The door did not open; the curtain was not lifted.

Nay, if the wrist or hand of the seer is burned or withered, as in a crowd of stories, the ghost's hand did not produce the effect.

It was produced in the same way as when a hypnotised patient is told that "his hand is burned," his fancy then begets real blisters, or so we are informed, truly or not.

The stigmata of St.Francis and others are explained in the same way.

{70} How ghosts pull bedclothes off and make objects fly about is another question: in any case the ghosts are not _seen_ in the act.
Thus the clothes of ghosts, their properties, and their actions affecting physical objects, are not more difficult to explain than a naked ghost would be, they are all the "stuff that dreams are made of".