HTl 



Fig. 1. 



with respect to one anotlier is, however, not vet defined, we shall 

 refer to this later. 



Fnrtlier it follows from (1) a»d (2) that A' is situated at the 

 right (jf F' and E' ; oonseqnenlly A' is situated within the an^le, 

 which is formed by the stable part of curve F' and the metastable 

 part of curve E' . As however also the metastable part of curve C' 

 is situated within this angle, we have still to define the position of 

 A' with respect to this curve. For this we take the hexahedron 

 BCEFD; as the diagonal BD intersects the triangle CEF, we^mó.-. 

 C' E' F' \ A' \ B' D' (3) 



Hence it is apparent that C' , E' and F' must be situated at the 

 one side, B' and D' at the other side of A'; consequently A' must 

 be situated between the stable part of F' and the metastable part 

 of C'. 



In order to define the position of A' and C' with respect to one 

 another, we might have considered also the hexadron DCEFB. As 

 the diagonal Bl) intersects the triangle CEF, we find : 



B' D' \C' \ A' E' F' (4) 



In accordance with what has been deduced above we find here 

 that B' and D' must be situated at the one side and A'. E' and 

 F' at the other side of curve 6". 



lu order to define the position of B' and Ü' with respect to one 

 another, we have to l^now the reactions, which occur in the mono- 

 variant systems B' and D' ; we shall refer to this later. 



When we introduce, as in the case of ternary systems, the idea 



