• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, continued | Experimental results, continued: 'Original measurement of crossed & self fertilised plants' | Red equal-styled Cowslip [comparison of crossed and self-fertile plants in size, number of seeds, speed of growth], 1866-01-01 - 1867-12-31 | Red equal-styled Cowslip [comparison of crossed and self-fertile plants in size, number of seeds, speed of growth], 1866-01-01 - 1867-12-31

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