He was born in May 1734, at Mersburg, in Swabia, and studied medicine at the University of Vienna. He took his degrees in 1766, and chose the influence of the planets on the human body as the subject of his inaugural dissertation. Having treated the matter quite in the style of the old astrological physicians, he was exposed to some ridicule both then and afterwards. Even at this early period some faint ideas of his great theory were germinating in his mind. He maintained in his dissertation “that the sun, moon, and fixed stars mutually affect each other in their orbits; that they cause and direct in our earth a flux and reflux not only in the sea, but in the atmosphere, and affect in a similar manner all organised bodies through the medium of a subtile and mobile fluid, which pervades the universe, and associates all things together in mutual intercourse and harmony.” This influence, he said, was particularly exercised on the nervous system, and produced two states, which he called intension and remission, which seemed to him to account for the different periodical revolutions observable in several maladies. When in after-life he met with Father Hell, he was confirmed by that person’s observations in the truth of many of his own ideas. Having caused Hell to make him some magnetic plates, he determined to try experiments with them himself for his further satisfaction.
He tried accordingly, and was astonished at his success. The faith of their wearers operated wonders with the metallic plates. Mesmer made due reports to Father Hell of all he had done, and the latter published them as the results of his own happy invention, and speaking of Mesmer as a physician whom he had employed to work under him. Mesmer took offence at being thus treated, considering himself a far greater personage than Father Hell. He claimed the invention as his own, accused Hell of a breach of confidence, and stigmatised him as a mean person, anxious to turn the discoveries of others to his own account. Hell replied, and a very pretty quarrel was the result, which afforded small talk for months to the literati of Vienna. Hell ultimately gained the victory. Mesmer, nothing daunted, continued to promulgate his views till he stumbled at last upon the animal theory.