According to St. Augustine all diseases of Christians are to be ascribed to these demons and the church fathers generally agreed with these two, the greatest of them all. It was, therefore, sinful to do anything but trust to the intercession of the saints. The objection of the Church to dissection which is, of course, the indispensable basis for any real knowledge of anatomy was very slowly worn down. The story of Andreas Vesalius whom Andrew White calls the founder of the modern science of anatomy is at once fascinating and illuminating. He pursued his studies under incredible difficulties and perhaps could never have carried them through without the protection of Charles V whose physician he was. He was finally driven out, a wanderer in quest of truth, was shipwrecked on a pilgrimage to the Holy Land and in the prime of his life and strength "he was lost to the world." But he had, none the less, won his fight and the opposition of the Church to the scientific study of anatomy was gradually withdrawn. But every marked advance in medical science had really to fight the battle over again. The Sorbonne condemned inoculation, vaccination had slowly to fight its way and even the discovery of anesthetic, perhaps the greatest single blessing ever given surgery, met with no little theological obstruction. It is only fair to say in this connection that so stupid a conservatism has been by no means the sole possession of the Church and the clergy. Medicine has been upon occasion almost as conservative and the difficulties which Sir Joseph Lister encountered in his endeavour to win the London hospitals for asepsis and anti-sepsis were quite as bitter. The difficulties were of a piece with the opposition of the Church to scientific advancement. After all a conservatism of this sort is a matter of temperament rather than creed or class. But if the Church was strangely slow to give place to medicine and surgery, the Church sought, through agencies and methods of its own, to cure disease. It is impossible to follow through in detail the long story though it all bears upon the line we are following through its massive testimony to the power of mind over body. Since the Church believed in demon possession it sought to cure by exorcism and there are in the ritual of the Church, as the ritual has finally taken form, offices growing out of this long, long battle against evil spirits which have now little suggestion of their original purpose. The sign of the Cross was supposed to have commanding power, the invocation of the triune deity had its own virtue, the very breathing of the priest was supposed to influence the evil spirit and he fled defeated from the touch of holy water.