091 
Kreyr draws no region of demiscibility, but states that for the sake of 
brevity he discards the probable occurrence of the region of demiscibility. 
It’ would have been more correct to state that nothing pleads for its 
existence and that therefore it was omitted. In connection herewith I 
will observe the following. If we prolong the lines AD and BZ, 
as indicated by Kruyr (Zt. phys. Chem. 64, 513) they intersect each 
other at about 106°, so far above 96°. GHI would then lie at 106° 
which cannot be. If now we call to our aid a region of dissociation 
(see Fig. 2) this difficulty, of course, does not occur, but this alone does 
not justify the assumption of a region of demiscibility, particularly 
if we remember that the mode of representation is not correct. 
The matter may indeed be explained readily when, as required 
by Prof. Smirs’s theory, we not merely assume two kinds of sulphur 
S,; and §S,, but (at least) three kinds of molecules which we will 
indicate briefly by S,, Sy, and Sp,. Because there exists a transi- 
tion point Sy = Spr, we must also assume a pseudobinary system 
Sprin Su. The whole S-diagram then becomes ternary of which 
already a schematic figure has been constructed (Proc. XIV, 266) 
Prof. Smits has now modified the former ternary figure by omitting 
the region of demiscibility and keeping account with the third crystallised 
modification, the sowfre nacré'). This drawing is given in Fig. 6. The 
above mentioned difficulty does not arise here at all. The lines AD 
and BH from Fig. 3 are lines which in the ternary figure run over 
the surfaces /,S, LS and /,S,Z7S' and therefore are spacial curves which 
may deviate much from the right ones. If we assume that the equili- 
brium Sar Z Sra sets in with infinite velocity there is formed from 
the pseudo ternary figure the pseudobinary Fig. 5, in which the curves 
justmentioned have undergone an intricate projection, whereby a 
crossing May turn into an intersection so that the above mentioned 
intersection at 106° need not signify anything. 
Hence, it is incorrect to assume, as Kruyt, SmrrH, and others, 
that we can deduce from the unary solidification temperature of the 
Sr, the S,-content with the aid of the line of equilibrium, since in 
the projection the situation cf the lines in regard to each other is 
totally changed. Also it is not permissible, as Kruyr has done, to 
first determine the melting point of the rhombic modification and 
then to determine the composition with the aid of the melting point 
when the substance has become monoclinic, for AD and BE need 
not, of course, be situated in one plane. Kruyt’s experiments on the 
melting point of rhombic sulphur clearly indicate this. 
1) See These Proceedings XV p. 369. 
