It was a pleasure and a privilege to walk with him. He knew the country like a fox or a bird, and passed through it as freely by paths of his own. He knew every track in the snow or on the ground, and what creature had taken this path before him. One must submit abjectly to such a guide, and the reward was great. Under his arm he carried an old music-book to press plants; in his pocket, his diary and pencil, a spy-glass for birds, microscope, jack-knife, and twine. He wore a straw hat, stout shoes, strong gray trousers, to brave scrub-oaks and smilax, and to climb a tree for a hawk’s or a squirrel’s nest. He waded into the pool for the water-plants, and his strong legs were no insignificant part of his armor. On the day I speak of he looked for the Menyanthes, detected it across the wide pool, and, on examination of the florets, decided that it had been in flower five days. He drew out of his breast-pocket his diary, and read the names of all the plants that should bloom on this day, whereof he kept account as a banker when his notes fall due. The Cypripedium not due till to-morrow. He thought that, if waked up from a trance, in this swamp, he could tell by the plants what time of the year it was within two days. The redstart was flying about, and presently the fine grosbeaks, whose brilliant scarlet “makes the rash gazer wipe his eye,” and whose fine clear note Thoreau compared to that of a tanager which has got rid of its hoarseness. Presently he heard a note which he called that of the night-warbler, a bird he had never identified, had been in search of twelve years, which always, when he saw it, was in the act of diving down into a tree or bush, and which it was vain to seek; the only bird which sings indifferently by night and by day. I told him he must beware of finding and booking it, lest life should have nothing more to show him. He said, “What you seek in vain for, half your life, one day you come full upon, all the family at dinner. You seek it like a dream, and as soon as you find it you become its prey.”