The lakes Michigan, Huron, St. Clair and Erie, are now about twenty-five feet lower than lake Superior. The falls of St. Mary, at the outlet of the upper lake, are nothing more than rapids. The water descends twenty-two feet in the distance of three quarters of a mile; and although canoes can pass them either way, yet they are impassable to steamboats and vessels. Some years ago, a large vessel did go down them in safety. It was built on lake Superior, by the north-western Fur Company, but was found to be too large to be useful in their trade. It was taken to the falls of St. Mary, and some Indians were hired to take it down the rapids. They happened to go down in safety; and the vessel was afterwards sold at Buffalo. Now, the probability is, that these lower lakes were once nearly on a level with lake Superior; and their outlet was at the south end of lake Michigan, instead of the Niagara river. Eight or ten miles from the present limits of lake Erie, there is a regular, well defined shore, once washed by the water; plainly indicating that the lake was once about twenty feet higher than it now is. If lake Michigan were ten feet higher than its present level, its waters would flow into the Illinois river. The Oplane, a branch of the Illinois, approaches within twelve miles of the lake; and the land between is low and level. When the water is high, boats now pass from the lake to the river. At a time of high water, a steamboat attempted to pass from the Illinois to the lake. After running a day from Ottawa up the river, the water began to subside, the captain became alarmed, lest his boat might run aground, and returned. The valley of the Illinois river, plainly indicates that a much larger stream once run there. Had its channel been formed by its present quantity of water, it would have been not more than forty rods wide; but now, it carries a breadth of from fifty rods to more than a mile; it is, therefore, full of shoals and sand bars. The high banks all along down the stream, are about two miles apart; and the space between them not occupied by the river, is either a low marsh or a narrow lake. When the lakes were high, aided probably by a strong west wind, the water broke through in the direction of Niagara river; and in process of time, wore a deep channel, drained the lakes to their present level, and dried up their outlet, at the south end of lake Michigan. This is my theory; and whoever will examine the country around the lakes, may not deem it so wild and extravagant a one, as has been advanced and believed by mankind. Many of the inhabitants of Chicago are from the eastern part of the country--civil, enterprising and active. I found good society here--much better than I had expected in a place so new, and of such rapid growth.