Such experiences shake the strongest nerves, and we sat on the shelf we had attained for fully a quarter of an hour before we ventured to attack the next precipice which hung beetling directly above us. It was not as lofty as the one we had just ascended, but it impended to such a degree that we saw we should have to climb our rope while it swung free in the air! Luckily we had little difficulty in getting a grip for the prongs, and we took every precaution to test the security of the anchorage, not only putting our combined weight repeatedly upon the rope, but flipping and jerking it with all our strength. The grapple resisted every effort to dislodge it, and finally I started up, insisting on my turn as leader. The height I had to ascend did not exceed one hundred feet, but that is a very great distance to climb on a swinging rope, without a wall within reach to assist by its friction and occasional friendly projections. In a little while my movements, together with the effect of the slight wind, had imparted a most distressing oscillation to the rope. This sometimes carried me with a nerve-shaking bang against a prominent point of the precipice, where I would dislodge loose fragments that kept Hall dodging for his life, and then I would swing out, apparently beyond the brow of the cliff below, so that, as I involuntarily glanced downward, I seemed to be hanging in free space, while the steep mountain-side, looking ten times steeper than it really was, resembled the vertical wall of an absolutely bottomless abyss, as if I were suspended over the edge of the world. I avoided thinking of what the grapple might be about, and in my haste to get through with the awful experience I worked myself fairly out of breath, so that, when at last I reached the rounded brow of the cliff, I had to stop and cling there for fully a minute before I could summon strength enough to lift myself over it. When I was assured that the grapple was still securely fastened I signalled to Hall, and he soon stood at my side, exclaiming, as he wiped the perspiration from his face: "I think I'll try wings next time!" But our difficulties had only begun. As we had foreseen, it was a case of Alp above Alp, to the very limit of human strength and patience. However, it would have been impossible to go back. In order to descend the two precipices we had surmounted it would have been necessary to leave our life-lines clinging to the rocks, and we had not rope enough to do that. If we could not reach the top we were lost.