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DEPARTMENT OF PATHOLOGY CORNELL UNIVERSITY MEDICAL COLLEGE MAR 111929 FIRST AVENUE AND 28TH STREET NEW YORK March 11, 1929. Mr. H.H. Barker, United States Radium Corporation, 535 Pearl Street, New York City. My dear Mr. Barker: Dr. Craver and I fully approve of the examination of the fecal residues for radium content, and suggest that you request Dr. Schlundt to proceed as rapidly as possible. Sincerely yours, Juning James Ewing.