The Christian A. Herter Collection spans his entire career, and consists primarily of Herter's correspondence. Prominent correspondents include Paul Ehrlich, William Osler, and William H. Welch. There is a large body of correspondence concerning Herter's benzoate paper of 1910. Also included are materials and correspondence related to Herter's research on Louis Pasteur, including an unpublished manuscript Louis Pasteur and His Service to Mankind. In addition to Herter's correspondence, there are several files of correspondence between H. D. Dakin and other medical professionals. Dakin had worked with Herter in his private laboratory before serving overseas during World War I. Upon his return to the United States, Dakin married Herter's widow, moved the laboratory to Scarsdale, and continued the research Herter had left unfinished at his death. The collection is a resource for studying the development of the field of biological chemistry.