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HARVARD UNIVERSITY SCHOOL OF PUBLIC HEALTH 55 VAN DYKE STREET DEPARTMENT OF PHYSIOLOGY BOSTON, MASSACHUSETTS May 12, 1924. Mr. H. B. Viedt, United States Radium Corporation, 422 Alden Street, Orange, N. J. Dear Mr. Viedt: I should like you to send me the remaining dental X-ray films on Thursday, May 15. Please take care when you collect these and put them into an envelope that they are not brought into the neighborhood of any radium -- that is, that they leave the plant without being exposed to anything but the environment in which we requested they should be placed. Very sincerely yours, Cecil Id. Dimite Cecil K. Drinker, M.D.