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August 12, 1937 Dr. G. Failla, Central Park Test at 106th Ste, New York, N.Y. Dear Dr. Failla: Wie are sending you herewith by messenger 10.5 grams of U.S. free enanating compound which contains ap- proximately 10.5 milligrans of radiun element. This amount of radium represents the recovery from the two needles which you sent to our laboratories somo time ago containing 4.81 milligrems and 7.04 milligrans radium eloment respectively. shall be interested in hearing about the out- come of your experiments to determine the usability of free emanating compound as a substitute for the ordinary aqueous solutions now used in radon collection apparatus. With krind regards, I ame Sincerely yours, Vice=President eno