produced seeds compared with the self-fertilised as 100 to 45. These
latter seeds, however, were decidedly heavier, a hundred weighing 41.64
grains, than those from the capsules on the crossed plants, of which a
hundred weighed 36.79 grains; and this probably was due to the fewer
capsules borne by the self-fertilised plants having been better
nourished. We thus see that the crossed plants in this the first
generation, when grown under favourable conditions, and when grown under
unfavourable conditions from being much crowded, greatly exceeded in
height, and in the number of capsules produced, and slightly in the
number of seeds per capsule, the self-fertilised plants.

CROSSED AND SELF-FERTILISED PLANTS OF THE SECOND GENERATION.

Flowers on the crossed plants of the last generation (Table 2/1) were
crossed by pollen from distinct plants of the same generation; and
flowers on the self-fertilised plants were fertilised by pollen from the
same flower. The seeds thus produced were treated in every respect as
before, and we have in Table 2/2 the result.

TABLE 2/2. Ipomoea purpurea (Second Generation.).

Heights of Plants in inches:

Column 1: Number (Name) of Pot.

Column 2: Crossed Plants.

Column 3: Self-fertilised Plants.

Pot 1 : 87 : 67 4/8.