Pot 10 : 32 1/8 : + : 0.
Total : 525.13 : 420.00 : 265.50.
The average height of the sixteen London-crossed plants in Table 4/47 is
32.82 inches; that of the fifteen intercrossed plants, 28 inches; and
that of the ten self-fertilised plants, 26.55.
So that in height we have the following ratios:--
The London-crossed to the self-fertilised as 100 to 81.
The London-crossed to the intercrossed as 100 to 85.
The intercrossed to the self-fertilised as 100 to 95.
These three lots of plants, which it should be remembered were all
derived on the mother-side from plants of the third self-fertilised
generation, fertilised in three different ways, were left exposed to the
visits of insects, and their flowers were freely crossed by them. As the
capsules of each lot became ripe they were gathered and kept separate,
the empty or bad ones being thrown away. But towards the middle of
October, when the capsules could no longer ripen, all were gathered and
were counted, whether good or bad. The capsules were then crushed, and
the seed cleaned by sieves and weighed. For the sake of uniformity the
results are given from calculation, as if there had been twenty plants
in each lot.
The sixteen London-crossed plants actually produced 286 capsules;
therefore twenty such plants would have produced 357.5 capsules; and
from the actual weight of the seeds, the twenty plants would have
yielded 462 grains weight of seeds.
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