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.]


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

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