that this is not a scientific treatise, and will plead for a structural analysis of mental life in which nothing is said about practical values. But we already have books in abundance of that type. When the last word has been said about the human mind as a collection of elements and processes, there still remains the real mental life of which each of us is aware, the desires that stir us, the emotions that quicken, the thoughts that uplift, and the will that accomplishes. In this book I have tried to describe the mind in such a way that every reader, whatever his type or vocation, shall be able to identify it, thereby learning more about his own life, finding new clues to success, new incentives to action. Hence it is my hope that many will make immediate use of the principles here under discussion, if not in their own inner conduct, at least in educational work for the benefit of workers young and old who are unable as yet to study or grasp these matters for themselves. I have for the most part passed by the question of the economic advantages which will presumably follow, since these are more obvious, and because in recent works on industrial efficiency, and in the popular magazines, the financial values have been steadily emphasised.

H. W. D.

CAMBRIDGE, MASS., July, 1911.