Almost all agriculture in Utah is carried on by the aid of irrigation. From April till October hardly a shower falls upon the soil, which parches and cracks in the hot sunshine. The settlements are all at the base of the mountains, where they can take advantage of the brooks that leap down through the cañons. They are, therefore, necessarily scattered along the line of the main Wahsatch range, from the Roseaux River, which flows into the Salt Lake from the north, to the Vegas of the Santa Clara,--a distance of nearly four hundred miles. The labor expended in ditching has been immense, but it has been confined wholly to tapping the smaller streams. By damming the Jordan in Salt Lake Valley and the Sevier in Parawan Valley, and distributing their water over the broad bottom-lands, on which the only vegetation now is wild sage and greasewood, the area of arable ground might be quintupled; and any considerable increase of population will render such an undertaking indispensable; for the narrow strip which is fertilized by the mountain-brooks yields scarcely more than enough to supply the present number of inhabitants. Nowhere does it exceed two or three miles in breadth, except along the eastern shore of Lake Utah, where it extends from the base of the mountains to the verge of the lake. Almost all cereals and vegetables attain the utmost perfection, rivalling the most luxuriant productions of California. Within the last few years the cultivation of the Chinese sugar-cane has been introduced, and has proved successful. In Salt Lake City considerable attention is paid to horticulture. Peaches, apples, and grapes grow to great size, at the same time retaining excellent flavor. The grape which is most common is that of the vineyards of Los Angeles. In the vicinity of Provo an attempt has been made to cultivate the tea-plant; and on the Santa Clara several hundred acres have been devoted to the culture of cotton, but with imperfect success. Flax, however, is raised in considerable quantity. The fields are rarely fenced with rails, and almost never with stones. The dirt-walls by which they are usually surrounded are built by driving four posts into the ground, which support a case, ten or twelve feet in length, made of boards. This is packed full of mud, which dries rapidly in the intense heat of a summer noon. When it is sufficiently dry to stand without crumbling, the posts are moved farther along and the same operation is repeated.