Our guides had attached themselves and us with cords, each three persons together, as when passing the glacier. They were provided with large iron cramps fastened to their feet, which prevented them from slipping. Doctor Van Ranselaer and myself had found this contrivance impede too much our walking, and after a short trial had given it up, so that we had to rely on the firmness of foot of those guides to whom we were tied, to preserve us in case of our falling. I am not entirely convinced, that if one of us had had the misfortune to fall, and were slipping down the declivity, he would not have drawn his two companions, in spite of these precautions, over the precipice. To add to our difficulties, the sun was excessively bright, and almost blinded us, notwithstanding the gauze veils with which we were all provided. Fortunately, we met with but few crevices; however, on passing one of these that was hid by the snow, I suddenly sunk, but my body being thrown forward by this motion, my breast opposed a larger surface to the snow which thus supported me, and I was easily extricated by a guide. On looking back through the hole I had broken, I could perceive the black cavity beneath. At one period, our path necessarily led us close under a wall of snow, more than 150 feet high, from the top of which projected several large masses of snow, that appeared to require only a touch to bring them down on our heads. Our captain pointed out our danger, and enjoined us to pass as quickly as possible, and to observe the strictest silence. When we looked up at these -------- Toppling crags of ice, The avalanches, whom a breath draws down In mountainous o'erwhelming, we felt no disposition to disobey his directions, but passed on with hurried step, and in the stillness of death. The inhabitants of those parts of the Alps, exposed to these avalanches, assert that the concussion of the air, produced by the voice, is often sufficient to loosen, and bring down their immense masses. Hence the muleteer is often seen to take the bells from his animals, when he passes through a valley subject to this danger. A few years since some young men, relying on the solidity of the ice, and wishing to try the echo, were so imprudent as to discharge a pistol in a large cave which is at the lower edge of the glacier des Bois, near Chamouny. The shock brought down the roof, which crushed them on the spot.