PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Animal magnetism theory, 18th-century illustration. This artwork, titled 'The Insensible Perspiration', depicts the theory of animal magnetism advanced by English astrologer Ebenezer Sibly (1751-c.1799). He defined it as 'a sympathy which exists between the magnet and the insensible perspiration of the human body, whereby an aether, or universal effluvia, is made to pass and repass through the pores of the cuticle, in the same manner as the electrical fluid passes through bodies, and by which many cures are performed'. Artwork from Sibly's 'An universal system of natural history: including the natural history of man' (1794), a mixture of science and the occult.
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