Sia 
considerable quantity of sulphur, about as much as the solution 
saturated at 20° originally contained '). It also appeared that the 
conversion, which has taken place here retrogrades very slowly, for 
after 20 days the quantity of dissolved sulphur had decreased but 
very little. 
The sulphur which was added originally as rhombic sulphur and 
consequently was present in the liquid as 5; apparently undergoes 
some conversion or other on heating, for after the heating some 
S, has disappeared. The question now arises: what has become of 
this S;? Does it pass into another modification of sulphur or is 
there a compound formed of S with 5,Cl,? At one time [ thought 
I ought to arrive at the latter conclusion, because in other solvents 
metaxylene for instance, the same phenomenon could not be observed. 
Krurr ®) on the other hand is of opinion that the cause of the dis- 
appearance of S) is situated in a transformation into amorphous 
sulphur S,. From what follows it will appear that neither of these 
views is correct. 
I have again resumed the investigation of the above phenomenon 
in consequence of a publication by RoriNJanz *), in which are com- 
munieated the results of the determinations of the viscosity of sul- 
phur at different temperatures with and without addition of iodine. 
With molten sulphur without iodine, the course of the viscosity, 
as function of the temperature to which the sulphur has been heated, 
may be readily explained, because a transformation 5; 225, takes 
place which proceeds comparatively slowly, so that with more rapid 
changes in temperature there exists no equilibrium between the two 
kinds of molecules. On rapid cooling, for instance the condition 1s 
such as corresponds with an equilibrium at a higher temperature. If, 
however, we endeavour to apply the same explanation to- molten 
sulphur to which a trace of iodine has been added, we meet with 
difficulties as will be shown in a more elaborate article to appear 
shortly. The course of the viscosity cannot be explained here by 
the assumption that in the molten sulphur the above transformation 
SS, takes place. Presumably, a third modification of sulphur 
occurs here, as an iodine-sulphur compound does not exist, at least 
not in the solid condition. The same may now happen with mixtures 
of sulphur and sulphur chloride. 
The investigation was, therefore, directed in the first place to 
decide what becomes of the S; when this is heated with S,Cl,*to a 
1) Z. für pliysikalische Chemie. 54. (1905). 58. 
Z. fiir physikalische Chemie. 64. (1908). 545. 
Z. fiir physikalische Chemie. 62. (1908). 609. 
9 
) 
5) 
