During the night of the 18th, the weather being clear, we continued on our voyage, as is customary with most of the steam-boats navigating the Ohio. It was long since remarked by Mr. Schulz,[032] and considered by him as an inexplicable circumstance, that the reflection, by night, of the image of the banks of the Ohio, does not furnish an infallible guide to the middle of the bed of the river. Nothing is more manifest than that the banks at different places, having different degrees of elevation, and being sometimes naked, and sometimes covered with very tall trees, must, of necessity, cast shadows of different lengths, upon the surface of the water; consequently that the luminous stripe along the middle of the river, from the surface of which the sky and the stars are reflected, must be greatly subject to irregularities in position and direction. This circumstance often proves very annoying to inexperienced pilots, who attempt to navigate the Ohio, or any other river of similar character, by night, as we have had occasion in many instances to experience. On the morning of the 19th we arrived at Louisville[033] having passed, in the night, the boats containing {24} the sixth regiment of infantry, then on their way to the Missouri. At Louisville, we stopped to procure a pilot to conduct our boat over the rapids. Two or three pilots appointed pursuant to an act of the legislature of Kentucky, reside at Louisville, always holding themselves in readiness to go on board such boats as are about to descend the rapids, and leaving them again at Shippingsport; for which service they are entitled to receive two dollars for each ark or raft. At these rapids, called usually the falls of the Ohio, the river descends about twenty-two feet, in a distance of less than two miles. At times of high water an acceleration of current, not usual in other parts of the river, is all that is perceived in passing down this descent: at other times the water is dashed and broken upon the rocky and uneven bed of the channel, called the _Indian chute_, through which a great part of the water passes. The magnificence of a cataract is, however, at no time displayed here; and it is only in peculiar conditions of the atmosphere, that the noise of the fall can be heard at the distance of one-fourth of a mile from the bank of the river.