The rock consists of a mass of native copper in a tabular boulder of serpentine. Its face is almost purely metallic, and more splendent than appears to consist with its being purely metallic copper. There is no appearance of oxidation. Its size, roughly measured, is three feet four inches, by three feet eight inches, and about twelve or fourteen inches thick in the thickest part. The weight of copper, exclusive of the rock, is not readily estimated; it may be a ton, or a ton and a half. Old authors report it at more than double this weight. The quantity has been, however, much diminished by visitors, who have cut freely from it. I obtained adequate specimens, but found my chisels too highly tempered, and my hammer not heavy enough to separate large masses. Having made the necessary examinations, we took our way back up the elevated banks of the river, and across the forest about six miles, to the final place of debarkation of Gov. Cass and his party. But our fears were at once excited on learning that the Governor, with his guide, Wabishkepenais, had not reached the camp. It was already beginning to be dark, and the gloom of night, which is impressive in these solitudes, was fast closing around us. Guns were fired, to denote our position, and a light canoe was immediately manned, placed in charge of one of the gentlemen, and sent up the river in search. This canoe had not proceeded a mile, when the object of search was descried, with his companions, sitting on the banks of the river, with a real jaded air, with his Indian guide standing at no great distance. Wabishkepenais had been bewildered in his tracks, and finally struck the river by the merest chance. The Governor, on reaching camp, looked as if he had been carried over steeps and through gloomy defiles, which had completely exhausted his strength, and he was not long in retiring to his tent, willing to leave such rough explorations for the present, at least, to other persons, or, if he ever resumed them, to do it with better guides. Poor Wabishkepenais looked chagrined and as woebegone himself as if he had encountered the bad influences of half the spirits of his Indian mythology; for the fellow had really been lost in his own woods, and with a charge by whom he had felt honored, and employed his best skill to conduct. The camp-fires already threw their red glare among the trees as night spread her sable pall over us. The tents were pitched; the canoes turned up on the shore to serve as a canopy for the men to sleep under. Indians and Canadians were soon engaged at their favorite pipes, and mingled their tones and hilarious conversation; and we finally all slept the sounder for our eventful day's toils and misadventures. But deeply printed on our memory, and long to remain there, are the thrilling scenes of that day and that night.