Dr. Mallet on Red Sulphur. 185 
Oxyd of zite,- 6438 6p tint he 6 ea ee 
Protoxyd of: won +) pi: lng Ayes, SE 
Oxyd of manganese, 4) Btn} (em trace 
Silica, - ee ree ae ere ee 
Carbon, : Sea See es 08 
99°70 
. Onei é 
Report upon the Geology of Pennsylvania, Z: 214. It was from 
the walls of a furnace in Cumberland Co. (Pe 
nace in Shropshire (En land), has been described by Prof. Crace- 
Calvert,* an contained 
sulphuret of zinc 2-00, carbon 2°45, silica -45=100:00. The iron 
vine, but without detecting any indication of its presence; possi- 
bly the limestone used as flux may be found to contain a little 
blende diffused through it. 
University of Alabama, Nov. 12, 1856. 
es 
| XXT.— Note on “ Red Sulphur ;” by J. W. Matxet, Ph.D., 
Professor of Chemistry in the University of Alabama. 
IN a paper by M. Ch. Sainte-Claire Deville, published in the 
Midler ey Ohi 7 te et de Physique for May, 1856, in toro the 
various modifications which sulphur undergoes when heated are 
yonsidered, the author states that the red variety of sulphur can 
be produced only by subjecting the same mass of this substance 
several times alternately to heat and rapid cooling, the permanent 
red coloration being never obtained by one tempering. — 
agnus speaks in the same way of this modification of sul- 
phur in his memoir contained in the number of the same journ 
for June, 1856. 
* Number of the “Chemist” for Sept. 1856, p. 706. 
*SCOND SERIES, VoL. XXIII, NO. 68,—MARCH, 1857, 
24 
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