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Darwin, Charles, 1809-1882

"The Different Forms of Flowers on Plants of the Same Species"


Column 7: Weight of Seed in grains.
...
Column 8: Number of good Capsules.
Column 9: Weight of Seed in grains.
The two legitimate unions :
100 : 77 : 71 : 39 :: 100 : 50 :: 100 : 54.
The two illegitimate unions :
100 : 45 : 31 : 11 :: 100 : 24 :: 100 : 35.
We here see that the long-styled flowers fertilised with pollen from the short-
styled yield more capsules, especially good ones (i.e. containing more than one
or two seeds), and that these capsules contain a greater proportional weight of
seeds than do the flowers of the long-styled when fertilised with pollen from a
distinct plant of the same form. So it is with the short-styled flowers, if
treated in an analogous manner. Therefore I have called the former method of
fertilisation a legitimate union, and the latter, as it fails to yield the full
complement of capsules and seeds, an illegitimate union. These two kinds of
union are graphically represented in Figure 1.2.
(FIGURE 1.2. Primula veris.
Graphic representation of two kinds of union between:
Left: Long-styled form.
Right: Short-styled form.)
If we consider the results of the two legitimate unions taken together and the
two illegitimate ones, as shown in Table 1.7, we see that the former compared
with the latter yielded capsules, whether containing many seeds or only a few,
in the proportion of 77 to 45, or as 100 to 58.


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