"I have now looked at both lots of specimens, & I think both are the variable L. anatifera.–– I have disarticulated the right-hand scutal valve in both & the umbonal teeth are plain in both … I have hardly any doubt that both are L. anatifera.––"
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
"I have now looked at both lots of specimens, & I think both are the variable L. anatifera.–– I have disarticulated the right-hand scutal valve in both & the umbonal teeth are plain in both … I have hardly any doubt that both are L. anatifera.––"
Sends a paper on denudation ["On modern denudation", Trans. Geol. Soc. Glasgow 3 (1871): 153–90].
Sends notes on left- and right-handedness from observations made on his eldest son as an infant.
Open letter with multiple signatories pleading with the President of France not to exile Élisée Reclus.
Refers to priest who believes in "our ape-like progenitors".
EH’s work on sponges.
Pangenesis.
Describes new edition of Origin [6th]
and his work on plant crossing.
Sends description and measurements of the 18th century courtyard pavement of his house, the stones of which have sunk as a result of earthworm action [see Earthworms, pp. 192–3].
His admiration for the papers of AG [see 8119].
Relates his recent discovery that earthworms have brought to surface no less than 161 tons of dry earth over an area of 10 acres, thus creating the conditions for significant denudation. Would welcome information about the persistence of ridges and furrows in old pasture lands ploughed centuries ago. Do they run down the slopes or transversely? Refers to [A. C.] Ramsay, [James] Croll, Elie de Beaumont, and [Henry] Johnson.
Sends three sheets but keeps one. Suggests looking at a curved field on the way to Orpington.
Action of earthworms and weather on surface soil of old earthworks and fortifications.
Varying depth of top-soil in a ridge-and-furrow field with a depression.
After reading Descent sends two instances of men and animals using the same muscles to express similar emotional states.
Is obliged for valuable letter [see 8123] and encloses queries about the manner of gradual obliteration of ridges or furrows in old pasture lands in various parts of England.
Gives details of his experiment to test his observations of the downward flow of worm-casts.
Refers to [Lyon] Playfair, [A. C.] Ramsay, and AG’s edition of [J. B.] Jukes, [A student’s manual of geology, 3d ed., 1872].
Gives his account of H. M. Butler’s apparently inherited habit.
Discussion of H. Spencer’s views on the origin of music.
Sends MS of section on voice as a means of expression [Expression, pp. 86–93]. CD is dissatisfied with it – wishes he could avoid the subject.
Gives publication date for J. C. Lavater, L’Art de connaître les hommes, 1806–9, edited by J. L. Moreau. The first four volumes appeared in 1806.
Sends abstract, and will bring book on Saturday.