The criterion of penality once accepted, it is necessary to find the indices of this lack of fitness, of the impossibility of adaptation to social life, which justifies repression. M. Garofalo seeks them no longer in "premeditation," but he finds them in the motive of the crime and in the way in which it has been prepared or perpetrated. We cannot follow him into the details of this discussion, which presents the highest interest. Our exceptions would turn on the interpretation of certain features; they do not bear on the general principles of this great and solid work. LUCIEN ARRÉAT. BOOK REVIEWS. THE PRINCIPLES OF PSYCHOLOGY. By _William James_, Professor of Psychology in Harvard University. In two volumes. New York: Henry Holt & Co., American Science Series. Advanced Course. In the present status of psychological science every attempt to gather the diversified facts and views and present them in a single, though extensive work, cannot but be scrutinised with great care and interest; and when this work comes from the pen of one who has gained so wide and appreciative a circle of readers, the interest becomes deeper and more personal. It was, perhaps, the professor of mental science, struggling for years with text-books, inadequate, or antiquated, or narrow, or unscientific, or dry, or unpedagogic, who most anxiously awaited the appearance of Professor James's volumes; and his expectation was the more warranted, as the work was announced in a series of text-books deservedly successful and popular. To such a one, the work itself does not come to fill the place of a text-book; not alone the great length (1,400 pages), but the general supposition of knowledge on the part of the reader which it is the object of college courses to supply, together with the selection of topics and the peculiar division of space amongst them, limit the work to students of a much more advanced type than (unfortunately, perhaps) American education as yet supplies. But while our professor must still patiently hope for some work that will present in brief and convenient form the main facts of Psychology, he will find his task made easier and more interesting by these welcome volumes. He will find in them an original and frequently brilliant treatment of many of the deepest problems of modern Psychology: and it is as a contribution to science and as an aid to the professional student that a discussion of their contents and tenets will be pertinent in these pages.