Mediums and trance-phenomena—prophecy, second sight, speaking in strange tongues, the appearance of flames and lights, and of figures apparently from the dead—are things that have been known all down history, and recognized almost as a matter of course, both among quite primitive peoples like the Kaffirs, or the Aleuts or the Mongolians, or among the more cultured like the Greeks, the Romans, the Hindus, Chinese, and so forth. The Bible teems with references to wizards and “necromancers” (note the meaning of the word); and the story of the Witch of Endor gives us a penetrating glimpse into what was evidently a common practice of “consultation.” These phenomena have never been so common as to break up and disorganize the routine of ordinary life, yet they have always been there, and recognized, as on the fringe or borderland—in somewhat the same way as the knowledge or recognition of Death does not interfere with daily life or prevent us making engagements; though we know it _may_ do so at any time. And beyond any direct uses that trance-communication and manifestations may have now, or may have had in the past (a matter on which no doubt there is a good deal of difference of opinion), we may fairly suppose that as examples of real things and of a real world lying just outside the sphere of our ordinary and actual experience they may be of immense value—both as delivering us from a cramped and petty belief that we have already fathomed the possibilities of the universe, and as giving us just a hint and a glimpse of directions in which we may fairly look for the future. That we should for the present be limited for the most part to a definite sphere of activity, or to a definite region of creation, seems only natural. “One world, please, at a time!” said Thoreau when on his deathbed he was plagued by some pious person about the future life; and if _we_ in our daily life were entangled in the manifestations of two very different planes of existence it might be greatly baffling. At the same time, the occasional hint or message from another plane may be of the greatest help.