1911-12.] Freezing-Points of Rhombic Sulphur and Soufre Nacre. 3 
S m , 113'5° (Muthmann) — having been determined before the tendency of 
S M to depress the freezing (and melting) points, the influence of catalytic 
agents in hastening or retarding the formation of S M , the distinction 
between ideal and natural freezing-points, etc., were known, are clearly 
erroneous in varying degrees. So also Tammann’s results and much- 
quoted diagram showing the effect of pressure upon the transition points 
of sulphur represent a cross between the ideal and the natural states. The 
corresponding points, especially at high pressures, which favour the forma- 
tion of S,*, would show differences of the order of 10-30°. 
{Issued separately January 10 , 1912 .) 
