Letter from Thomas Gold to Dr Richard Goody, Department of Earth and Planetary Studies, Harvard University, Cambridge, Massachusetts Encloses the oxygen story Gold had mentioned, the figures can be pushed around a little, but cannot make ends meet with the arbon all supplied as CO2. States it is curious that this has not been discussed before. The other point is that the atmospheric oxygen is likely to have varied a great deal as tectonic processes varied. 28 April 1978