The misgivings of the old gentleman concerning the wisdom of my move grew stronger when he perceived how weak I was, as we proceeded on mule-back up the slope of Sierra Blanca. The ice blocked us at timber-line, and in his parting handclasp I felt the hope and fear of a father who sees his son go away into the world. He appeared to realize that I was not only weak, but that at any moment I might collapse. He knew the heights were steep and stern, and that in the twenty-odd miles to Fort Garland there was neither house nor human being to help me. Apparently he hoped that at the last moment I would change my mind and turn back. Up the northern side of the peak I made my way. Now and then it was necessary to cut a few steps in the ice-plated steeps. The shoulder of the peak across which I was to go was thirteen thousand feet above the sea, and in making the last climb to this it was necessary to choose between a precipitous ice-covered slope and an extremely steep rock-slide,--more correctly a rock glacier. I picked my way up this with the greatest caution. To start a rock avalanche would be easy, for the loose rocks lay insecure on a slope of perilous steepness. From time to time in resting I heard the entire mass settling, snarling, and grinding its way with glacier slowness down the steep. Just beneath the shoulder the tilting steepness of this rocky débris showed all too well that the slightest provocation would set a grinding whirlpool of a stone river madly flowing. The expected at last happened when a boulder upon which I lightly leaped settled and then gave way. The rocks before made haste to get out of the way, while those behind began readjusting themselves. The liveliest of foot-work kept me on top of the now settling, hesitating, and inclined-to-roll boulder. There was nothing substantial upon which to leap. Slowly the heavy boulder settled forward with a roll, now right, now left, with me on top trying to avoid being tumbled into the grinding mill hopper below. At last, on the left, a sliding mass of crushed, macadamized rock offered a possible means of escape. Not daring to risk thrusting a leg into this uncertain mass, I allowed myself to fall easily backwards until my body was almost horizontal, and then face upwards I threw myself off the boulder with all my strength. The rock gave a great plunge, and went bounding down the slope, sending the smaller stuff flying before at each contact with the earth. Though completely relaxed, and with the snowshoes on my back acting as a buffer, the landing was something of a jolt. For a few seconds I lay limp and spread out, and drifted slowly along with the slow-sliding mass of macadam. When this came to rest, I rose up and with the greatest concern for my foundation, made my way upwards, and at last lay down to breathe and rest upon the solid granite shoulder of Sierra Blanca.