This compilation of Clarence Glacken’s ‘lost works’ is an invaluable gift. It is a brilliant treatment of some of the most important environmental thinkers of the last two centuries, and Glacken provides new and fresh insights even into thinkers such as Darwin, about whom so much has been written. This important work holds appeal not only for geographers, historians, and ecologists but also for anyone interested in the environment, science, and intellectual history.–Diana K. Davis, University of California, Davis, author of The Arid Lands: History, Power, Knowledge.