RECORD: Darwin, C. R. n.d. Concretions / In agate - Jasper in possession of Mr Robert Brown. CUL-DAR42.35. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2022. 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-DAR42 contains notes for Darwin's book South America (1846).
[35]
Concretions
In agate - Jasper in possession of Mr Robert Brown almost certainly made up of concretionary circles: many [sketch] consisted of a simple ring (∴ section of hollow sphere) with the same red stone matter inside as outside which on small scale is same process all hollow balls in sandstone &c.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022