As a unique feature, the Third Edition includes generous excerpts from Thoreau's journal, reprinted by special arrangements with Princeton University Press from the definitive edition of his writings. Spanning the years 1845-54, these selections vividly display Thoreau's intensive exploration of his local landscape; the fusion of literary and natural history field work that informs Walden, "Walking," and "Wild Apples"; and the growth of his environmental imagination.
"Reviews and Posthumous Assessments" for this edition collects eight new reviews of Thoreau's antislavery and late environmental essays as well as of Walden. To the influential portraits of Thoreau by Ralph Waldo Emerson and James Russell Lowell, the Third Edition adds John Burroughs's "Another Word on Thoreau," his response to them and to his great predecessor.
"Recent Criticism" includes eighteen selections of the best historical, political, philosophical, poststructuralist, and environmental criticism of Thoreau's writing since the mid-twentieth century. To classic pieces by E. B. White, Leo Marx, Barbara Johnson, and Stanley Cavell, the Third Edition adds essays by nine new contributors, among them Laurence Buell, Laura Dassow Walls, Evan Carton, Robert A. Gross, Albert J. von Frank, Steven Fink, and William Rossi.
A Chronology of Thoreau's life and work, new to the Third Edition, and an expanded and updated Selected Bibliography are also included.

Henry David Thoreau spent almost his entire life in the village of Concord, Massachusetts, where he was born in 1817. After graduating from Harvard College in 1837, he developed a deep friendship with the writer and philosopher Ralph Waldo Emerson, the foremost figure in the Transcendentalist movement. Emerson's emphasis on the cultivation of intuition and experience as keys to personal and social enlightenment profoundly influenced Thoreau. In 1845, Thoreau built a small cabin on a parcel of land Emerson owned near Walden Pond, where he lived for most of two years, seeking a new relationship to nature, society, and his own self. His experiences there are the raw material of his masterpiece, Walden, or Life in the Woods. Although he was first and last a writer and outdoorsman, Thoreau worked as a surveyor and handyman and was an active abolitionist and opponent of war and imperialism. He died in 1862 of tuberculosis.