In this months This Old Tree host Doug Still explores Thoreau's Concord Elm. Concord, Massachusetts, 1856. Four men cut down a huge, seemingly healthy American elm tree using block and tackle, and ropes drawn by a horse. The graceful tree towered above a house whose owners heard creaking during a storm - they felt unsafe and had it removed. The event would have been long forgotten, except one of America’s greatest writers and earliest environmentalists also lived in Concord - Henry David Thoreau. Supremely ticked-off, the removal of the stately elm inspired a flurry of journal writing by Thoreau that defined elms as symbols of virtue that looked to Concord’s past and the country’s future. Guest Thomas Campanella, Professor at Cornell University and author of Republic of Shade: New England and the American Elm, shares his work. It turns out, elm trees  helped define our young nation’s sense of itself.