1883. 19 Trans. N. Y. Ac. Sci. 
ing vein has yet been opened. The following localities were re- 
ferred to; the vein at Bristol, Conn. : the Schuyler Copper Mine 
at Belleville, N. J. ; many points along and on the east side of the 
Alleghany belt, and in the Rocky Mountains, both on their east 
and west slopes; deposits which have been worked, though with 
little success, as well as the concretionary ore and copper replac- 
ing wood in the Indian Territory, New Mexico, etc. ‘These latter 
indicate an extraordinary impregnation of a shallow sea, in which 
the Triassic strata were deposited, and the copper was thrown 
down in association with salt and gypsum. It is a question, yet 
unsolved, why these Triassic rocks were so impregnated with cop- 
per. Toward the old shore of this sea, more and more silver was 
thrown down with the copper, until near the margin, at Silver 
Reef, its quantity became sufficient for working. The deposit of 
these ores appeared to be one of the accompaniments of the ex- 
trusion of the trap. 
In reply to inquiries by Profs. Huspsparp and Martin, the 
PRESIDENT further stated that masses of native copper sometimes 
occurred, but usually only scales, rarely pieces up to a half pound 
in weight ; and that ores containing even as low an amount as five 
or six per cent. of copper have been profitably worked. 
In the Eastern States, the impregnation of the Triassic rocks 
with copper was apparently one of the results of the eruptions of 
trap through them, and the copper was perhaps derived from the 
Archzean rocks below, which contained much copper, brought up 
dissolved in hot water. In the West, the copper was probably con- 
tained in the drainage of the old lands which formed the shores of 
the shallow Triassic sea, and was precipitated by evaporation. 
Near the Wasatch Mountains, the western boundary of the Trias, 
the copper was associated with considerable silver, as at the Silver 
Reef Mines, and both metals were probably derived from the 
leaching of the old land which occupied portions of Utah, Nevada, 
etc., and which in ancient as well as modern times was a region 
rich in ores. 
A number of curious crystals of calcium carbonate, apparently 
calcite, with hexagonal form, found in clay, at Laramie City, were 
then exhibited by a member, Mrs. WELD. 
