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ni ball of dest ed od A January 25, 1926. Dr. F. B. Flinn, 437 Weat 59th Street, Columbia University, New York City. Dear Dr. Flinn: Attached I an sending you the notes on the pigs examined two and three weeks after the injection of radium solutions. Also notes relative to members of the thorium and radivm aeries. I trust that these notes are clear and give you the information you desire. I do not find a copy of the work I mentioned to you hich wag Tone in Paris, but have raked Nr. Vielt to send you one. Very tr.ly H. H. Barker.