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Preface; 1. Changes of the organic world; 2. Recapitulation of the arguments; 3. Variability of a species; 4. Consideration of the question whether species have a real existence; 5. Laws which regulate the geographical distribution of species; 6. Geographical distribution of animals; 7. Geographical distribution and migration of fish; 8. Theories respecting the original introduction of species; 9. The circumstances which constitute the stations of animals are changeable; 10. Influence of organic causes in changing the habitations of species; 11. Theory of the successive extinction of species; 12. Effects produced by the powers of vitality; 13. Effects produced by the action of animals and vegetable life; 14. Imbedding of organic remains in alluvium and the ruins caused by landslips; 15. Imbedding of organic remains in subaqueous deposits; 16. Imbedding of the remains of man and his works in subaqueous strata; 17. Imbedding of aquatic species in subaqueous strata; 18. Formation of coral reefs.