"This book is an essay in the speculative treatment of certain problems, suggested but not usually discussed in the course of a thorough empirical study of mental phenomena. Inasmuch as these problems all relate to the real nature and actual performances and relations of the human mind, the essay may properly be called metaphysical. Let it be confessed, then, that the author comes forward with a treatise in metaphysics--in the more special meaning of that term. I think, however, that in spite of the marked disfavor into which all metaphysics has fallen in certain quarters, no detailed apology for asking readers for such a treatise need be offered in its Preface. Indeed, the first two chapters of the book are occupied in showing how inevitable is the demand which the science of psychology makes for a further philosophical discussion of all its principal problems. The nature of psychology, however, and the nature of philosophy, and especially the nature of the relations existing between the two, are such as to make it undesirable, if not impossible, to consider in one book all the metaphysical problems which this empirical science suggests. Indeed, the whole sphere of philosophical study scarcely does more than this. A somewhat but not wholly arbitrary selection of problems had, therefore, to be made; and their detailed discussion was then brought under the one title, "Philosophy of Mind." The reasons for the selection are made sufficiently clear in the course of the discussion itself"--Preface. (PsycINFO Database Record (c) 2008 APA, all rights reserved).