CONTENTS 



CHAPTER PAGE 



I. Evolution the Key to Nature . i 



II. The Evolution of the Universe . ii 



III. Life in the Primitive Ocean . . 22 



IV. Land Life Begins .... 36 

 V. In the Grip of an Ice Age . . 48 



VI. The Brontosaur and Its Cousins . 59 



VII. The Evolution of the Flowers . 71 



VIII. The Coming of the Birds . . 82 



IX. The Triumph of the Mammals . 92 



X. The Origin of Man . . .105 



XI. Social Evolution . . . .117 



