A narrow and most difficult passage, twenty feet in length, leads from this cavern to another, twenty-five feet in hight, which is everywhere beset with teeth, bones and stalactitic projections. This cavern is suddenly contracted, so as to form a vestibule of six feet wide, ten long, and nine high, terminating in an opening close to the floor, only three feet wide and two high, through which it is necessary to writhe, with the body on the ground. This leads into a small cave, eight feet high and wide, which is the passage into a grotto, twenty-eight feet high, and about forty-three feet long and wide. Here the prodigious quantity of animal earth, the vast number of teeth, jaws and other bones, and the heavy grouping of the stalactites, produce so dismal an appearance, as to become a perfect model of a temple for a god of the dead. Here hundreds of cart-loads of bony remains might be removed, pockets might be filled with fossil teeth, and animal earth was found to reach to the utmost depth to which the workmen dug. A piece of stalactite, being here broken down, was found to contain pieces of bones within it, the remnants of which were left imbedded in the rock. From this principal cave is a very narrow passage, terminating in the last cave, which is about six feet in width, fifteen in hight, and the same in length. In this cave were no animal remains, and the floor was the naked rock. Thus far only can these natural sepulchers be traced; but there is every reason to suppose, that these animal remains are disposed through a greater part of this rock. Whence this immense quantity of the remains of carnivorous animals could have been collected, is a question which naturally arises; but the difficulty of answering it appears to be almost insurmountable. [Illustration: THE MAMMOTH CAVE.] THE MAMMOTH CAVE. For one of the earliest accounts of this stupendous cavern, which is unparalleled in the entire history of subterranean wonders, we are indebted to Dr. Nahum Ward, who published it in a monthly magazine, in October, 1816. It is in what was formerly Warren, but now Edmonson county, in the state of Kentucky, about ten miles from the great Louisville and Nashville turnpike. The territory is not mountainous but broken, differing in this respect from the vicinity of most other caverns of the same general kind. Not far from the entrance, a hotel is now kept for the accommodation of visitors, as the cave is quite a fashionable resort for travelers during the summer season. Perhaps we shall best gain correct ideas of this wonderful cavern, which is almost a world in itself, having its own seas, mountains, lakes, rivers, &c., by reading first the account given by Dr. Ward, and then that of a visitor who explored it in 1854.