differ in size in the two forms. The pollen-grains from the short-styled flowers
before they were soaked in water were decidedly broader, in proportion to their
length, than those from the long-styled; after being soaked they were relatively
to those from the long-styled as 100 to 71 in diameter, and more transparent. A
large number of flowers from the two forms were compared, and 12 of the finest
flowers from each lot were measured, but there was no sensible difference
between them in size. Nine long-styled and eight short-styled plants growing
together in a state of nature were marked, and their capsules collected after
they had been naturally fertilised; and the seeds from the short-styled weighed
exactly twice as much as those from an equal number of long-styled plants. So
that the primrose resembles the cowslip in the short-styled plants, being the
more productive of the two forms. The results of my trials on the fertility of
the two forms, when legitimately and illegitimately fertilised, are given in
Table 1.9.

TABLE 1.9. Primula vulgaris.

Column 1: Nature of the Union.
Column 2: Number of Flowers fertilised.
Column 3: Number of good Capsules produced.
Column 4: Maximum Number of Seeds in any one Capsule.
Column 5: Minimum Number of Seeds in any one Capsule.
Column 6: Average Number of Seeds per Capsule.

Long-styled by pollen of short-styled. Legitimate union :
12 : 11 : 77 : 47 : 66.9.

Long-styled by own-form pollen. Illegitimate union :
21 : 14 : 66 : 30 : 52.2.