In Pot 4, in which the plants were extremely crowded, the two lots were
at first equal; and ultimately the tallest crossed plant exceeded by a
trifle the tallest self-fertilised plant. This recalled to my mind an
analogous case in the one generation of Petunia, in which the
self-fertilised plants were throughout their growth taller than the
crossed in all the pots except in the crowded one. Accordingly another
trial was made, and some of the same crossed and self-fertilised seeds
of tobacco were sown thickly on opposite sides of two additional pots;
the plants being left to grow up much crowded. When they were between 13
and 14 inches in height there was no difference between the two sides,
nor was there any marked difference when the plants had grown as tall as
they could; for in one pot the tallest crossed plant was 26 1/2 inches
in height, and exceeded by 2 inches the tallest self-fertilised plant,
whilst in the other pot, the tallest crossed plant was shorter by 3 1/2
inches than the tallest self-fertilised plant, which was 22 inches in
height.
TABLE 6/84. Nicotiana tabacum (first generation).
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants, May 20, 1868.
Column 3: self-fertilised Plants, May 20, 1868.
Column 4: Crossed Plants, December 6, 1868.
Column 5: self-fertilised Plants, December 6, 1868.
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