The Book of Forbidden Knowledge - Unknown - The Book of Forbidden Knowledge is a small pamphlet about certain aspects of the occult. Popular in the late nineteenth and early twentieth centuries, these short manuscripts were published as a result of the interest in things such as spiritualism and mesmerism. This one is a mixture of folklore, superstitions, omens, and spells and includes information on subjects such as oracles, divination, mesmerism, spiritism, talismans, charms, incantations, and dreams.