 

 then across the triangle, and attains 

 at last the point B. The one 

 extremity of the region LG shifts 

 then on decrease of pressure with 

 its liquid line ahead from CtoB, 

 J A the other firstly from C to A and 

 ^ ^1 ^ -^ subsequently from A to B. This 



^^a- ^- case may also be imagined when 



the gasregion arises in A or in a point of CA or anywhere within 

 the triangle. This case may yet also be imagined, when different 

 gas regions arise, e.g. in A and C, which coincide afterwards. 



In the case sub 2° it is to be imagined, that the gasregion arises 

 in B on decrease of pressure ; fg (fig. 1) may then represent the 



