Ascending from the lakes to the Chog La we saw a small black rat amongst the huge boulders of a moraine; it appeared to be a very active little animal, and though four or five were seen at different times in similar situations we failed to secure a specimen. Near the Chog La we found the snow-partridge (_Lerwa lerwa_), and one was shot out of a flock of very beautiful blue birds--Hodgson's grandala. Another very handsome bird in this region is the red-breasted rose-finch, which is found up to 18,000 feet. Descending from the Chog La towards the Kama Valley we found at 16,000 feet the giant rhubarb (_Rheum nobile_), and at 14,000 feet we picked quantities of the wild edible rhubarb. A little lower down we came to large blue scabius, 3 to 4 feet high, a dark blue monkshood and quantities of the tall yellow poppy. Rhododendrons, birches and junipers begin at about 13,500 feet, and at 12,000 feet the junipers are the predominating tree; they are of immense size, upwards of 20 feet in girth and from 120 to 150 feet in height and of a very even and perfect growth. Here we met with the Sikkim black tit (_Parus beavani_), and a little lower down among the firs (_Abies webbiana_) we came upon bullfinches (_Pyrrhula erythrocephala_). At 11,000 feet I saw a langur monkey (_Semnopithecus entellus_), the only monkey I saw in Tibet. Excepting one solitary bat, the only other mammal we saw in this valley was another species of pika (_Ochotona roylei nepalensis_), which appears here to be confined to a zone between the altitudes of 12,000 and 14,000 feet; it is not found in dry valleys. Among the trees in the lower Kama Valley grow many parnassias, a tall green fritillaria, a handsome red swertia and a very sweet-scented pink orchis. We found the tubers (but not the flowers) of an arum, which the Tibetans collect and make of it a very unpalatable bread. We went down through large rhododendrons, magnolias, bamboos, alders, sycamores, all draped in long wisps of lichen (_Usnea_), to the junction of the Kama with the Arun River, where we found ourselves in the region of the blue pine. The lower part of the Kama Valley is unpleasantly full of leeches, and in the course of an excursion to the Popti La (14,000 feet), one of the principal passes from Tibet to Sikkim, we were astonished to find them very numerous and active at an altitude of 12,000 feet. At our low-altitude camps in this valley hundreds of moths were attracted by the light of our camp fire, and a few came to the dim candle lamps in our tents. A collector who came here with a proper equipment could not fail to make a large collection of moths. [Illustration: FOREST IN THE KAMA VALLEY.]