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Gambier Bolton describes a series of investigations into reported materializations, concentrating on the conditions under which apparently solid forms were said to appear. He sets out a working hypothesis and explains the arrangements used by the research circles whose records inform the book.
Separate sections consider precautions against fraud, particular tests and questions put to the investigator. An appendix extends the discussion to the substance associated with materialization reports. First published in 1914, the work is presented in its complete third impression of 1919, retaining the original plan and supporting material.