surface of its rival; but entering, as it does, at right angles, its waters are met in their headlong course, and almost rolled back upon themselves for an instant by the mighty momentum of the flood they strike. This is manifested by, and accounts for, that well-defined line of light mud-colour extending from bank to bank across its mouth, bounded by the dark blue of the Upper Mississippi, and flowing sluggishly along in a lengthened and dingy stain, like a fringe upon the western shore. The breadth of the embouchure is about one mile, and its {88} channel lies nearly in the centre, bounded by vast sand-bars--sediment of the waters--upon either side. The alluvial deposites, with which it is heavily charged, accumulate also in several islands near the confluence, while the rivers united spread themselves out into an immense lake. As the steamer glides along among these islands opposite the Missouri, the scene with its associations is grand beyond description. Far up the extended vista of the stream, upon a lofty bluff, stands out a structure which marks the site of the ancient military post of "Belle Fontaine;"[79] while on the opposite bank, stretching inland from the point heavily wooded, lies the broad and beautiful prairie of the "Mamelles."[80] Directly fronting the confluence stand a range of heights upon the Illinois shore, from the summit of which is spread out, like a painting, one of the most extraordinary views in the world. The Mississippi, above its junction with its turbid tributary, is, as has been remarked, a clear, sparkling, beautiful stream; now flashing in silvery brilliance over its white sand-bars, then retreating far into the deep indentations of its shady banks, and again spreading out its waters into a tranquil, lakelike basin miles in extent, studded with islets.