1396 
formed, when it is situated between #, and /’,, only the second 
equilibrium can be formed. 
We shall represent in the following way the conversions, which 
may occur in a binary system. 
Metast. (F)= F, + F, + F, > Stab. a + F, 
5 (F)=F+F,4+F,- „ EE, or +f, 
(F,) = FP, + F, -+ F, A: a = io ais + F, 
(Fj=F, +f +7, … EE 
We see that the metastable equilibria (/’,) and (/’,) can result to 
»” 
EE) 
the same equilibria at their transition into a stable condition. This 
is always the case, when the metastable parts of the curves, which 
represent those monovariant equilibria, are situated in the same 
space of the P,7-diagram. 
Let us now take a ternary system, of which the concentration- 
and the P,7-diagram are represented by figs. 5 (II) and 6 (IL). [We 
have to bear in mind that the figures 4 (1) and 6 (II) have to be 
changed mutually |. Now we find for the conversions of the meta- 
stable monovariant equilibria into stable ones: 
Metast. (1 21+3+4-+ 5—Stab. 125 
5 (2 +3+4+5—S5tab. 125 
6 (3 +2+4+5—Stab, 128, 135 or 2 
+ 
2 235 
7 (4 2+3+5—Stab. 124, 145 or 245 
En (5 2434 Stab. 125, 
which is in accordance with the former rules. 
Hence it is apparent that each of the equilibria (1), (2) and (5), 
whatever may be its composition, is converted into 125; with the 
equilibria (8) and (4), however, it depends still on the composition, 
which of the trivariant equilibria shall occur. When the point X 
which indicates the composition of the equilibrium (8) is situated 
e.g. on the line 14 [fig. 5 (I])| then 123 is formed ; when this point X 
is situated, e.g. on the line 45, then, dependent on the position of 
X on this line, either 123 or 235 will be formed. 
When the point X happens to be situated on the line 23, then none 
of the equilibria 123, 185 or 235 can be formed, but the trivariant 
equilibrium 23 is formed. Consequently the three phases 1, 4 and 5 
disappear from the equilibrium (8) = 1 + 2 +4 + 5, while 3 occurs 
as new phase. 
When the complex A should happen to have such a composition, 
that is was represented by point 3, then the equilibrium (3) = 1 
+ 2+4-+ 5 would pass into the phase 3 only. 
When the complex X should happen to have such a composition, 
