subject of violence, a reminiscence from his ninth year suddenly
occurred to him. His parents came home late and went to bed while he was
feigning sleep. He soon heard panting and other noises that appeared
strange to him, and he could also make out the position of his parents
in bed. His further associations showed that he had established an
analogy between this relation between his parents and his own relation
toward his younger brother. He subsumed what occurred between his
parents under the conception "violence and wrestling," and thus reached
a sadistic conception of the coitus act, as often happens among
children. The fact that he often noticed blood on his mother's bed
corroborated his conception.

That the sexual intercourse of adults appears strange to children who
observe it, and arouses fear in them, I dare say is a fact of daily
experience. I have explained this fear by the fact that sexual
excitement is not mastered by their understanding, and is probably also
inacceptable to them because their parents are involved in it. For the
same son this excitement is converted into fear. At a still earlier
period of life sexual emotion directed toward the parent of opposite sex
does not meet with repression but finds free expression, as we have seen
before.

For the night terrors with hallucinations (_pavor nocturnus_) frequently
found in children, I would unhesitatingly give the same explanation.
Here, too, we are certainly dealing with the incomprehensible and
rejected sexual feelings, which, if noted, would probably show a
temporal periodicity, for an enhancement of the sexual _libido_ may
just as well be produced accidentally through emotional impressions as
through the spontaneous and gradual processes of development.