It was in preventive medicine particularly that {128} these progressive medical men of the early university days secured their triumphs. They made separate hospitals for the lepers all over Europe, and by segregation succeeded in wiping out that disease, though it was as widely spread as tuberculosis in our day and presented just as serious a problem. Indeed the most encouraging incentive for our present tuberculosis campaign is drawn by many authorities from the experience with leprosy, which was eventually obliterated as an endemic popular disease, by strict segregation methods. These same generations created special hospitals for erysipelas and thus prevented the spread of this disease in the ordinary hospitals, where it used to be so serious a factor for morbidity if not for mortality. Men forgot this later and the disease became a serious problem once more in all the hospitals of even a generation ago. The hospital organization worked out by these university men is the finest jewel in the crown of their accomplishment as applied scientists. Pope Innocent III, himself a University of Paris man, founded the Santo Spirito Hospital in Rome, summoning for that purpose the best authority on hospitals in Europe, Guy of Montpellier, and then required the bishops of the world to erect similar hospitals in their dioceses. This was done, and it is Virchow, whose sympathies were anything but favorable to the Popes, who has been most loud in his praise of the wonderful hospital organization of these centuries. Every town in {129} Europe of 5,000 inhabitants or more had a hospital, and there were hospitals in many of the smaller towns.