Thus having guided me to my destination they left me. Ahead of me, through the trees, I could see what appeared to be the foot of a steep hill. Toward this I made my way. The forest ran to the very base of a cliff, in the face of which were the mouths of many caves. They appeared untenanted; but I decided to watch for a while before venturing farther. A large tree, densely foliaged, offered a splendid vantage-point from which to spy upon the cliff, so I clambered among its branches where, securely hidden, I could watch what transpired about the caves. It seemed that I had scarcely settled myself in a comfortable position before a party of cave men emerged from one of the smaller apertures in the cliff-face, about fifty feet from the base. They descended into the forest and disappeared. Soon after came several others from the same cave, and after them, at a short interval, a score of women and children, who came into the wood to gather fruit. There were several warriors with them—a guard, I presume. After this came other parties, and two or three groups who passed out of the forest and up the cliff-face to enter the same cave. I could not understand it. All who came out had emerged from the same cave. All who returned reentered it. No other cave gave evidence of habitation, and no cave but one of extraordinary size could have accommodated all the people whom I had seen pass in and out of its mouth. For a long time I sat and watched the coming and going of great numbers of the cave-folk. Not once did one leave the cliff by any other opening save that from which I had seen the first party come, nor did any reenter the cliff through another aperture. What a cave it must be, I thought, that houses an entire tribe! But dissatisfied of the truth of my surmise, I climbed higher among the branches of the tree that I might get a better view of other portions of the cliff. High above the ground I reached a point whence I could see the summit of the hill. Evidently it was a flat-topped butte similar to that on which dwelt the tribe of Gr-gr-gr. As I sat gazing at it a figure appeared at the very edge. It was that of a young girl in whose hair was a gorgeous bloom plucked from some flowering tree of the forest. I had seen her pass beneath me but a short while before and enter the small cave that had swallowed all of the returning tribesmen. The mystery was solved. The cave was but the mouth of a passage that led upward through the cliff to the summit of the hill. It served merely as an avenue from their lofty citadel to the valley below.