[317]

Bean

July 2d

[data not transcribed]

[317v]

[Other fragments of this are at CUL-DAR209.3.289 and 295.]

flower of the

occur, as according

orifices affect only

quoted in Americ

Fleming It m

foregoing remarks several statements

visits to the same

same kind grow ne

In a flower garden

Æ Oenothera, the polle

=nized, I found not

many flowers of ill

Linaria Other ki

tected in their same

of a plant of Th

completely aborte

though scarcely la

not only with

bees from other

[318]

Bean [sketches]

July 3

[Data and calculations not transcribed]

[318v]

662 51

Chap. E 10

have been acquired by a species before those which prevent self-fertilisation; as it would manifestly be injurious to a plant that its stigma should fail to receive its own pollen, unless it had already become well adapted for receiving pollen from another individual. Some It should also be observed that many plants still possess a high power of self-fertilisation, although their flowers are excellently constructed for cross-fertilisation; for instance, those of many papilionaceous species.

It may be admitted as almost certain that some structures, such as a narrow elongated nectary, or a long tubular corolla, have been developed in

[319]

July 4 Bean

[data not transcribed]

[319v]

[top of page excised]

was a tree bearing numerous hermaphrodite flowers would rarely intercross with another tree unless pollen from a distinct individual were was prepotent over the plants own pollen. Now the separation of the sexes, whether the plant be were anemophilous are entomophilous, would most effectually bar the inter-crossing self-fertilisation, and this may be the cause of so many trees and bushes being diclinous. Or to put the case in another way, a plant would be better fitted for development into a tree, if the sexes were separated, than if it were hermaphrodite; for in the former