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August 31, 1927. Mr. Edward A. Markley, Collins & Corbin, Jersey City, New Jersey. Dear Mr. Markley: I am herewith attaching a few notes on radio-activity and mesothorium. These notes touch the high spots of the subject, and I trost that they will satisfactorily serve your purpose. I would suggest that in connection with these notes you read Soddy's "Interpretation of Radium". = While this beok is semi-technical, still it presents the subject in as simple a way as it is possible to do. I hone in the course of the next few days to be able to go over the information published relative to the hazards connected with the radium situation. Very truly yours, HHBarker: MB VICK-PRESIDENT.