Chapter 6

GEOLOGY AND MINERALOGY OF THE MOUNTAIN. 114

Elie de Beaumont's classification of the rocks of Etna.--Hoffman's geological map.--Lyell's researches.--The period of earliest eruption.--The Val del Bove.--Two craters of eruption.--Antiquity of Etna.--The lavas of Etna.--Labradorite.--Augite.--Olivine.-- Analcime.--Titaniferous iron.--Mr. Rutley's examination of Etna lavas under the microscope.

LIST OF ILLUSTRATIONS.

View of Etna from Catania _To face Title._ Topographical Map of Etna _To face page_ 1 Sections of Etna " 30 Grotto delle Palombe " 36 The Casa Inglesi and Cone of Etna " 52 View of the Val de Bove " 58 View of Etna from Bronte " 66 Island of Columnar Basalt off Trezza " 74 Geological Map of Etna " 114 Map of the Val del Bove (woodcut) 117 Ideal Section of Mount Etna 119 Profile of Etna 121 Sections of Etna Lavas seen under the Microscope, _to face p._ 138

ETNA.

A HISTORY OF THE MOUNTAIN AND OF ITS ERUPTIONS.