The big-horn or mountain sheep, which has a body like the deer, with the head of a sheep, surmounted by an enormous pair of short, heavy horns, is found throughout the Rocky Mountains, and resorts to the most inaccessible peaks and to the wildest and least-frequented glens. It clambers over almost perpendicular cliffs with the greatest ease and celerity, and skips from rock to rock, cropping the tender herbage that grows upon them. It has been supposed by some that this animal leaps down from crag to crag, lighting upon his horns, as an evidence of which it has been advanced that the front part of the horns is often much battered. This I believe to be erroneous, as it is very common to see horns that have no bruises upon them. The old mountaineers say they have often seen the bucks engaged in desperate encounters with their huge horns, which, in striking together, made loud reports. This will account for the marks sometimes seen upon them. The flesh of the big-horn, when fat, is more tender, juicy, and delicious than that of any other animal I know of, but it is a _bon bouche_ which will not grace the tables of our city epicures until a railroad to the Rocky Mountains affords the means of transporting it to a market a thousand miles distant from its haunts. In its habits the mountain sheep greatly resembles the chamois of Switzerland, and it is hunted in the same manner. The hunter traverses the most inaccessible and broken localities, moving along with great caution, as the least unusual noise causes them to flit away like a phantom, and they will be seen no more. The animal is gregarious, but it is seldom that more than eight or ten are found in a flock. When not grazing they seek the sheltered sides of the mountains, and repose among the rocks. [Illustration: THE NEEDLES. Between Cayetano Mountains and the San Juan River--Sierra de la Plata, or Silver Mountains, in the distance.] ITINERARIES. LIST OF ITINERARIES: SHOWING THE DISTANCES BETWEEN CAMPING-PLACES, THE CHARACTER OF THE ROADS, AND THE FACILITIES FOR OBTAINING WOOD, WATER, AND GRASS ON THE PRINCIPAL ROUTES BETWEEN THE MISSISSIPPI RIVER AND THE PACIFIC OCEAN. No. Page I. From Fort Smith, Arkansas, to Santa Fe and Albuquerque, New Mexico. By Captain R. B. Marcy, U.S.A. 257 II. From Fort Leavenworth to Santa Fe, by the way of the upper ferry of the Kansas River and the Cimarron 260 III. Camping-places upon a road discovered and marked out from Fort Smith, Arkansas, to Dona Ana and El Paso, New Mexico, in 1849. By Captain R. B. Marcy, U.S.A. 263 IV. From Leavenworth City to Great Salt Lake City 266 V. From Salt Lake City to Sacramento and Benicia, California 273 VI. From Great Salt Lake City to Los Angeles and San Francisco, California 277