Mr. Thoreau dedicated his genius with such entire love to the fields, hills and waters of his native town, that he made them known and interesting to all reading Americans, and to people over the sea. The river on whose banks he was born and died he knew from its springs to its confluence with the Merrimack. He had made summer and winter observations on it for many years, and at every hour of the day and night. The result of the recent survey of the Water Commissioners appointed by the State of Massachusetts he had reached by his private experiments, several years earlier. Every fact which occurs in the bed, on the banks, or in the air over it; the fishes, and their spawning and nests, their manners, their food; the shad-flies which fill the air on a certain evening once a year, and which are snapped at by the fishes so ravenously that many of these die of repletion; the conical heaps of small stones on the river-shallows, the huge nests of small fishes, one of which will sometimes overfill a cart; the birds which frequent the stream, heron, duck, sheldrake, loon, osprey; the snake, muskrat, otter, woodchuck and fox, on the banks; the turtle, frog, hyla and cricket, which make the banks vocal,—were were all known to him, and, as it were, townsmen and fellow-creatures; so that he felt an absurdity or violence in any narrative of one of these by itself apart, and still more of its dimensions on an inch-rule, or in the exhibition of its skeleton, or the specimen of a squirrel or a bird in brandy. He liked to speak of the manners of the river, as itself a lawful creature, yet with exactness, and always to an observed fact. As he knew the river, so the ponds in this region.

One of the weapons he used, more important to him than microscope or alcohol-receiver to other investigators, was a whim which grew on him by indulgence, yet appeared in gravest statement, namely, of extolling his own town and neighborhood as the most favored centre for natural observation. He remarked that the Flora of Massachusetts embraced almost all the important plants of America,—most of the oaks, most of the willows, the best pines, the ash, the maple, the beech, the nuts. He returned Kane’s “Arctic Voyage” to a friend of whom he had borrowed it, with the remark, that “Most of the phenomena noted might be observed in Concord.” He seemed a little envious of the Pole, for the coincident sunrise and sunset, or five minutes’ day after six months: a splendid fact, which Annursnuc had never afforded him. He found red snow in one of his walks, and told me that he expected to find yet the Victoria regia in Concord. He was the attorney of the indigenous plants, and owned to a preference of the weeds to the imported plants as of the Indian to the civilized man, and noticed, with pleasure, that the willow beanpoles of his neighbor had grown more than his beans. “See these weeds,” he said, “which have been hoed at by a million farmers all spring and summer, and yet have prevailed, and just now come out triumphant over all lanes, pastures, fields and gardens, such is their vigor. We have insulted them with low names, too,—as Pigweed, Wormwood, Chickweed, Shad-blossom.” He says, “They have brave names, too,—Ambrosia, Stellaria, Amelanchier, Amaranth, etc.”