Spiritualism - from our story 'Spirit Photography In 1920s England: When William Hope Conned Arthur Conan Doyle'

A strange substance, identified as ectoplasm, emerges from the mouth of medium Marthe Beraud (aka Eva C) during a seance, circa 1910. Picture taken from 'Les Phenomenes dits de Materialisation' by Juliette Bisson. (Photo by Hulton Archive/Getty Images)

A strange substance, identified as ectoplasm, emerges from the mouth of medium Marthe Beraud (aka Eva C) during a seance, circa 1910. Picture taken from 'Les Phenomenes dits de Materialisation' by Juliette Bisson. (Photo by Hulton Archive/Getty Images)

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