No two persons in the United States have written with as much passion and power about the bond between human beings and the natural world as Thoreau of WALDEN and Muir of MOUNTAINS OF CALIFORNIA. For both, Native Americans best exemplified the innate need of the human spirit to merge with the primal wilderness. This is the first book to treat together and in depth these two great students of our natural America to explore Native American influence on the development not only of their—but America's—natural philosophies and environmental awareness.