Commonly use symbols and abbreviation code Acknowledgements General introduction 1. Editorial considerations 2. Darwin's table of contents 3. Possibility of all organic beings crossing 4. Variation under nature 5. The struggle for existence 6. On natural selection 7. Laws of variation 8. Difficulties on the theory 9. Hybridism 10. Mental powers and instincts of animals 11. Geographical distribution Appendices Bibliography Guides to the texts of the long and short versions Collation between the Origin and Natural Selection Index.
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