238 C. M. Wetherill on crystallization of Sulphur. 
the fragments strictly identical with that of the nearest indigen- 
ous rocks of the same age : 
The facts above cited recall some observations made several 
made especially upon the neighborhood of the junction of the 
“Rotten Limestone” of the Upper Cretaceous, with the argilla- 
ceous and arenaceous strata of the Lower Cretaceous. ‘The 
Pr. ? pees 
nection with others, to some ancient, glacial or hydrographical 
area, 
University of Michigan, August 4, 1865. 
Art. XXXV.—On the Crystallization of Sulphur and upon the 
Reaction between Sulphid of Hydrogen, Ammonia and Alcohol; 
by Cuaries M. WETHERILL, Ph.D. M.D. 
SULPHUR, in three of its four allotropic conditions, has been 
well studied, notwithstanding the difficulties which the rapid pas 
sage of (7S) through (®S) to (#8) presents to experiments 
upon the first two modifications. a 
_ The most reliable specific gravities which have been assigned 
to the different forms of sulphur are the following: 
: ; Marchand & Scbeerer. Deville. 
Rhombic octohedral (« S) 2-045 2-07 
Oblique prismatic (2S) 1982 1:96 
_ The red, amorphous (y $) 1-957 1-91 
__ * Quar. Jour. Geol. Soe, vii, 56, Reprinted, Am. Jour. Sci and Arts, [2], *¥)72 
