If the hands of these boys were tied close against the side of their cabinet, the ropes passing through holes and fastened on the outside, I think "the spirits" would always fail to work. Dr. W. F. Van Vleck, of Ohio, to whom I am indebted for some of the facts contained in this chapter, can beat the Davenport brothers at their own game. In order that he might the better learn the various methods pursued by the professed "mediums" in deceiving the public, Dr. Van Vleck entered into the medium-business himself, and by establishing confidential relations with those of the profession whose acquaintance he made, he became duly qualified to expose them. He was accepted and indorsed by leading spiritualists in different parts of the country, as a good medium, who performed the most remarkable spiritual wonders. As the worthy doctor practiced this innocent deception on the professed mediums solely in order that he might thus be able to expose their blasphemous impositions, the public will scarcely dispute that in this case the end justified the means. I suppose it is not possible for any professed medium to puzzle or deceive the doctor. He is up to all their "dodges," because he has learned in their school. Mediums always insist upon certain conditions, and those conditions are just such as will best enable them to deceive the senses and pervert the judgment. Anderson "the Wizard of the North," and other conjurers in England, gave the Davenports battle, but the "prestidigitators" did not reap many laurels. Conjurers are no more likely to understand the tricks of the mediums than any other person is. Before a trick can be exposed it must be learned. Dr. Van Vleck, having learned "the ropes," is competent to expose them; and he is doing it in many interesting public lectures and illustrations. If the Davenports were exhibiting simply as jugglers, I might admire their dexterity, and have nothing to say against them; but when they presumptuously pretend to deal in "things spiritual," I consider it my duty, while treating of humbugs, to do this much at least in exposing them. CHAPTER X. THE SPIRIT-RAPPING AND MEDIUM HUMBUGS.--THEIR ORIGIN.--HOW THE THING IS DONE.--$500 REWARD.