CHAPTER V 



SELECTION 



Huxley on "The Quintessence of Darwinism" Analytic- 

 Abstract of "The Origin of Species" (Variation under 

 Domestication Artificial Selection Variation under 

 Natural Conditions Struggle for Existence Natural 

 Selection) 



The Case for Natural Selection Direct Evidence of Natural 

 Selection Implications of the Concept of Natural Selec- 

 tion Different Kinds of Selection (Sexual Selection 

 Germinal Selection) Family and Group Selection Auxil- 

 iary Hypothesis of Isolation Eugenics as a Renewal of 

 Evolution. 



DARWIN'S achievement in "The Origin of 

 Species ' : was twofold. In the first p'ace, 

 he presented the evidences of the fact of 

 evolution so forcibly and so fairly that he 

 made evolutionists of the great majority of 

 his readers. Indeed, he made the world 

 "think in terms of evolution." In the second 

 place, in his theory of Nature's sifting of 

 hereditary variations he gave a causal inter- 

 pretation of the age-long process of Becoming. 

 He made the evolution idea current intellec- 

 tual coin; but his success hi making the fact 

 clear and credible was in part due to his 

 discovery of one of the chief factors. 



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