A lady was staying at a country house.

During the night and immediately on waking up she had an apparition of a strange-looking man in mediaeval costume, a figure by no means agreeable, and which seemed altogether unfamiliar to her.

The next morning, on rising, she recognized the original of her hallucinatory image in a portrait hanging on the wall of her bedroom, which must have impressed itself on her brain before the occurrence of the apparition, though she had not attended to it.

Oddly enough, she now learnt for the first time that the house at which she was staying had the reputation of being haunted, and by the very same somewhat repulsive-looking mediaeval personage that had troubled her inter-somnolent moments.

The case seems to me to be typical with respect to the genesis of ghosts, and of the reputation of haunted houses.
* * * * * NOTE.
THE HYPNOTIC CONDITION.
I have not in this chapter discussed the relation of dreaming to hypnotism, or the state of artificially produced quasi-sleep, because the nature of this last is still but very imperfectly understood.