( 771 ) 
of yellow HgJ 2> because the yellow phase is always deposited from 
the vapour. 
If we now consider the question whether the literature mentions 
results in support of this theory, the answer is affirmative. These 
are chiefly the results obtained in the investigation of sulphur 1 ) and 
that of phosphorus s ). 
In the system sulphur we have two different crystalline modifica¬ 
tions, and besides them a third modification Sp, which has not yet 
been obtained in crystalline form. 
Considered in the light of this theory we must therefore assume 
three different kinds of molecules, and sulphur being known as a 
substance which is very slow, we can assume with great probability 
that sulphur is not pseudo-binary, but pseudo-ternary, i.e. will behave 
as a ternary system. 
This, however, be only remarked in passing, as these considera¬ 
tions are of no further importance for what follows. 
If we now direct our attention to the T,x -figure of the system Sp 
and rhombic sulphur Sjt (Fig. 5), it is noteworthy that by extra¬ 
polation 110°,6 has been found for the unary melting-point, and 
112°,8 for the melting-point of pure rhombic sulphur. 
It further appeared, however, that when from rhombic S was started 
from, where the equilibrium had set in at 9(T, a melting-point was 
found at 110 °. 9 , the melting-point amounting to 111°.4 when the inner 
equilibrium had set in at ± 65°. 
These are results which support the theory given here, for they 
point to the fact that we have to do here with a curve SS 1 for the 
solid inner equilibrium, which runs to the left with rise of tempe¬ 
rature. For this curve shows that as we, working quickly, start from 
an inner equilibrium established at lower temperature, this phase 
will begin to melt at a higher temperature, which was also observed 
here. 
The curve for the inner liquid equilibrium, too, runs to the left, 
so that the two curves of equilibrium have the same direction. 
Though the sulphur can furnish further proofs, we now proceed 
to the phosphorus. . . . _ 
As Cohen and Olie already mentioned, investigations of Troost 
and Hautefeuille, Lemoine, Hittorf, and themselves point to the 
i) Krcyt, Z. f. phys. Chem. 64, 518 (1908). 
3) Cohen and Oue, Chem. weekblad 6, 821 (1909). 
