The parts of a volcano illustrated with Mount Vesuvius: "a, the cone; b, summit cinder-cone; c, Somma, part of former outline of crater; d, Hermitage (now Observatory); e, Portici; f, Herculaneum; g, Torre del Greco." -Dana, 1883

Mount Vesuvius

The parts of a volcano illustrated with Mount Vesuvius: "a, the cone; b, summit cinder-cone; c, Somma,…