The Robert W. Hegner collection consists of a travel diary written during a trip to Europe to observe Europeon institutes of science in special fields mostly in the basic sciences, a guestbook of the Department of Medical Zoology (1923-1927) and annual reports of the Department of Medical Zoology covering the period1920-1927. Of particular interest is a 12 page index of institutions he visited and individuals with whom he met during the 1920 trip. The travel diary covers the period May 19, 1920 to September 4, 1920 and includes pictures, post cards and descriptions of scientific laboratories and institutes in post World War I Europe.