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servations for his journal as carefully and habitually as he noted the angles and distances in surveying a Concord farm. In all his daily walks and distant journeys, he took notes on the spot of what occurred to him, and these, often very brief and symbolic, he carefully wrote out, as soon as he could get time, in his diary, not classified by topics, but just as they had come to him. To these he added his daily meditations, sometimes expressed in verse, especially in the years between 1837 and 1850, but generally in close and pertinent prose. Many details are found in his diaries, but not such as are common in the diaries of other men,—not trivial but significant details. From these daily entries he made up his essays, his lectures, and his volumes; all being slowly, and with much deliberation and revision, brought into the form in which he gave them to the public. After that he scarcely changed them at all; they had received the last imprint of his mind, and he allowed them to stand and speak for themselves. But before printing, they underwent constant change, by addition, erasure, transposition, correction, and combina-