The first apartment you enter is about twenty-five feet high, and fifteen broad, and extends a considerable way to the right and left, the floor ascending towards the former; here it is very moist, from the quantity of water continually trickling from the roof. Fahrenheit’s thermometer, which stood at 67° in the air, fell to 61° in this room. A few yards to the left, on the side opposite to you on entering, a passage presents itself, which leads to a sort of anti-chamber as it were, from whence you proceed into the sound room, so named from the prodigious reverberation of the sound of a voice or musical instrument at the inside. This room is about twenty feet square; it is arched at top, and the sides of it, as well as of that apartment which you first enter, are beautifully ornamented with stalactites. Returning from hence into the antichamber, and afterwards taking two or three turns to the right and left, you enter a long passage about thirteen feet wide, and perhaps about fifteen in height perpendicularly; but if it was measured from the floor to the highest part of the roof obliquely, the distance would be found much greater, as the walls on both sides slope very considerably, and finally meet at top. This passage descends very rapidly, and is, I should suppose, about sixty yards long. Towards the end it narrows considerably, and terminates in a pool of clear water, about three or four feet deep. How far this pool extends it is impossible to say. A canoe was once brought down by a party, for the purpose of examination, but they said, that after proceeding a little way upon the water the canoe would not float, and they were forced to return. Their fears, most probably, led them to fancy it was so. I fired a pistol with a ball over the water, but the report was echoed from the after part of the cavern, and not from that part beyond the water, so that I should not suppose the passage extended much farther than could be traced with the eye. The walls of this passage consist of a solid rock of limestone on each side, which appears to have been separated by some convulsion. The floor is of a deep sandy earth, and it has repeatedly been dug up for the purpose of getting saltpetre, with which the earth is strongly impregnated. The earth, after being dug up, is mixed with water, and when the grosser particles fall to the bottom, the water is drawn off and evaporated; from the residue the saltpetre is procured. There are many other caverns in this neighbourhood, and also farther to the westward, in Virginia; from all of them great quantities of saltpetre are thus obtained. The gunpowder made with it, in the back country, forms a principal article of commerce, and is sent to Philadelphia in exchange for European manufactures. [Sidenote: MADDISON’S CAVE.]