Our long detention here made us thankful for the large tent and the plentiful wood supply. That wood had been hauled twenty miles and raised nearly ten thousand feet, but it was worth while since it enabled us to "weather out the weather" here in warmth and comparative comfort. The wood no more than served our need; indeed, we had begun to economize closely before we left this camp. We were greatly interested and surprised at the intrusion of animal life into these regions totally devoid of any vegetation. A rabbit followed us up the glacier to an elevation of ten thousand feet, gnawing the bark from the willow shoots with which the trail was staked, creeping round the crevasses, and, in one place at least, leaping such a gap. At ten thousand feet he turned back and descended, leaving his tracks plain in the snow. We speculated as to what possible object he could have had, and decided that he was migrating from the valley below, overstocked with rabbits as it was, and had taken a wrong direction for his purpose. Unless the ambition for first ascents have reached the leporidae, this seems the only explanation. At this camp at the head of the glacier we saw ptarmigan on several occasions, and heard their unmistakable cry on several more, and once we felt sure that a covey passed over the ridge above us and descended to the other glacier. It was always in thick weather that these birds were noticed at the glacier head, and we surmised that perhaps they had lost their way in the cloud. But even this was not the greatest height at which bird life was encountered. In the Grand Basin, at sixteen thousand five hundred feet, Walter was certain that he heard the twittering of small birds familiar throughout the winter in Alaska, and this also was in the mist. I have never known the boy make a mistake in such matters, and it is not essentially improbable. Doctor Workman saw a pair of choughs at twenty-one thousand feet, on Nun Kun in the Himalayas. [Sidenote: Avalanches]