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HARVARD UNIVERSITY SCHOOL OF PUBLIC HEALTH 55 VAN DYKE STREET DEPARTMENT OF PHYSIOLOGY BOSTON, MASSACHUSETTS March 19, , 1924 COFIVED MAR 20 1924 Mr. A. Roeder, United States Radium Corporation, 30 Church Street, New York City. UNITED STATES My dear Mr. Roeder: RADIUM CORP. I thank you for your note of March 17, and will let you know as soon as I can just when I shall be able to make the trip to your plant. Very truly yours, Cecil K. Drinker, M.D. P.S. The samples of "H" undark and zine sulphide reached me yesterday.