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Jenuary 15,1927. Dr. B. Flinn, College of Physicians and Surgeons, Columbia University, 437 w. 59th St. N.Y.C. Dear Dr. Flinn: I have exemined the stool you handed me several days a,go and find that it is slightly active. Inasmuch as it is rather difficult to interpret alpha rey deterninations in a concrete manner I will give you the readings as recorded: N.L. 60-40 91 10 Specimen 60-40 8¹ 0" You will note that this is not nearly as active se the last stool, which we examined of Viss Dunn's, although I will may that it definitely shows that radio-active material is being elminiated. Vory truly yours, Vice President. HHBarker :RH