1349 
but the connection becomes clearer on somewhat closer examination. 
Thus in Fig. 12 with reference to the unary system three 
more metastable equilibria occur besides the stable equilibrium 
of Sy, + Ga and the transition equilibrium of S‘,,-+-$",,, viz. the 
metastable equilibria G', + Lo, G'u + So, and Li, + Sn, 
At a temperature above the stable triple point D, coming from 
lower pressure, as Fig. 13 shows very clearly, we meet in the unary 
system first the stable unary vapour point (G, + Tu), then the 
metastable unary sublimation point for Sy,, viz. (Gy + S,,), then 
