• 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. | Letter from Peter Robertson to Charles Robert Darwin; written at Edinburgh, 1867-04-30 | Peter Robertson to Charles Robert Darwin, 1867-04-30

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