[Sidenote: ORIGIN OF KUSSOWLEE RIDGE. _May, 1847._]
A glance at the map will serve to show that the great Himalayan mountain range, dividing the waters of the Sutlej from those of the Jumna, holds a nearly due east and west course in its middle part, but that at its western extremity it bends round to the south, and terminates in the Indian plain, not far from the town of Nahan, and that (among many others) the Kussowlee ridge is a branch from it, running in a north-westerly direction, and separating the waters of the more western branch of the Gambar, from the small tributaries of the Gagar, which find their way to the plains on the left hand.
The ridge upon which the station of Kussowlee is built, nowhere attains an elevation exceeding 7000 feet. It is very narrow, and often rocky and precipitous immediately below the crest on the plainward face, which dips very suddenly. The inner slope is somewhat less abrupt, and is covered from the summit to perhaps 1000 feet below it, with an open forest of a species of fir (_Pinus longifolia_), which, in general appearance and mode of growth, much resembles the Scotch fir, but is distinguished by the very great length of its leaves. The barracks for the troops and the houses of the residents are scattered over the northern slope, or perched on the narrow summit of the ridge.
The shrubby and herbaceous vegetation which occurs scattered among the fir-wood, is so markedly different from that which prevails at the base of the mountains, and during the greater part of the ascent, that the traveller appears suddenly transported into a new world. Instead of those tribes of the vegetable kingdom which abound in the torrid zone, all the forms which now meet the eye are characteristic of a temperate climate. The moderate elevation of the range, and its proximity to the plains, tend to lessen the rapidity of the diminution of temperature; and as the greater part of the ascent lies on a bare sunny slope, the tropical flora extends towards the summit, much farther than it does on ranges which rise higher, and are clothed with shady forest. During the ascent, therefore, the traveller, though often struck with the appearance of new forms, is still accompanied by many species familiar to him as natives of tropical jungles, but on passing to the northern face of the spur, the temperate region is at once entered, and most of the tropical forms disappear.