XVI CONTENTS. 



CHAPTER XVIII. 



PACE 



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 



§ I. General history of evolution. 



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



§ 3- Suggested lines of further construction. 



