RECORD: Darwin, C. R. 1879. Tendril of Passiflora pundata before N.E. window. CUL-DAR209.7.78. (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. The volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).
78
(May 4th
1/2 circle to light 1° 3'
1/2 circle from light 1° 15' 12'
1/2 circle to light 1° 12' 45'
1/2 ..do to from light 1° 4°.3 14 15'
1/2 to light 1. 40'
To light
1/2 circle Conclusion
1. 3'—
1. 45
1. 40
early in morning & plant disturbed.
Summary
From light
1/2 circle
1. 12
1. 15
Tendril of Passiflora punctata
before N.E. window
May 4th 1879
78bv
May 5
7° 30' almost first light
8° 25' from light semicircle (almost)
10 12 far past — but was not past or nearly up at 10°
[sketch]
so I may say 10° 5' fully light ⨀ completed
10°. 48' pointing from light
11. 15 considerably past
12 47 gone past the semi ⨀ considerably
1°. 34 from light
Conclusion
To light about 55m
From light 1° 40m.
To light less than
Try S. side of House
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 23 December, 2025