Rocks of Past Geological
Periods of the British Isles 196-199

PART VI.

_SPECIAL VOLCANIC AND SEISMIC PHENOMENA._

Chap. I. The Eruption of Krakatoa in 1883 201-216

" II. Earthquakes 217-224

PART VII.

_VOLCANIC AND SEISMIC PROBLEMS._

Chap. I. The Ultimate Cause of Volcanic Action 225-235

" II. Lunar Volcanoes 236-252

" III. Are we Living in an Epoch of Special
Volcanic Activity? 253-257

APPENDIX.

A Brief Account of the Principal Varieties of
Volcanic Rocks 259-265

Index 268

ILLUSTRATIONS.

Fig. 1. Eruption of Vesuvius, 1872-73 _Frontispiece_

" 2. Cotopaxi _Page_ 16

" 3. Volcanic Cone of Orizaba " 21

Map of the World, showing Active and
Extinct Volcanoes " 23

" 4. Teneriffe, seen from the Ocean " 31

" 5. View of the Summit of Teneriffe " 35

" 6. Probable Aspect of Vesuvius at Beginning
of Christian Era " 43

" 7. View of Vesuvius before 1767 " 50

" 8. Map of District bordering Bay of Naples " 52

" 9. View of Vesuvius in 1872 " 53

" 10. Ideal Section through Etna " 63

" 11. Map of the Lipari Islands " 70

" 12. The Island of Vulcano in Eruption " 71

" 13. Ideal Section through Gulf of Santorin " 76

" 14. Bird's-eye View of Gulf of Santorin " 79

" 15. Ground Plan of Rocca Monfina " 80

" 16. Geological Section of Tiber Valley at
Rome " 88

" 17. Generalised Section Through the Vale
of Clermont " 93

Fig. 18. View of Puy de Dome and Neighbouring
Volcanoes _Page_ 95

" 19. Mont Demise, seen from the S.E. " 103

" 20. Sketch Map of Rhenish Area in the
Miocene Epoch " 114

" 21. The Volcanic Range of