CONTENTS 



CHAPTER XXI PAGE 



THE CHALK PERIOD . . . . . 245 



CHAPTER XXII 



THE AGE OF MAMMALS . . . . . , . 256 



CHAPTER XXIII 



THE ICE AGE . . . . . . .269 



CHAPTER XXIV 



THE KINGDOM OF MAN ...... 284 



INDEX . . . . . . . . 29 



II 



