UNION CARBIDE CORPORATION PLASTICS DIVISION 270 PARK AVENUE, NEW YORK, N. Y. 10017 C. M. BLaiR EXECUTIVE VICE PRESIDENT February 11, 1965 Dr. Joshua Lederberg Professor of Genetics Stanford University School of Medicine Stanford Medical Center Palo Alto, California 94304 Dear Dr. Lederberg: Replying to your letter of January 18, 1965, I do not know of any similar applications or of any more formal proof of 1.221. I am forwarding your letter and the Interim Report to Dr. Henze at the University of Texas. Sincerely yours, Cajjnhern. CMB/db Alvig WY