species of Primula. The flowers of Hottonia are cross-fertilised, according to
Muller, chiefly by Diptera.

Mr. Scott made a few trials on a short-styled plant, and found that the
legitimate unions were in all ways more fertile than the illegitimate (1/17.
'Journal of the Linnean Society Botany' volume 8 1864 page 79.); but since the
publication of his paper H. Muller has made much fuller experiments, and I give
his results in Table 1.13, drawn up in accordance with my usual plan:--

TABLE 1.13. Hottonia palustris (from H. Muller).

Column 1: Nature of the Union.
Column 2: Number of Capsules examined.
Column 3: Average Number of Seeds per Capsule.

Long-styled by pollen of short-styled. Legitimate union:
34 : 91.4.

Long-styled by own-form pollen, from a distinct plant. Illegitimate union:
18 : 77.5.

Short-styled by pollen of long-styled. Legitimate union:
30 : 66.2.

Short-styled by own-form pollen, from a distinct plant. Illegitimate union:
19 : 18.7.

SUMMARY:

The two legitimate unions together: