A FINE COPY. "In 1645 the Royal College of Physicians assigned to Glisson, Bate and Regemorter the task of writing a book on rickets -- one of the earliest instances of collaborative research in England. Six years later they published De rachitide, which, though not the first, was the fullest and most important account of rickets that had yet appeared. Glisson's investigation of the essential nature of the disease so impressed his fellow workers that they allowed him to draft the entire book, which combined the observations of the three principal investigators with those of five other contributors" (Norman).