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Darwin, Charles, 1809-1882

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

The
plants were trained up sticks, and thus grew to a considerable height.
In four out of the five pots a crossed plant flowered before any one of
the self-fertilised. The plants were first measured to the tips of their
leaves, before they had flowered and when the crossed were under a foot
in height. The twelve crossed plants averaged 11.1 inches in height,
whilst the twelve self-fertilised were less than half of this height,
namely, 5.45; or as 100 to 49. Before the plants had grown to their full
height, two of the self-fertilised died, and as I feared that this might
happen with others, they were again measured to the tops of their stems,
as shown in Table 5/72.
TABLE 5/72. Nemophila insignis; 0 means that the plant died.
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 32 4/8 : 21 2/8.
Pot 2 : 34 4/8 : 23 5/8.
Pot 3 : 33 1/8 : 19.
Pot 3 : 22 2/8 : 7 2/8.
Pot 3 : 29 : 17 4/8.
Pot 4 : 35 4/8 : 10 4/8.
Pot 4 : 33 4/8 : 27.
Pot 5 : 35 : 0.
Pot 5 : 38 : 18 3/8.
Pot 5 : 36 : 20 4/8.
Pot 5 : 37 4/8 : 34.
Pot 5 : 32 4/8 : 0.
Total : 399.38 : 199.00.
The twelve crossed plants now averaged 33.28, and the ten
self-fertilised 19.9 inches in height, or as 100 to 60; so that they
differed somewhat less than before.


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