Henry David Thoreau wrote several of our classics in prose, notably "Walden" --- his journal of living in the woods at Walden Pond (1854) --- and his essay on "Civil Disobedience" (1849). Emerson wrote of Thoreau in his journals: "It was a pleasure to
know him 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." Thoreau lived in
an intimate relation with the birds and the flowers. When Thoreau and Emerson walked together one day (the latter wrote), "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."
When Thoreau heard the "night-warbler," having searched for it in vain for twelve years, he told Emerson, "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"