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HARVARD UNIVERSITY 2xC16 SCHOOL OF PUBLIC HEALTH ev DEPARTMENT OF PHYSIOLOGY 55 VAN DYKE STREET BOSTON, MASSACHUSETTS Mr. Arthur Roeder, 0 is July 18, 1924. United States Radium Corporation 30 Church Street, New York City. RADIUN CORTS UNITED STATES My dear Mr. Roeder: I think you can be sure that there is no doubt about the qualitative tests we have made since we were fortunate in having access to exceedingly effective apparatus for this purpose. I should be glad to have any references on radium which you locate, but I imagine it will be hard to furnish us with anything in regard to animals which we have not covered. This may sound reckless, but there were three of us at work. We did little else for a considerable period of time and we had access to the large bibliography compiled by the Cancer Commission here in the Medical School. Very sincerely yours, beil Id. Dunhes Cecil K. Drinker, M.D.