PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
VOL. XXXII. 1911-12. 
I. — The Freezing-Points of Rhombic Sulphur and of Soufre 
Nacre. By Alexander Smith and C. M. Carson. 
(MS. received July 27, 191 1. Read November 6, 1911.) 
The following symbols may be used to designate the well-characterised 
forms of sulphur : S D rhombic ; S n , ordinary monosymmetric ; S m , soufre 
nacre ; S IV , Muthmann’s fourth modification ; S*, liquid soluble sulphur : 
S M , insoluble sulphur. 
S m , soufre nacre (Gernez), is easily obtained by heating melted sulphur 
to 150°, placing the test-tube in a bath at 98-100°, and gently rubbing the 
YOL. XXXII. 1 
