56 TRANSACTIONS OF THE [jAN. 14, 
January 14, 1889. 
STATED MEETING. 
The President, Dr. NEWBERRY, in the chair. 
Sixteen persons present. 
Dr. NEwBERRY exhibited a new mineral, arsenide of plati- 
num, recently described under the name of Sperrylite (PtAs,), 
occurring in metallic crystalline grains at the Vermilion Mine, 
Algoma, Canada. He remarked upon the great interest attach- 
ing to such a novel compound, and read the description by Mr. 
H. L. Wells, as published in the Amer. Journ. Science for the 
current month. 
Mr. GrtorGE F. Kunz referred to other arsenides, especially 
that of silver, already described. 
A paper was read, contributed by Mr. JoHN Everman, of 
Easton, Pa., and entitled: 
ON THE MINERALOGY OF THE FRENCH CREEK MINES, 
PENNSYLVANIA. 
At a meeting of the Academy held January 12th, 1885 
(Trans. New York AcapD. Sct., Vol. IV., p. 41), the late Mr. 
B. B. Chamberlin read a paper on the minerals of the above 
locality. As only a few of the minerals were then described, 
and as these mines have lately produced some wonderful speci- 
mens, the writer will endeavor to give a description of all the 
occurrences at this locality. 
The mines are situated on a granite-augitic trap-dyke. The 
whole mass of trap, although quite narrow at the mines, widens 
with wonderful rapidity as it proceeds westward. ‘The dyke at 
the mines is bounded on both sides by the Mesozoic (Jura [?] 
Trias) red sandstone. ‘Three miles due west, a ridge of Potsdam 
quartzite outcrops. ‘Three-cighths of a mile due south, and im- 
mediately on the south bank of the French Creek, the ‘‘ Azoic 
slates” (of Frazer) are noticed. The greatest length of this 
trap-dyke is nearly eight miles. 
There are three shafts, the deepest of which (Shaft No. 1) has 
worked to a depth of 390 feet. It is about 500 feet from the 
W. and N. Station. This shaft appears to produce the greatest 
variety as well as the best developed specimens, the perfect 
crystals of pyrite and chalcopyrite coming from the 250 feet 
level in this shaft. 
