RECORD: Darwin, C. R. [1879]. Beans / Effect of bits of glass on tips of radicles. CUL-DAR209.5.43-46. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Prepared and edited by John van Wyhe. RN1
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).
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(1
April 5. Bean fixed with long pins vertically on Hilum in damp air in almost darkness. Dark Hand[illeg]
I perpendicular down with glass oblique to Sachs curvature put on about 2º. 30— Ap. 6th 8º a.m curved a little from glass, but glass does not extend to apex. 4º 30' Pm removed glass, for not bent & put on curved card (Ap. 7' 8º a no effect, quite straight— put on fresh & narrower card
4º. 30' not at all bent — put on fresh card more transverse. I see tip brown perhaps injured no effect though thrice tried
Effect of bits of glass on tips of radicles of Bean
II. Ap 5' a little naturally inclined in line of ↑ put on glass so as counteract this curvature— radicle though inclined is straight beyond point of seed-coats— glass plate affixed about 2º. 30
Ap. 6' 8º a.m curved directly away from former direction & at rt angles to Sachs curvature. Ap. 7' quite straight fixed new bit of card, narrow 4º 30' not bent (a)
III — almost vertically down— plat put on so as to increase the slight deflection from perpn perpendicular.— but radicle is straight Plate affixed about 2º 30— Ap. 6th 8º a little curved in direction of Sachs' so tells nothing— 4º. 30' P.m removed glass & put on curved card. (Ap. 7' 8º a.m a little curved from glass plate
IV injured radicle with pin
V. vertically down & short — plate affixed (4º 45) so as to oppose favour Sachs' curvature Ap 6' 8º am curved in Direction of Sachs; removed glass— Ap 7' 8º a.m. tip curved in direction opposite to Sachs curvature
Ap. 6' 8º a.m put on larger splinter so as to go beyond apex & a little way up side.
(over)
43v
No II (a) Ap 7th 4º 30 P.m put on tinfoil more transversely— tip not brown.
⨀ distance of tip to wood to see if growing ⨀
April 8th 8º a.m no effect on any of those on back of Page
(Two beans with old & long radicles which I previously tried with bits of card were well acted on, one had its tip rolled like a French Horn— the other much bowed.)
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Beans curvature of radicle tip of. from pressure
(6.)
Ap 7' 8º. 15' a.m bit of glass— Rad. straight. in all following
4º 35 quite straight— changed card more on tip & thin varnish —(from before soft cushion fixed) (.8th 8º 15' a.m no effect, fixed long bit of sand-paper to same side as before. 4º 30 P.m curved towards paper?) 9th 8º curved from paper
(7) Ap 7th 8º. 15' bit of card (thin) 4º. 35 decidedly curved from card (8th 8º a.m do.) (9th 8º still in same position) (Acted slightly)
(8) Ap 7' 8º 15' tinfoil thicker kind 4. 35 doubtfully & slightly inclined, but may be geotropism—; fresh— tin foil more on tip thin varnish. (8º a.m inclined to one side so cannot be geotropism) 9th 8º a.m, curved but obliquely from tin-foil
(Acted so slightly that doubtfully)
(9) Ap 7' 8º. 15 card 4. 35 straight — thin varnish) (8th 8º. 15 slightly curved from, card, put on sand-paper) (9th 8º a.m same state)
(do
45
(3
Pressure on tip of radicles
(10) Ap .7' 8º 15' glass very narrow— 4º 45' slightly curved inclined but it is in direction of Sachs curvature) (8th. 8º. 15 same state— sand-paper, pressed) (9th 8º a.m no effect) same state)
(11) Ap. 7' 8º 15' card placed so as to encourage Sachs curvature 4º 45' curved somewhat & opposed to Sachs curvature— thin varnish) (8' 8º 15 straight— sand-paper pressed) (9th 8º a.m straight)
(12) Ap 7' 8º 15 card 4º 45' very slightly, hardly perceptibly curved (Ap 8º 8. 30' a.m straight — sand paper, pressed) (9th 8º am no effect) Straight
(13) Ap 7' 8º. 15' glass 4. 45 decidedly curved, but glass has slipped up thin varnish fresh glass) (8º. 8º 30' a.m same curvature as before, sand paper pressed (9th 8º a m very considerably curved upwards or from sand-paper
(Acted somewhat)
(14) Ap 7' 8º 15' tinfoil 4º. 45' perfectly straight— 5º.P. glass thin varnish (8th 8º 30 straight, sand paper pressed) (9th 8º a.m slightly curved from sand-paper
(very slight action)
46
4
April 7th 5º. 15 P.m In cylindrical vessel— Thin varnish used put as much as I could on apex— left for a few minutes to dry.
(15) glass (8th 9º am no effect, pressed sanded paper) 9th 8º a.m no effect
All this M. S nearly useless Kept too Hot
16) Card (8th 9º am no effect, pressed sanded paper) (9th 7º 40' a.m tip curved from card decidedly, though little) (Slight action)
19) seed not germinated
(18) card I believe crooked injured by blow Card—(8th 9º a.m slight curved, on reversed side sanded paper & pressed
(19) young & short radicle glass (8th 9º a.m no effect— pressed sandy paper) (9th 7'. 40' a.m a little curve from sand-paper)
(Slight action)
20 seed not germinated
17 (+) 12 — say Further 7 (=) about 24
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 27 January, 2026