conditions under which they have been
erupted and consolidated. But nothing that has been observed has tended
materially to alter conclusions arrived at by other processes of
reasoning regarding volcanic phenomena, and for these we have to fall
back upon observations conducted in the field on a more or less large
scale, and carried on before, during, and after eruptions. Macroscopic
and microscopic observations have to go hand in hand in the study of
volcanic phenomena.

E. H.

CONTENTS.

PART I.

_INTRODUCTION._

PAGE

Chap. I. Historic Notices of Volcanic Action 1-9

" II. Form, Structure, and Composition of Volcanic
Mountains 10-19

" III. Lines and Groups of Active Volcanic Vents 20-29

" IV. Mid-ocean Volcanic Islands 30-40

PART II.

_EUROPEAN VOLCANOES._

Chap. I. Vesuvius 41-60

" II. Etna 61-68

" III. The Lipari Islands, Stromboli 69-75

" IV. The Santorin Group 76-83

" V. European Extinct or Dormant Volcanoes 84-91

" VI. Extinct Volcanoes of Central France 92-112

" VII. The Volcanic District of the Rhine Valley 13-125

PART III.

_DORMANT OR MORIBUND VOLCANOES OF OTHER PARTS OF THE WORLD._

Chap. I. Dormant Volcanoes of Palestine and Arabia 126-135

" II. The Volcanic Regions of North America 136-145

" III. Volcanoes of New Zealand 146-153

PART IV.

_TERTIARY VOLCANIC DISTRICTS OF THE BRITISH ISLES._

Chap. I. Antrim 154-159

" II. Succession of Volcanic Eruptions 160-171

" III. Island of Mull and Adjoining Coast 172-176

" IV. Isle of Skye 177-179

" V. The Scuir of Eigg 180-184

" VI. Isle of Staffa 185-186

PART V.

_PRE-TERTIARY VOLCANIC ROCKS._

Chap. I. The Deccan Trap-series of India 187-189

" II. Abyssinian Table-lands 190-193

" III. Cape Colony 194-195

" IV. Volcanic