RECORD: Darwin, C. R. 1863. Real angle / 5/13 / Diagram showing position of leaves. CUL-DAR51.A30. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed and edited by John van Wyhe. RN1
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.
A30
5/13 = 138/4615. Real Angle
Diagram showing position of leaves thus numbered.
[diagram] 5
2
13
12
These lower two belong to whorl beneath
A30v
May 10 — 1863
Utterly confounded
All known Angles of Divergence of leaves in a Spire
[sketch]
(1) 120 1/3 120°
(3) 135° = 3/8
137.1 = 8/21
(4) 138°.46 5/13
144° 2/5 (2)
180
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 28 November, 2025