‘At the falls of Peckagama, the first rock stratum, and the first wooded island, is seen. Here the river has a fall of twenty feet; and from this to the falls of St. Anthony, a distance of six hundred and eighty-five miles, exhibits its second characteristic division. At the head of the falls of Peckagama, the prairies entirely cease; and below, a forest of elm, maple, birch, oak, and ash, overshadows the stream. The black walnut is first seen below Sandy Lake river, and the sycamore below the river De Corbeau. The river, in this distance, has innumerable well wooded islands, and receives a number of tributaries, the largest of which is the river De Corbeau, its great south-western fork. The Pine, Elk, Sac, and Crow rivers, also enter on the west, and the St. Francis and Missisawgaiegon, on the east. The course of the river, although serpentine, is less so, than above the falls of Peckagama, and its bends are not so short and abrupt. Its mean width may be estimated at three hundred feet until the junction of the De Corbeau, and below that at two hundred and fifty yards. Its navigation is impeded, agreeably to a memorandum which I have kept, by thirty-five rapids, nineteen ripples, and two minor falls, called the Little and the Big Falls, in all of which the river has an aggregate descent of two hundred and twenty-four feet in fourteen thousand six hundred and forty yards, or about eight miles. The mean fall of the current, exclusive of the rapids, may be computed at six inches per mile, and its velocity at three miles per hour. In the course of this distance it receives several small turbid streams, and acquires a brownish hue, but still preserves its transparency, and is palatable drink-water. A few miles above the river Corbeau, on the east side, we observe the first dry prairies, or natural meadows, and they continue to the falls of St. Anthony. These prairies are the great resort of the buffalo, elk, and deer, and are the only parts of the banks of the Mississippi where the buffalo is now to be found. Granite rocks appear at several of the rapids, in rolled pieces, and in beds; and in some places attain an elevation of one or two hundred feet above the level of the water, but the banks of the river are generally alluvial.