[28]

Sept 14

Celery dim Light

Right Hand seeding

Celery Phalaris

Heliotropism

Obscure light

(1)

[29]

Celery Dim Light

Left Hand

Celery

Phalaris

Heliotropism

obscure

light

(2)

[30]

105

Ipomoea

this depends chiefly on whether an average was taken of the seeds alone, or of the pods capsules alone, or of both combined. The relative superiority of the crossed plants is chiefly due to their producing a much greater number of pods capsules, and not to each pod capsule containing a larger average number of seeds. For instance in In the fifth third generation although the crossed & self-fertilised plants produced very many more pods than did the self-fertilised, yet the average number of seeds within the pods of both lots was very nearly the same. capsules in the ration of 100 to 38, whilst the seeds in the capsules on the crossed plants were to those on the self-fertilised plants only as 100 to 94.

In the eighth generation the pods capsules of two self-fertilised plants (not included in the above table) grown in separate pots and thus not subjected to any competition, yielded the large average of 5.1 seeds. per pod.  The lesser number of pods capsules produced by the the self-fertilised plants may be in part explained by but not altogether attributed to their lesser size or height; but is probably in this being chiefly part due to their lesser constitutional vigour, so that they were are not able to compete with the crossed plants growing in the same pots. The seeds

[Cross and self fertilisation, p. 58: "The degree differs greatly; but this depends chiefly on whether an average was taken of the seeds alone, or of the capsules alone, or of both combined. The relative superiority of the crossed plants is chiefly due to their producing a much greater number of capsules, and not to each capsule containing a larger average number of seeds. For instance, in the third generation the crossed and self-fertilised plants produced capsules in the ratio of 100 to 38, whilst the seeds in the capsules on the crossed plants were to those on the self-fertilised plants only as 100 to 94. In the eighth generation the capsules on two self-fertilised plants (not included in the above table), grown in separate pots and thus not subjected to any competition, yielded the large average of 5.1 seeds. The smaller number of capsules produced by the self-fertilised plants may be in part, but not altogether, attributed to their lessened size or height; this being chiefly due to their lessened constitutional vigour, so that they were not able to compete with the crossed plants growing in the same pots. The seeds produced by the crossed flowers on the crossed plants were not always heavier than the self-fertilised seeds on the self-fertilised plants."]