820 
on the one side of the (J/)-curve the curve (VD), then (C) and (42 
must be situated on the other side. Now it follows further from (9) 
that (C) and (/) must be situated within the angle which is formed 
by the metastable parts of the curves (D) and (M. Now it appears 
from (8) or (10) that those curves (C) and (/) must be situated, as 
is drawn in fig. 6. 
d) The five pbases form a type of concentration-diagram as in fig. 7. 
From the position of the phases with respect to one another follows: 
CAV CBR CED | CO) a NS Ai coe 
(A) (B) (B) | (D) an PS fo A rn 
LBD Bl Chie Ga EEn 
Because, as it appears from 141) a and (13) the singular curves 
(A) and (B) are situated on the same side of each of the three curves 
(C‚ (D) and (F), the (M)-eurve is, therefore, monodirectionable and 
the three singular curves (M), (A) and (B) coincide, therefore, in 
the same direction. Now we draw those three curves in a P,T-dia- 
gram, as in fig. 8. When we draw curve (J) at the one side of 
(M) 
Fig. 7. Fig. 8. 
the (M)-eurve, then (C) and (#) must be situated at the other side. 
It appears from (12) that (C) must be situated at the one side, and 
(A), (B) and (/) at the other side of (D); we obtain, therefore a 
type of P,7-diagram as in fig. 8. 
We are also able to find the different types of P,7-diagram by 
using the three main-types of P}7-diagrams | viz. I, IA and IIA}, 
which we have deduced in communication X. 
In main-type I curve (M) is monodirectionable, so that the three 
singular curves coincide in the same direction; the P,7-diagram of 
a system of m-components has then the same appearance as that of 
a system with n—1 components. The P,7-diagram of a ternary 
