In 1775 he published an account of the medical powers of this animal magnetism, which from his name was afterward called _mesmerism_. Paris was then the centre of attraction for scientific discoverers and pretenders. Thither Mesmer betook himself and there he soon created a lively sensation by the exhibition of mesmeric trances, some of which were accompanied by clairvoyance--that is, the power of seeing objects concealed from the eyes. He was also supposed to work some inexplicable cures. The secret of his art he could not be induced to reveal even for the sum of 340,000 livres, which was offered him in compensation. People began to doubt whether he had a real secret, or whether he was a rank impostor. A royal commission was appointed to examine into the matter. Our Benjamin Franklin, then in Paris, was one of the commissioners. Their report was unfavorable. They found no proof of the existence of a fluid such as animal magnetism, and thought that all that was not imposture could be accounted for by the power of imagination. In a secret report they pointed out very strongly the dangers likely to arise from this unhealthy stimulus to the imagination. Their verdict does honor to their learning and their common-sense. Mesmer left Paris, and he died in obscurity in 1815. But his pretended discovery did not die with him. It was a mine of resources to charlatans and impostors generally. There were strange effects produced, and at the sight of the inexplicable men lose their wits. The gullible public wondered, restless minds experimented, and many pondered thoughtfully on facts, most of which were not facts at all. But after eliminating all the elements of imposture and exaggeration there seemed to remain a residue of phenomena that were strange and unaccountable. II. THEORY OF HYPNOTISM.