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Darwin, Charles, 1809-1882

"Effects of Cross and Self Fertilisation in the Vegetable Kingdom"


Heights of plants measured in inches.
Column 1: Name of Plant.
Column 2: Number of Crossed Plants measured.
Column 3: Average Height of Crossed Plants.
Column 4: Number of Self-fertilised Plants measured.
Column 5: Average Height of Self-fertilised Plants.
Column 6: x, where the ratio of the Average Height of the Crossed to the
Self-fertilised Plants is expressed as 100 to x.
Ipomoea purpurea--first generation:
6 : 86.00 : 6 : 65.66 : 76.
Ipomoea purpurea--second generation:
6 : 84.16 : 6 : 66.33 : 79.
Ipomoea purpurea--third generation:
6 : 77.41 : 6 : 52.83 : 68.
Ipomoea purpurea--fourth generation:
7 : 69.78 : 7 : 60.14 : 86.
Ipomoea purpurea--fifth generation:
6 : 82.54 : 6 : 62.33 : 75.
Ipomoea purpurea--sixth generation:
6 : 87.50 : 6 : 63.16 : 72.
Ipomoea purpurea--seventh generation:
9 : 83.94 : 9 : 68.25 : 81.
Ipomoea purpurea--eighth generation:
8 : 113.25 : 8 : 96.65 : 85.
Ipomoea purpurea--ninth generation:
14 : 81.39 : 14 : 64.07 : 79.
Ipomoea purpurea--tenth generation:
5 : 93.70 : 5 : 50.40 : 54.
Ipomoea purpurea--Number and average height of all the plants of the ten
generations:
73 : 85.84 : 73 : 66.02 : 77.
Mimulus luteus--three first generations, before the new and taller
self-fertilised variety appeared:
10 : 8.19 : 10 : 5.


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