After stopping a day or more at Shawneetown, and reconnoitering its vicinity, I proceeded to the mouth of the Cumberland, and from thence, after many days detention at that point waiting for a boat, to the mouth of the Ohio. I found this to be a highly interesting section of the river, from its great expanse and its fine water prospects. The picturesque calcareous cliffs on the west banks, display a novel and attractive line of river scenery. The Ohio had, from its commencement, well sustained the propriety of its ancient appellation of the Beautiful River; but it here assumed something more than beautiful--it was majestic. Let it be borne in mind that this stream, in the course of some seven or eight hundred miles flow from Pittsburg to Shawneetown, had been swelled on the right and left hand by the Scioto, the Muskingum, the Kentucky, the Miami, Green River, Wabash, and other rivers of scarcely inferior size. It is still further augmented, from the left bank, with those noble tributaries, the Cumberland and Tennessee, which bring in the gathered drain of the middle ranges of the Alleghanies. It is below Shawneetown, too, that the cliffs of the Cave-in-Rock-Coast present themselves on the west shore--with their associations of the early robber-era which has been commemorated by the pen of fiction of Charles Brockden Brown. These cliffs are cavernous, and assume varied forms. They rise in bold elevations, which bear the general name of the Knobs, but which are well worthy of the name of mountains. Distinct from the interest they have by casting their castle-like shadows, at sunset, in the pure broad stream, they constitute a kind of Derbyshire in their fine purple spars, and crystalized galena and other mineralogical attractions. I was told that a German of the name of Storch, who pretended to occult knowledge, had, years before, led money and mineral diggers about these Knobs, and that he was the discoverer of the fine fluates of lime found here. One can hardly pass these broken eminences, with the knowledge that they tally in their calcareous structure and position with the rock formation of the Missouri state border, lying immediately west of them, without regarding them as the apparent monuments of some ancient geological change, which affected a very wide space of country north of their position. A barrier of this nature, which should link the Tennessee and Missouri coasts, at Grand Tower, would have converted into an inland sea the principal area of the present states of Illinois, Indiana, and Southern Ohio. The line of separation in this latitude is not great. It constitutes the narrowest point between the opposing rock formations of the east and west shores, so far as the latter rise through and above the soil.