CONTENTS 



PAGE 



LIST OF ILLUSTRATIONS xiii 



CHAPTER 



I. THE CHANGING FACE OF NATURE ...... i 



II. THE WORLD IN THE MAKING . . . ...--. . . 21 



III. THE STORY OF OUR ROCK FOUNDATION 36 



IV. THE GLACIAL PERIOD 56 



V. LAKE CHICAGO AND ITS OLD SHORE LINES . . . . 78 



VI. DISTRIBUTION AND ADJUSTMENT 90 



VII. THE DUNES AND THEIR PLANTS 112 



VIII. ANIMALS OF THE DUNES 148 



IX. INTERDUNAL PONDS AND TAMARACK SWAMPS . . . .167 



X. THE CLIMAX FOREST AND ITS PREDECESSOR, THE OAK- 

 HICKORY TYPE 202 



XI. 'LAKE TO FOREST OR PRAIRIE 232 



XII. LAKE BLUFF, RAVINE, AND RIVER VALLEY 259 



XIII. BROOK, CREEK, AND RIVER 276 



XIV. SOME SOURCES OF OUR FAUNA AND FLORA .... 293 



AN OUTLINE OF SOME OF THE IMPORTANT PLANT AND ANIMAL 



ASSOCIATIONS 305 



BOOK LIST 308 



INDEX 311 



