• 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. | The sensitiveness of the reproductive systems to slight mutual difference in the male and [female] elemt is something wonderful, 1873-04-29 | The sensitiveness of the reproductive systems to slight mutual difference in the male and [female] elemt is something wonderful, 1873-04-29

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