John Cantacuzenos, Byzantine emperor, whose own son died of it, left a description that entirely fits in with our modern knowledge of plague, buboes, black spots and all, though there is a certain resemblance to Thucydides which makes one rather believe that he was adding to his narrative for dramatic effect. Strangely modern is his description of the dull stupor that affects so many plague patients to-day. We all noticed it in the slight epidemic that affected Sydney some years ago. Then again John specially stated that some patients were attacked by a violent pain in the chest, with difficulty of breathing and a putrid expectoration. This looks uncommonly like the pneumonic type of plague which proved so destructive in Manchuria in 1910. But the most interesting feature of the Black Death was its attack upon Avignon, where Guy de Chauliac was physician to the pope. It lasted eight months, with the usual concomitants of numbers of dead so huge that the living could not bury them. As trench after trench became filled, no matter how hard the living worked, the pope blessed the Rhone and had the bodies hurled into that rushing stream, doubtless to the joy of the rats. Guy himself showed the courage that one expects in a modern doctor, and has left us a perfectly recognisable description, which is commented upon by both Dr. Hecker and Dr. Crawfurd. It is in Guy himself that our interest dwells; for at last Medicine had found its soul. His colleagues, being trained in Arabian medicine, all told him that the plague was inevitably fatal, that medicine could do nothing, and that he was only courting destruction by staying to comfort those whom he knew that he could not save. Guy himself had a theory that strong purgation would cure the disease, though he knew that the only real safety was in flight. He stayed; though whether he was prevented from running by the medicines that he prescribed or by sheer courage no one can say. His own words were “As for me I did not dare absent myself, though I was in constant fear.” To be feared of a thing and yet to do it—that is what makes the prettiest kind of a man; and to be afraid only of his own conscience makes a man a hero. Guy was afraid of his own conscience, not of the plague, and therefore he has become one of the heroes of medicine. No doubt he donned his quaint mediæval anti-infection costume with its beaky vizor, and went from door to door trying to bring a little hope to the gloomy death-beds of the frightened people; no doubt he had himself to clean up the mess caused by his treatment, which must have been calamitous. But he lives in the memory of his colleagues, for we are all proud to belong to the profession of that simple-minded doctor of Provence, and try to act like him though with less messy treatment. He was a brave man.