14.  Thunbergia alata.

The six crossed plants were to the six self-fertilised in height as 100 to 108.  Here the self-fertilised plants seem to have a decided advantage; but both lots grew unequally, some of the plants in both being more than twice as tall as others.  The parent-plants also were in an odd semi-sterile condition.  Under these circumstances the superiority of the self-fertilised plants cannot be fully trusted.

15.  Nolana prostrata.

The five crossed plants were to the five self-fertilised in height as 100 to 105; so that the latter seem here to have a small but decided advantage.  On the other hand, the flowers on the parent-plants which were cross-fertilised produced very many more capsules than the self-fertilised flowers, in the ratio of 100 to 21; and the seeds which the former contained were heavier than an equal number from the self-fertilised capsules in the ratio of 100 to 82.

16.  Hibiscus africanus.

Only four pairs were raised, and the crossed were to the self-fertilised in height as 100 to 109.  Excepting that too few plants were measured, I know of nothing else to cause distrust in the result.  The cross-fertilised flowers on the parent-plants were, on the other hand, rather more productive than the self-fertilised flowers.

17.  Apium petroselinum.

A few plants (number not recorded) derived from flowers believed to have been crossed by insects and a few self-fertilised plants were grown on the opposite sides of four pots.  They attained to a nearly equal height, the crossed having a very slight advantage.

18.  Vandellia nummularifolia.

Twenty crossed plants raised from the seeds of perfect flowers were to twenty self-fertilised plants, likewise raised from the seeds of perfect flowers, in height as 100 to 99.  The experiment was repeated, with the sole difference that the plants were allowed to grow more crowded; and now the twenty-four tallest of the crossed plants were to the twenty-four tallest self-fertilised plants in height as 100 to 94, and in weight as 100 to 97.  Moreover, a larger number of the crossed than of the self-fertilised plants grew to a moderate height.  The above-mentioned twenty crossed plants were also grown in competition with twenty self-fertilised plants raised from the closed or cleistogene flowers, and their heights were as 100 to 94.  Therefore had it not been for the first trial, in which the crossed plants were to the self-fertilised in height only as 100 to 99, this species might have been classed with those in which the crossed plants exceed the self-fertilised by above five per cent.  On the other hand, the crossed plants in the second trial bore fewer capsules; and these contained fewer seeds, than did the self-fertilised plants, all the capsules having been produced by cleistogene flowers.  The whole case therefore must be left doubtful.

19.  Pisum sativum (common pea).