"The usual walk (through this deep cave open at the top) is about half a mile in length, and its almost subterranean river, in that distance, plunges over four precipices in exceedingly beautiful cascades. On the successive rocky terraces between the falls, the torrent takes every variety of rapids and whirlpools, and, perhaps, in all the scenery of the world, there is no river, which, in the same space, presents so many of the various shapes and beauties of running and falling water. The Indian name of the stream (the Kanata, which means the _amber river_) expresses one of its peculiarities, and, probably from the depth of shade cast by the two dark and overhanging walls 'twixt which it flows, the water is everywhere of a peculiarly rich lustre and color, and, in the edges of one or two of the cascades, as yellow as gold. Artists, in drawing this river, fail, somehow, in giving the impression of _deep-down-itude_ which is produced by the close approach of the two lofty walls of rock, capped by the overleaning woods, and with the sky apparently resting, like a ceiling, upon the leafy architraves.... If there were truly, as the poets say figuratively, "worlds _within_ worlds," this would look as if an earthquake had cracked open the outer globe, and exposed, through the yawning fissure, one of the rivers of the globe below--the usual underground level of "down among the dead men," being, as you walk upon its banks, between you and the daylight. "Considering the amount of surprise and pleasure which one feels in a walk up the ravine at Trenton, it is remarkable how little one finds to say about it, the day after. Is it that mere scenery, without history, is enjoyable without being suggestive, or, amid the tumult of the rushing torrent at one's feet, is the milk of thought too much agitated for the cream to rise? I fancied yesterday, as I rested on the softest rock I could find at the upper end of the ravine, that I should tumble you out a letter to-day, with ideas pitching forth like saw-logs over a waterfall; but my memory has nothing in it to-day but the rocks and rapids it took in--the talent wrapped in its napkin of delight remaining in unimproved _statu-quo_-sity. One certainly gets the impression, while the sight and hearing are so overwhelmed, that one's mind is famously at work, and that we shall hear from it to-morrow; but it is Jean Paul, I think, who says that 'the mill makes the most noise when there is no grist in the hopper.'