64 : 78.8.

The two illegitimate unions together:
37 : 48.1.

The most remarkable point in this table is the small average number of seeds
from the short-styled flowers when illegitimately fertilised, and the unusually
large average number of seeds yielded by the illegitimately fertilised long-
styled flowers, relatively in both cases to the product of the legitimately
fertilised flowers. (1/18. H. Muller says 'Die Befruchtung' etc. page 352, that
the long-styled flowers, when illegitimately fertilised, yield as many seeds as
when legitimately fertilised; but by adding up the number of seeds from all the
capsules produced by the two methods of fertilisation, as given by him, I arrive
at the results shown in Table 1.13. The average number in the long-styled
capsules, when legitimately fertilised, is 91.4, and when illegitimately
fertilised, 77.5; or as 100 to 85. H. Muller agrees with me that this is the
proper manner of viewing the case.) The two legitimate unions compared with the
two illegitimate together yield seeds in the ratio of 100 to 61.

H. Muller also tried the effects of illegitimately fertilising the long-styled
and short-styled flowers with their own pollen, instead of with that from
another plant of the same form; and the results are very striking. For the
capsules from the long-styled flowers thus treated contained, on an average,
only 15.7 seeds instead of 77.5; and those from the short-styled 6.5, instead of
18.7 seeds per capsule. The number 6.5 agrees closely with Mr. Scott's result
from the same form similarly fertilised.

From some observations by Dr. Torrey, Hottonia inflata, an inhabitant of the
United States, does not appear to be heterostyled, but is remarkable from
producing cleistogamic flowers, as will be seen in the last chapter of this