Note 2 — Chapter II · FORM, STRUCTURE, AND COMPOSITION OF VOLCANIC MOUNTAINS.
Reading edition
Humboldt says: "The form of isolated conical mountains, as those of Vesuvius, Etna, the Peak of Teneriffe, Tunguagua, and Cotopaxi, is certainly the shape most commonly observed in volcanoes all over the globe."—Views of Nature, translated by E. C. Otté and H. G. Bohn (1850).