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October 27, ,1930. Dr. Horman Schlundt, University of Missouri, Columbla, Mo. Dear De. Schlundt: Your letter of October 2nd, enclosing a negative obtained by exposing for 52 days awo specimen of Mrs. MacDonald's bone - nanely, vertebra and humerus, has been received. I think your deduction that from the photo- graphic effect the vertebra is more activo than the humerus, secms unquestionable, and Beems to bear out your quantitative determinations. However, I would be inclined to place more dependability upon the emanation detormination than upon the photographic effects. Sincerely yours, Vice President. HHBarker*R