TABLE OF CONTENTS 



PREFACE xv 



INTRODUCTION xx i 



PART I ORGANIC EVOLUTION 



CHAPTER PAGE 



i VARIATION AND HEREDITY 1-19 



Resemblance of parents to offspring Resemblance not 

 exact The continuity of germ plasm Variation: 

 fluctuating and stable Mutation Mendelian inheri- 

 tance The theory of regression. 



ii THE STRUGGLE FOR EXISTENCE 20-38 



The struggle for life The rate of reproduction The 

 infantile death-rate Natural selection The survival 

 of the fit The origin of species Summary of theory 

 of natural selection Sexual selection The inheri- 

 tance of acquired characteristics Adaptation. 



in THE ORIGIN AND ANTIQUITY OF MAN . . . . . . 39-101 



Origin of man by descent from a lower form The series 

 of ancestral forms Human species and the ape family 

 Structural evidence of relationship Sexual selection 

 and man Remains of prehistoric man Geologic time 

 and the age of human remains The ice ages The 

 zone of origin The Neanderthal skull The Pithe- 

 canthropus Erectus The Heidelberg jaw The Eoan- 

 thropus Prehistoric caves and implements The Paleo- 

 lithic period The Neolithic period. 



PART II SOCIAL EVOLUTION 

 iv ASSOCIATION 102-120 



Origin of human nature in social life The precursor of 

 man a social animal Association afforded protection 

 from foes Mutual aid and cooperation Association 

 affects selection survival Association assures food 

 supply and numerous offspring Association pre- 

 serves useful variation The social process cumulates 

 gains through imitation Association transformed 

 the brute mind into the human intellect Stimulation 

 and response Interstimulation and response Differ- 

 entiation and resemblance Social life reacted on bodily 

 structure Play and festivity and the origin of speech 



