one corner, and six self-fertilised seeds in the opposite corner. All
the seedlings from the latter soon died excepting one, and this grew to
the height of only 1 1/2 inches. Of the crossed plants three survived,
and they grew to the height of 2 1/2 inches, but were not able to twine
round a stick; nevertheless, to my surprise, they produced some small
miserable flowers. The crossed plants thus had a decided advantage over
the self-fertilised plants under this extremity of bad conditions.

CROSSED AND SELF-FERTILISED PLANTS OF THE FIFTH GENERATION.

These were raised in the same manner as before, and when measured gave
the following results:--

TABLE 2/6. Ipomoea purpurea (Fifth Generation).

Heights of Plants in inches:

Column 1: Number (Name) of Pot.

Column 2: Crossed Plants.

Column 3: Self-fertilised Plants.

Pot 1 : 96 : 73.
Pot 1 : 86 : 78.
Pot 1 : 69 : 29.

Pot 2 : 84 : 51.
Pot 2 : 84 : 84.
Pot 2 : 76 1/4 : 59.