CONTENTS. 



PAGE. 



XIII. COURSES OF THE EARTH'S MASONRY, ...... 74 



How the formations are arranged. 



XIV. A WALK IN THE YELLOWSTONE PARK, ..... 79 



Thermal Waters. 



XV. AMONG THE VOLCANOES, ............ 85 



Indications of Internal Fires. 



XVI. FROZEN SEAS OF LAVA, ........ . . . . 91 



Ancient Lavas. 



XVII. IMPRISONED HEAT, .............. 96 



Internal Condition of the Earth. 



XVIII. THE UNSTABLE LAND, ............. 102 



Phenomena and Causes of Earthquakes. 



XIX. THE FRAMEWORK OF THE MOUNTAINS, ..... 108 

 Mountain Structures. 



XX. How THE MOUNTAIN FRAMEWORK is REARED . . 113 

 Mountain Formation. 



XXI. DOWN IN A MINE, ............... 119 



Modes of Occurence of the Metals. 



XXII. THE KING OF METALS, ............ 125 



Iron and Its Geology. 



XXIII. THE CRYSTALS OF THE SEA, .......... 130 



Salt and Gypsum. 



XXIV. LIQUID SUNLIGHT, ........... .... 135 



Petroleum. 



XXV. GASEOUS SUNLIGHT, ...... ..... 141 



Natural Gas Its Wonders and its Geology. 



XXVI. SOLIDIFIED SUNLIGHT, ............. 149 



Coal and Coal-Beds. 



3^ttt<m0 th* 



XXVII. MONSTERS OF A BURIED WORLD, ........ 154 



Extinct -Quaternary Mammals. 



XXVIII. THE CEMETERIES OF THE BAD LANDS, ..... 162 

 Tertiary Fossils. 



XXIX. LESSON FROM A LUMP OP CHALK, ...... 167 



Mesozoic Rocks and Fossils. 



