[138]

July 31 Mimosa pudica

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[138v]

(616

759

Ch XII

Gen: Con:

the two species of Lobelia & of the individuals of Nicotiana. The species belonging to distinct genera in the same family certainly differ in this respect. as may is be seen in my tables. The effects of cross-and self-fertilisation may be confined either to the growth or fertility of the offspring, but generally extends to both qualities. There does not seem to exist any close correspondence relation between the degree of adaptation of in flowers for cross-fertilisation such as for to the visits of insects of certain groups of insects, and the degree to which these offspring profit by this process we may easily err on this head, as cross fertilisation; but there there are two caused effectually ensuring means which ensuring cross-fertilisation which are not internally distinguishable perceptible, namely self-sel-sterility and the prepotent fertilising influence of pollen from another individual. Lastly it has been shown in a former chapter that there is no close correspondence between the number of seeds produced either by the parent-plants, or by their crossed  self-fertilised offspring, when they these are fertilised by pollen from another plant & & or by their own pollen, and the height, vigour or fertility of the offspring raised from from, such

[139]

Mimosa pudica

Augt. 2d

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139v]

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Ch XII

Gen Con

seeds. This want of corr

from on the number of seeds des production number of seeds produced be

freely which reach reaching the ovules, and this a

reaction between the pollen an

tissues; whereas the growth ar

the offspring will be chiefly determined not

the ovules, but by the nature & perfection of the

their contents of the pollen-grains

→ (one line open)

(Two other A second A pollen important conclusion from my observation is

fertilisation do not result follow from

mere union of the sexual element of

their having been subjected

,or to their having varied

somewhat different condition

that in either case their sexual element

differentiation in their sexual

the inquiry from self-fertile

such differentiation in the sexual element. These

substantiated established by my exper

the Ipomœa and of the Mimulus

ilised for the last seven previous

all the time under the same