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 many plants which do not occur in Sikhim, where every valley and hill has been thoroughly explored. The following day I continued my journey up the valley, and camped at Lung, passing en route the Guru Lhakhang, a very old building, surrounded by ancient poplars, but in itself uninteresting. On this march I discovered that the main stream of the Monass takes its rise in the great amphitheatre of snow-mountains, averaging 24,000 feet in height, round Kulu-Kangri. It rises from some large glaciers, and is exceedingly muddy, the water a thick yellowish-red colour. At Lyateoh, where my transport was changed, the main valley turned to the west, although the river containing by far the most water came in from the south. The quantity of silt brought down is very great, and shows what enormous disintegration is in progress. I was particularly struck by the number of ruined villages I passed on this march.

In the hills round Lung there is some fine ovis ammon ground, and I saw several large flocks. They were extraordinarily tame, and allowed me to walk, across the open, to within thirty or forty yards, and then only moved slowly away. I first saw them from my bed. I awoke early, and on looking out I saw eight grazing on the hillside not half a mile away. They have never been shot at, which accounts for their tameness.

A path from Lung, used by yaks and their drivers, leads over the snow to the head-waters of the branches of the Mo-chhu, and is said not to be a very difficult one. My route, however, took me up the valley and over the Ta-la Pass (17,900 feet), the watershed between India and the Pho-mo-chang-thang Lake basin, which has no outlet, then along high, rolling downs, and, after passing three small lakes, came to the large plain at the head of the Pho-mo-chang-thang Lake itself. The lake appears to be receding to a certain extent, and I think probably this is chiefly owing to the large quantities of silt brought