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1. Variation Under Domestication
2. Variation under Nature
3. Struggle for Existence
4. Natural Selection
5. Laws of Variation
6. Difficulties on Theory
7. Instinct
8. Hybridism
9. On the Imperfection of the Geological Record
10. On the Geological Succession of Organic Beings
11. Geographical Distribution
12. Geographical Distribution (continued)
13. Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs
14. Recapitulation and Conclusion.

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