+95 
with increase in volume, erystallisation will occur at an increased 
and solution at-a reduced pressure. This is, moreover, in conformity 
with the change in pressure in the points A and R’ along the 
saturation line under its own vapour pressure. 
The same considerations as the above-cited may be also applied 
to the case when the substance /’ melts with decrease in volume. 
(To be continued). 
Chemistry. — “The dynamic Allotropy of sulphur.” (Fifth commu- 
nication.)') By Dr. H. R. Krerr. (Communicated by Prof. 
P. vaN ROMBURGH.) 
(Communicated in the meeting cf January 25, 1913). 
As point 5 of the resume of my third paper on the above subject 
I wrote in 1909: 
“Es wurden neue Untersuchungen über den Einfluss des S, auf 
den Umwandlungspunt Sn 22 Smon in Aussicht gestellt’’. 
In connection therewith I wrote’) in July 1911: 
“Dr. van Kroosrer of Groningen has this year started that investi- 
gation and although the provisional result is only -of a qualitative 
character as yet it may be taken for granted . ds 
Nevertheless, Messrs. Smits and pr Leeuw published, im these 
Proceedings (XIV, p. 461), an investigation concerning this question. 
In the Zeitschr. f. Electrochemie*) | communicated, in connection 
with some other questions regarding sulphur, that the above investi- 
gation bad been continued and brought to a close, also to what 
conclusions it had led and that a detailed communication would soon 
appear; recently it appeared as the fourth communication in this 
series. 
Meanwhile, Dr. pe Leeuw (Proc. XV p. 584) has contradicted the 
above cited conclusions and condemned the still unpublished investi- 
gations in advance. 
Although I should have every reason not to take any notice of that 
paper, two reasons in particular have induced me to repeat and extend 
1) For the previous communications see Zeitschr. f. physik. Chem. viz. I: 64, 
513 (1908); ll: 65, 486 (1909); IIL: 67, 321 (1909) and IV; 81, 726 (1913). 
2) Chem. Weekbl. 8, 645 (1911). 
5) Z. f. Elektrochemie 18, 581 (1912). 
