Letter from Thomas gold to Professor J M Bailey, Department of Biochemistry, The George Washington Univerxsity, The Medical Center, 1339 H Street, N.W., Washington DC Has now read all of Bailey's papers on satellite capture and finds them interesting, but does not think that a further publication in the Academy journal would be warranted. Thinks he misunderstood Gold's point about the non-conservative force and Liouville's theorem, and explains why. 3 November 1971