It is true that, to a traveller approaching the Himalayas from any part of the great plain of India, these mountains present the appearance of a single range, stretching continuously along the horizon from east to west. This, however, is a mere optical illusion; and, instead of one range, the Himalayas may be regarded as a congeries of mountain ridges, covering a superficies of 200,000 square miles, and running in as many different directions as there are points in the compass.
Within the circumference of this vast mountain tract there is great variety of climate, soil, and productions. Among the lower hills—those contiguous to the plains of India—as well as in some of the more profound valleys of the interior—the flora is of a tropical or subtropical character. The palm, the tree fern, and bamboo here flourish in free luxuriance. Higher up appears the vegetation of the temperate zone, represented by forests of gigantic oaks of various species, by sycamores, pines, walnut, and chestnut trees. Still higher are the rhododendrons, the birches, and heaths; succeeded by a region of herbaceous vegetation—by slopes, and even table-plains, covered with rich grasses.

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