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Darwin, Charles, 1809-1882

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


TABLE 2/12. Ipomoea purpurea.
Heights of Plants in inches:
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 82 : 77 4/8.
Pot 1 : 75 : 87.
Pot 1 : 65 : 64.
Pot 1 : 76 : 87 2/8.
Pot 2 : 78 4/8 : 84.
Pot 2 : 43 : 86 4/8.
Pot 2 : 65 4/8 : 90 4/8.
Pot 3 : 61 2/8 : 86.
Pot 3 : 85 : 69 4/8.
Pot 3 : 89 : 87 4/8.
Pot 4 : 83 : 80 4/8.
Pot 4 : 73 4/8 : 88 4/8.
Pot 4 : 67 : 84 4/8.
Pot 5 : 78 : 66 4/8.
Pot 5 : 76 6/8 : 77 4/8.
Pot 5 : 57 : 81 4/8.
Pot 6 : 70 4/8 : 80.
Pot 6 : 79 : 82 4/8.
Pot 6 : 79 6/8 : 55 4/8.
Pot 7 : 76 : 77.
Pot 7 : 84 4/8 : 83 4/8.
Pot 7 : 79 : 73 4/8.
Pot 8 : 73 : 76 4/8.
Pot 8 : 67 : 82.
Pot 8 : 83 : 80 4/8.
Pot 9 : 73 2/8 : 78 4/8.
Pot 9 : 78 : 67 4/8.
Pot 10 : 34 : 82 4/8.
Pot 10 : 82 : 36 6/8.
Pot 10 : 84 6/8 : 69 4/8.
Pot 10 : 71 : 75 2/8.
Crowded plants.
Total : 2270.25 : 2399.75.
The average height of the thirty-one crossed plants is 73.23 inches, and
that of the thirty-one self-fertilised plants 77.41 inches; or as 100 to
106. Looking to each pair, it may be seen that only thirteen of the
crossed plants, whilst eighteen of the self-fertilised plants exceed
their opponents.


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