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 8° a.m Radicles Peas — germinated in saw dust suspended over water. Temp 58°-62°— 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 12° 10' a trace 4° 20' P.m straight with tip curved! (10.30' P.m O)
(2) like (1) 12° 10' perhaps a trace (4°. 42' hardly a trace) (10°. 30' P.m O)
(3) like (1) 12° 10' a trace plain to card 4° 20' plain, if not distorted (10° 30' P.m O)
(4) like (1) (10° 30' P.m O)
(5) card on tip (12° 10' curved from card 4° 20' bent at nearly right angles from card (10° 30' P.m considerably bent
(6) like (5)
(7) like 5) —4° 20' I think little curved
(8) card at 4 mm & on tip same side. (4° 40' distinctly bent from tip card) (10°. 30' P.m do
(9) like (8) (10° 30' P.m bent from tip-card) (27th 8° a.m now nearly straight)
stet (10) like (8) 12° 10' opposite from tip-card (4° 40' greatly bent from tip-card) (10° 30' bent at rt angles from tip-card)
over.
(27th 8° a.m no great change of any kind)
[150v]
Feb 27 1880 8° a.m Peas Radicles (like yesterday)
Feb. 27' 1880 8° a.m Peas Radicles (like yesterday)
(1) card 4 mm fr tip
(2) like (1)
(3) like (1)
(4) like (1)
(5) (like 1) 12° I think curved to.)— 4° 30' P.m Certainly has moved
(6) card on one side of tip
(7) (like 6)
(8) (like 6)
(9) like 6) (12° curved from tip-card.)
(10) (like 6)
over
(4° 25' all same state as at 12°) 10° P.m. same state (28th 8° 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