When Eugster buffered fO2 He closed his system tight He'd read his Duhem and he knew Two variables were just right Out in the world where geologists toil In a system that is porous We've escaped that roll of platinum foil And must beware what the F does for us -------------------------------------------- Professor Bruce Yardley School of Earth Sciences University of Leeds Leeds LS2 9JT UK Tel. 0113 233 5227 Fax 0113 233 5259 --------------------------------------------- GEOFLUIDS now exists! http://www.blackwell-science.com/gfl