The quantity and quality of the information concerning leper hospitals which he collected and embodied in his memoir, contributed to the Edinburgh Medico-Chirurgical Society in March, 1841, was phenomenal. He had consulted old manuscripts and registers, monastic chronicles, burgh records, and Acts of Parliament, as well as works of antiquity, travel, and history. He gave close upon five hundred references, as well as a list of one hundred and nineteen leper-houses, whose existence in Britain and whose history he had traced. The work illustrates the objects and proper methods of antiquarian research, which twenty years afterwards he dilated upon in his address from the Chair of the Scottish Society of Antiquaries. In the course of it he pointed out how vigorously our ancestors had set to work to stamp out the disease when it spread through Europe during the period from the tenth to the sixteenth century. The method adopted was that still employed--segregation; about the twelfth century scarcely a town or burgh in France and Britain was without its leper-hospital. Although we in Britain are happily now freed from its ravages, other parts of the world are not so fortunate. It is still regarded popularly as an incurable disease, as it was in 1597, when one Catherine Livingstone was gravely brought to trial for witchcraft, one instance of which had been that she dared to state her ability to cure "leprosie, which the maist expert men in medicine are not abil to do." The indictment set forth that she "took a reid cock, slew it, baked a bannock with the blude of it, and gaf the samyn to the leper to eat." The witch's remedy is scarcely more curious and certainly no less useful than those recommended two centuries later by John Wesley in his "Primitive Physic," where, moreover, he cheerfully, if somewhat too briefly to satisfy the modern inquirer, reports the cure "of a most desperate case" by the drinking of a half-pint of celery-whey morning and evening. Scotland was severely smitten by leprosy in the centuries when it overspread Europe; Robert Bruce fell a victim to it in 1339, and the disease seems to have lingered in the North after it had almost vanished from England.