A natural skill for mensuration, growing out of his mathematical knowledge and his habit of ascertaining the measures and distances of objects which interested him, the size of trees, the depth and extent of ponds and rivers, the height of mountains, and the air-line distance of his favorite summits,—this, and his intimate knowledge of the territory about Concord, made him drift into the profession of land-surveyor. It had the advantage for him that it led him continually into new and secluded grounds, and helped his studies of Nature. His accuracy and skill in this work were readily appreciated, and he found all the employment he wanted.

He could easily solve the problems of the surveyor, but he was daily beset with graver questions, which he manfully confronted. He interrogated every custom, and wished to settle all his practice on an ideal foundation. He was a protestant à outrance, and few lives contain so many renunciations. He was bred to no profession; he never married; he lived alone; he never went to church; he never voted; he refused to pay a tax to the State; he ate no flesh, he drank no wine, he never knew the use of tobacco; and, though a naturalist, he used neither trap nor gun. He chose, wisely no doubt for himself, to be the bachelor of thought and Nature. He had no talent for wealth, and knew how to be poor without the least hint of squalor or inelegance. Perhaps he fell into his way of living without forecasting it much, but approved it with later wisdom. “I am often reminded,” he wrote in his journal, “that if I had bestowed on me the wealth of Croesus, my aims must be still the same, and my means essentially the same.” He had no temptations to fight against,—no appetites, no passions, no taste for elegant trifles. A fine house, dress, the manners and talk of highly cultivated people were all thrown away on him. He much preferred a good Indian, and considered these refinements as impediments to conversation, wishing to meet his companion on the simplest terms. He declined invitations to dinner-parties, because there each was in every one’s way, and he could not meet the individuals to any purpose. “They make their pride,” he said, “in making their dinner cost much; I make my pride in making my dinner cost little.” When asked at table what dish he preferred, he answered, “The nearest.” He did not like the taste of wine, and never had a vice in his life. He said,—“I have a faint recollection of pleasure derived from smoking dried lily-stems, before I was a man. I had commonly a supply of these. I have never smoked anything more noxious.”