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William J. Crawford describes his investigations of the physical manifestations reported at the Goligher circle in Belfast. This final volume concentrates on the structures and processes he believed were involved in the observed phenomena.
The experiments include photographic records, contact impressions and tests using materials such as clay and methylene blue. Tables and illustrations accompany the descriptions of apparatus and procedure. Published in 1921 with a prefatory note by David Gow, the original scan preserves the complete edition and its illustrations.