469 
In the quaternary system occur solutions saturated with one, two 
and three solid substances. 
Those saturated with one solid substance only are represented by 
a plane, the saturation plane of that substance. 
Plane I or abhg is the saturation plane of the CuCl, .2H,0. 
”» II » € d Bj ” »” » EE) EE) ” K Cl. 
Ped | ee ee see = io ee Ba, Cle AERON 
EE) IV EE) Tg hi ” ” EE) ” DE) EE) Di 22. 
The intersecting lines of these saturation planes indicate the solu- 
tions saturated with two solid substances; thus we find: 
Curve bh is the saturation curve of CuCl,.2H,O+BaCl,.2H,0. 
- Chie a 5 ns … 9 KCI+BaCl,.2H,0. 
Dr ered : hye KOE Dy oo 
Dn ih ze 5: 5e ae ze Di22 +BaCl,.2H,O. 
Bp hg Ae wey 5e a nF Dy22+ CuCl, ,2H,O. 
The solutions saturated with three solid substances are represented 
by the points of intersection of the saturation planes; 
Point h is the saturation point of CuCl,.2H,O+BaCl,.2H,O+D; 29. 
KCI+BaCl,.2H,O+D, 22. 
If we remember that the equilibria represented in Fig. 1 apply 
only to one definite temperature 7’ and to one definite pressure P, 
we notice occurrence of the following equilibria: 
A. Invariant (P. 7.) equilibria (2 Components in 7 phases) 
2 t 9? > be) 9) 2) 
1. binary: the point a, ¢ and e; 
2. ternary: re Oh AR CU ORP 
3. quaternary: „5 ‚and h. 
B. Monovariant (P. 7.) equilibria (2 Components in 2—1 phases) 
1. ternary: the Curves ab, be, ed, de, ef, fy and ga. 
2. quaternary: the Curves bh, hi, id, if and gh. 
C. Divariant (P. 7) equilibria (2 Components in n—2 phases. 
1. quaternary: the planes EPR ALM andl ¥: 
The equilibria occurring at 60° are represented schematically in 
fic. 2; this is distinguished from fig. 1 in so far that between 
the saturation plane / and /V of fig. 1 another saturation plane V 
has introduced itself so that the following saturation planes occur. 
Plane /, or ablk, the saturation plane of CuCl, 2H,0 
EE) LL »» € d vf EE) EE) EE) EE) KCI 
LAER GED BNR 4 its | Ci aid 
EE) vi a EE) tg h i, EE) ” EE > Di 22 
” a » J hik ” ” ” EE) Di: 
