XVI CONTENTS. 



CHAPTER XVIII. 



PAGE 



Special Physiology of Sex and Reproduction - - 239-263 



§ I. The continuity of the germ-plasma. 



§ 2. Sexual maturity. 



§ 3. Menstruation. 



§ 4. Sexual union. 



§ 5. Parturition. 



§ 6. Early nutrition. 



§ 7. Lactation. 



§ 8. Other secretions. 



§ 9. Incubation. 



§ 10. Nemesis of reproduction. 



§ II. Love and death, or organic immortality. 



CHAPTER XIX. 



Psychological and Ethical Aspects - - - 264-282 



§ I. Common ground between animals and men. . 



§ 2. The love of mates. 



§ 3. Sexual attraction. 



§ 4. Intellectual and emotional differences between the 



sexes. 

 § 5. Love for offspring. 

 § 6. Criminal habit of the cuckoo. 

 § 7. Egoism and altruism. 



CHAPTER XX. 

 Laws of Multiplication . . . . . 283-299 



§ I. Rate of reproduction and rate of increase. 



§ 2. History of discussion. 



§ 3. Spencer's analysis ; individuation and genesis. 



§ 4. Spencer's application to man. 



§ 5. General statement of the population question. 



§6. Sterility. 



CHAPTER XXI. 



The Reproductive Factor in Evolution - - - 300-315 



§1. General history of evolution. 



§ 2. The reproductive factor so far as hitherto recognised. 

 § 3. Suggested lines of further construction. 



