CONTENTS. 



BOOK I. —MALE AND FEMALE. 



CHAPTER I. 



PAGE 



The Sexes and Sexual Selection . - . . 3-1^ 



§ I. Primary and secondary sexual characters. 

 § 2. Illustrations from Darwin. 

 § 3. Darwin's explanation by sexual selection. 

 § 4. Criticisms of sexual selection — 



{a.) Wallace. 



{d.) Brooks. 



(c.) St George Mivart. 



{d. ) Others. 



CHAPTER H. 



The Sexes, and Criticism of Sexual Selection - - 16-31 



§ I. Search for a broader basis. 



§ 2. Differences in general habit, &c. Males active, females 



passive. 

 § 3. Differences in size. Males smaller, females larger. 



Pigmies and exceptions. 

 § 4. Secondary differences in colour, skin, &c. Males 



katabolic, females anabolic. 

 § 5. Sexual selection : Its limits as an explanation. 



Postulate of extreme aesthetic sensi- 

 tiveness. 

 Darwin and Wallace combined and 



supplemented. 

 Sexual selection a minor accelerant, 

 natural selection a retarding action, 

 on constitutional differentiation. 



