This was the spirit that died out when the Greek world decayed, and Europe fell a victim to ignorance and superstition. Then came the heyday of miraculous images, of relics with power to cure, of pilgrimages, of intercessions, of all that mental degradation which the Mediæval Church, far from repudiating, used for its own purposes. And so the resurrection of medical science was connected with rebellion against the Church. Among every three physicians, are two atheists, was the word, and even the pious Stearne, whom I have mentioned, preaches a purely Stoic creed, and systematically ignores all the rites of his church. Hippocrates and his school had in their day to combat similar superstitions, just as the scientific medicine of our day has to deal with Lourdes and with Christian Science. Within the last few years, we have recovered from oblivion the ruins of the temple and town of Epidauros, where the god Æsculapius had a famous shrine, and where hundreds of pilgrims assembled to seek cures for their several ailments. Their recreation was as well looked after as in any modern watering-place; the theatre was the most splendid thing of the kind in Greece, and there were porticoes, and baths, and groves to secure that comfort and idle amusement which have a great effect on health. But as we know from the ridicule of Aristophanes, corroborated by numbers of inscriptions commemorating cures, the method of these Asklepiads was far behind those of Kos; it was superstitious and not scientific. Dreams and omens, charms and ceremonial acts still stood in the way of sound hygiene and careful clinical observation. Not that I deny the occurrence of cures under such treatment. The most sceptical examination of the annals of Lourdes shows that mental influences will cure not only mental diseases, and diseases known as nervous, but even those that seemed absolutely physical. And what the Blessed Virgin does for the faithful of Lourdes may doubtless be done by the influence of more human and tangible causes. These admissions, which I make freely, will not change the opinion now held by every true man of science. It is the opinion of Hippocrates and his school, and that which he sought to enforce by his theory and his practice. The great truth that work is what exhausts the human frame, and that food supplies this waste, was laid down clearly in their practice. The equally important principle, that no organ will keep in health and vigour without exercise of its natural function and that if disused it will shrink or decay, was also clearly pronounced. They even guessed that the greatest problem of medicine (which they failed to solve) was the passage from inorganic into organic substances.