Isotopic tracers: A theoretical and practical manual for biological students and research workers. Second edition, revised and enlarged: By G. E. Francis, Reader in Biochemistry, St. Bartholomew's Hospital Medical College; W. Mulligan, Senior Lecturer in Biochemistry, Glasgow University Veterinary School; and A. Wormall, Professor of Biochemistry, St. Bartholomew's Hospital Medical College. With a Foreword by G. Hevesy, University of London. The Athlone Press, 1959. Published in the United States by Essential Books, Fair Lawn, New Jersey. xxi + 524 pp. Price $8.40