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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE OFFICE OF MEDICAL OFFICER IN CHARGE APR 251930 Room 505, 45 Broadway, New York, N.Y. April 24, 1930. Mr. C. Lee, President, United States Radium Corporation, 535 Pearl Street, New York, N.Y. Sir: Would you please send me the composition of the luminous material which you sell for putting on dials? We need this in order to complete our in- vestigation of the radium dial painting industry. Would you also furnish us with a list of the firms to which you sell this material and, if possible, please send me about one gram of it. Very truly yours, Louis Schwartz Louis Schwartz, M.D., LS:B Surgeon, U.S.P.H.S.