• 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 | 'Old observations on Diptera sucking Flowers' | Summer 1842 Notebook: 1 (excised page), 1842-06-01 | Summer 1842: 1r, 1842-06-01

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