CONTENTS 



Pase 

 Preface -. iii 



Introduction vi 



Chapter 



I. — ^Process of Po-wier Changes 13 



n. — Some Eminent Men 29 



in.— The Age of Parents 45 



IV. — ^Prom Savagery to Civilization. . 56 



Vj— Evolution of Intelligence and 



Longevity 70 



VI. — ^Disease and Immunity 82 



Index 105 



