The tallest species of spruce, hemlock, fir, cedar, and pine trees on earth coexist in the old growth of the H. J. Andrews Experimental Forest in Oregon's Cascade Range. Set aside as a living laboratory by the U.S. Forest Service in 1948, the 16,000 acres represent a vital scientific endeavor: the long-term study of a single contained ecosystem. Here, for the first time, researchers from an enormous range of disciplines--forest scientists, botanists,...