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HARVARD UNIVERSITY SCHOOL OF PUBLIC HEALTH DEPARTMENT OF PHYSIOLOGY 55 VAN DYKE STREET BOSTON, MASSACHUSETTS April 13, 1925 Mr. Arthur Roeder, United States Radium Corporation, 30 Church Street, New York City. Dear Mr. Roeder: The material from the Life Extension Institute was sent to Mr. Viedt by us by registered mail on June 11, 1924, and a note, 8. copy of which is enclosed, was mailed on the same day. Very sincerely yours, Galk Dumber Cecil K. Drinker, M.D.