Here the Kuti River ran through a large basin, not dissimilar to the one near which we had camped the night before, having also the appearance of lake formation with high perpendicular rocks on the left, which gave one the impression of a vast wall--a rugged and forbidding barrier. Proceeding N.W. the basin became wider and the Kuti River turned to the N.W., while the Mangshan River, descending from the East, joined the first stream in the centre of the basin. In crossing the numerous branches of the two rivers we again experienced, with almost accentuated discomfort, the trials and weariness of the preceding day. The water was colder than ever, our feet were by this time in a dreadful condition, cut and bleeding, because it was constantly necessary to walk bare-footed. Aching and benumbed we stumbled on, in and out of water, always, it seemed, encountering sharp small stones. For us there could be no turning back however; the pain had to be borne before the march was finished, and we won our camping-ground at last under the lee of the high chain of mountains to the North of us, and on the northern bank of the Mangshan River. Directly in front stood the final obstacle, the stupendous backbone of the Himahlyas; once past this I should be on that high Tibetan plateau so accurately and picturesquely called "the roof of the world." [12] N.B.--This same kind of butterfly I found at even greater elevations in Tibet. CHAPTER XXIII The scouts return--A small exploring party--The Mangshan glacier.