Walking along the verge of this hollow, you come to a ravine, leading to Green River, whence you command a view of what is supposed to be the main entrance to the cave. It is a huge cavernous arch, filled in with immense stones, as if giants had piled them there, to imprison a conquered demon. No opening has ever been effected here, nor is it easy to imagine that it could be done by the strength of man. In rear of the hotel is a deep ravine densely wooded, and covered with a luxuriant vegetable growth. It leads to Green River, and was probably once a water course. A narrow ravine, diverging from this, leads, by a winding path, to the entrance of the cave. It is a high arch of rocks, rudely piled, and richly covered with ivy and tangled vines. At the top, is a perennial fountain of sweet and cool water, which trickles down continually from the centre of the arch, through the pendent foliage, and is caught in a vessel below. The entrance of this wide arch is somewhat obstructed by a large mound of saltpetre, thrown up by workmen engaged in its manufacture, during the last war. In the course of their excavations, they dug up the bones of a gigantic man; but, unfortunately, they buried them again, without any memorial to mark the spot. They have been sought for by the curious and scientific, but are not yet found. As you come opposite the entrance of the cave, in summer, the temperature changes instantaneously, from about 85 deg. to below 60 deg., and you feel chilled as if by the presence of an iceberg. In winter, the effect is reversed. The scientific have indulged in various speculations concerning the air of this cave. It is supposed to get completely filled with cold winds during the long blasts of winter, and as there is no outlet, they remain pent up till the atmosphere without becomes warmer than that within; when there is, of course, a continual effort toward equilibrium. Why the air within the cave should be so fresh, pure, and equable, all the year round, even in its deepest recesses, is not so easily explained. Some have suggested that it is continually modified by the presence of chemical agents. Whatever may be the cause, its agreeable salubrity is observed by every visitor, and it is said to have great healing power in diseases of the lungs. The amount of exertion which can be performed here without fatigue, is astonishing. The superabundance of oxygen in the atmosphere operates like moderate doses of exhilarating gas. The traveller feels a buoyant sensation, which tempts him to run and jump, and leap from crag to crag, and bound over the stones in his path. The mind, moreover, sustains the body, being kept in a state of delightful activity, by continual new discoveries and startling revelations.