Tungu occupies a very broad valley, at the junction of the Tungu-choo from the east, and the Lachen from the north. The hills slope gently upwards to 16,000 feet, at an average angle of 15 degrees; they are flat and grassy at the base, and no snow is anywhere to be seen.* [In the wood-cut the summit of Chomiomo is introduced, as it appears from a few hundred feet above the point of view.] A stupendous rock, about fifty feet high, lay in the middle of the valley, broken in two: it may have been detached from a cliff, or have been transported thither as part of an ancient moraine which extends from the mouth of the Tungu-choo valley across that of the Lachen. The appearance and position of this great block, and of the smaller piece lying beside it, rather suggest the idea of the whole mass having fallen perpendicularly from a great height through a crevasse in a glacier, than of its having been hurled from so considerable a distance as from the cliffs on the flanks of the valley: it is faithfully represented in the accompanying woodcut. A few wooden houses were collected near this rock, and several black tents were scattered about. I encamped at an elevation of 12,750 feet, and was waited on by the Lachen Phipun with presents of milk, butter, yak-flesh, and curds; and we were not long before we drowned old enmity in buttered and salted tea. On my arrival I found the villagers in a meadow, all squatted cross-legged in a circle, smoking their brass and iron pipes, drinking tea, and listening to a letter from the Rajah, concerning their treatment of me. Whilst my men were pitching my tent, I gathered forty plants new to me, all of Tartarian types.* [More Siberian plants appeared, as _Astragali, Chenopodium, Artemisia,_ some grasses, new kinds of _Pedicularis, Delphinium,_ and some small Orchids. Three species of _Parnassia_ and six primroses made the turf gay, mixed with saxifrages, _Androsace_ and _Campanula._ By the cottages was abundance of shepherd's-purse, _Lepidium,_ and balsams, with dock, _Galeopsis,_ and _Cuscuta._ Several low dwarf species of honeysuckle formed stunted bushes like heather; and _Anisodus,_ a curious plant allied to _Hyoscyamus,_ whose leaves are greedily eaten by yaks, was very common.] Wheat or barley I was assured had been cultivated at Tungu when it was possessed by Tibetans, and inhabited by a frontier guard, but I saw no appearance of any cultivation. The fact is an important one, as barley requires a mean summer temperature of 48 degrees to come to maturity. According to my observations, the mean temperature of Tungu in July is upwards of 50 degrees, and, by calculation, that of the three summer months, June, July, and August, should be about 46.5 degrees. As, however, I do not know whether these cerealia were grown as productive crops, much stress cannot be laid upon the fact of their having been cultivated, for in a great many parts of Tibet the barley is annually cut green for fodder.