RECORD: Darwin, C. R. & Francis Darwin. [1881].02.14. Chalk / Taken from deepest part of of pit at Orchis Bank [Earthworm research notes] CUL-DAR65.75. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Prepared and edited by John van Wyhe 7.2025. 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-DAR65 contains materials for Earthworms.

75

Chalk

Feb 14. [1881]

Taken from deepest part of pit at Orchis Bank —

Powdered, & dried in water bath; chalk dissolved in hydrochloric acid — Residue washed on filter, dried in water bath, & weighed.

Chalk = 111.4 grams

Residue = 1.3

= 1.2 per cent

Return to homepage

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

File last updated 28 July, 2025