RECORD: Darwin, C. R. [1878.06].22-24. Caladium / Draft of Cross and self fertilisation, folio 663. CUL-DAR209.14.17. (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 7.2023. 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 volume CUL-DAR209.14 contains material for Darwin's book Movement in plants (1880). The draft is in the hand of Ebenezer Norman with corrections by Darwin. The text of the draft corresponds to Cross and self fertilisation, pp. 382-3.
[17]
Caladium
Left Hand |
right Hand filament attached (to Heel) |
22d |
22d |
8º 30 |
8. 30 |
9. 15 hardy moved |
9. 15 down |
10 15 do |
10 15 |
11. 50 an atom risen |
11. 50' down & little to right |
12. 50 nearly same spot |
12. 53 down |
2º an atom down |
2. do |
3 do |
3 down |
4 do |
4' do |
5 up a little |
5 a good bit up |
6 do |
6º tremendously up |
7º 15 nearly same place |
7. 15 . do. do . do ie apex of leaf greatly depressed |
9º a little up |
9º very far up.— |
23d ⨀ |
10. 25 a little down & to left |
24th |
23d ⨀ 6º 40' am |
|
7º 54 risen |
|
9º fallen considerably |
|
10 do |
|
11 up |
|
12 up |
|
1º up |
|
2º. 25 up & to right crossed line |
|
4º far up |
|
4 .53 far up |
|
6. 37 very high up |
|
7º 10 little higher |
|
8. 50' fallen |
|
24th 6º 50 |
|
8. 5 |
After 8º each morning fell & fell on one day till 4º P.m & on the other day till only 10 a.m & then on both days rose tremendously till 7 or 9º P.m & then fell & so continued to fall all night only slightly zig-zag ascending & descending lines nearly coincide
[Movement in plants, p. 390]
[17v]
52 663
Chap. E 10
expected that plants having their flowers thus peculiarly constructed sh would require to be crossed than ordinary and sh would thus profit in a greater degree by the process than ordinary or simple flowers; but this does not seem to hold good. Thus Tropaeolum minus has a long nectary and an irregular corolla, whilst Limnanthes douglasii has a regular flower and no proper nectary, yet the crossed seedlings of both species are to the self-fertilised in height as 100 to 79.
Salvia coccinea has an irregular corolla, with a curious apparatus by which insects depress the stamens, while the flowers of Ipomœa are regular; and the crossed seedlings of the former are in height to the self-fertilised as 100 to 76, whilst those of the Ipomœa are as 100 to 77. Fagopyrum is dimorphic, and Anagallis collina is non-dimorphic, and the crossed seedlings of both are in height to the self-fertilised as 100 to 69. A flower may, however, be be adapted to certain kinds of insects, independently of its structure, by secreting nectar particularly attractive to them and
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 4 February, 2026