The Untilled Garden: Natural History and the Spirit of Conservation in America, 1740-1840This study traces the origins of conservation thinking in America to the naturalists who explored the middle western frontier between 1740 and 1840. Their inquiries yielded a comprehensive natural history of America and inspired much of the conservation and ecological thinking we associate with later environmental and ecological philosophy. These explorers witnessed one of the great environmental transformations in American history, as the vast