He understood the matter in hand at a glance, and saw the limitations and poverty of those he talked with, so that nothing seemed concealed from such terrible eyes. I have repeatedly known young men of sensibility converted in a moment to the belief that this was the man they were in search of, the man of men, who could tell them all they should do. His own dealing with them was never affectionate, but superior, didactic,--scorning their petty ways,--very slowly conceding, or not conceding at all, the promise of his society at their houses, or even at his own. "Would he not walk with them?" He did not know. There was nothing so important to him as his walk; he had no walks to throw away on company. Visits were offered him from respectful parties, but he declined them. Admiring friends offered to carry him at their own cost to the Yellow-Stone River,--to the West Indies,--to South America. But though nothing could be more grave or considered than his refusals, they remind one in quite new relations of that fop Brummel's reply to the gentleman who offered him his carriage in a shower, "But where will _you_ ride, then?"--and what accusing silences, and what searching and irresistible speeches, battering down all defences, his companions can remember! 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 the 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, one of which heaps will sometimes overfill a cart,--these heaps the huge nests of small fishes; 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 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.