Ungovernable energy, rushing down smooth inclines in wide foamy sheets fold over fold, springing up here and there in magnificent whirls, scattering crisp clashing spray for the sunbeams to iris, bursting with hoarse reverberating roar through ragged gorges and boulder dams, booming in falls, gliding, glancing with cool soothing, murmuring...

Our National Parks, Chapter VIII (p. 242), Houghton Mifflin Company. 1901