801 



I will therefore first devote a few moments to the discussion of 

 the derivation of these rules. 



If the concentrations of the coexisting phases in a system of an 

 arbitrary number of components have been given, there exist in the 

 P, T'-figure definite relations for the relative situation of the lines 

 for monovariant equilibria. For quadruple points Dr. Scheffkr has 

 derived a rule which indicates this relation, and which renders the 

 construction of the three phase lines possible, if the succession in 

 concentration of tlie four phases is known. ^) Afterwards the same 

 rule derived and formulated in a slightly different way, was 

 given by Schreinkmakers. ') Tiie situation of the four phase lines 

 round a quintuple point has already been described b}' Schreinkmakers 

 in "Heterogene Gleichgewichte III 1", the relations holding for them 

 have been lately elucidated further by him. ') 



Fig. 8. 



For the construction of Ihe subjoined P,T-t\gures I have used 

 these relations availing myself of tiie following figures, which 



1) These Proc. XV, p. 389. Z. f. phys. Ghem 84. 707 (1913). 



2) Z. f phys. Ghem. 82, 59 (1913). 



») Verslag Kon. Akademie 25 Nov. 1915. (Not yet translated,) 



