"The great valley of the Sacramento and San Joaquin has evidently been, at some remote period, the bed of a lake; and those rivers, which drain it, present the appearance of having cut their channels through the alluvial deposit after it had been formed. In fact, it is not possible that they could have been instrumental in forming the plain through which they pass. Their head-waters come from the extreme ends of the valley, north and south; and, were it not for the supply of water received from the streams which flow into them from the Sierra Nevada, their beds would be almost, if not quite, dry in the summer months. The soil is very rich, and, with a proper system of drainage and embankment, would, undoubtedly, be capable of producing any crop, except sugar-cane, now cultivated in the Atlantic States of the Union. "There are many beautiful valleys and rich hill-sides among the foot-hills of the Sierra Nevada, which, when the profits of labor in mining shall be reduced so as to cause its application to agriculture, will probably support a large population. There is said to be a rich belt of well-timbered and watered country extending the whole length of the gold region between it and the Sierra Nevada, some twenty miles in width. There is no information sufficiently accurate respecting the eastern slope of the great snowy range to enable us to form any opinion of its general character or soil. Some of its valleys have been visited by miners, who represent them as equal to any portion of the country to the westward of it. "The great valley of the Colorado, situated between the Sierra Madre and the Sierra Nevada, is but little known. It is inhabited by numerous tribes of savages, who manifest the most decided hostility towards the whites, and have hitherto prevented any explorations of their country, and do not permit emigrants to pass through it. Therefore, parties from Santa Fé, on their way to California, are compelled to make a circuit of near a thousand miles northward to the Salt Lake, or about the same distance southward by the route of the Gila. Although this valley is little known, there are indications that it is fertile and valuable. "The name of the river 'Colorado' is descriptive of its waters; they are as deeply colored as those of the Missouri or Red River, while those of the Gila, which we know flows through barren lands, are clear.