The history of hypnosis is as ancient as that of sorcery, magic, and medicine; indeed, hypnosis has been used as a method in all three. Its scientific history began in the latter part of the 18th century with Franz Mesmer, a German physician who used hypnosis in the treatment of patients in Vienna and Paris. Because of his mistaken belief that hypnotism made use of an occult force (which he termed “animal magnetism”) that flowed through the hypnotist into the subject, Mesmer was soon discredited; but Mesmer’s method named mesmerism after its creator continued to interest medical practitioners. A number of clinicians made use of it without fully understanding its nature until the middle of the 19th century, when the English physician James Braid studied the phenomenon and coined the terms hypnotism and hypnosis, after the Greek god of sleep, Hypnos.