Rock fragments from Fosa Grande, Mount Vesuvius, c 1770.
© Science Museum / Science & Society Picture Library
Hand-coloured etching by Peter Fabris (active 1768-1779). Illustrated plate from William Hamilton's study of Italian volcanoes, 'Campi Phlegraei' (published in Naples, 1776). Two rock fragments found at Fosa Grande, a hollow way cut by rain water on the flanks of Mount Vesuvius, which are (1) a piece of marble found in the deep ravines and (2) a piece of calcarious stone full of marine shells. Based on letters sent to the Royal Society, Hamilton's book is a seminal work on the nature and effects of volcanic activity.