• 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 | I have most carefully gone over the London Catalogue of 1853 & I find there are 1445 phanero[gamic] plants considered as species, 1855-10-01 - 1855-11-30 | verso of p 1

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