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The Invertebrates. Vol. V. Smaller Coelomate Groups Chaetognatha, Hemichordata, Pogonophora, Phoronida, Ectopracta, Brachiopoda, Sipunculida. The Coelomate Bilateria

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BOOK REVIEWS PRINCIPLES OF GENERAL PHYSIOLOGY. Vol. 1. THE PHYSICO-CHEMICAL BACKGROUND. By L. E. Bayliss. London, New York, Toronto, Longmans, Green and Co., 1959. xii, 520 pp. $11.50. This book, with the proposed second volume, is to constitute a 5th edition of the work of the same title by the author's father, W. M. Bayliss. The last edition of that book appeared in 1924, the year of Sir William's death. Since that time his son has become known to students of the medical sciences as co-author of one of the more readable textbooks of human physiology. The ten chapters of the present volume deal with physical chemistry, as did the early chapters of the older Bayliss, but the new treatment is con- siderably more advanced. The selection of topics is good and the physical chemistry is, in general, sound. However, the definition of equivalent con- ductivity (p. 119) is not only unusual but off by a factor of 1000. It is odd to find the electromotive force of a concentration cell without liquid junction derived from two equations for liquid junction potentials (p. 144). The equation relating osmotic pressure to the Donnan ratio (p. 273) contains two errors of sign. About a dozen other more obvious but annoying errors were noticed. The chapters which will probably be most useful to students are the last three, on oxidation and reduction, actions of light and other radiations, and the passage of substances through membranes. These topics are more closely related to living systems than some of those discussed in the earlier chapters. If the second volume is as good as the first, L. E. Bayliss's Principles of General Physiology will be a worthy successor to his father's book. DAVID I. HITCHCOCK THE INVERTEBRATES. VOL. V. SMALLER COELOMATE GROUPS. CHAETOGNA- THA, HEMICHORDATA, POGONOPHORA, PHORONIDA, ECTOPRACTA, BRACHI- OPODA, SIPUNCULIDA. THE COELOMATE BILATERIA. By Libbie Henrietta Hyman. New York, McGraw-Hill Book Company, Inc., 1959. vii, 783 pp. Illus. $13.50. The appearance of Volume V of The

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