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March 3, 1947 Dr. F. B. Flinn, Columbia University, 15 Amsterdem Avenue, New York 23, N. Y. Dear Dr. Flinn:- Thanks very much for your letter of February 27th. Dr. Hess has also pointed out to us that several of the flasks used for air samples have recently shown evidence of contamination. We have suggested that he retain several flasks out of each shipment made to you and run tests on the evacuated flasks to determine which are contaminated. In the meantime, we have ordered eight additional flasks from the Scientific Glass Apparatus Company and these are to be shipped directly to your laboratory. No delivery date has as yet been obtained, but we would expect these flasks to be delivared within the next four to six weeks. Very truly yours, Ghief Chemist Chwallhausentrkh