The Nelson C. Davis Collection will be of interest both to the historian of medical research and of medical education. The lecture notes and class papers prepared by Dr. Davis at all levels of his training have been preserved in this collection. Also included are drafts of papers, some of them unpublished, at various stages of preparation, reprints of his published articles, and a wide variety of supporting research materials (such as reprints and periodicals), many taken from Portuguese- or Spanish-language publications. A substantial portion of his laboratory diary (kept at Bahia from 1928 to 1933) can be found in this collection as well as a number of field notebooks and records of experiments. Personal correspondence, however, has been rather scantily preserved.