The number of seeds
produced by the crossed and self-fertilised flowers differed very
little.
[Crossed and self-fertilised seeds obtained in the above manner were
allowed to germinate on damp sand, and as often as pairs germinated at
the same time they were planted in the manner described in the
Introduction (Chapter 1), on the opposite sides of two pots. Five pairs
were thus planted; and all the remaining seeds, whether or not in a
state of germination, were planted on the opposite sides of a third pot,
so that the young plants on both sides were here greatly crowded and
exposed to very severe competition. Rods of iron or wood of equal
diameter were given to all the plants to twine up; and as soon as one of
each pair reached the summit both were measured. A single rod was placed
on each side of the crowded pot, Number 3, and only the tallest plant on
each side was measured.
TABLE 2/1. Ipomoea purpurea (First Generation.).
Heights of Plants in inches:
Column 1: Number (Name) of Pot.
Column 2: Seedlings from Crossed Plants.
Column 3: Seedlings from Self-fertilised Plants.
Pot 1 : 87 4/8 : 69.
Pot 1 : 87 4/8 : 66.
Pot 1 : 89 : 73.
Pot 2 : 88 : 68 4/8.
Pot 2 : 87 : 60 4/8.
Pot 3 : 77 : 57.
Plants crowded; the tallest one measured on each side.
Total : 516 : 394.
The average height of the six crossed plants is here 86 inches, whilst
that of the six self-fertilised plants is only 65.
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