Obviously, trickster though she was, the girl had no rational motive for her conduct. It had already cost her a good position, and rendered it most unlikely that she would easily get another. And, in fact, this same absence of motive is conspicuous in nearly all the poltergeist cases exposed by the Society for Psychical Research, and by independent investigators. It is also noteworthy that when discovery is made, the active agent is usually found to be a boy or girl, man or woman, constitutionally or temporarily in an abnormal nervous condition. In this particular case, for instance, the girl, Emma Davies, on the testimony of her mother, was subject to "fits." In another case, investigated by the Society, the poltergeist was definitely identified with a little deformed girl, twelve years old, of decidedly abnormal characteristics. In a third case, investigated by Mr. Frank Podmore, another member of the Society and a specialist on poltergeists, a confession of fraud was elicited from a neurotic boy of fifteen--a confession only partial, it is true, but in one sense more illuminating than any full confession would have been. The case is so instructive, both for its revelation of the almost incredible credulity of many devotees of spiritism, and for the light it throws on the problems of physical mediumship, that I quote it, condensed, from Mr. Podmore's detailed review of his investigation.[30] [30] _Proceedings of the Society for Psychical Research_, vol. xii, pp. 101-103. "In the autumn of 1894," he states, "Mrs. B., a lady living in a provincial town, gave me an account of certain curious incidents which had recently taken place in her house. The occupants of the house--an old one--consisted, besides Mrs. B. and her family, of a widow lady, Mrs. D., and her two children, a girl of about twenty, C. D., and a boy of fifteen, E. D. "Mrs. B., C. D., and E. D. had been in the habit of trying experiments with planchette in the evening. Planchette had given them to understand that the house was haunted by four spirits, a wicked marquis, a wicked monk, a lay desperado, and a virtuous and beautiful young lady. These spirits wrote, through planchette, of treasure concealed in the house, of a hidden chamber, and many other matters. Among other proofs were the following: "One evening after dark, Mrs. B., in accordance with directions received through planchette, went with C. D. and E. D. to an old oak tree in the garden, and, standing with the girl and boy on either side, holding a hand of each, she distinctly heard a stone strike the garden roller a few feet off. The phenomenon was repeated twice; and her companions solemnly assured her that they had no part in the performance.