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August 31, 1927. Mr. Josiah Stryker, Lindabury, Depue and Faulks, Prudential Building, Newark, New Jersey. Dear Mr . Stryker: I am herewith attaching a few notes on radio-activity and mesothorium. These notes touch the high spots of the subject, and I trust 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 book is gemi-technical, still it presents the subject in as simple a way as it is possible to do. I hope 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:M VICK-PRESIDENT.