Under the heading of "The Phenomena of Percussive and other Allied Sounds," he makes reference to the raps and knocks of various kinds made and heard in different places, "in a living tree, on a sheet of glass, on a stretched iron wire, on a stretched membrane, a tambourine, on the roof of a cab, and on the floor of a theatre," and where no known law, and no contrivance or trickery, could afford any clue to their cause. He then inquires whether the sounds thus heard are the result of some blind, irrational, hidden material force obeying the Laws of Nature. His conclusion, however, was that the varied phenomena being evidently governed by intelligence, a thinking being must have been concerned in their origination. "The intelligence," he maintains, "is sometimes of such a character as to lead to the belief that it does not emanate from any person present." The movement of heavy substances at a distance from the medium is then discussed, and Mr. Crookes thus writes:--
"On three successive evenings a small table moved slowly across the room, under conditions which I had specially pre-arranged, so as to answer any objections which might be raised to the evidence" (p. 84).
Again:--"On five separate occasions a heavy dining-table rose between a few inches and one and a half feet off the floor, under special circumstances which rendered trickery impossible. On another occasion a heavy table rose from the floor in full light, while I was holding the medium's hands and feet. On another occasion the table rose from the floor, not only when no person was touching it, but under conditions that I had pre-arranged, so as to assure unquestionable proof of the fact" (p. 85).
"On one occasion I witnessed a chair, with a lady sitting on it, rise several inches from the ground. On another occasion, to avoid the suspicion of this being in some way performed by herself, the lady knelt on the chair in such manner that its four feet were visible to us. It then rose about three inches, remained suspended for about ten seconds, and then slowly descended. At another time two children, on separate occasions, rose from the floor with their chairs, in full daylight, under (to me) most satisfactory conditions; for I was kneeling and keeping close watch upon the feet of the chair, and observing that no one might touch them" (p. 85).