The localities of the following plants are transcribed from a catalogue kept during the progress of the expeditions, and embrace many plants common to our country, which were collected barely for the purpose of comparison. A more detailed account will be published at some future day.

VII.
MINERALOGY AND GEOLOGY.

1. A Report on the Existence of Deposits of Copper in the Geological Basin of Lake Superior. By Dr. D. Houghton.

Fredonia, N. Y., November 14, 1831.

Sir: In fulfilment of the duties assigned to me in the late expedition into the Indian country, under the direction of H. R. Schoolcraft, Esq., Indian Agent, I would beg leave to transmit to you the following observations relative to the existence of copper in the country bordering on the southern shore of Lake Superior.

It is without doubt true that this subject has long been viewed with an interest far beyond its actual merit. Each mass of native copper which this country has produced, however insulated, or however it may have been separated from its original position, appears to have been considered a sure indication of the existence of that metal in beds; and hence we occasionally see, upon maps of that section of our country, particular portions marked as containing "copper mines," where no copper now exists. But, while it is certain that a combination of circumstances has served to mislead the public mind with regard to the geological situation and existing quantity of that metal, it is no less certain that a greater quantity of insulated native copper has been discovered upon the borders of Lake Superior, than in any other equal portion of North America.

Among the masses of native copper which have engaged the attention of travellers in this section of country, one, which from its great size was early noticed, is situated on the Ontonagon River, a stream which empties its waters into the southern part of Lake Superior, 331 miles above the Falls of the Ste. Marie. The Ontonagon River is, with some difficulty, navigable by batteaux 36 miles, at which place, by the union of two smaller streams—one from an easterly and the other from a westerly direction—the main stream is formed. The mass of copper is situated on the western fork, at a distance of six or eight miles from the junction.

The face of the country through the upper half of the distance from Lake Superior is uneven, and the irregularity is given it by hills of marly clay, which occasionally rise quite abruptly to the height of one or two hundred feet. No rock was observed in situ, except in one place, where, for a distance, the red sandstone was observed, forming the bed of the river.

The mass of copper lies, partly covered by water, directly at the foot of a clay hill, from which, together with numerous boulders of the primitive rocks, it has undoubtedly been washed by the action of the water of the river. Although it is completely insulated, there is much to interest in its examination. Its largest surface measures three and a half by four feet, and this, which is of malleable copper, is kept bright by the action of the water, and has the usual appearance of that metal when worn. To one surface is attached a small quantity of rock, singularly bound together by threads of copper, which pass through it in all directions. This rock, although many of its distinctive characters are lost, is evidently a dark colored serpentine, with small interspersed masses of milky quartz.