Although the authors presented this subject purely objectively, yet their studies are extremely interesting and important, and show conclusively the importance of psychopathological methods in criminology. One who is interested in this subject will find this monograph of great value and help. It may also be added that the authors give a complete list of the casuistic literature of the murder among lovers. MORRIS J. KARPAS. DEVELOPMENT AND PURPOSE. AN ESSAY TOWARDS A PHILOSOPHY OF EVOLUTION. By L. T. Hobhouse, Martin White Professor of Sociology in the University of London. Macmillan & Co., London: 1913; pp. xxix, 383. "Development and Purpose" is essentially the complement of Professor Hobhouse's well-known and valuable "Mind in Evolution," published in 1901; if it were rather a continuation than the complement, many would be pleased, for the exposition already made practically guarantees a rich application, were it undertaken, to matters still further "away" in the realm of thought. The present volume lacks the multitude of scientific data and references which make "Mind in Evolution" so important for the study of psychology (as behavior or not as behavior, as the reader pleases), but it contains in their space many timely discussions, in some cases seemingly prophetic, of teleology in its relation to evolution. The seventeen chapters of the book (there is also an extremely thoughtful Introduction and a full Index), are divided into two parts, one entitled "Lines of Development" and the other "The Conditions of Development." The reviewer's lazy cortex, and possibly those of other and more leisurely readers, is made glad by a complete chapter-synopsis or syllabus, occupying seven pages). So much of the whole treatise is suggested in the synopsis of the first three chapters that it is well to give them in full, as follows: "I. The Nature and the Significance of Mental Evolution. (1) The biological view regards Mind as an organ evolved to adapt behavior to the environment, (2) and tends to reduce its action to a mechanical process. (3) Parallelism in the end reduces Mind to an epi-phenomenon {an important undoubted fact which has been often ignored by what are left of the Parallelists!] (4) The object of Comparative Psychology is to determine empirically the actual function of Mind in successive stages of development. (5) It involves a social as well as an individual psychology. (6) The statement of the higher phases also opens up philosophical questions, (7) and on the solution of these depends the final interpretation of the recorded movement. "II. The Structure of Mind. (1) Mental operations are known in the first instance as objects of consciousness. (2) Mind is the permanent unity including consciousness and the sum of processes continuous with consciousness and determining it. (3) These processes involve, but are not identical with physical processes, constituting with them a psychophysical unity.