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June 14, 1935. Dr. G. Failla, Memorial Hospital, Central Pk, W. & 106th St., New York Gity. Dear Dr. Failla: lias glad to have your letter of April 15th ad- vising that you anticipated getting started on the apparatus for using free emanating compound for a source of radon. In- asmach as our arrangement with Dr. Hahn was to the effect that tre vergengaged in experimental work on this material which might require the balance of the year before any indication of results could be hoped for, we feel thot it is desirable that something be accomplished, if possible, before late Fall. I realize that you are very basy, and know that ay time is well occupied. Nevertheless, I hope you can sandwich this work in soine way. With kind regards, I am, Sincerely yours, HHBarkertD Vice-President