Of the second class, or Subjective Phenomena, we have "table-tilting and turning with contact; writing, drawing, etc., by means of the medium's hand; entrancement, trance-speaking, and impersonation by the medium of deceased persons, seeing spirits and visions and hearing phantom voices." From a general scientific point of view there are three ways of accounting for the physical phenomena of spiritualism: (1) Hallucination on the part of the observers; (2) Conjuring; (3) A force latent in the human personality capable of moving heavy objects without muscular contact, and of causing "Percussive Sounds" on table-tops, and raps upon walls and floors. Hallucination has unquestionably played a part in the séance-room, but here again the statement of the "Encyclopaedia Britannica" is worthy of consideration: "Sensory hallucination of several persons together who are not in a hypnotic state is a rare phenomenon, and therefore not a probable explanation." In my opinion, conjuring will account for seven-eighths of the so-called phenomena of professional mediums. For the balance of one-eighth, neither hallucination nor legerdemain are satisfactory explanation. Hundreds of credible witnesses have borne testimony to the fact of table-turning and tilting and the movements of heavy objects without muscular contact. That such a force exists is now beyond cavil, call it what you will, magnetic, nervous, or psychic. Count Agenor de Gasparin, in 1854, conducted a series of elaborate experiments in table-turning and tilting, in the presence of his family and a number of skeptical witnesses, and was highly successful. The experiments were made in the full light of day. The members of the circle joined hands and concentrated their minds upon the object to be moved. The Count published a work on the subject "Des Tables Tournantes," in which he stated that the movements of the table were due to a mental or nervous force emanating from the human personality. This psychic energy has been investigated by Professor Crookes and Professor Lodge, of London, and by Doctor Elliott Coues, of Washington, D. C., who calls it "Telekinesis." The existence of this force sufficiently explains such phenomena of the séance-room as are not attributable to hallucination and conjuring, thus removing the necessity for the hypothesis of spirit intervention. In explanation of table-turning by "contact," I quote what J. N. Maskelyne says in "The Supernatural":