Letter from Thomas Gold to Dr Joshua Lederberg, Department of Genetics, SChool of Medicine, Stanford University, Stanford, California Thanks himi for his note. They know a fair amount now about gases coming our of the Earth. His colleague Mel Calvin has a long paper of Gold's on the subject. It is remarkable how a whole set of phenomena, well known in the past, has gone unrecorded and ignored in their modern scientific age! 11 January 1978