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TABLE OF CONTENTS 



I'KKFACE XV 



I.NTKODUCTION XXi 



PAIM' I OlKiAXrC EVOLUTIOX 



CIIAl'TKK PAGE 



I Variatiox axd ITeukdity 1-19 



Rosfiiibhuice of parents to offspring — Resemblance not 

 exact — The continuity of germ plasm — Variation: 

 lluctuating and stable^ — jNIutation — IMendelian inheri- 

 tance — Tiie theory of regression. 



The RTRrtiCLE fob Existkxce 20-38 



TliP struggle for life — The rate of reproduction — The . / 

 i infantih' death-rate — Natural selection — 'J'lie survival V 



of the fit — The origin of s])ecies — yummary of theory 

 of natural selection — Sexual selection — Tlie inheri- 

 tance of acquired characteristics — Adaptation. 



The Ohicix axu Axtiqvity of ]\L\x 30-101 



Origin of num 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 pri-historic man — Geologic time 

 and the age of laiman remains — The ice ages — The 

 zone of origin — The Neanderthal skull — The Pithi- 

 cantiiropus Krectus — The Heidelberg jaw — The Eoan- 

 thropus — Rreliistoric caves and imijlenionts — The Paleo- 

 litliic i>eriod — The Neolithic period. 



PART II SOCIAL EVOLUTIOX 



ASSOCIATIOX 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 ])rocess cumulates 

 gains tlirough imitation — Association transformed 

 the brute mind into the human intellect — Stimulation 

 and response — Interstimulation and response — DilTer- 

 entiation and resemblance — Social life reacted on bodily 

 structure — Plav and festivity and the origin of speech — 



