RECORD: Darwin, C. R. & Francis Darwin. 1878.10.26-11.18. Oxalis valdiviana / Draft of Forms of flowers. CUL-DAR209.6.155. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and John van Wyhe, edited by John van Wyhe 12.2022. RN2

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR209.6 contains materials for Darwin's book Movement in plants (1880).

The text of the draft corresponds to Forms of flowers, p. 114.


[155]

Oxalis Valdiviana

To see whether Cotyledons grow

(Oldish seedlings with a true leaf formed)

(used)

Oct. 26 2° 35' 1 Pin

from outside of 2 black marks at base of leaf Cot 37 1/2 / 500 of inch

29th 10° 35' am—    37 1/4 / 500 (no growth)

29' 9° P.m Cotyledons well asleep

2 Pins same date - barely 40/500

31st 2.° 20'. 37/300 — after 5 days no growth at base of Co 

10° 40' P.m Asleep

[sketch]

Used

Nov 1 . asleep

2' do

3 Cots greatly raised

31st 2° 20'  Same Leaf

Now measured distance between terminal point, as here indicated    40/500

Thus [sketch]

Nov 3d I make it only 35/500 (—I think I must have mistaken gradation)

certainly has not grown

Nov 4th 10° P.m. 1 Cot raised & not the other

Nov 5 2° 30' P.m ——— 35/500 after 5 days no growth at tip of Cot

Nov 5' 10° 15' Both Cots well raised

—— 6th 10° 15 . do .    do

7 . — much raised, but not vertical ,a 2d leaf emerged

8th 10° P.m much risen. — 9th do — 10° do (11th do. 2 true leaves formed.)

Nov 12' do) 13th little raised) 14th about rectangular) 15th 10°underline a.m Cots considerably beneath a Horizontal plane 10° 15 at right angles. 16th' Cots. Hardly raised

18th not at all raised

[155v]

[top of page excised]

are mature) that the flowers must be cross-fertilised by many insects which visit them. Other species bear bear much less conspicuous flowers which secrete little or no honey, nectar, & are consequently are rarely visited by insects; these are adapted by for self-fertilisation, though still capable of cross-fertilisation. According to Delpino, the Polygonaceæ are generally fertilised by the wind, instead of by insects as in the present genus.)


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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