Correspondence, notes, lecture notes and lectures (1903-1908), and related material concerning zoological research, graduate work, field and laboratory work, teaching, academic appointments and departmental affairs, publications, and family and financial affairs. Includes correspondence of Zeleny with his brothers, particularly with John, a physicist, concerning university affairs and research; correspondence with other scientists concerning regeneration, experimental embryology, and heredity, and a biographical sketch (1944) of Zeleny. Correspondents include Charles B. Davenport, Carl H. Eigenmann, Frank E. Lutz, Thomas H. Morgan, and Edmund B. Wilson.