[9]

Bignonia capreolata

July 19 & 20th

Anheliotropism

Fig. 210.

Tracing I.

2/3 Scale no lettering

Left Hand Tendril of

(Window)

[data not transcribed]

[9v]

= nate at exactly the same time. The same results will have been gained in several cases by only the one a few, two, or three of the tallest, and finest & healthiest plants on each side of th pots having been measured.

Kölreuter and Gärtner* (*Kenntniss der Befruchtung 1844. p. 345. For Naudin Nouvelles Archives du Muséum. Tom. I. p. 27) have proved that several, sometimes as many as from 50 to 60, pollen-grains are necessary for complete fertilisation: and Naudin found in the case of Mirabilis that if the stigma was fertilised with only one or two of its every large pollen-grains were placed on the stigma, the plants

[Cross and self fertilisation, p. 24: "Some of these causes of error will also have been eliminated by the seeds having been allowed to germinate on bare damp sand, and being planted in pairs; for it is not likely that ill-matured and well-matured, or diseased and healthy seeds, would germinate at exactly the same time. The same result will have been gained in the several cases in which only a few of the tallest, finest, and healthiest plants on each side of the pots were measured.
Kölreuter and Gärtner* have proved that with some plants several, even as many as from fifty to sixty, pollen-grains are necessary for the fertilisation of all the ovules in the ovarium. Naudin also found in the case of Mirabilis that if only one or two of its very large pollen-grains were placed on the stigma, the plants raised from such seeds were dwarfed."]