RECORD: Darwin, C. R. [1878]. Beans / Radicles. CUL-DAR209.5.19-20. (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).


19

May 22. 78/ 8º 50' a.m Bits of sand-paper & bits of Bristle, thick from Hair-Brush affixed to radicles, several of them crooked already, as recorded object always affixed so as to counter act the preexisting curvature

(1) curved to right at 35º? & Sachs to Sachs. Bristle in opposition to above curvature 4º. 45 P.m curved from Bristle no effect —(23d. 8º 15 a.m no effect    Y

I do not think cases worth giv

(or I might give 2 or 3 of them)

/not used

(2) curved to right & little opposed to Sachs bit square of Sand-paper  in opposition 4º 45 curved at about 45 from perpendicular & from Card, the former curvature to right obliterated & no longer curved in opposition to Sachs (23d 8º 15 little effect now apparent)

(3) straight)—  Bristle on back (4º 45 no effect) (23 '8º 15 no effect)

(4) (Straight) Bristle on right side (4.º 45', perhaps very slightly curved from Bristle 23d 8º 15 do no effect

(5) (straight) Bristle on right side (4º 45, possibly a trace of curvature (23' 8º 15' no effect)

(7) curved at 45º to left & not at all to Sachs'

Used.

Card in opposition (4º 45, basal part still so sloped, but tip bent at 45º from card & perpendicular — (23d 8º 15. terminal portion quite straight

over

19v

(8) Curved to Sachs & to left somewhat, card in opposition (4º. 45 Pm basal part same curvature, but tip straight which shows that card has probably acted.— (Used) (23d 8º 15'. terminal portion now bent at 45' from perpendicular & from card.

Temp of Study 64º— The 3 with square of sand paper to be added to numbered experiments

Used

(I certainly think that when Bean germinate at Temp betw 55º & 60º Sachs' curvature not so well pronounced as I have seen it at higher temps & as appeared to have occurred with Sachs,.) 

Summary Bristle

(within 24º.)

11 Trials— 8 no effect— 3 acted, of wh 2 nearly right angles (one of with

1 with 8º 15' at 90º

2 with 9º- at 90, after 24º reduced to 19

3 slightly deflected aft 9º (+) 15 but brush slipped upward aft 24º from time of 15º additionally [illeg] deflection amounts to 26º degrees.

20

Radicles of Beans cut off very obliquely with sharp scissors conical apex on one side of 6 Beans; not very good specs— Dark Study Table 61º to 62º

May 23d 8º 35' a.m   (5º P.m I can perceive no effect)

My 24th 8º a. m no clear effect—

Now sliced with pen-knife in same direction, but radicle too old)

24th 4º 30' P.m no effect

25th 8º a.m No effect

(A) bent to right & Sachs, terminal portion straight

(C) straight

(D) straight

(G) bent much to left terminal portion straight

(I) tip bent from Sachs

(L) a little bent to Sachs, but tip straight

  (6 cases with scissors)

   no effect


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

File last updated 28 January, 2026