and partly amused to have her bring me the following sentence from
White and Jelliffe: "Consciousness covered over and obscured the inner
organs of the psyche just as the skin hides the inner organs of the
body from vision." My originality had vanished and I was close to
plagiarism. Indeed, if a history of plagiarism could be written, it
would probably abound in just such stories. I had read the article
containing this sentence only once, about three years before, and had
never quoted it or consciously thought of it. It had lain buried for
three years, only to come forth as an original idea of my own. Who
knows how many times we all do just this thing without catching
ourselves in the trick?

=Back-Door Memories.= There are other kinds of memories which hide in
the subconscious, memories of experiences which have not come in by
the front door, but have entered the mind during special states, such
as sleep, delirium, intoxication, or hypnosis. What is known as
post-hypnotic suggestion is the functioning of a suggestion received
during hypnosis and emerging later as an impulse without being
recognized as a memory. A man in a hypnotic state is told that at five
o'clock he will take off his clothes and go to bed, without
remembering that such a suggestion has been given him. He awakens with
no recollection of the suggestion, but at five o'clock he suddenly
feels impelled to go to bed, even though his unreasonable desire puts
him into a highly embarrassing position. The suggestion, to be thus
effective, must have been conserved somewhere in his mind outside of
consciousness.

Suggestions that enter the mind during the normal sleep are also
recorded,--a fact that carries a warning to people who are in the
habit of talking of all sorts of matters while in the room with