1559 
4 
an 
B in this drawing the sublimation line meets the three-phase line 
Sim + Say + G of the pseudo-binary system, which means that it 
is supposed here that a point of transition occurs here under the 
vapour pressure. Therefore besides the sublimation line Sa, + Gy 
two more lines of internal equilibrium start from this triple point in 
the unary system, viz. the sublimation line of the new modification 
AB for the coexistence S,, + Gu and the transition line BC for Sa, + Su. 
Where the metastable prolongations of the vapour tension line 
Lu + G, and of the three-phase line Seu + L + G meet, the meta- 
