Immediately derivative of the prevalent belief in demons was the phenomenon known as possession, a state in which many individuals believed that their physical and mental functions had been invaded and were being controlled by either a demon (most common in the period under discussion) or the spirit of someone dead. There is no period of history or quarter of the globe where this phenomenon has not been reported, and in fairly constant terms, and yet it is still to be adequately explained. Since Traugott Oesterreich’s definitive study, first published in 1921, very little has been added to the
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