RECORD: Darwin, C. R. 1880.02.26-28. Peas radicles / Conclusions. CUL-DAR209.5.149-151. (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 5.2023. 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-DAR209.5 contains materials for Darwin's book Movement in plants (1880).
[149]
Conclusions
Feb 26'
Of 4 with cards of 4 mm from tip only 1 acted & curved to card
Of 3 cards on tip. one distinctly & 1 doubtfully from card
(3 with cards both at 4 mm & on tip all 3 bent from tip card so may say say of 6 with card on tips, 4 bent from tip-card & 1 doubtful
(Both papers together Conclusion)
Of 9 radicles with cards at 4 mm from tip only 2 acted & now to card.—
Of 11 with cards on tip— 5 acted & 1 doubtfully, curved from cards —
Anyhow in 1 jar saw both opposed actions simultaneously.—
[150]
B
Feb 26 80 8º a.m Radicles Peas — germinated in saw dust suspended over water. Temp 58º-62º— cards on sides & on tips small sqr sand-paper — shell-lac (Almost all the radicles very short &young 5—7 mm.—)
(1) card 4 mm from tip 12º 10' a trace 4º 20' P.m straight with tip curved! (10.30' P.m O)
(2) like (1) 12º 10' perhaps a trace (4º. 42' hardly a trace) (10º. 30' P.m O)
(3) like (1) 12º 10' a trace plain to card 4º 20' plain, if not distorted (10º 30' P.m O)
(4) like (1) (10º 30' P.m O)
(5) card on tip (12º 10' curved from card 4º 20' bent at nearly right angles from card (10º 30' P.m considerably bent
(6) like (5)
(7) like 5) —4º 20' I think little curved
(8) card at 4 mm & on tip same side. (4º 40' distinctly bent from tip card) (10º. 30' P.m do
(9) like (8) (10º 30' P.m bent from tip-card) (27th 8º a.m now nearly straight)
stet (10) like (8) 12º 10' opposite from tip-card (4º 40' greatly bent from tip-card) (10º 30' bent at rt angles from tip-card)
over.
(27th 8º a.m no great change of any kind)
[150v]
Feb 27 1880 8º a.m Peas Radicles (like yesterday)
Feb. 27' 1880 8º a.m Peas Radicles (like yesterday)
(1) card 4 mm fr tip
(2) like (1)
(3) like (1)
(4) like (1)
(5) (like 1) 12º I think curved to.)— 4º 30' P.m Certainly has moved
(6) card on one side of tip
(7) (like 6)
(8) (like 6)
(9) like 6) (12º curved from tip-card.)
(10) (like 6)
over
(4º 25' all same state as at 12º) 10º P.m. same state (28th 8º a.m. no change)
[151]
In the paper of 5 with card at 4 mm from tip only 1 acted & curved to card.— of 5 with cards to tip only 1 acted & & curved from card (see separate note-paper for General Summary)
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 18 December, 2025