the new modification of sulphur will now have the course of PBG Y 
in Fig. 3° for a temperature 7. The sotubility line of 5; in mixtures 
of S,CI, and the new modification will be 7DFV at the tempe- 
ROE e, 
We can now deduce in exactly the same manner as in Fig. 2¢ 
100 R 
_ 
ox 
Ss 
ze iS 
oo 
Je 
dop 5 2 
zg 
u 
ae 
Es 
ous 
_— 
COU 8 
wn 
P Composition of the original mixture. 
20 40 60 GO 100 
Fig. 50 
what is the gross composition of a given mixture, which after heating 
to 7’, is saturated with 8, at ¢,. If we do this with different com- 
positions we find that the composition of the saturated solution asa 
function of the original composition is given by the line PAL in 
Fig. 3°. If we repeat the same construction for mixtures which are 
heated to 7’, and for solubilities at ¢, and ¢, we find the lines PBR, 
QCR and QDR. These lines all converge in one point. At J00 at. 
°/, S of the original composition, the composition ef the saturated 
solution is also 100 at. °/, S the temperature to which the mixture 
was heated or independently of temperature at which the solubility 
has been determined. 
Hence, there exists a characteristic difference between the course 
of the solubility Jine with a compound and a new modification. 
Therefore, it was expected that in this manner we might decide 
with which of the two cases we are dealing here. 
Before proceeding to the actual solubility determinations it was 
ascertained at what temperature the transformation of 5, becomes 
