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September 24th,1928. Dr. Herman Schlundt, University of Missouri, Room 110 New Chemistry Bldg., Columbus, Mo. Dear Dr. Schlundt: Under separate cover I am sending you one spinthariscope manufactured by the Palmer Radium Laboratories, and two spinthariscopes without the radium or zinc sulphide, for use in testing expired air by the scintillation method. I em in hopes that you have located some zine sulphide which is naturally free from any contemination by radio-active products, and that you will be able to coat the base of these two devices with this material. The prepared spinthariscope and one of the others you may keep for your experiments, returning the other to us. Very truly your S, Vice President. bHBarker :RH