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investigations, he haunted gibbets and charnel-houses, braving the fires of the Inquisition and the virus of the plague. First of all men he began to place the science of human anatomy on its solid modern foundations--on careful examination and observation of the human body: this was his first great sin, and it was soon aggravated by one considered even greater. Perhaps the most unfortunate thing that has ever been done for Christianity is the tying it to forms of science which are doomed and gradually sinking. Just as, in the time of Roger Bacon, excellent men devoted all their energies to binding Christianity to Aristotle; just as, in the time of Reuchlin and Erasmus, they insisted on binding Christianity to Thomas Aquinas; so, in the time of Vesalius, such men made every effort to link Christianity to Galen. The cry has been the same in all ages; it is the same which we hear in this age for curbing scientific studies: the cry for what is called "sound learning." Whether standing for Aristotle against Bacon, or for Aquinas against Erasmus, or for Galen against Vesalius, the cry is always for "sound learning": the idea always has been that the older studies are "SAFE." At twenty-eight years of age Vesalius gave to the world his great work on human anatomy. With it ended the old and began the new; its researches, by their thoroughness, were a triumph of science; its illustrations, by their fidelity, were a triumph of art. To shield himself, as far as possible, in the battle which he foresaw must come, Vesalius dedicated the work to the Emperor Charles V, and in his preface he argues for his method, and against the parrot repetitions of the mediaeval text-books; he also condemns the wretched anatomical preparations and specimens made by physicians who utterly refused to