The fifty poems here brought together under the title ‘Poems of Nature’ are perhaps two-thirds of those which Thoreau preserved. Many of them were printed by him, in whole or in part, among his early contributions to Emerson’s Dial, or in his own two volumes, The Week and Walden, which were all that were issued in his lifetime. Others were given to Mr. Sanborn for publication, by Sophia Thoreau, the year after her brother’s death (several appeared in the Boston Commonwealth in 1863); or have been furnished from time to time by Mr. Blake, his literary executor. Most of Thoreau’s poems were composed early in his life, before his twenty-sixth year, - Summary by from Introduction, Henry S. Salt and Frank B. Sanborn,