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William J. Crawford reports experiments concerning levitation, contact phenomena and the direct voice. Continuing the work described in his earlier book on psychic phenomena, he gives particular attention to apparatus, measurements and the conditions of the sittings.
The chapters describe tests carried out with the Goligher circle and discuss the mechanical explanations Crawford proposed for the observations. Photographs and diagrams accompany the experimental accounts. This complete 1919 edition retains its original pages, illustrations and prefatory material.