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Rh position within the limits of savagery. When we have gained a clear idea of it in this its original home, we shall be able to trace it along from grade to grade of civilization, breaking away piecemeal under the influence of new medical theories, yet sometimes expanding in revival, and at least in lingering survival holding its place into the midst of our modern life. The possession-theory is not merely known to us by the statements of those who describe diseases in accordance with it. Disease being accounted for by attack of spirits, it naturally follows that to get rid of these spirits is the proper means of cure. Thus the practices of the exorcist appear side by side with the doctrine of possession, from its first appearance in savagery to its survival in modern civilization; and nothing could display more vividly the conception of a disease or a mental affection as caused by a personal spiritual being than the proceedings of the exorcist who talks to it, coaxes or threatens it, makes offerings to it, entices or drives it out of the patient's body, and induces it to take up its abode in some other. That the two great effects ascribed to such spiritual influence in obsession and possession, namely, the infliction of ailments and the inspiration of oracles, are not only mixed up together but often run into absolute coincidence, accords with the view that both results are referred to one common cause. Also that the intruding or invading spirit may be either a human soul or may belong to some other class in the spiritual hierarchy, countenances the opinion that the possession-theory is derived from, and indeed modelled on, the ordinary theory of the soul acting on the body. In illustrating the doctrine by typical examples from the enormous mass of available details, it will hardly be possible to discriminate among the operating spirits, between those which are souls and those which are demons, nor to draw an exact line between obsession by a demon outside and possession by a demon inside, nor between the condition of the demon-tormented patient and the demon-actuated doctor, seer, or priest. In a word, the confusion of these conceptions in the