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COPY MAYO GLILIC Rochester linn. June 11,1925. Dr. Frederick B. Flinn, 437 W. 59th St., New York City. Dear Dr. Flinn: Your letter of the 5th inst. is at hand. I am referring your question to Dr. Bowing for more detailed reference. It is true that we keep close watch of the technicians that are handling radium. However, in regard to the blood studies we have had no deviation from the normal of any of our people who are exposed to radium emanations. of course, that is the state of affairs that we alwgys hope to maintain. Dr. Bowing can give you further reference to various reports that could be used as controls in your studies. He also suggests that such effects might be due to poisoning with other substances used in the preparation in the "radio-Lite" dials rather than to the rays themselves. A3 any rate we shall both be glad to know the outcome of your study of this occupational disease. Yours very truly, (signed) A. H. Sanford.M.D