Thoreau's 150th death anniversary marked in Mass.

CONCORD, Mass. (AP) - Members of the oldest and largest organizations devoted to the legacy of Henry David Thoreau are celebrating the passage of 150 years since the author and naturalist died in Massachusetts.

Members of the Thoreau Society gathered in Concord on Saturday for the third day of their annual gathering. The event, scheduled to end Sunday, features nature walks, workshops and a keynote speech by two-time Pulitzer Prize winner Edward Wilson.

Thoreau, who lived from 1817 to 1862, is well-known for his reflections on simple living in nature, especially through his book "Walden," about his two-year retreat in a small house on Walden Pond in his hometown of Concord. He also wrote "The Maine Woods," a lesser-known book about his observations and thoughts during his three journeys to northern Maine in 1846, 1853 and 1857.