The William H. Howell Collection spans his entire career. Series include correspondence (1897-1937), laboratory notebooks (1907-1935), reprints (1884-1945), manuscripts, bibliographies, and research notes. Memorabilia include diplomas, certificates, and Howell's academic cap and gown. The collection is a resource for studying the development of physiology at Johns Hopkins. Additional original material pertaining to Howell can be found in correspondence of the Office of the Dean from both the school of medicine and the school of hygiene.