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Eleven timely, well written and carefully chosen articles make up the attractive second volume of this book. The contributors, all active workers and acknowledged authorities in selected fields, have condensed and summarized each subject to a remarkable degree. All contributions are organized and set up in a most useful and readable form; the bibliographies are excellent. Helping to bridge the gap which unfortunately must always exist between current publications and textbooks, such a volume will certainly be useful to all workers in this and allied special ies.