Dr. Elisha Perkins was born at Norwich, Connecticut, in the year 1740. He had practiced his profession with a good local reputation for many years, when he fell upon a course of experiments, as it is related, which led to his great discovery. He conceived the idea that metallic substances might have the effect of removing diseases, if applied in a certain manner; a notion probably suggested by the then recent experiments of Galvani, in which muscular contractions were found to be produced by the contact of two metals with the living fiber. It was in 1796 that Perkins' discovery was promulgated in the shape of the Metallic Tractors, two pieces of metal, one apparently iron and the other brass, about three inches long, blunt at one end and pointed at the other. These instruments were applied for the cure of different complaints, such as rheumatism, local pains, inflammations, and even tumors, by drawing them over the affected parts very lightly for about twenty minutes. Dr. Perkins took out a patent for his discovery, and traveled about the country to diffuse the new practice. [Footnote 5: (Transcriber: This footnote is not numbered in the text but appears to refer to the preceding paragraph.): In one of Plautus' plays there is a curiously interesting expression that is recalled by this subject. The dramatist described one of his characters, Sosia, as thrown into a sleep by the manipulations of Mercury. These manipulations are described as _tractim tangere_--that is, to touch strokingly. It would remind one very much of Perkins' Tractors, and in this regard the fact that Mercury was to the Romans, besides being the messenger of the gods, the divinity of thieves, seems not without interest.] Just what the tractors were composed of may be found in the description of them filed with an application for a patent in the Rolls Chapel Office in London. They were not simply two different metals, but a combination of many metals, with even a little of the precious metals in them, partly because {49} of the appeal that this would make to the multitude, as chloride of gold did to our own generation, but doubtless mainly because the claim of precious metals entering into the composition enabled the inventor to sell his tractors at a better price. Dr. Holmes continues: