Among the experiences which recur continually in the early history of neurotics and, in fact, are never lacking, some are of particular significance and accordingly I consider them worthy of special treatment. I shall enumerate a few examples of this species: observation of the parental intercourse, seduction by an adult, and the threat of castration. It would be a grievous error to assume that physical reality can never be accorded them; this may often be proved beyond doubt by the testimony of adult relatives. So, for example, it is not at all unusual if the little boy who begins to play with his penis, and does not yet know that one must conceal this, is threatened by his parents or nurse with the cutting off of the organ or the guilty hand. Parents often admit upon questioning that they thought they had done the right thing by this intimidation; many individuals retain a correct, conscious memory of these threats, especially if it has occurred in later childhood. When the mother or some other woman makes the threat she usually delegates the responsibility of executing it to the father or to the doctor. In the famous _Struwelpeter_ by the pediatrist Hoffman, of Frankfort, rhymes which owe their popularity to his very fine understanding of the sexual and other complexes of childhood, you find a milder substitute for castration in the cutting off of the thumbs as a punishment for insistent sucking. But it is highly improbable that the threat of castration is actually made as often as it occurs in the analyses of neurotics. We are content to understand that the child imaginatively constructs this threat for himself from suggestions, from the knowledge that auto-erotic satisfaction is forbidden, and from the impression of castration he has received in discovering the female genital. It is, moreover, in no way impossible that the little child, so long as he is not credited with any understanding or memory, will, even in families outside the proletariat, become a witness to the sexual act between his parents or some other group-ups, and it cannot be disproved that the child _subsequently_ understands this impression, and may react upon it. But when this intercourse is described with minute details which could hardly have been observed, or if it turns out to be, as it so frequently does, an intercourse which was not face to face, _more ferarum_, there is no longer any doubt that this phantasy is derived from the observation of the intercourse of animals (dogs) and the unsatisfied curiosity of the child in his period of puberty. The greatest feat of the imagination is the phantasy of having witnessed the coitus of the parents while still unborn in the mother's womb. Of especial interest is the phantasy of having been seduced, because so often it is not a phantasy at all, but a real memory. But luckily it is not real so often as first appears from the results of analysis. Seduction by older children, or children of the same age, is much more