CONTENTS. 



PART III. 



CHAPTER I. 



Page. 



Structure of the JSarth Probable Thickness of the Earth's 

 Crust Extent of Surface Simple Substances Minerals 

 Stratified Rocks Succession of Strata, - - - 177 



CHAPTER II. 



Chronological Arrangement of Strata Fossiliferous Strata 

 Tertiary System Secondary Formations Unstratified 

 Rocks Geological Names Ideal Section of the Crust of 

 the Earth, 187 



CHAPTER III. 



Aqueous Causes of Change Action of Running Water 

 Sediment deposited annually by the Ganges Excavation 

 of a Lava Current Fluviatile Formations Peat Bogs, - 197 



CHAPTERIV. 



Springs Artesian Wells Calcareous Springs Incrusta- 

 tions and Petrefactions Silicious Springs Salt Springs 

 Subterranean Springs, - - - 207 



CHAPTER V. 



Currents Gulf Stream Oceanic Currents, Chart of Ef- 

 fect of the Ocean upon Coasts* Encroachments of the 

 Sea Reculver Church The Bore, - - - - 221 



CHAPTER VI. 



Volcanoes, Distribution of Line of Volcanic Vents 



Rocky Mountains Isolated Volcanoes, - 235 



CHAPTER VJI. 



Volcanic Eruptions Destruction of Pompeii Eruptions of 

 Vesuvius Of Etna Of Hecla Of Skapta Jokul Vol- 

 canic Islands Eruption of Jorullo, .... 343 



CHAPTER VIII. 



Earthquakes, Phenomena of Extent of Country Agitated- 



