Letter from Thomas Gold to Professor Richard Berendzen, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, Massachusetts Regrets that an important conference in the Soviet Union will clash with the meeting of the New York Academy of Sciences at which Gold was to speak. He felt obliged to accept the invitation there to give an introductory lecture, and regerets therefore that he has to cancel his engagement at the New York Academy. 13 August 1971