The Potomac, which forms the boundary between the states of Maryland and Virginia, is navigable to the city of Washington; above which it is obstructed by several falls, of which the most remarkable are _Little Falls_, three miles above Washington, with a descent of thirty-seven feet: _Great Falls_, eight and a half miles further up, with a descent of seventy-six feet; which have been made navigable by means of five locks: _Seneca Falls_, six miles above, descending ten feet: _Shenandoah Falls_, sixty miles higher up the river, where the Potomac breaks through the Blue Ridge at Harper’s Ferry: _Houre’s Falls_, five miles above the Shenandoah. In addition to the cataracts above enumerated, we may notice the _Falling Spring_, in Bath county, Virginia, which forms a beautiful cascade, streaming from a perpendicular precipice, two hundred feet high; and the _Tuccoa Fall_, in Franklin county, Georgia, which, though one of the most beautiful that can be conceived, is scarcely yet known to geographers. It is one hundred and eighty-seven feet in height, and the water is propelled over a perpendicular rock. When the stream is full, it pours over the steep in one expansive magnificent sheet, amid clouds of spray, on which the prismatic colors are reflected with a most enchanting effect. The cascades of the Catskill Mountains are very romantic and beautiful. The Kasterskill is formed by the union of two branches, one rising in two lakes, about one and a half miles east of the western cascade, the other about half the distance in a northerly direction. The best view of the western fall is from below, the foliage above being so thick as in a great measure to obscure it. Below the fall the banks of the stream, which are nearly three hundred feet in height, rise almost perpendicularly from the surface of the water. The following description is from the pen of Mr. H. E. Dwight.