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12. Inheritance; 13. Inheritance continued: reversion or atavism; 14. Inheritance continued: fixedness of character, prepotency, sexual limitation; correspondence of age; 15. On crossing; 16. Causes which interfere with the free crossing of varieties, influence of domestication on fertility; 17. On the good effects of crossing, and on the evil effects of close interbreeding; 18. On the advantages and disadvantages of changed conditions of life: sterility form various causes; 19. Summary of the four last chapters, with remarks on hybridism; 20. Selection by man; 21. Selection continued; 22. Causes of variability; 23. Direct and definite action of the external conditions of life; 24. Laws of variation, use and disuse, etc.; 25. Laws of variation continued, correlated variability; 26. Laws of variation continued, summary; 27. Provisional hypothesis of pangenesis; 28. Concluding remarks; Index.