"The southern portion of Montana Territory is mild; and from the testimony of explorers and settlers, as well as from my own experience and observation, the extreme northern portion is favored by a climate healthful to a high degree, and quite as mild as that of many of the Northern and Western States. This is particularly the case west of the mountains, in accordance with the well-known fact, that the isothermal line, or the line of heat, is farther north as you go westward from the Eastern States toward the Pacific. "At Fort Benton [one hundred and thirty miles directly north from Gallatin], in about 48 deg. of north latitude, a trading post of the American Fur Company, their horses and cattle, of which they have large numbers, are never housed or fed in winter, but get their own living without difficulty.... "Northeastern Montana is traversed by the Yellow Stone, whose source is high up in the mountains, from thence winding its way eastward across the Territory and flowing into the Missouri at Fort Union; thus crossing seven degrees of longitude, with many tributaries flowing into it from the south, in whose valleys, in connection with that of the Yellow Stone, there are hundreds of thousands of acres of tillable land, to say nothing of the tributaries of the Missouri, among which are the Jefferson, Madison, and Gallatin forks, along which settlements are springing up, and agriculture is becoming a lucrative business. These valleys are inviting to the settler. They are surrounded with hills and mountains, clad with pine, while a growth of cotton-wood skirts the meandering streams that everywhere flow through them, affording abundance of water-power. "The first attempt at farming was made in the summer of 1863, which was a success, and indicates the productiveness of these valleys. Messrs. Wilson and Company broke thirty acres last spring, planting twelve acres of potatoes,--also corn, turnips, and a variety of garden sauce, all of which did well. The potatoes, they informed me, yielded two hundred bushels per acre, and sold in Virginia City, fifty miles distant, at twenty-five cents per pound, turnips at twenty cents, onions at forty cents, cabbage at sixty cents, peas and beans at fifty cents per pound in the pod, and corn at two dollars a dozen ears. Vines of all kinds seem to flourish; and we see no reason why fruit may not be grown here, as the climate is much more mild than in many of the States where it is a staple. "The valley at the Three Forks, as also the valley along the streams, as they recede from the junction, are spacious, and yield a spontaneous growth of herbage, upon which cattle fatten during the winter....