The somnanbulist, for instance, may get up at night time and write a letter, then go to bed again and not know anything of the event when he awakes in the morning. We have no reason to claim that he had no knowledge of the letter in his consciousness when he wrote it. It is exactly the same consciousness from a psychological standpoint as the one with which he wakes up. Only that special content has in an abnormal way entirely disappeared, has not left a possibility of awakening a memory image, and the action of the personality in writing has thus become separated and cut off from the connected experiences of the man. But while the nocturnal episode may be entirely forgotten, it was not less in consciousness for the time being, than if a normal man should leave his bed hastily to write a letter. Moreover under abnormal conditions, as for instance in severe hysteric cases, those dissociated contents may form large clusters of mental experiences in the midst of which a new idea of the own personality may develop. Considering that through such disconnection many channels of discharge are blocked, while others are abnormally opened, it seems only natural that the idea of the own acting personality becomes greatly changed. Thus we have in such an episode a new second personality which may be strikingly different in its behavior and in its power, in its memories and in its desires, from the continuous normal one, and this secondary personality may now develop its own continuity and may arise under special conditions in attacks which are connected among one another by their own memory bonds.