Subject(s): Muller, Hermann Joseph; Sturtevant, Alfred Henry; Population genetics; Biographical and personal data; Statistics, biostatistics, biometrics; Drosophila genetics; Physiology; Evolution; Publication; World War II -- Impact on science; Demerec, Milislav; Travel -- Brazil; Epling, Carl; Conferences and symposia; Wallace, Bruce; Teaching; Genetics -- Guinea pigs; Cold Spring Harbor Laboratory; Travel -- Invitations, arrangements; Congratulations, greetings, thanks -- Presidential medal; Columbia University; Unpublished manuscripts, notes, etc.