Note 1 — The Gatherer.

Footnote 1

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It may be as well here to quote the formation of Cataracts and Cascades, from Maltebrun's valuable System of Universal Geography. "It is only the sloping of the land which can at first cause water to flow; but an impulse having been once communicated to the mass, the pressure alone of the water will keep it in motion, even if there were no declivity at all. Many great rivers, in fact, flow with an almost interruptible declivity. Rivers which descend from primitive mountains into secondary lands, often form cascades and cataracts. Such are the cataracts of the Nile, of the Ganges, and some other great rivers, which, according to Desmarest, evidently mark the limits of the ancient land. Cataracts are also formed by lakes: of this description are the celebrated Falls of the Niagara; but the most picturesque falls are those of rapid rivers, bordered by trees and precipitous rocks. Sometimes we see a body of water, which, before it arrives at the bottom, is broken and dissipated into showers, like the Staubbach, (see Mirror, vol. xiv. p. 385.); sometimes it forms a watery arch, projected from a rampart of rock, under which the traveller may pass dryshod, as the "falling spring" of Virginia; in one place, in a granite district, we see the Trolhetta, and the Rhine not far from its source, urge on their foaming billows among the pointed rocks; in another, amidst lands of a calcareous formation, we see the Czettina and the Kerka, rolling down from terrace to terrace, and presenting sometimes a sheet, and sometimes a wall, of water. Some magnificent cascades have been formed, at least in part, by the hands of man: the cascades of Velino, near Terni, have been attributed to Pope Clement VIII.; other cataracts, like those of Tunguska, in Siberia, have gradually lost their elevation by the wearing away of the rocks, and have now only a rapid descent."—Maltebrun, vol. i.