583 
We have succeeded however, in demonstrating that the new modi- 
fication is formed in pure sulphur also. When sulphur is heated to 
125°, rapidly poured out and powdered and then placed into 8,Cl, 
the solubility is larger than that of rhombic sulphur alone. 
In this way was found : 
1. Sulphur after heating to 125 and rapid cooling mixed with 
SCI, to 69.2 at. °/, of S. Solubility = 56.0 at. °/, of S. 
2. Id. Mixed with S,CI, to 73 at. °/, of S. Solubility = 56.5 at. of S. 
3. Id. Mixed with S,Cl, to 80.9 at. °/, of S. Solubility 58.5 at. °/, 
of 5. 
The solubility at 25° for sulphur, which has not been heated, is 
only 53.5 at. °/, of S. The heated sulphur has, therefore a consi- 
derably larger solubility than the non-heated rhombic sulphur, which 
proves that in the heated sulpbur another modification is also present. 
It has already been explained above that this cannot be amorphous 
sulphur. But it is also shown by the fact that the sulphur content 
of the saturated solutions is all the greater when more sulphur is 
added. Now, the solutions 1—3 indicated above are all saturated 
with amorphous suiphur for this was present in large excess. If now 
the increase in solubility were caused by the amorphous sulphur 
getting dissolved, the solubility from 1—38 ought to be the same. To 
make more sure, the solubility of a mixture of rhombic and amorphous 
sulphur at 25° was determined also. For this was found 54.5 at. °/, 
of S. Even after 24 hours the solution was still somewhat turbid 
owing to amorphous S. The figure 54.5 at. °/, of S is therefore too 
high. Hence, it appears again that the solubility of amorphous sulphur 
is very slight and cannot explain the increase of solubility in expe- 
riments 1—3. 
In connection ‘with his theory of allotropy, Prof. Sirs has pointed 
out, that the system sulphur must be a terrary system. The possible 
relation between the sulphur modifieation we were dealing with, 
and that assumed by Prof. Smits, will Le discussed in a following 
paper, as well as the results of investigations on the molecular weight 
and the permanency of the modification, which are row being 
carried out. 
Amsterdam, Chem. Lab. University. August 1912, 
