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1. An Historical Sketch Of The Progress Of Opinion On The Origin Of Species2. Introduction3. Chapter 1. Variation Under Domestication4. Chapter 2. Variation Under Nature5. Chapter 3. Struggle For Existence6. Chapter 4. Natural Selection; Or The Survival Of The Fittest7. Chapter 5. Laws Of Variation8. Chapter 6. Difficulties Of The Theory9. Chapter 7. Miscellaneous Objections To The Theory Of Natural Selection10. Chapter 8. Instinct11. Chapter 9. Hybridism12. Chapter 10. On The Imperfection Of The Geological Record13. Chapter 11. On The Geological Succession Of Organic Beings14. Chapter 12. Geographical Distribution15. Chapter 13. Geographical Distribution--Continued16. Chapter 14. Mutual Affinities Of Organic Beings: Morphology--Embryology--Rudimentary Organs17. Chapter 15. Recapitulation And Conclusion18. Glossary