_Sept. 18._--How the summer-time flits away, even while it seems to be loitering onward, arm in arm with autumn! Of late I have walked but little over the hills and through the woods, my leisure being chiefly occupied with my boat, which I have now learned to manage with tolerable skill. Yesterday afternoon I made a voyage alone up the North Branch of Concord River. There was a strong west wind blowing dead against me, which, together with the current, increased by the height of the water, made the first part of the passage pretty toilsome. The black river was all dimpled over with little eddies and whirlpools; and the breeze, moreover, caused the billows to beat against the bow of the boat, with a sound like the flapping of a bird's wing. The water-weeds, where they were discernible through the tawny water, were straight outstretched by the force of the current, looking as if they were forced to hold on to their roots with all their might. If for a moment I desisted from paddling, the head of the boat was swept round by the combined might of wind and tide. However, I toiled onward stoutly, and, entering the North Branch, soon found myself floating quietly along a tranquil stream, sheltered from the breeze by the woods and a lofty hill. The current, likewise, lingered along so gently that it was merely a pleasure to propel the boat against it. I never could have conceived that there was so beautiful a river-scene in Concord as this of the North Branch. The stream flows through the midmost privacy and deepest heart of a wood, which, as if but half satisfied with its presence, calm, gentle, and unobtrusive as it is, seems to crowd upon it, and barely to allow it passage; for the trees are rooted on the very verge of the water, and dip their pendent branches into it. On one side there is a high bank, forming the side of a hill, the Indian name of which I have forgotten, though Mr. Thoreau told it to me; and here, in some instances, the trees stand leaning over the river, stretching out their arms as if about to plunge in headlong. On the other side, the bank is almost on a level with the water; and there the quiet congregation of trees stood with feet in the flood, and fringed with foliage down to its very surface. Vines here and there twine themselves about bushes or aspens or alder-trees, and hang their clusters (though scanty and infrequent this season) so that I can reach them from my boat. I scarcely remember a scene of more complete and lovely seclusion than the passage of the river through this wood. Even an Indian canoe, in olden times, could not have floated onward in deeper solitude than my boat. I have never elsewhere had such an opportunity to observe how much more beautiful reflection is than what we call reality. The sky, and the clustering foliage on either hand, and the effect of sunlight as it found its way through the shade, giving lightsome hues in contrast with the quiet