You will imagine how incompletely I am sketching a large number of the connections bound up with the Oedipus complex which practically and theoretically are of great importance. I shall not go into the variations and possible inversions of it at all. Of its less immediate effects I should like to allude to one only, which proves it to have influenced literary production in a far-reaching manner. Otto Rank has shown in a very valuable work that dramatists throughout the ages have drawn their material principally from the Oedipus and incest complex and its variations and masked forms. It should also be remarked that long before the time of psycho-analysis the two criminal offences of Oedipus were recognized as the true expressions of unbridled instinct. Among the works of the Encyclopædist Diderot you will find the famous dialogue, _Le neveu de Rameau_, which was translated into German by no less a person than Goethe. There you may read these remarkable words: _Si le petit sauvage était abandonné à lui-même, qu’il conserva toute son imbecillité et qu’il réunit au peu de raison de l’enfant au berceau la violence des passions de l’homme de trente ans, il tordrait le cou à son père et coucherait avec sa mère_. There is yet one thing more which I cannot pass over. The mother-wife of Oedipus must not remind us of dreams in vain. Do you still remember the results of our dream-analyses, how so often the dream-forming wishes proved perverse and incestuous in their nature, or betrayed an unsuspected enmity to near and beloved relatives? We then left the source of these evil strivings of feeling unexplained. Now you can answer this question yourselves. They are dispositions of the Libido, and investments of objects by Libido, belonging to early infancy and long since given up in conscious life, but which at night prove to be still present and in a certain sense capable of activity. But, since all men and not only neurotic persons have perverse, incestuous, and murderous dreams of this kind, we may infer that those who are normal to-day have also made the passage through the perversions and the object-investments of the Oedipus complex; and that this is the path of normal development; only that neurotics show in a magnified and exaggerated form what we also find revealed in the dream-analyses of normal people. And this is one of the reasons why we chose the study of dreams to lead up to that of neurotic symptoms. TWENTY-SECOND LECTURE ASPECTS OF DEVELOPMENT AND REGRESSION. ÆTIOLOGY As we have heard, the Libido-function goes through an extensive development before it can enter the service of reproduction in the way that is called normal. Now I wish to show you the significance of this fact for the causation of the neuroses.