Indeed, it is far more plausible to suppose that the possessor or demon mind would find it far easier to make the journey than the other personality, for it is recognized that the release of the actual body occurs in trance or dream state. We have here, then, some possible psychic explanation of many of the cases of sorcery where the complaint of the sufferers was that they were victimized during sleep by demons. In other words, they were the recipients of undesired attentions by the astral body of either the sorcerer or his followers or associates. This has been suggested to me in various forms by people who have believed themselves the victims of discarnate spirits--and who were at times possessed by them against their wills. It must, however, be admitted that in all such cases which came under my notice there had been connection with Spiritualist circles or with minor forms of occultism, and it was impossible to exclude the possibility of previous hypnosis, autosuggestion, or the little-known but common phenomena of psychic invasion--by other members of the circle. Viewed from the psychical point of view, possession is an extremely difficult problem. Real spirit possession might occur, suggestion or psychic invasion is often indicated; and, as I have explained, multiple personality and the concentration of evil repressed desires in the secondary individuality furnishes a complete scientific explanation of the phenomenon. These cases must be taken individually, and there are not yet grounds for laying down a general explanation of all the phenomena. One of the great difficulties is the natural reluctance of the victims to disclose exact details, but no case of possession which was not either openly or secretly erotic is known to be recorded. Possessions fall under two heads: those in which the possessing spirit urges the victim to the commission of injurious acts in person, and thereby derives direct satisfaction through the body; and those in which a vicarious satisfaction is achieved through the astral body. The possibility of intercourse between spirit and mortal has been held to be a possibility since Biblical times, and the expulsion of the fallen angels was due to this sin.[43] Stainton Moses held that much of the lower phenomena was caused by spirits who had not yet reached man’s plane of intelligence, just as some was produced by others who had proceeded further and returned to enlighten man.[44] This belief occurs in folklore, in Oriental religions, and in a myriad variations. The djinn of the _Arabian Nights_ is a very real thing to the modern native, and a considerable literature exists in which the intercourse between djinn and mortal is the main theme. In the same way the belief in fairy wives or husbands is not so long dead in Europe and alive to-day among the hill tribes of the Pamirs.