Next morning we crossed the low pass and dropped down easily into the wide valley of the Koyukuk South Fork, with a fine prospect of mountains everywhere as far as the eye could see. I had stood and gazed upon those same mountains on my journey of the previous winter, my first winter in Alaska, and had seen a most remarkable sight. As we began the descent and a turn of the trail gave a new panorama of peaks I did not at first realise the nature of the peculiar phenomenon I was gazing at. Each peak had a fine, filmy, fan-shaped cloud stretching straight out from it into the sky, waving and shimmering as it stretched. The sun was not above the horizon, but his rays caught these sheer, lawn-like streamers and played upon them with a most delicate opalescent radiance. Then all at once came to my mind the recollection of a description in John Muir's _Mountains of California_ (surely the finest mountain book ever written) of the snow banners of the Sierra Nevada, and I knew that I was looking at a similar spectacle. It meant that a storm was raging on high, although so far we were sheltered from it. It meant that the dry, sand-like snow of the mountain flanks was driven up those flanks so fiercely before the wind that it was carried clean over them and beyond them out into the sky, and still had such pressure behind it that it continued its course and spread out horizontally, thinning and spreading for maybe a mile before it lost all coherence and visibility. As far as I could see mountain peaks I could see the snow banners, all pointing one way, all waving, all luminous and shimmering in the sun-rays. It was a very noble sight, and I gazed a long while entranced, not knowing how ominous it was. When we reached the valley and left the shelter of the gulch we struck the full force of that fearful gale, and for two days and nights of incessant blizzard we lay in a hole dug out of a sand-bank (for we had no tent that year), the trail lost, the grub box nearly empty, and no fire possible to cook anything with had the grub box been full. The valley before us--to resume the narrative--is a high, wind-swept region of niggerhead and swamp, the catch-basin of the South Fork of the Koyukuk River. The trail descends one of its southern draws, follows up the main valley awhile, crosses it, and leaves by one of its northern draws to pass over the mountains that separate its drainage from the main fork of the Koyukuk. The cold had given place to wind, and though the gale did not approach the fierceness of last year's storm, it gave great trouble in following the track. These high headwater basins are always windy; the timber is scrubby spruce with many open places, and in such open places the trail is soon obliterated altogether.