As we went down the ridge upon which stands Dad Joe's Grove, we saw many boulders of rock lying on the surface of the soil of the prairies. The western people, naturally puzzled to tell how they came there, give them the expressive name of "lost rocks." We entered a forest of scattered oaks, and after travelling for half an hour reached the Winnebago Swamp, a tract covered with tall and luxuriant water-grass, which we crossed on a causey built by a settler who keeps a toll-gate, and at the end of the causey we forded a small stream called Winnebago Inlet. Crossing another vast prairie we reached the neighborhood of Dixon, the approach to which was denoted by groves, farm-houses, herds of cattle, and inclosed corn fields, checkering the broad green prairie. Dixon, named after an ancient settler of the place still living, is a country town situated on a high bank of Rock River. Five years ago two log-cabins only stood on the solitary shore, and now it is a considerable village, with many neat dwellings, a commodious court-house, several places of worship for the good people, and a jail for the rogues, built with a triple wall of massive logs, but I was glad to see that it had no inmate. Rock River flows through high prairies, and not, like most streams of the West, through an alluvial country. The current is rapid, and the pellucid waters glide over a bottom of sand and pebbles. Its admirers declare that its shores unite the beauties of the Hudson and of the Connecticut. The banks on either side are high and bold; sometimes they are perpendicular precipices, the base of which stands in the running water; sometimes they are steep grassy or rocky bluffs, with a space of dry alluvial land between them and the stream; sometimes they rise by a gradual and easy ascent to the general level of the region, and sometimes this ascent is interrupted by a broad natural terrace. Majestic trees grow solitary or in clumps on the grassy acclivities, or scattered in natural parks along the lower lands upon the river, or in thick groves along the edge of the high country. Back of the bluffs, extends a fine agricultural region, rich prairies with an undulating surface, interspersed with groves. At the foot of the bluffs break forth copious springs of clear water, which hasten in little brooks to the river. In a drive which I took up the left bank of the river, I saw three of these in the space of as many miles. One of these is the spring which supplies the town of Dixon with water; the next is a beautiful fountain rushing out from the rocks in the midst of a clump of trees, as merrily and in as great a hurry as a boy let out of school; the third is so remarkable as to have received a name. It is a little rivulet issuing from a cavern six or seven feet high, and about twenty from the entrance to the further end, at the foot of a perpendicular precipice covered with forest-trees and fringed with bushes.