CHAPTER VI.

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.