In this day of complex interscience fields, no one person can keep up with all the things he needs to know. One answer to this problem is the present volume, bringing together concise but pertinent articles on some 800 different biological fields, which enables the reader to quickly review or learn essential ideas about those fields. The coverage is excellent, ranging from historical biographies of famous workers in Biology, to philosophical attempts to explain future possibilities of certain areas. Specialized methods are usually discussed, enabling the reader to see not only why but how the science operates, as well as whether that science could serve him in one way or another. Further references to each field are usually given, these going from basic general works, to detailed, current journal articles. The illustrations are excellent, and include the entire range from simple line graphs, to continuous tone electron photomicrographs of 60,000 Ⅹ magnification or more.