369 
the righthand side, but on the lefthand side, in which case fig. 9 
gives one of the possible situations. The region of incomplete misci- 
bility lies too high here to give the second lower metastable unary 
point of solidification. 
All these 7,7-figures can be accurately determined by means of 
the $-z-lines, which has been omitted here for want of space. 
It may finally be remarked that the phenomenon of enantiotropy 
for liquids has never been observed as yet, but the possibility of 
this phenomenon is beyond all doubt. 
Anorg. chem. laboratory of the University. 
Amsterdam, Sept. 20, 1912. 
Chemistry. — “The application of the theory of allotropy to the 
system sulphur’. Il. By Prof. A. Smits. (Communicated by 
Prof. A. F. HorLEMAN). 
\ 
In a preceding communication ') I already pointed out that the 
theory of allotropy requires that the system sulphur must be consi- 
dered to be at least pseudo-ternary. 
On that occasion a 7,z-figure was projected by me, which as I 
stated already then, had still to undergo a simplification by the 
omission of the region of incomplete miscibility 7). But the figure 
had to be modified also in another respect, for in the meantime 
SMITH and Carson *) had determined the melting-point line of a third 
crystallised moditication of the sulphur, the so-called soufre nacré 
(mother-of-pearl sulphur), which had been discovered by GERN&Ez *). 
To keep the representation as simple as possible for the present, 
the modification required to insert this third crystallised condition of 
sulphur into our figure, has been accomplished by assuming in the 
pseudo binary system Sp— Sy and Sy—S,°) above the eutectic point 
a discontinuity in the monoclinic mixed crystals. In consequence of this 
the line for the internal liquid equilibrium in the plane for the pseudo- 
binary system Sr— Sj meets the stable melting-point line of one kind 
of monoclinic mixed crystals in /,, and the metastable branch of the 
melting-point line of the other kind of monoclinic mixed crystals in 
/,, the same line of equilibrium cutting the metastable part of the 
1) These Proc. XIV 263. 
Pina » „AIV 461. 
3) Zeitschr. f. phys. Chem. 77, 661 (1912). 
4) Journ. de phys. 3, 76 (1884). 
5) By Sr, Sar, Su the pseudocomponents are meant here. 
