One of the most dazzling and successful inventors in modern times, was Messmer, who commenced his career of medical knight-errantry at Vienna. His house was the focus of high life, the rendezvous of the gay, where the young and opulent were enlivened and entertained with continual concerts, routs, and illuminations. At a great expence, he imported into Germany the first _Harmonica_ from this country: he established cabinets of natural curiosities, and laboured constantly and secretly in his chemical laboratory; so that he acquired the reputation of being a great alchemist, a philosopher studiously employed in the most useful and important researches. In 1766, he first publicly announced the object and nature of his secret labours:--all his discoveries centered in the _magnet_, which, according to his hypothesis, was the best and safest remedy hitherto proposed against all diseases incident to the human body. This declaration of Messmer excited very general attention; the more so as about the same time he established a hospital in his own house, into which he admitted a number of patients _gratis_. Such disinterestedness procured, as might be expected, no small addition to his fame. He was, besides, fortunate in gaining over many celebrated physicians to his opinions, who lavished the greatest encomiums on his new art, and were instrumental in communicating to the public a number of successful experiments. This seems to have surpassed the expectations of Messmer, and induced him to extend his original plan further than it is likely he first intended. We find him soon after assuming a more dogmatical and mysterious air, when, for the purpose of shining exclusively, he appeared in the character of a _magician_:--his pride and egotism would brook neither equal nor competitor. The common loadstone, or mineral magnet, which is so well known, did not appear to him sufficiently important and mysterious--he contrived an unusual one, to the effect of which he gave the name of '_animal magnetism_'. After this, he proceeded to a still holder assumption, everywhere giving it out, that the inconceivable powers of this subtile fluid were centered in his own person. Now, the mona-drama began; and Messmer, at once the hero and chorus of the piece, performed his part in a masterly manner. He placed the most nervous, hysteric, and hypocondriac patients opposite to him; and by the sole act of stretching forth his finger, he made them feel the most violent shocks. The effects of this wonderful power excited universal astonishment; its activity and penetration being confirmed by unquestionable testimonies, from which it appeared, that blows similar to those given by a blunt iron, could be imparted by the operator, while he himself was separated by two doors, nay, even by thick walls. The very looks of this prince of jugglers had the power to excite painful cramps and twitches in his credulous and predisposed patients.