This is a welcome addition to the aids available for the study of ecology. The guide is divided into two parts, part one covering principles and processes, and part two dealing with ecological techniques. Both parts are further divided into major areas of study, part one being concerned with the ecosystem and the community, energy economy, water economy, interrelations among organisms, aquatic ecosystems, primary succession, and secondary succession; part two follows the same plan and is subdivided into physiographic and historical studies, community inventories, and special techniques. There is a good, usable bibliography of recent literature.