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Rock river, a large navigable stream which rises near Lake Winnebago in Fond du Lac county and running in a southerly direction empties into the Mississippi in the state of Illinois one hundred and sixty two [fifty[ miles below the state line. It derives its name from some rocks near the mouth seen in passing on the Mississippi, and not from its being more rocky than any other of the western rivers. The "Rock river country" is very favorably known for its fertility of soil and the beauty of its natural scenery; and the numerous remains of an ancient people and of their works found in its vicinity, indicate that this celibrity is not of recent date. It may with but moderate expense be made navigable for small steam boats from the junction of Doty's river, only eighteen from Lake Winnebago, to its mouth, being nearly three hundred miles. Hustis Rapids and Johnson's rapids are the principal obstructions in this Territory; and the estimated cost of the necessary improvements within

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