This cave has been visited by most persons who have passed up the Mississippi, if we may judge from the number of names found upon the walls. Among them, we were informed, was that of Captain Carver, who visited it in 1768, but we did not observe it. His grant of land from the Indians is dated in this cave, but the cave itself appears to have undergone a considerable alteration since that period, for he says that “about twenty feet from the entrance begins a lake, the water of which is transparent, and extends to an unsearchable distance.” As the rock is of a very friable nature, and easily acted upon by running water, it is probable that the lake has been discharged, thus enlarging the boundaries of the cave. He also remarks, “at a little distance from this dreary cavern, is the burying-place of several bands of the Nawdowessie (Sioux) Indians. Though these people have no fixed residence, living in tents, and abiding but a few months in one spot, yet they always bring the bones of their dead to this place; which they take the opportunity of doing when the chiefs meet to hold their councils, and to settle the public affairs for the ensuing summer.” We noticed no bones or traces of interment about the cave, but perhaps a further examination of the adjacent region would have led to a discovery.’ In Kentucky and Tennessee, caves are numerous, which appear to have been used for burial-places. In the county of Ulster, in New York, is a cave three quarters of a mile in length, caused by a stream running under ground. The rock which constitutes the roof and sides of the cave is a dark colored limestone, containing impressions of shells, calcareous spar, and beautiful white and yellow stalactites. At one end is a fall of water, the depth of which has not been fathomed. At Rhinebeck, near the Hudson, is a cave in which a narrow entrance leads to several spacious rooms, abounding with columns of stalactites. At Chester, in Warren county, there is a stream which passes under a natural bridge, and among many deep caverns; the waters enter in two streams, unite in the subterranean passage, and issue in a single current under a precipice sixty feet in height. In the Laurel Mountain, in Pennsylvania, is a cavern with a very narrow entrance, and various winding passages, which has been traversed two miles. It is formed of a soft sandstone, and its roof is covered with millions of bats. At Durham in Bucks county, on the Delaware, is a cave in the limestone rock, abounding with pools and rivulets of water. At Carlisle is another somewhat similar, in which human bones have been discovered. GENERAL REMARKS ON CAVES.