Led on by the attractive nature of the study, I have extended my researches beyond the period of Greek and Roman antiquity; and have on hand the materials for a somewhat similar account of the pro fession among the Arabs of the East and West, among the Byzantine and Latin schools, and the monastic medical institutions 'of the middle ages; which I hope on some favorable occasion also to pre sent to the New York Academy of Medicine, to whom the present work is most respectfully in scribed.