RECORD: Darwin, C. R. 1863.05.08. When we think of alternate leaves or spire of angle of 180°. CUL-DAR45.144. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 10.2022. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library William Huxley Darwin. The volume CUL-DAR45 contains notes for Natural selection chap. 4 'Variation under nature'.
[144]
May 8th — 1863
When we think of alternate leaves or spire of angle of 180°; or of spire of 120°, in which cases alternation does not come in, we see some cause must tend lead leaves to be developed one exactly over the other — Some particular vessels or structures in twig. We have seen that it is not mere presence presence of bundle of vessels; for there are vessels of some Kind in ring all round the twigs.—
But in spiral of 3 leaves on 120° does not each leaf stand in intermediate position at equal distances from all other nearest leaves? could this be effected with 4 or 5 leaves??
[144v]
[calculations not transcribed, crossed]
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 26 October, 2022