In the midst of these illusions I walked out on a snow-cornice that overhung a precipice! Unable to see clearly, I had no realization of my danger until I felt the snow giving way beneath me. I had seen the precipice in summer, and knew it was more than a thousand feet to the bottom! Down I tumbled, carrying a large fragment of the snow-cornice with me. I could see nothing, and I was entirely helpless. Then, just as the full comprehension of the awful thing that was happening swept over me, the snow falling beneath me suddenly stopped. I plunged into it, completely burying myself. Then I, too, no longer moved downward; my mind gradually admitted the knowledge that my body, together with a considerable mass of the snow, had fallen upon a narrow ledge and caught there. More of the snow came tumbling after me, and it was a matter of some minutes before I succeeded in extricating myself. When I thrust my head out of the snow-mass and looked about me, I was first appalled by a glance outward, which revealed the terrible height of the precipice on the face of which I was hanging. Then I was relieved by a glance upward, which showed me that I was only some twenty feet from the top, and that a return thither would not be very difficult. But if I had walked from the top a few feet farther back, I should have fallen a quarter of a mile. One of my snowshoes came off as I struggled out, so I took off the other shoe and used it as a scoop to uncover the lost web. But it proved very slow and dangerous work. With both shoes off I sank chest-deep in the snow; if I ventured too near the edge of the ledge, the snow would probably slip off and carry me to the bottom of the precipice. It was only after two hours of effort that the shoe was recovered. When I first struggled to the surface of the snow on the ledge, I looked at once to find a way back to the top of the precipice. I quickly saw that by following the ledge a few yards beneath the unbroken snow-cornice I could climb to the top over some jagged rocks. As soon as I had recovered the shoe, I started round the ledge. When I had almost reached the jagged rocks, the snow-cornice caved upon me, and not only buried me, but came perilously near knocking me into the depths beneath. But at last I stood upon the top in safety. A short walk from the top brought me out upon a high hill of snow that sloped steeply down into the woods. The snow was soft, and I sat down in it and slid "a blue streak"--my blue overalls recording the streak--for a quarter of a mile, and then came to a sudden and confusing stop; one of my webs had caught on a spine of one of the dwarfed and almost buried trees at timber-line.