206 | Mr. Schoolcraft on the 
to the extensive strata of serpentine and other magnesian 
rocks found in various parts of the globe! The Ontonagon 
river at this place is broad, rapid and shallow and filled with 
detached masses of rock out of place, which project above 
the water, and render the navigation extremely difficult, 
during the summer season. The bed of the river is upon 
sand-stone similar to that which supports the Palisadoe 
rocks upon the Hudson. There is an island nearly in the 
centre of the river which serves to throw the current against 
the west bank where the copper reposes, and which as it 
is the only wooded island noticed in the river, may serve 
to indicate the locality of this mineral treasure to the future 
. enquirer. 
Several other masses of native copper have been found 
uropeans, and taken into different parts of the United 
States and of Europe, and a recent analysis of one of these 
west of the Ontonagon, weighed twenty eight pounds, and 
was taken to the island of Michilimackinac some years ago 
by M. Cadotte, and disposed of. It was from this mass 
that the War Department was formerly supplied with a spe- 
cimen, and from which the analysis alluded to, is also un- 
derstood to have been made. About eleven years ago, a 
trader by the name of —— procured from the Indians 
peice of copper weighing twelve pounds which the 
found on an island in Winnebago lake, about a nadred 
miles in a direct line east of the copper rock on the On- 
