[157]

[Letter after 7 July 1878, p. 1]

[157v]

[Letter after 7 July 1878, p. 1v]

[Darwin annotation:] (Use of Heliotropism)

(I do not think I said anything about function of circumnutation of Cotyledon & Hypocotyls)

[158]

Frank July 12 1878

"I cut sections of Oat 3mm above ground, & it was about as green as the 5mm one.

Sacks cd not exactly say whether it cd assimilate, but it cd want light to fully develop its chlorophyll, just as much as it wants light to make starch out of its perfect chlorophyll"

[158v]

and carry pollen from

they insects are excluded, the [text excised]

be shown produce very extrem [text excised]

wild parents plants which y [text excised]

have been intercrossed [text excised]

= tions. It seemed ther [text excised]

the difference between th [text excised]

been due to a single [text excised]

I attributed to the result [text excised]

not having been well r [text excised]

[Cross and self fertilisation, p. 9: "Bees incessantly visit the flowers of this Linaria and carry pollen from one to the other; and if insects are excluded, the flowers produce extremely few seeds; so that the wild plants from which my seedlings were raised must have been intercrossed during all previous generations. It seemed therefore quite incredible that the difference between the two beds of seedlings could have been due to a single act of self-fertilisation; and I attributed the result to the self-fertilised seeds not having been well ripened, improbable as it was that all should have been in this state, or to some other accidental and inexplicable cause."]