[237]

Feb. 12' Sun-shine

Pricked one Cot at 4. 27'

[Diagram]

(Used)

Feb 12'

7° P.m Almost closed

8.30 much of plant probably asleep

1030 completely shut

Feb 14 7° a.m well awake

[237v]

so that here the inflorescence consists of more kinds of flowers.*(* J. Scott, Journal of Botany, London. N. Series Vol I 1872 p 161-164) From what we know in other cases of the use of the corolla, coloured bracteæ &c, & from what H. Müllers observations has observed *(a) on the frequency of the visits of insects to the flower-heads of the Umbelliferæ & Compositæ being largely determined by their conspicuousness, there can be no doubt that the increased size of the corolla of the outer flowers, the inner ones being in all the above cases small, serves to attract insects. The result is that Thus cross-fertilisation is thus favoured. Most flowers wither soon after being fertilised, but Hildebrand states has observed *(3)

[Cross and self fertilisation, p. 5: "so that here the inflorescence consists of three kinds of flowers.* From what we know in other cases of the use of the corolla, coloured bracteæ, &c., and from what H. Müller has observed† on the frequency of the visits of insects to the flower-heads of the Umbelliferæ and Compositæ being largely determined by their conspicuousness, there can be no doubt that the increased size of the corolla of the outer flowers, the inner ones being in all the above cases small, serves to attract insects. The result is that cross-fertilisation is thus favoured. Most flowers wither soon after being fertilised, but Hildebrand states‡ that the ray-florets of the Compositæ last for a long time, until all those on the disc are impregnated; and this clearly shows the use of the former.
* J. Scott, 'Journal of Botany,' London, new series, vol. i. 1872, pp. 161-164.
† 'Die Befruchtung der Blumen,' pp. 108, 412.
‡ See his interesting memoir, 'Ueber die Geschlechtsverhältnisse bei den Compositen,' 1869, p. 92."]

[238]

Lychnis githago (Used)

Feb. 13' Cots open at 7° a.m. put in greenhouse till 1°, then in dark cupboard, not shut at all at 4° P.m. —5° perhaps a trace closed

6° not nearly shut

7. 20 very little shut

9° rather more shut than before, yet well open

10 40' P.m do.

Feb 14' 6°. 50' Am well awake

10. 40. P.m. very much shut, but not quite closed

Feb 15 7° a.m wide awake, but Cots never open horizontally