CONTENTS.

CHAPTER I.
PAGE
INTRODUCTORY: NATURE OF THE ENQUIRY
[1]
CHAPTER II.
THE NATURE OF VOLCANIC ACTION
[7]
CHAPTER III.
THE PRODUCTS OF VOLCANIC ACTION
[39]
CHAPTER IV.
THE DISTRIBUTION OF THE MATERIALS EJECTED FROM VOLCANIC VENTS
[67]
CHAPTER V.
THE INTERNAL STRUCTURE OF VOLCANIC MOUNTAINS
[112]
CHAPTER VI.
THE VARIOUS STRUCTURES BUILT UP AROUND VOLCANIC VENTS
[161]
CHAPTER VII.
THE SUCCESSION OF OPERATIONS TAKING PLACE AT VOLCANIC CENTRES
[186]
CHAPTER VIII.
THE DISTRIBUTION OF VOLCANOES UPON THE SURFACE OF THE GLOBE
[224]
CHAPTER IX.
VOLCANIC ACTION AT DIFFERENT PERIODS OF THE EARTH'S HISTORY
[247]
CHAPTER X.
THE PART PLAYED BY VOLCANOES IN THE ECONOMY OF NATURE
[281]
CHAPTER XI.
WHAT VOLCANOES TEACH US CONCERNING THE NATURE OF THE EARTH'S INTERIOR
[307]
CHAPTER XII.
THE ATTEMPTS WHICH HAVE BEEN MADE TO EXPLAIN THE CAUSES OF VOLCANIC ACTION
[331]
INDEX
[371]