Series contains correspondence, notes, reports, and grant information. Forbus was convinced that Hodgkin's disease, because of its granulomatous component, was a reaction to injury by an infectious agent. He conducted research in the 1930s and 1940s by soliciting case-based data from other medical institutions; a method well documented in the correspondence of this series. A subject matter expert, he presented multiple lectures on the topic text of which are found in the Manuscripts, Addresses, Speeches, Lectures series in this collection. Forbus' interest in the subject continued through his professional life. Hodgkin's disease and brucella references can be found throughout the collection. Materials date from 1931 to 1957.