The Royal Society, that learned body which for ages has constituted the best tribunal to which Britain can appeal in questions of science, accepted Mr. Perkins's Tractors and the book written about them, passed the customary vote of thanks, and never thought of troubling itself further in the investigation of pretensions of such an aspect. It is not to be denied that a considerable number of physicians did avow themselves advocates of the new practice; but out of the whole catalogue of those who were publicly proclaimed as such, no one has ever been known, so far as I am aware, to the scientific world, except in connection with the short-lived notoriety of Perkinism. Who were the people, then, to whose activity, influence, or standing with the community was owing all the temporary excitement produced by the Metallic Tractors? First, those persons who had been induced to purchase a pair of Tractors. These little bits of brass and iron, the intrinsic value of which might, perhaps, amount to ninepence, were sold at five guineas a pair! A man who has paid twenty-five dollars for his whistle is apt to blow it louder and longer than other people. So it appeared that when the “Perkinean Society” applied to the possessors of Tractors in the metropolis to concur in the establishment of a public institution for the use of these instruments upon the poor, “it was found that only five out of above a hundred objected to subscribe, on account of their want of confidence in the efficacy of the practice; and these,” the committee observes, “there is reason to believe, never gave them a fair trial, probably never used them in more than one case, and that perhaps a case in which the Tractors had never been recommended as serviceable.” “Purchasers of the Tractors,” said one of their ardent advocates, “would be among the last to approve of them if they had reason to suppose themselves defrauded of five guineas.” He forgot poor Moses, with his “gross of green spectacles, with silver rims and shagreen cases.” “Dear mother,” cried the boy, “why won't you listen to reason? I had them a dead bargain, or I should not have bought them. The silver rims alone will sell for double the money.”