The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. n.d. [Worm notes on chalk]. CUL-DAR65.42. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2021. 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.

Very clean looking chalk from the deepest part of chalk pit between Holwood & Leve's Green 20 or 30 feet below surface –

Chalk – 46.39 grams, residue 0.27 gramms

[calculations] = 0.6 per cent

Abinger

Two samples of chalk from close below surface – (Laura Forster)

I crumbly and reddish in colour

chalk = 39.57 gramms residue 1.45

[calculations] = 3.7 per cent

Abinger

II Cleaner looking hard chalk

Chalk = 43.24; Residue = 1.19

[calculations] = 2.8 per cent

Explain thickness of mould on plains near Stonehenge

Fissures may do much. Horace Brighton

Pot at Down – open

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