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
8°. 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
2° 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.
6° shortest way to me & Right
7 . 20 ' to right
9 . 10 to light & left
10 . 50 from light

30' 6° 50'.— bowed down— out of sight

 
Dec. 30th 8° .15 younger tendril— another plant

9° 30 to light
10 15 to left— t. bowed
11° 20 do. — t. much bowed
1 50 to right
3°—    circle almost completed
3 . 55 from light (too oblique to be safe)
───
31' 8° 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."]


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

File last updated 18 December, 2025