Fact and fable in psychology can only be separated by the logical sifting of evidence, by the exercise of the prerogative of a scientific point of view substantiated and fortified by the lessons embodied in the history of rational opinion. The cause of truth and the overthrow of error must sometimes be fought in drawn battle and with the clash of arms, but are more frequently served by the inauguration of an adherence to one side and the consequent desertion of the other. Both procedures may be made necessary by the current status of psychological discussion. The present collection of essays is offered as a contribution towards the realization of a sounder interest in and a more intimate appreciation of certain problems upon which psychology has an authoritative charge to make to the public jury. These essays take their stand distinctively upon one side of certain issues, and as determinately as the situation seems to warrant, antagonize contrary positions; they aim to oppose certain tendencies and to support others; to show that the sound and profitable interest in mental life is in the usual and normal, and that the resolute pursuit of this interest necessarily results in bringing the apparently irregular phenomena of the mental world within the field of illumination of the more familiar and the law-abiding. They further aim to illustrate that misconceptions in psychology, as in other realms, are as often the result of bad logic as of defective observation, and that both are apt to be called into being by inherent mental prepossessions. Some of the essays are more especially occupied with an analysis of the defective logic which lends plausibility to and induces credence in certain beliefs; others bring forward contributions to an understanding of phenomena about which misconception is likely to arise; still others are presented as psychological investigations which, it is believed, command a somewhat general interest. The prominence of the discussion of unfortunate and misleading tendencies in psychological opinion should not be allowed to obscure the more intrinsically important problems which in the main are of a different, though possibly not of an unrelated character. I should be defeating one of the purposes of these essays if, by the discussion of mooted positions, I conveyed the notion that the problems thus presented were naturally the fundamental ones about which advance in psychology may be most promisingly centred. I deeply regret that the dispossession of fable requires more resolute and more elaborate exposition than the unfoldment of fact; but such is part of the condition confronting the critical student of psychological opinion. I must depend upon the reader to make due allowances for this foreshortening of a portion of the composition, and so to bring away a truer impression of the whole than the apparent perspective suggests.