• Darwin Archive | 'Descent of man': portfolios | 'Descent of man': first edition, 1871, and 'Insectivorous Plants' | 'Descent of man' first edition: used scraps relating to 'Man' and notes relating to principles of sexual selection, polygamy and number of sexes | Descent Portfolios 1st edn, Sexual Selection: Chap 1, polygamy, number of sexes | Polygamy &c-30 Letter, 1868-02-20 | [Roland Trimen] to Charles Robert Darwin, 1868-02-20

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