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OGT 22 1950 Cohumbia Unitrersity EPIDEMIOLOGY of and Sirgenns INDUSTRIAL HYGIENE 632 WEST 168m STREET, NEW YORK PUBLIC HEALTH ADMINISTRATION SANITARY SCIENCE INSTITUTE OF PUBLIC HEALTH Oct 21 1930 Mr. H. H. Barker, United States Radium Corp. New York City, N.Y. Dear Mr. Barker: I was very much interested in Dr. Lind's letter. It looks from Dr. Thompson's letter as if they are not going to discuss their results with any one until they have written their report. I am enclosing communications on the subject which are of course in confidence and will ask you to return when you have read them. Could I have ten grams more of the paint ? This will be the last I will need. Also are you using the gamma ray in- strument. I wanted to use it in a day or so altho there is no spe- cial hurry. Yours dindench truly OTlain Frederick B. Flinn