• Darwin Archive | 'Natural Selection': draft chapters, 1856-1858 | 'Natural Selection': material relating to chapter 4 , 1856 - 1857 | Calculations and tables for 'Natural Selection': chapter 4 | List of those genera which have vars in the Manual & which have "close species" in Dr Grays M S, 1809-01-01 - 1882-04-30 | List of those genera which have vars in the Manual & which have "close species" in Dr Grays M S, 1809-01-01 - 1882-04-30

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