RECORD: Darwin, C. R. 1879.04.30. Lonicera brachypoda / Proof sheet of Forms of flowers. CUL-DAR209.7.67. (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).
[67]
April 30 1879 Lonicera Brachypoda before N.E. window
Nearer shoot & Tall |
Further shoot & shorter shoot. |
6°. 43' facing from light |
6' 43' faced almost to light |
10° 55' 1/2 ⨀ completed to light, but stem | so vertical cannot be traced with any safety |
10 . 45' 1/2 ⨀going from light completed |
11° 22 apparently gone back to light is becoming more Hooked perhaps diffraction of glass |
2°. 5' 1/2 ⨀ completed facing light going to light |
11. 35 now progressing properly |
semicircle (6° 42 to 10° 45) from light took 4h. 3' |
1°. 45' ⨀ completed |
semicircle ( 10. 45 to 2° 5) to light took 3° 20' |
Semicircle (very doubtful' as shoot extend became almost upright under knob of glass. |
Therefore moved quicker to light than to dark side ! |
Semicircle to light (6°. 43 to 10. 55) took 4° 12' |
Another semicircle from light completed between 2° 5. & 5 7' ie in 3° 2' |
semicircle from light (10. 55' to 1°. 45') took 2°. 50 [=] 1. 22 |
|
Therefore moved slower to light by 1°. 22 |
|
Summary
29th Semicircle from |
Semicircle to light |
2°. 47' |
3°. 8' |
4°. 10' |
4. 30' |
30th 2. 50' |
60 4. 12' [×] 3 [=] 180 |
4. 3' |
3. 20' |
3 3. 2' 112 [-]60 [=] 52 |
[total =] 15. 10. |
Jun 7th 16°. 52' [÷] 5 [=] 3°. 22.4 60 [+] 52 [=] 112 |
|
|
190 [÷] [=] 49.5 |
60 [×] 3 [=] 180 [+] 22.4 [=] 202.4 112 [÷] 5 [=] 22.4 |
3h 60 [×] 3 [=] 180 [+] 49.5 [=] 229.5 |
Mean 202.4 |
|
[67v]
[Dated 'May 1877'. Proof sheet and corrections of Forms of flowers, p. 134.]
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 18 December, 2025