RECORD: Darwin, C. R. [1878].12.28-31 Passiflora gracilis / Draft of Forms of flowers. CUL-DAR209.7.76. (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 8.2022. 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 volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).
[76]
Passiflora— tendril— Dark Light
(over)
Left Hand Plant Right Hand Plant
Dec 28
8º. 15'
8 53' to L & Left (removed muslin Blind
9. 38 do
10 . 35' do
11. 5 to me or from light & to Right
11. 30' off glass in direction of oblique line
12 10' on glass & far to light
12. 40 to Light & far to left
1. 7 to left & little from light
2º 3. far off glass.
2. 45 on glass & to light
3 . 10 to light
3 . 44' to left & light
(Used)
4 . 30' from light & to left
5 . 18 straight from light.
6º shortest way to me & Right
7 . 20 ' to right
9 . 10 to light & left
10 . 50 from light
30' 6º 50'.— bowed down— out of sight
Dec. 30th 8º .15 younger tendril— another plant
9º
9º 30 to light
10 15 to left— t. bowed
11º 20 do. — t. much bowed
1 50 to right
3º— circle almost completed
3 . 55 from light (too oblique to be safe)
───
31' 8º a.m .... t. straight
[76v]
50B
Chapter II.
Hybrid Primulas
The Oxlip a hybrid naturally produced between the Primula veris & vulgaris ─ The differences in structures & function between these two parent species ─ The Effects of crossing the two forms of 10 oxlips into 10 & with the two forms of the parent species ─ Characters of the offspring from oxlips artificially self-fertilised & cross-fertilised in a state of nature─ Primula elator shown to be a distinct species ─ Hybrids from other heterostyled species of Primula ─ Supplementary note on spontaneously produced hybrids in the genus Verbascum.
Spontaneously appearing in a state of nature.
Possible ─ Position reversed with [movement] to light ─ Traced on Horizontal glass ─ movement on [summit] of stick to which stem at base of t. tied ─ dark above & on both sides ─ N.E window with movement traced ─ light behind from room.
[Forms of flowers, p. 55: "The Oxlip a hybrid naturally produced between Primula veris and vulgaris—The differences in structure and function between the two parent-species—Effects of crossing long-styled and short-styled Oxlips with one another and with the two forms of both parent species—Character of the offspring from Oxlips artificially self-fertilised and cross-fertilised in a state of nature—Primula elatior shown to be a distinct species—Hybrids between other heterostyled species of Primula—Supplementary note on spontaneously produced hybrids in the genus Verbascum."]
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 18 December, 2025