The fifteen intercrossed plants actually produced 157 capsules;
therefore twenty of them would have produced 209.3 capsules and the
seeds would have weighed 208.48 grains.
The ten self-fertilised plants actually produced 70 capsules, therefore
twenty of them would have produced 140 capsules; and the seeds would
have weighed 153.2 grains.
From these data we get the following ratios:--
NUMBER OF CAPSULES PRODUCED BY AN EQUAL NUMBER OF PLANTS OF THE THREE
LOTS.
NUMBER OF CAPSULES:
The London-crossed to the self-fertilised as 100 to 39.
The London-crossed to the intercrossed as 100 to 45.
The intercrossed to the self-fertilised as 100 to 67.
WEIGHT OF SEEDS PRODUCED BY AN EQUAL NUMBER OF PLANTS OF THE THREE LOTS.
WEIGHT OF SEED:
The London-crossed to the self-fertilised as 100 to 33.
The London-crossed to the intercrossed as 100 to 45.
The intercrossed to the self-fertilised as 100 to 73.
We thus see how greatly the offspring from the self-fertilised plants of
the third generation crossed by a fresh stock, had their fertility
increased, whether tested by the number of capsules produced or by the
weight of the contained seeds; this latter being the more trustworthy
method. Even the offspring from the self-fertilised plants crossed by
one of the crossed plants of the same stock, notwithstanding that both
lots had been long subjected to the same conditions, had their fertility
considerably increased, as tested by the same two methods.
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