This line of experiment was therefore
discontinued, and I tried whether intercrossing two self-fertilised
plants of the sixth generation, growing in distinct pots, would give
their offspring any advantage over the offspring of flowers on one of
the same plants fertilised with their own pollen. These latter seedlings
formed the seventh generation of self-fertilised plants, like those in
the right hand column in Table 3/18; the crossed plants were the product
of six previous self-fertilised generations with an intercross in the
last generation. The seeds were allowed to germinate on sand, and were
planted in pairs on opposite sides of four pots, all the remaining seeds
being sown crowded on opposite sides of Pot 5 in Table 3/19; the three
tallest on each side in this latter pot being alone measured. All the
plants were twice measured--the first time whilst young, and the average
height of the crossed plants to that of the self-fertilised was then as
100 to 122. When fully grown they were again measured, as in Table 3/19.
TABLE 3/19. Mimulus luteus.
Heights of Plants in inches:
Column 1: Number (Name) of Pot.
Column 2: Intercrossed Plants from Self-fertilised Plants of the Sixth
Generation.
Column 3: Self-fertilised Plants of the Seventh Generation.
Pot 1 : 12 6/8 : 15 2/8.
Pot 1 : 10 4/8 : 11 5/8.
Pot 1 : 10 : 11.
Pot 1 : 14 5/8 : 11.
Pot 2 : 10 2/8 : 11 3/8.
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