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 ally Demonstrated, New York, 1855. But the spirits did not for long restrict themselves to merely audible signs; they responded generously to the attention paid to them and soon began to reveal their hands, faces, and even their whole persons for physical observation, often pelting the audience with flowers, presenting them with bouquets, and showing themselves to be accomplished musicians in the negro mode by performances on unseen instruments. Although their deeds were never dark, yet they always insisted on darkness as indispensable for the perpetration of them. In 1852, after the craze reached England, many men of academical and scientific repute observed and attested incredible phenomena, of which Prof. Challis of Cambridge said that, if the statements had to be rejected, "the possibility of ascertaining facts by human testimony must be given up." Mr. A. R. Wallace, the congener of Darwin, became a convert, and bore witness to the miracles of Mrs. Guppy, her floral materializations, etc.; Modern Miracles and Spiritualism, 1874, etc. (I cannot omit to mention that this author, at one time at least, was an anti-vaccinationist). Sir W. Crookes, the celebrated scientist, had séances in his own house, where he walked and talked with a young lady from the Orient, dead a century before, subjected her to a quasi-medical examination, and possessed himself of a lock of her hair; Researches on the Phenomena of Spiritualism, 1870. The professors of Leipzig University received the celebrated medium, Dr. Slade, in their private study on several occasions, when he satisfied them of his ability to perform the impossible by producing untieable knots, passing matter through matter, and causing writing to appear on slates from invisible correspondents; Transcendental Physics, by Prof. Zöllner, Lond., 1883. Other observers who upheld the reality of spiritual achievements are Sir R. Burton, Mr. Cromwell Varley, F.R.S., Dr. Lockhart Robinson, Lord Lindsay, etc. The list of veracious witnesses is, in fact, a long one and a weighty. Yet all these eminent men have been deceived by cunning impostors. See the Reports of the Societies for Psychical Research, English and American, which have been issued regularly for nearly twenty years. Hallucinations, ghost-stories, and hypnosis have been exhaustively investigated, but no spirits have ventured to materialize themselves whenever conclusive tests were insisted on. At the most it has been demonstrated that telepathy, a kind of wireless telegraphy between brain and brain, may occur under favourable but rare conditions. Whenever trickery II. In an idle hour Plato applied himself to shadowing