Franz Anton Mesmer (ˈmɛzmər; ˈmɛsmɐ; 23 May 1734 – 5 March 1815) was a German physician with an interest in astronomy. He theorised the existence of a natural energy transference occurring between all animated and inanimate objects; this he called "animal magnetism", sometimes later referred to as mesmerism. Mesmer's theory attracted a wide following between about 1780 and 1850, and continued to have some influence until the end of the 19th century. In 1843, the Scottish doctor James Braid proposed the term "hypnotism" for a technique derived from animal magnetism; today the word "mesmerism" generally functions as a synonym of "hypnosis". Mesmer also supported the arts, specifically music; he was on friendly terms with Haydn and Mozart.
Mesmer was born in the village of Iznang (now part of the municipality of Moos), on the shore of Lake Constance in Swabia. He was a son of master forester Anton Mesmer (1701—after 1747) and his wife, Maria Ursula (née Michel; 1701–1770). After studying at the Jesuit universities of Dillingen and Ingolstadt, he took up the study of medicine at the University of Vienna in 1759. In 1766 he published a doctoral dissertation with the Latin title De planetarum influxu in corpus humanum (On the Influence of the Planets on the Human Body), which discussed the influence of the moon and the planets on the human body and on disease. This was not medical astrology.
Building largely on Isaac Newton's theory of the tides, Mesmer expounded on certain tides in the human body that might be accounted for by the movements of the sun and moon. Evidence assembled by Frank A. Pattie suggests that Mesmer plagiarized most of his dissertation from other works, including De imperio solis ac lunae in corpora humana et morbis inde oriundis (1704) by Richard Mead, an eminent English physician and Newton's friend. However, in Mesmer's day doctoral theses were not expected to be original.
In January 1768, Mesmer married Anna Maria von Posch, a wealthy widow, and established himself as a doctor in Vienna.
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