A few of these plants of both lots were transplanted into a
large pot with plenty of good earth, and the self-fertilised plants, not
now being subjected to severe competition, grew during the following
year as tall as the crossed plants; but from a case which follows it is
doubtful whether they would have long continued equal. Some flowers on
the crossed plants were crossed with pollen from another plant, and the
capsules thus produced contained a rather greater weight of seed than
those on the self-fertilised plants again self-fertilised.
CROSSED AND SELF-FERTILISED PLANTS OF THE SECOND GENERATION.
Seeds from the foregoing plants, fertilised in the manner just stated,
were sown on the opposite sides of a small pot (1) and came up crowded.
The four tallest crossed seedlings, at the time of flowering, averaged 8
inches in height, whilst the four tallest self-fertilised plants
averaged only 4 inches. Crossed seeds were sown by themselves in a
second small pot, and self-fertilised seeds were sown by themselves in a
third small pot so that there was no competition whatever between these
two lots. Nevertheless the crossed plants grew from 1 to 2 inches higher
on an average than the self-fertilised. Both lots looked equally
vigorous, but the crossed plants flowered earlier and more profusely
than the self-fertilised. In Pot 1, in which the two lots competed with
each other, the crossed plants flowered first and produced a large
number of capsules, whilst the self-fertilised produced only nineteen.
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