logical and experimental psychology. The discussion turns for the most part about the earlier developments of the new science, with less notice taken than the specialist could wish of the later or most recent phases of psychological thinking. It is for this reason, among others, that the chapter falls out less complete than is the case with the author's accounts of other divisions of the scientific field; the psychologist, at least, misses a discussion of the interpretation of Weber's law, of psychometry, in the sense of the time-measurement of psychical states, and what is remarkable in view of the author's decided tendency to equate science with exact knowledge mathematically formulated, a full and thoroughgoing discussion of the general question of mental measurement.
It would be misleading, however, to suggest such possible criticisms without dwelling once more on the importance of Mr. Merz's undertaking, and the great success with which he has executed this first part of his elaborate programme. The two volumes now completed form, with their detailed analytic index, a treatise complete in itself and of the highest value for all who desire an intelligent understanding of the thought of the age. Nowhere in English will the student find a record of modern science so comprehensive in its plan and so excellently carried out in details, by a writer who himself has gained a sympathetic mastery of the subject which he treats. Few things could be more helpful to philosophical inquirers than a careful study of this history of the phenomenal thinking on which, as we now agree, their own speculative endeavors must so largely be based; and few, it may also be added, more salutary for the man of science proper, who, as now too often happens, lacks just that broad outlook over the field of phenomenal investigation which the present treatise is fitted to afford.
A. C. Armstrong.
Wesleyan University.
As the subtitle indicates, this book may be regarded as an expression of a renaissance of coöperation beween scientists, especially biologists, and philosophers. The book is not a systematic treatise, but consists, in the fashion of books nowadays, of an introduction and a collection of essays, some of which have been published before. The headings are as follows: Introduction: Responsabilité de Dieu et responsabilité de la nature; I. De l'orientation de la méthode en évolutionisme; II. Évolution et liberté; III. Évolution et socialisme; IV. La prière; V. Dieu et le monde; VI. Finalisme; VII. Conscience
