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350 Main Street, Orange, N. J. September 17, 1925. Dr. F. B. Flinn, 437 West 59th Street, Columbia University, New York City. My dear Dr. Flinn:- I am sending you hecewith the report on the specimens of organs of animals which have been treated with activated zine sulphide. As stated in my report, I regret that you did not include the organs of an animal not treated with zinc subphide, and 11 still convenient you might send me such at specimen. It is important that the specimen be treated in a manner similar to that hich the samples examined were treated. What disposition do you wish made of the semples I know have? With my kind regards, I am, Very truly yours, H. H. Barker.