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