RECORD: Darwin, C. R. & Francis Darwin. [1880].06.10. Bits of Sand Paper on Faba. CUL-DAR209.5.87-88. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2023. 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).


(1

Bits of Sand Paper on Faba

Jun 10 9.30 am to 9.45 am

Shellacced with a good lot of shellac bits of sand paper which measured about 1.2 x 1.5 mm with the longer axis horizontal and (rough side surface inwards), so that the edge of the paper nearest the tip of the root is the edge at the dot at a measured distance from tip— Put in damp air in warm dark cupboard

[in margin:] Distance of card

[table not transcribed]

Result Two beans grew badly, so after about 25 hrs only 2 out of 8 showed a bend

I think they were too dry & none grew very well

The lengths of the tips were now

now

1 ─ 6mm

2 ─ 8

3 ─ 9

4 ─ 9

mm

5 ─ 10.5

6 ─ 4.5

7 3.5

mm

8 ─ 10

9 ─ 8

10 ─ 6

[2]

Square of card beneath apex

Ap (2)

Faba "cards" Damp air— Fixed with less shellac than before

15 Beans varying from 18 to 46 mm in length had cards sand paper stuck on at 3 & 4 mm from tip. After 12 1/2 11 hrs only one (No 3) showed any distinct effect, & was so:— [sketch], two others No 6 & 2 very slight bend towards no 3, 6, 2

When examined about 22 1/2 25 hrs from the beginning; No 2 had a sharp bend away; 3 had straightened: 5 slight bend away towards: 6 slight bend away: (all these have grown well) Nr 7, 8, 9 11, 12 had no bend & these had not grown properly. But 10 which has not bent grown well either has bent just at the card towards the card. 13 has a very slight bend towards & has grown well— Nrs 14 & 15 were not recorded unfortunately

Leaving out the 6 radicles that did not grow well, & nrs 14 & 15 as they were not recorded at the end—

There are only 7 roots & only one showed a distinct bend after 25 22 1/2 hrs. Or if one takes the first 12 1/2 hrs there are 9 roots. Of these 7 roots 6 had cards at 4 mm 1 got (No 13) which bent slightly had it at 3 mm

The one that bent (3), also 5 & 6 which showed faint bends towards & away, had card at 4 mm

No 10 which grew badly & yet bent towards card had it at 3 mm.

(Summary 15 radicles of which several did not grow well, after 11 hr 3/15 slightly bent to card: aft 22 1/2 hr 1/7 so bent; but 2 bent from card!! (over)

[2v]

(Cards on beneath tips of radicles of Beans)

Summary 2 papers together after 22 1/2 & 25 h out o 15 radicle, 3 bent to cards


Return to homepage

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

File last updated 26 July, 2023