588 
the rise of 7 — could be readily traced, from which it appeared 
that this, with ever decreasing velocity, rose until 95.45° was 
reached, which temperature is the true unary transition tempe- 
rature. Hence, we see that 7’— can be lowered by S, fully 20°. 
In harmony therewith is also the fact that starting from S,-free 
sulphur, ReicHer (Dissertation) obtained, as he thought, diverging 
results, namely first a transition temperature of 97° which tempera- 
ture he found in course of time on the decrease until the unary 
transition temperature 95°,45 was reached at which S, is present) 
Simultaneously with the result mentioned above several experiments 
were communicated which contrary to Kruyt’s investigation (Z. f. 
phys. Ch. 64 513) removed all grounds for the assumption of a 
metastable region of demiscibility in the pseudo system. It appeared 
that the occurrence of two layers is due to the difference in tem- 
perature which between the two layers may amount to even from 10 
to 30°. When the heat conductivity was improved by the introduction 
of platinum wire or small gauze this phenomenon occurred less dis- 
tinctly or not at all. Quite in harmony therewith is also the influence 
which an alteration in the diameter of the sulphur tubes exerts on 
the appearance of two lavers. That we are not dealing here with a 
metastable region of demiscibility appeared, contrary to Krurr, also 
from the fact that in the presence of NH,, which is a positive catalyst, 
that apparent unmixing occurred still better, notwithstanding we 
now follow the equilibrium line. While Kruyr believed that there 
existed a constant three-phase temperature S, with two liquid layers 
at 110° (intersecting point of the solidifying line of Sy, with the 
region of demiscibility, point d of Fig. 4), this also did not prove 
correct as, on inoculation with monoclinic sulphur, solidification 
temperatures of 108° and 109° were observed and, when starting 
from pure Sz, even 106°. 
As the last publication I mention Krvyt’s lecture which contains 
pretty well the same as the article in the Chem. Weekblad except 
that Fig.3 occurs also.*) From this we notice that Krurr now assumes 
that C (T— of S,-free sulphur) lies at 94°.8, GH at 95°.6 (unary 
temp. really 95°.45). In what manner these experiments have been 
carried out, is, however, not communicated. They must be fauity or 
1) Gernez also gives too high values (97°.6—98°.4). As GERNEz only observed 
SRh->SM and not Sj SRh his figures are likely to be too high and do not 
prove much. 
2) In the Fig. Kruyt draws the Sz, to the right. The reason that | always 
place it to the left is that I do not want to depart from the custom to place the 
substance with the lowest m.p., therefore, presumably S», to the left. 
