WASHINGTON, May 7 -- The Carnegie Institution for Science issued the following news: * * * The Desert Laboratory: Carnegie Science's Pioneering Role in American Ecology Carnegie Science's Desert Laboratory in Tucson, Arizona served as an intellectual hub where pioneering ecologists helped transform the emerging discipline of ecology from descriptive natural history into a rigorous scientific field. In 1903, Carnegie Science established the Desert Botanical Laboratory in Tucson, Arizona--a bo  more