CROSSED AND SELF-FERTILISED PLANTS OF THE SEVENTH GENERATION.
These were raised as heretofore with the following result:--
TABLE 2/8. Ipomoea purpurea (Seventh Generation).
Heights of Plants in inches:
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 84 4/8 : 74 6/8.
Pot 1 : 84 6/8 : 84.
Pot 1 : 76 2/8 : 55 4/8.
Pot 2 : 84 4/8 : 65.
Pot 2 : 90 : 51 2/8.
Pot 2 : 82 2/8 : 80 4/8.
Pot 3 : 83 : 67 6/8.
Pot 3 : 86 : 60 2/8.
Pot 4 : 84 2/8 : 75 2/8.
Total : 755.50 : 614.25.
Each of these nine crossed plants is higher than its opponent, though in
one case only by three-quarters of an inch. Their average height is
83.94 inches, and that of the self-fertilised plants 68.25, or as 100 to
81. These plants, after growing to their full height, became very
unhealthy and infested with aphides, just when the seeds were setting,
so that many of the capsules failed, and nothing can be said on their
relative fertility.
CROSSED AND SELF-FERTILISED PLANTS OF THE EIGHTH GENERATION.
As just stated, the plants of the last generation, from which the
present ones were raised, were very unhealthy and their seeds of
unusually small size; and this probably accounts for the two lots
behaving differently to what they did in any of the previous or
succeeding generations.
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