CONTENTS 



CHAPTER V 

 FACTS OF INHERITANCE 



Progress during the Darwinian Era Demonstration of Heritable 

 Qualities Heredity, a Term for the Genetic Relation between 

 Successive Generations Appreciation of Distinction between 

 Nature and Nurture The Idea of the Continuity of Generations 

 Critical Attitude in Regard to Various Conclusions Mendelism 

 Methods of Studying Heredity Microscopical Study of the Germ- 

 cells Statistical Study : Filial Regression Galton's Law of 

 Ancestral Inheritance Experimental Study Pairing of Similar 

 Pure-bred Forms Blending Particulate Inheritance Exclusive 

 Inheritance Reversion New Departures Mendelian Inheritance 

 Unit Characters The Case of Andalusian Fowls Waltzing Mice 

 Occurrence of Mendelian Inheritance Practical Importance of 

 Mendelism Much Progress but Great Uncertainty Transmission 

 of Acquired Characters Disease Facts and Possibilities A 

 Striking Case Logical Position of the Question Cases where 

 the Theory of Modification-inheritance is Inapplicable Im- 

 portance of Environment and Function Remains Selaction and 

 Stimulus Indirect Importance of Modifications Practical Im- 

 port of the Question as to the Transmission of Acquired 

 Characters Inheritance of Moral Character Three General 

 Conclusions . pp. 129-177 



CHAPTER VI 

 SELECTION : ORGANIC AND SOCIAL 



Influence of Malthus Darwin's Position The Theory stated 

 The Theory of Natural Selection to be tested as an Interpretative 

 Formula Illustrations of Natural Selection Objections and 

 Criticisms Adaptations Changes since Darwin's Day Evidences 

 of Natural Selection Lessening the Burden of the Theory Sexual 

 Selection Isolation Gradual Diminution of Natural Selection in 



