No one appears on the horizon in American medicine to take the place of John Fulton. Perhaps no one will. In the literal sense he is irreplaceable. For some time I have had on my shelf of books, working itself into the gerundive position of those I am about to read, and at length have finished Fulton's study in humanism entitled The Great Medical Bibliographers. It was published by the University of Pennsylvania Press in 1951 and dedicated to the memory of Conrad Gesner, Albrecht von Haller, and John Shaw Billings. What a triumvirate! Anyone with interest in scholarship, in medicine, and in books ultimately comes to know something of great private collectors and private collections of books, as well as great or even meager libraries which ultimately become their repositories. This is true even when collections are shuffled and redealt by dealers or must be dissolved by importunate survivors.