RECORD: Darwin, C. R. 1878.01.06-09. Entoca viscida. CUL-DAR209.8.68. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 7.2022. 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 volumes CUL-DAR209.7-8 contain notes on heliotropism (phototropism) for Darwin's book Movement in plants (1880).


[68]

Entoca

Jan 6' 78 Entoca viscida— exposed to Lamp at 10° 45, removed 4. 45'

Seedlings bowed in opposite direction to light

(4) & (5) stems painted for .2 down with Olive oil & Lamp-black

Oil & Lamp-Black very poisonous

(6) Bot. Cots cut off close to bud— Upper part slightly bowed to light.—

Free Plants upper part of stem from .2 to .25 bowed so as to stand horizontally

When 4 & 5 quite vertical, no trace of bowing, but as painted so low as .2, & as bowing does not extend to ground evidence as yet worthless

For Geotropism at 11° 15 In dark cupboard— removed 4° 40'

Jan 8' (C) (D) (E) whole stem painted with olive oil—

Jan 9th entirely stopped all apogeotropism stopped

Apogeotropism

(F) upper part of stem with granular Indian ink & Olive oil ─In all these apogeotropism entirely stopped.

(15) two seedlings with Indian Ink— rubbed with oil on upper part of stem

(16) & (17) on upper part of stem Lamp-black & Indian Ink

[in margin:] N.B I find the Entocas are killed Jan 8th by Lamp-black & Olive oil

4 grass with Lamp Bla & Olive oil: vertical Lamp 11° 40' Heliotropism

(5) Entoca upper part of stem with olive oil & lamp black: curved but not to light

(6) Grass with Indian ink & olive oil: vertical

(21) & (22) Entoca upper part of stem with Indian ink & Olive oil

(21) Cot. not directed to light: (22) prostrate on ground as if much injured,

N.B These mixture of oil & Blacks stop all movement, but as they injure Plant — nothing can be inferred.—


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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