The phenomena now associated with modern Spiritualism, with their characteristic _milieu_, breed the typical atmosphere of the séance chamber, which resists precise analysis, but which in its extreme form involves morbid credulity, blind prepossession, and emotional contagion; while the dependence of the phenomena on the character of the medium offers strong temptation alike to shrewdness, eccentricity, and dishonesty. On the side of his teachings the Spiritualist is likewise not strikingly original. The relations of his beliefs to those that grew about the revelations of Swedenborg, to the speculations of the German "pneumatologists," and to other philosophical doctrines, though perhaps not intimate, are yet traceable and interesting; and in another view the Spiritualist is as old as man himself, and finds his antecedents in the necromancer of Chaldea, or in the Shaman of Siberia, or the Angekok of Greenland, or the spirit-doctor of various savage tribes. The modern mediums are thus simply repeating with new costumes and improved scenic effects the mystic drama of primitive man. Spiritualism thus appeals to a deep-seated craving in human nature, that of assurance of personal immortality and of communion with the departed. Just so long as a portion of mankind will accept material evidence of such a belief, and will even countenance the irreverence, the triviality, and the vulgarity surrounding the manifestations; just so long as those persons will misjudge their own powers of detecting how the alleged supernatural appearances are really produced, and remain unimpressed by the principles upon which alone a consistent explanation is possible, just so long will Spiritualism and kindred delusions flourish.