RECORD: Darwin, C. R. 1867.02.27-03.18. A number of seeds of themselves the second generation of Ipomœa purpurea. CUL-DAR77.58. (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 2.2023. 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-DAR 76-79 contain material for Darwin's book Cross and self fertilisation (1876).
[58]
Feb. 27th 3 P.m 1867. A number of seeds, of themselves the second generation, of Ipomœa purpurea were sown; some fert. with produced by much pollen & some by little (& this produced no difference); some half produced fine flowers fertilised by pollen from same, & half by pollen of distinct plant; & the former self-fert certainly germinated first & more numerously in equal times & yet Heavier. On March 1' 8° A.m. of self-fertilised 5 seeds had swollen & 1 germ, whilst of crossed not one, though one germinated was swollen at 5° P.m same day & another germ on March 2d.
[in margin:] About germination of cross & self-fert
On March 5th 8 A m. 30 self-fert. seeds had swollen & germ. & only 10 of crossed had swollen & germ.
March 6th There can be no doubt whatever that self-fert seeds germinate quicker than others. 8th do do decided
18th do do very decided. —
ripeness
[58v]
(Self-fert.) Convolvulus 2d Gen Planted Feb 27th 3°. P.m. (Crossed)
Little Pollen |
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Much Little pollen |
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Swollen |
Germ: |
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Swollen |
Germ: |
March 1st 8 A.m. |
3 |
(1) |
March 2d 8 A.m. |
|
(1) |
― 2. 8 A m |
1 |
|
― 4th . . |
2 |
|
― 3d do |
2 |
(1) |
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2 |
1 |
4' ― |
2 |
(1) |
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|
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5 |
1 |
1 |
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|
|
|
9 |
4 2 13 |
|
5 =4 |
1 |
|
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Much pollen |
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Much pollen |
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March 1 8'A.m. |
2 |
|
March 1'. 5. P.m. |
(1) |
(1) |
2 8 A.m |
1 |
1 (|||) |
― 4th ― |
2 |
|
4th ― |
7 |
(1) |
|
2 1 |
1 (1) |
5 ― |
2 3 |
1 |
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14 15 |
5 = 19/32 —(I think 2 too many by error) |
(5 10 |
2 |
|
For Result—.— (over)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 24 December, 2025