CONTENTS 



CHAPTER X PAGE 



THE EARTH AS THE ABODE OF LIFE 108 



CHAPTER XI 



LIFE IN OTHER WORLDS . . . . . . Il8 



CHAPTER XII 



THE HARDENING OF ROCKS ..... 128 



CHAPTER XIII 



EARTHQUAKES IN GEOLOGY . . . . . 137 



CHAPTER XIV 



SOME FAMOUS EARTHQUAKES . . . . .148 



CHAPTER XV 



THE CAUSES OF EARTHQUAKES . . . . .165 



CHAPTER XVI 



VOLCANOES AND MOUNTAIN FORMATION . . . '179 



CHAPTER XVII 



FAMILIES OF ROCKS AND THEIR DESCENDANTS . . 197 



CHAPTER XVIII 



HOW THE COAL BEDS WERE LAID DOWN . . .212 



CHAPTER XIX 



THE AGE OF REPTILES ...... 226 



CHAPTER XX 

 THE AGE OF REPTILES (continued) .... 235 



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