• 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. | Do varieties wear out, or tend to wear out? 'New York Tribune (weekly)': 6, 1874-12-09 | Do varieties wear out or tend to wear out? 'New York Tribune (weekly)': 6, 1874-12-09

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