The climb to the base of the cliff was long and slow. When he reached it he saw that it would be impossible to get far up if he carried his gun with him, so he left it here, resting against a rock, and clambered up toward the nest for thirty or forty feet, and then he reached a place where he could get no further. But a little below, he had passed a narrow shelf, running out to one side, and going down to this, he made his way very carefully under the cliff to a crevice, up which he worked a short distance, and then this ran out and ended in a bare, smooth wall. He would have to give it up: the nest could not be reached. He thought it would be shorter and easier to follow the crevice down to the steep hillside at the foot of the cliff, instead of going back along the shelf, as he had come. Going down was easy, until he had almost reached the foot of the wall, and could see, five or six feet below him, ground on which he could walk. Here the crevice ended. It was rather a long jump down to the ground, and that sloped off so sharply that he did not feel sure that if he jumped he could stop himself. He turned around, therefore, and let himself down backward, feeling with his toes for some little knob of rock on which to rest his feet, but, as he let himself down the rock all seemed smooth, and he could find no foothold. He was now clinging by the ends of his fingers to the rock above, too far down to draw himself up again, and yet with his feet a foot or more above the ground. There was nothing for it but to let himself go, and he dropped. The slope which his feet struck was too steep for a foothold. He fell over backward, and rolled thirty or forty feet down the slope, bringing up in a clump of bushes. Jack was a little shaken and bruised by his roll, but not hurt. He picked himself up and looked back at the way he had come, and congratulated himself that it had been no worse. He started to climb up the slope again to get his gun, but first it was necessary that he should get out of the brush into which he had rolled. To his right there seemed a place where the bushes were thinner than those over which he had passed on his way down, and he turned in this direction to make the ascent. He had gone only a few steps when he stopped, for there before him was a great dark hole in the side of the hill. It was shaped almost like a door, high, and not very wide, and within all seemed black. Grass and bushes grew up in the entrance, and there was no sign that anything ever passed in or out.