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Rh rocks and sunken logs which made river traveling, especially on swift streams, difficult and dangerous.

Nor have our rivers always held the position in respect to size which they relatively hold today. It is doubtful if one who knew the old Monongahela would recognize the placid, turbid, faithful river which bears that name today. As though these streams of ours recognize in some way that they must needs conform to the state of civilization which they see about them, and may not run wild and free as when amenable only to the caprice of savage aborigines! Of course the greater difference would be discoverable in such rivers as have been bound in locks and dams, and deepened by the dredge. Such was the rapidity of the current of many of our streams that the time now made by swift packets is more than double the time taken by canoes before slack-water navigation was introduced. With the damming of these streams, local history, in all our states, has lost many landmarks well known in the earliest days of navigation. On the Allegheny river, as on the Susquehanna