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UNIVERSITY OF MISSOURI COLUMBIA DEPARTMENT OF CHEMISTRY February 18, 1930 Mr. H. H. Barker U. S. Radium Corporation FEB 201930 535 Pearl Street New York City, N.Y. My dear Howard: I hope that you will be kind enough to furnish us gratis a small sample of high grade phos- phorescent zine sulphide------a sample which contains practically no radium. I would like to have this sample for Mr. Wahl who is still far from being able to approach Mr. o Hammer 's sample of phosphorescent zine sulphide. With very good wishes I remain Yours very truly, Herman Schlundt. HS/GMA. P.S. On Thursday of this week I e.m. to give a Sigma Xi lecture at Lawrence, Kansas. will send on two suggestions for exhibit to court or J sury.