this age are given in the two left columns of Table 6/84.

When in full flower the tallest plants on each side were again measured,
see the two right hand columns in Table 6/84. But I should state that
the pots were not large enough, and the plants never grew to their
proper height. The four tallest crossed plants now averaged 18.5, and
the four tallest self-fertilised plants 32.75 inches in height; or as
100 to 178. In all four pots a self-fertilised plant flowered before any
one of the crossed.

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.