895 



namelj' two three-pliase lines foi- two solid phases and vapour, 

 intersect, without inverse melting taking place in the sysleni. In 

 case of inverse melting such an intersection must take place, as 



was before denjonslralec 



case of sncli an 



Fig. 10. 



intersection without inverse melting, had however not yet been 



considered, so that the system — Fe teaches us something new here. 



When we now consider the possibility of a stable intersection of 



the two tl.u-ee-phase lines for FeO + FegO, -\- G and Fe^O, -f Fe,(), -\- G 



y^+^'i''^ 



Fig. 11. 



according to the supposition in fig. 8, we get a shape for the 

 P, T-projection of the system — Fe as indicated in tig. 11. In 

 this case the three-phase line for Fe, 0^ -|- L -|- G would, therefore, 

 be raetastable. 



1) A. Smits. Zeitschr. f. Elektr. Cliem. 18, 1081 (1912). 



