• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': observations on insects visiting flowers and 'Cross and self fertilisation' experiments, 1840s-1860s | Insect visits and/or cross and self-fertilisation experiments; Dichogamy. | On the fertilisation of British orchids by insect agency (reprinted from "Gardeners' Chronicle" of 9 June 1860); and a letter with Editors' response 'Entomologist's Weekly Intelligencer': 102-104, 1860-06-30 | Entomologist's Weekly Intelligencer': 97, 1860-06-30

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