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August 29th, 1928. Dear Dr. Schlundt: I am sending you tro (2) specimens of sine for use in testing the gensitiveness of detecting small quantities of redon by meens of a sine sulphide screen- I would suggest that you examine both of these specimen carefully for any trace of self luminosity, prior to introducing any radion to detect its presence. You realise thege specimen of necessity have been around a redium laboratory, and while I feel confident that they do not contain any radio- active material, still there is always a possibility of contamina- tion. Cordially yours, HEBarker: RH