A two-week Institute entitled Volcanism on Earth and in the Solar System will be held at the International School of Earth Sciences Erice, Trapani, Sicily, from October 7 to 20, 1973. The institute is being sponsored by a number of Italian organizations including the Italian National Research Council (CNR), the Regional Sicilian Government (ERS), and the Italian Ministry of Public Education (MPI). Two optional field trips are also scheduled, one to the Mt. Etna volcanic fields several days before the institute begins and the other to the nearby Aeolian Islands of Stromboli, Lipari, and Vulcano several days after the institute. All lectures will be presented in English at a professional development level by an international team of about 20 distinguished European and American authorities. Attendance from the U.S. and abroad will be limited to about 100.