In one thing Freud agrees with the introspectionists, viz., in deliberately neglecting the "physiological factor" and building on purely psychological foundations, although for Freud psychology is mainly unconscious, while for the introspectionists it is pure consciousness. Neither he nor his disciples have yet recognized the aid proffered them by students of the autonomic system or by the distinctions between the epicritic and protopathic functions and organs of the cerebrum, although these will doubtless come to have their due place as we know more of the nature and processes of the unconscious mind. If psychologists of the normal have hitherto been too little disposed to recognize the precious contributions to psychology made by the cruel experiments of Nature in mental diseases, we think that the psychoanalysts, who work predominantly in this field, have been somewhat too ready to apply their findings to the operations of the normal mind; but we are optomistic enough to believe that in the end both these errors will vanish and that in the great synthesis of the future that now seems to impend our science will be made vastly richer and deeper on the theoretical side and also far more practical than it has ever been before. G. STANLEY HALL. Clark University, April, 1920. CONTENTS PART ONE _The Psychology of Errors_ PAGE PREFACE G. Stanley Hall V LECTURE I. INTRODUCTION 1 II. THE PSYCHOLOGY OF ERRORS 10 III. THE PSYCHOLOGY OF ERRORS--(_Continued_) 23 IV. THE PSYCHOLOGY OF ERRORS--(_Conclusion_) 41 PART TWO _The Dream_ V. DIFFICULTIES AND PRELIMINARY APPROACH 63 VI. HYPOTHESIS AND TECHNIQUE OF INTERPRETATION 78 VII. MANIFEST DREAM CONTENT AND LATENT DREAM THOUGHT 90 VIII. DREAMS OF CHILDHOOD 101 IX. THE DREAM CENSOR 110 X. SYMBOLISM IN THE DREAM 122 XI. THE DREAM-WORK 141 XII. ANALYSES OF SAMPLE DREAMS 153 XIII. ARCHAIC REMNANTS AND INFANTILISM IN THE DREAM 167 XIV. WISH FULFILLMENT 180 XV. DOUBTFUL POINTS AND CRITICISM 194 PART THREE _General Theory of the Neuroses_ XVI. PSYCHOANALYSIS AND PSYCHIATRY 209 XVII. THE MEANING OF THE SYMPTOMS 221 XVIII. TRAUMATIC FIXATION--THE UNCONSCIOUS 236 XIX. RESISTANCE AND SUPPRESSION 248 XX. THE SEXUAL LIFE OF MAN 262