CONTENTS 



PAGE 



Preface RICHARD SWANN LULL v 



Chapter I. The Origin of the Earth . . JOSEPH BARRELL 1 

 Chapter II. The Earth's Changing Surface and 



Climate CHARLES SCHUCHERT 45 



Chapter III. The Origin of Life . LORANDE LOSS WOODRUFF 82 



Chapter IV. The Pulse of Life . . RICHARD SWANN LULL 109 

 Chapter V. Climate and the Evolution of Civilization 



ELLSWORTH HUNTINGTON 147 



Index 195 



