_October_ 1915. PREFACE This volume pursues a different method, in its treatment of the problems of folk psychology, from that employed in my more extensive treatment of the subject. Instead of considering successively the main forms of expression of the folk mind, the present work studies the phenomena, so far as possible, synchronously, exhibiting their common conditions and their reciprocal relations. Even while engaged on my earlier task I had become more and more convinced that a procedure of this latter sort was required as its supplement. Indeed, I believed that the chief purpose of investigations in folk psychology must be found in a synthetic survey. The first prerequisite of such a survey is, of course, a separate examination of each of the various fields. The history of the development of the physical organism aims to understand not merely the genesis of the particular organs but primarily their co-operation and the correlation of their functions. An analogous purpose should underlie an account of the mental development of any human community and, finally, of mankind itself. In addition to the problem of the relations of the separate processes to one another, however, we must in this case face also the broader question as to whether or not mental development is at all subject to law. This it is, therefore, that the sub-title of the present volume is intended to suggest. That we can be concerned only with outlines, moreover, and not with an exhaustive presentation of details, follows from the very fact that our aim is a synthetic survey. An exhaustive presentation would again involve us in a more or less detached investigation of single problems. A briefer exposition, on the other hand, which limits itself to arranging the main facts along lines suggested by the subject-matter as a whole, is, without doubt, better adapted both to present a clear picture of the development, and to indicate its general amenability to law, the presence of which even the diversity of events cannot conceal.