Produced by Audrey Longhurst, Joel Schlosberg and the PG Online Distributed Proofreading Team. NERVOUS AND MENTAL DISEASE MONOGRAPH SERIES NO. 7 THREE CONTRIBUTIONS TO THE THEORY OF SEX _SECOND EDITION_ _SECOND REPRINTING_ BY PROF. SIGMUND FREUD, LL.D. VIENNA AUTHORIZED TRANSLATION BY A.A. BRILL, PH.B., M.D. CLINICAL ASSISTANT, DEPARTMENT OF PSYCHIATRY AND NEUROLOGY, COLUMBIA UNIVERSITY; ASSISTANT IN MENTAL DISEASES, BELLEVUE HOSPITAL; ASSISTANT VISITING PHYSICIAN, HOSPITAL FOR NERVOUS DISEASES WITH INTRODUCTION BY JAMES J. PUTNAM, M.D. NERVOUS AND MENTAL DISEASE PUBLISHING CO. NEW YORK AND WASHINGTON 1920 NERVOUS AND MENTAL DISEASE MONOGRAPH SERIES Edited by Drs. SMITH ELY JELLIFFE and WM. A. WHITE Numbers Issued 1. Outlines of Psychiatry. (7th Edition.) $3.00. By Dr. William A. White. 2. Studies in Paranoia. (Out of Print.) By Drs. N. Gierlich and M. Friedman. 3. The Psychology of Dementia Praecox. (Out of Print.) By Dr. C.G. Jung. 4. Selected Papers on Hysteria and other Psychoneuroses. (3d Edition.) $3.00. By Prof. Sigmund Freud. 5. The Wassermann Serum Diagnosis in Psychiatry. $2.00. By Dr. Felix Plaut. 6. Epidemic Poliomyelitis. New York, 1907. (Out of Print.) 7. Three Contributions to Sexual Theory. (3d Edition.) $2.00. By Prof. Sigmund Freud. 8. Mental Mechanisms. (Out of Print.) $2.00. By Dr. Wm. A. White. 9. Studies in Psychiatry. $2.00. New York Psychiatrical Society. 10. Handbook of Mental Examination Methods. $2.00. (Out of Print.) By Shepherd Ivory Franz. 11. The Theory of Schizophrenic Negativism. $1.00. By Professor E. Bleuler. 12. Cerebellar Functions. $3.00. By Dr. André-Thomas. 13. History of Prison Psychoses. $1.25. By Drs. P. Nitsche and K. Wilmanns. 14. General Paresis. $3.00. By Prof. E. Kraepelin. 15. Dreams and Myths. $1.00. By Dr. Karl Abraham. 16. Poliomyelitis. $3.00. By Dr. I. Wickmann. 17. Freud's Theories of the Neuroses. $2.00. By Dr. E. Hitschmann. 18. The Myth of the Birth of the Hero. $1.00. By Dr. Otto Rank. 19. The Theory of Psychoanalysis. $1.50. (Out of Print.) By Dr. C.G. Jung. 20. Vagotonia. $1.00. (3d Edition.) By Drs. Eppinger and Hess. 21. Wishfulfillment and Symbolism in Fairy Tales. $1.00. By Dr. Ricklin. 22. The Dream Problem. $1.00. By Dr. A.E. Maeder. 23. The Significance of Psychoanalysis for the Mental Sciences. $1.50. By Drs. O. Rank and D.H. Sachs. 24. Organ Inferiority and its Psychical Compensation. $1.50. By Dr. Alfred Adler. 25. The History of the Psychoanalytic Movement. $1.00. By Prof. S. Freud. 26. Technique of Psychoanalysis. $2.00. By Dr. Smith Ely Jelliffe. 27. Vegetative Neurology. $2.00. By Dr. H. Higier. 28. The Autonomic Functions and the Personality. $2.00. By Dr. Edward J. Kemp. 29. A Study of the Mental Life of the Child, $2.00. By Dr. H. Von Hug-Hellmuth. 30. Internal Secretions and the Nervous System. $1.00. By Dr. M. Laignel Lavastine. 31. Sleep Walking and Moon Walking. $2.00.