A List of Minerals and Organic Remains. 61 
ving in the Canadas, which has been read before the Lyce- 
um of Natural History of New-York. 
From this list | have scrupulously rejected all minerals 
of doubtful character, and have never adverted to locali- 
ties which have been already announced; without some 
purpose evident in the context. 
With respect to fossils, I wish this communication to be 
considered as a transient notice, to assist temporarily in 
the study of the secondary formations of North-America. 
All the substances here mentioned, have been examin- 
ed by the geologists of this country, and of Europe, and 
are to be found in their cabinets. _ 
n the plurality of cases, for obvious reasons, I shall 
avoid a detail of mineral characters, and confine myself to 
rapid sketches of geological relations. 
Beryl.—Rainy Lake, two hundred and thirty miles north 
from Lake Superior. I found only two specimens, the 
largest of which is one quarter of an inch long, and one 
sixteenth of an inch broad, in a well characterized six sided 
prism, translucent, pale green; imbedded in porphyritic 
granite, in which a brown feldspar is predominant, the 
mica being black and scanty. It occurs on the east side 
of the lake, subordinate to vast tracts of gneiss, which runs 
. N. E. and changes in places, by insensible degrees, 
into mica-slate, chloritic and greenstone slate, and sienite. 
This lake is two hundred and ninety-four miles round, as 
measured by circumnayigating it from point to point only, : 
ofthe successive bays. 
Schorl.—In the Lake of the Thousand Islands, below 
Kingston, in Upper Canada; north-east coast of Lake 
Huron, in two distant places; Cape Tourment, thirty 
miles below Quebec, Malbay, &c. Lower Canada: velvet 
black, opaque—in six and nine sided prisms, usually small, 
but rarely ten inches in length, and one and an half inches 
in breadth—-sometimes curved. It abounds in fragments 
in the puddingstone of the Thousand Islands, interposed 
between gneiss and horizontal limestone. 
he most remarkable deposit with which I am acquaint- 
ed, is on Yeo’s Island, one of the Thousand Islands, near 
the upper end of 'I'ar Island, and on the south side of the 
English channel. Yeo’s Island (about three hundred yards 
o 
