The parent-plants also were in
an odd semi-sterile condition. Under these circumstances the superiority
of the self-fertilised plants cannot be fully trusted.
15. Nolana prostrata.
The five crossed plants were to the five self-fertilised in height as
100 to 105; so that the latter seem here to have a small but decided
advantage. On the other hand, the flowers on the parent-plants which
were cross-fertilised produced very many more capsules than the
self-fertilised flowers, in the ratio of 100 to 21; and the seeds which
the former contained were heavier than an equal number from the
self-fertilised capsules in the ratio of 100 to 82.
16. Hibiscus africanus.
Only four pairs were raised, and the crossed were to the self-fertilised
in height as 100 to 109. Excepting that too few plants were measured, I
know of nothing else to cause distrust in the result. The
cross-fertilised flowers on the parent-plants were, on the other hand,
rather more productive than the self-fertilised flowers.
17. Apium petroselinum.
A few plants (number not recorded) derived from flowers believed to have
been crossed by insects and a few self-fertilised plants were grown on
the opposite sides of four pots. They attained to a nearly equal height,
the crossed having a very slight advantage.
18. Vandellia nummularifolia.
Twenty crossed plants raised from the seeds of perfect flowers were to
twenty self-fertilised plants, likewise raised from the seeds of perfect
flowers, in height as 100 to 99.
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