Sorry if I am dragging this on, but it is interesting how many of the Puritans held to the view that the Sorcerers conjure was a demonic apparition. Was working on this work today, and here is another from the Puritan Philip Goodwin in "The Mystery of Dreams."
"2. As referring to Satan that filthy and unclean spirit, who hath no little hand in such loathsome Dreams. The Devil indeed not having a body himself, cannot commit bodily filthiness, but he can conform himself so to the phantasy; as to further this mental filthiness in and with others. Very strange things (as to appearance) men may do by the power of Satan, so several Sorcerers have exceeded, as Justin Martyr, Austin and Others report things very strange. And may not Satan by himself immediately manage marvelous matters, causing shapes and forms to appear of all kinds of creatures, as to mans ocular part or his eye without: Pliny, Philostratus and others, give several instances herein: So to mans imaginary power interpose himself, causing things and persons to appear to the putative faculty effecting these filthy Dreams. He that came in Samuels Robe in the Serpents form, yea transforming himself as an Angel of Light to men awake, may not he come in other ways and manners to men asleep?"