Leaving, then, the new world, let us cast a glance, in company with one of the greatest botanists of the day, at what we may call the tropical features of the Sikkim Himalayas. Though this region is not strictly speaking within the tropics, yet the vegetation at the base is of a tropical character. In this wonderful district the naturalist is able to wander through every zone of vegetation, from the "dense deep-green dripping forests" at the base of the Himalaya, formed of giant trees, as the _Duabanga_ and _Terminalia_, with _Cedrela_ and _Gordonia Wallichii_, mingled with innumerable shrubs and herbs, to the lichens and mosses of the regions of perpetual snow. The tropical vegetation of the Sikkim extends from Siligoree, a station on the verge of the Terai, "that low malarious belt which skirts the base of the Himalaya from the Sutlej to Brahma-Koond, in Upper Assam." "Every feature," writes Dr. Hooker, "botanical, geological, and zoological, is new on entering this district. The change is sudden and immediate: sea and shore are hardly more conspicuously different; nor from the edge of the Terai to the limit of perpetual snow is any botanical region more clearly marked than this which is the commencement of Himalayan vegetation." The banks of the numerous tortuous streams are richly clothed with vines and climbing convolvuluses, with various kinds of _Cucurbitaceae_ and _Bignoniaceae_. The district of the Terai is very pestilential, and, though fatal to Europeans, is inhabited by a race called the Mechis with impunity. As our traveller proceeded to the little bungalow of Punkabaree, about 1,800 feet in elevation, the bushy timber of the Terai was found to be replaced by giant forests, with large bamboos cresting the hills, numerous epiphytical orchids and ferns, with _Hoya, Seitamineae_, and similar types of the hottest and dampest climates. All around Punkabaree the hills rise steeply 5,000 or 6,000 feet; from the road at and a little above the bungalow the view is described by Dr. Hooker as superb and very instructive: