The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. 1881. [Earthworm research notes]. CUL-DAR63.54. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

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-DAR63, CUL-DAR64 and CUL-DAR65 contain a diverse array of materials for Darwin's research on earthworms. All of the textual items in these folders, including this one, have been transcribed in a single file: CUL-DAR63-65.

Jan 22d 1881

In the 2 paths where have been kept for 10 weeks, examined the many bits of tiles in the castings — this shows that same fragment not long kept in gizzard, as does frequency of fragment in intestines — the fragments not discoloured — & I think they show compared with fowl fragments washed — a trace of attrition, but then doubtful.

(4 bits of tiles (red) out of gizzard of above worms, I think that there is perhaps a trace of attrition in 3 of them, but doubtful.)

I have relooked at old bits of rust of gizzards & only 1 of the 4 show any attrition.

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