yielded much fewer seeds than those fertilised with their own pollen;
and the trial just given, as well as that in Table 6/84, show us clearly
that the plants raised from the crossed seeds were inferior in height to
those from the self-fertilised seeds; but only when not greatly crowded.
When crowded and thus subjected to very severe competition, the crossed
and self-fertilised plants were nearly equal in height.

CROSSED AND SELF-FERTILISED PLANTS OF THE SECOND GENERATION.

Twelve flowers on the crossed plants of the last generation growing in
the four large pots just mentioned, were crossed with pollen from a
crossed plant growing in one of the other pots; and twelve flowers on
the self-fertilised plants were fertilised with their own pollen. All
these flowers of both lots produced fine capsules. Ten of the crossed
capsules contained by weight 38.92 grains of seeds, and ten of the
self-fertilised capsules 37.74 grains; or as 100 to 97. Some of these
seeds in an equal state of germination were planted in pairs on the
opposite sides of five large pots. A good many of the crossed seeds
germinated before the self-fertilised, and were of course rejected. The
plants thus raised were measured when several of them were in full
flower.

TABLE 6/85. Nicotiana tabacum (second generation).

Heights of plants measured in inches.

Column 1: Number (Name) of Pot.

Column 2: Crossed Plants.