some past trauma is the condition sine qua non of the neurosis. Yet Freud’s ingenious empiricism presented even in the “Studies in Hysteria” some views, insufficiently exploited at the time, which contained the elements of a theory that perhaps more accentuates the value of environment than inherited or traumatic predisposition. The Conception of “Repression” Freud synthesized these observations in a form that was to extend far beyond the limits of the shock-theory. This conception is the hypothesis of repression (“Verdrängung”). As you know, by the word “repression” is understood the psychic mechanism of the re-transportation of a conscious thought into the unconscious sphere. We call this sphere the “unconscious” and define it as the psyche of which we are not conscious. The conception of repression was derived from the numerous observations made upon neurotic patients who seemed to have the capacity of forgetting important events or thoughts, and this to such an extent that one might easily believe nothing had ever happened. These observations can be constantly made by anyone who comes into close psychological relations with his patients. As a result of the Breuer and Freud studies, it was found that a very special method was needed to call again into consciousness those traumatic events long since forgotten. I wish to call attention to this fact, since it is decidedly astonishing for a priori we are not inclined to believe that valuable things can ever be forgotten. For this reason several critics object that the reminiscences which have been called into consciousness by certain hypnotic processes are only suggested ones, and do not correspond with reality. Even granting this, it would certainly not be justifiable to regard this in itself as a condemnation of “repression,” since there are and have been not a few cases where the fact of repressed reminiscences can be proved by objective demonstration. Even if we exclude this kind of proof, it is possible to test the phenomena by experiment. The association-tests provide us with the necessary experiences. Here we find the extraordinary fact that associations pertaining to complexes saturated with emotion emerge with much greater difficulty into consciousness, and are much more easily forgotten. As my experiments on this subject were never reëxamined, the conclusions were never adopted, until just lately, when Wilhelm Peters, a disciple of Kraepelin, proved in general my previous observation, namely, that painful events are very rarely correctly reproduced (“die unlustbetonten Erlebnisse werden am seltensten richtig reproduciert”).