Following some 37 years of service in geophysical fields, Harry Durward Harradon died unexpectedly of coronary thrombosis on December 8, 1949, shortly after his 66th birthday. On September 30, 1949, he was retired with honor from his post as Librarian, Translator, and Editor with the Department of Terrestrial Magnetism of the Carnegie Institution. He had intended to devote the last phase of his life to further linguistic and geophysical studies, trammeled by official responsibilities. His death, just as he and his wife had begun a winter vacation at St. Petersburg, Florida, deprives his colleagues of the help of one whose interest and many national and international contacts might have been expected to continue for some years.