Letter from Thomas Gold to Dr Alex Dessler, USRA, The American City Building, Suite 311, Columbia, Maryland Asks him for the current in amps tht is likely to flow through Io. Or a reference to someone who estimates such current flow. Stating the point is that eruptions on Io cannot possibly be volcanoes, since any volatile propellants would long have gone with such a level of activity. States what they are, are the plumes of surface evaporation of the entry points of pinched-down currents. The large positive thermal conductivity coefficient of rocks makes any current contract. The fuzzy halos around all the sores are due to the recondensed material kicked up by the current. Io is a beat-up cathode, and looks it! 17 May 1979