 If much of Sidgwick’s psychical research today looks rather gullible, it must be allowed that his positive conclusions were always very cautious and guarded, and that his work in fact had an overwhelmingly negative, destructive effect, akin to that of recent debunkers of parapsychology. The Sidgwick Group exposed one fraud after another, including the fraudulent claims of Madame Blavatsky and the Theosophical movement, though Theosophists continue to dispute this. Indeed, Theosophy remains an influential “New Age” form of the esoteric spiritualism that Sidgwick found attractive (given its concern with the common mystical core of all religions) but impossible to defend (Oppenheim 1985). Insofar as parapsychology has ever enjoyed any standing as a rigorous field of scientific inquiry, this is thanks to the efforts of Sidgwick. Furthermore, the work of the Sidgwick Group helped pave the way for much of the developing research in depth psychology generally, calling attention to the efforts of Freud, Charcot, Richet and many others whose names are not primarily associated with parapsychology (Gauld 1968, 2007).