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COPY Dr. Frank Edward Simpson Dr. Roy Emmert Flesher Radium Therapy and Sicin Diseases 59 E Madison St. Cor.Wabash Ave. CHICAGO October 17,1925. Dr. Froderick N. Flinn, 437 West 59th St. 9 New York City. Dear Doctor Flinn: Replying to your letter of October 14th, I am much interested in your remarks and experiments. Replying directly to your question as to whether or not continuous exposure to such a small quantity or mesothorium or radium as would be contained in five milligrans of luminous peint would be harmful. I would say that it seems to me unlikely that serious effects either local or constitutional would be produced. I would suggest that you write to Dr. C. H. Viol. in care of the Radium Chemieal Company, Pittsburgh. Pa., who, I believe would be able to give you authentic information on this point. With best wishes, I am Yours vory truly, (signed) Frank E. Simpson