Here in America we had a similar experience, though ours had science as the basis of the superstition in the case instead of religion. The interest aroused by Galvani's experience with the twitching of frogs' legs when exposed nerve and muscle were touched by different metals led Doctor Elisha Perkins to invent a pair of tractors which would presumedly apply Galvani's discovery to therapeutics. These were just plain pieces of metal four or five inches long, shaped more or less like a lead pencil and tapering to a blunt point. With these, as Thatcher, one of our earlier historians of medicine, tells us, Perkins succeeded in curing all sorts of ailments, but particularly many different kinds of painful conditions. He was most successful in the treatment of "pains in the head, face, teeth, breast, side, stomach, back, rheumatism and so forth." In a word, he cured the neuralgias and the rheumatic pains and the chronic {249} rheumatisms which are the source of so much trouble--and especially complaint--for the old, and which so often physicians, in any time of the world's history, have been unable to cure. For a time his success was supposed to be due to some curious electrical power that he was using. Learned pamphlets were issued to show that animal magnetism or animal electricity or Galvanism was at work. Professors at no less than three universities in America gave attestations in favor of its efficacy. Time has of course shown that there was absolutely no physical influence of any kind at work. The only appeal was to the mind. Elisha Perkins was a Yale man of education and impressive personality, "possessing by nature uncommon endowments both bodily and mental ", and he succeeded in impressing on his patients the idea that they would surely be cured; he thus overcame the dreads, released the will power, gave new hope and a tonic stimulus to appetite, created a desire for exercise, and then the will kept this up and before long the patient was cured.