RECORD: Darwin, C. R. 1874.07.06-20. Melilotus officinalis. CUL-DAR209.1.101. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 6.2022. 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-DAR209.1 contains materials on circumnutation of leaves and sleep for Darwin's book Movement in plants (1880).


[101]

July 8th 74 9.30

Weighted this afternoon when leaves were awake several middle leaflets: le

[sketches] L R

with bits of matches to try & make them turn the wrong way—

No effect

8 All the leaves as far as I can see have gone to sleep in the same way as when first observed—

(Casually observed on July 11th night & all leaflets facing as before) ie after 5 days

(July 20th 10° P.m. ie after 14 day I again observed a very large number, almost all those that were marked & all were asleep in proper direction. Except 1 with white thread which on 15th I noticed had turned over to wrong side & had moved to that side. — N. B in thus turning to one side it is not the whole sub-petiole which bends, but only the joint on swollen part close to leaflet.

[101v]

[sketches]

Best way to state case is to suppose leaf points to N. & thus if leaf slews so that upper face surface face E. whole leaflet. bends to E. — So with W.—

Big bit of wood not v fair as leaf is slanting already

[101v2]

Melilotus officinalis

(all used)

White = L = 14º [sketch]

Black = R

10 of each to start w

10 black used up—

cut 5 more

— 5 more black white

[5] [do] black

\I have tied on 20 blacks & 15 white —

July 6—74 / July 8 I find 2 whites round one leaf

\ it is 20 black 14 white///


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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 25 September, 2022