This volume is the fourth in a projected seven-volume series sponsored by the American Psychological Association. It explores the interrelationships between psychology and other areas of biological science, with a focus on genetics and neurophysiology. The chapters are scholarly and well-documented, making it an important reference work in the field. This introductory textbook provides a comprehensive overview of general psychology for college-level courses. It is well-written and illustrated with photographs, diagrams, and charts. Each chapter includes a list of recommended references, though the discussion of genetic components in behavioral problems is brief. This is the first of three volumes in a multivolume handbook on physiology, specifically focusing on circulation. It covers the physiology and biophysics of blood and its exchangeable fluids, as well as the action and control of the heart. Each chapter delves deeply into a particular aspect of circulatory physiology. While it does not include genetic discussions, the material is significant for geneticists. The series is designed as a reference work and should become a standard resource for many years. This monograph, originally published in 1947, provides a comprehensive summary of the effects of ionizing radiations on living systems. The second edition, published in 1955, was not significantly updated, and the paperback version is a reprint of this edition. The additional appendix and references are inadequate for recent developments.This volume is the fourth in a projected seven-volume series sponsored by the American Psychological Association. It explores the interrelationships between psychology and other areas of biological science, with a focus on genetics and neurophysiology. The chapters are scholarly and well-documented, making it an important reference work in the field. This introductory textbook provides a comprehensive overview of general psychology for college-level courses. It is well-written and illustrated with photographs, diagrams, and charts. Each chapter includes a list of recommended references, though the discussion of genetic components in behavioral problems is brief. This is the first of three volumes in a multivolume handbook on physiology, specifically focusing on circulation. It covers the physiology and biophysics of blood and its exchangeable fluids, as well as the action and control of the heart. Each chapter delves deeply into a particular aspect of circulatory physiology. While it does not include genetic discussions, the material is significant for geneticists. The series is designed as a reference work and should become a standard resource for many years. This monograph, originally published in 1947, provides a comprehensive summary of the effects of ionizing radiations on living systems. The second edition, published in 1955, was not significantly updated, and the paperback version is a reprint of this edition. The additional appendix and references are inadequate for recent developments.