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Darwin, Charles, 1809-1882

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

I counted the seeds in one of the finest capsules on the
crossed plants, and it contained seventy-three; whilst the finest of the
five capsules produced by the self-fertilised plants contained only
thirty-five good seeds. In the other four capsules most of the seeds
were barely half as large as those in the crossed capsules.
TABLE 6/91. Cyclamen persicum: 0 implies that no flower-stem was
produced.
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 10 : 0.
Pot 1 : 9 2/8 : 0.
Pot 1 : 10 2/8 : 0.
Pot 2 : 9 2/8 : 0.
Pot 2 : 10 : 0.
Pot 2 : 10 2/8 : 0.
Pot 3 : 9 1/8 : 8.
Pot 3 : 9 5/8 : 6 7/8.
Pot 3 : 9 5/8 : 6 6/8.
Pot 4 : 11 1/8 : 0.
Pot 4 : 10 5/8 : 7 7/8.
Pot 4 : 10 6/8 : 0.
Total : 119.88 : 29.50.
In the following year the crossed plants again bore many flowers before
the self-fertilised bore a single one. The three tallest flower-stems on
the crossed plants in each of the pots were measured, as shown in Table
6/91. In Pots 1 and 2 the self-fertilised plants did not produce a
single flower-stem; in Pot 4 only one; and in Pot 3 six, of which the
three tallest were measured.
The average height of the twelve flower-stems on the crossed plants is
9.99, and that of the four flower-stems on the self-fertilised plants
7.


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