RECORD: Darwin, C. R. 1880. [Earthworm research notes]. CUL-DAR64.1.61. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed 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-DAR64.1 contains material for Earthworms, experiments on worms; different locales & photographs and cuttings from journals. All of the textual items in these folders, including this one, have been transcribed in a single file: CUL-DAR63-65.
61
Nov 6 1880
Casting Acid
(1) Fresh brown (ie from depth) castings from Lawn — most distinctly acid by litmus paper.
(2) brown from open Field very acid
(3) (4) both very black from ear hedge in sand-walk slightly not distinctly acid.
(5) rather less black from do — slightly acid
(6 & 7) close to borders of great pile of decayed leaves another the wood — very black & acid.
(Many calcareous matter constitutes acids pancreatic juice does not require acids & [6 words illeg] sucked down leaves [8 lines illeg]
61v
Nov 7th [1880]
Tried 5 castings fresh & old from bottom of chalk valley — some quite white — of all that the light brown, but latter contained much C. of Lime. — None of these 5 produced any effect on litmus paper.)
(Nov 7. 3 castings from near Hedge in Sandwalk very slightly acid
4 castings from lawn acid
Same trials were mainly made to reform those made yesterday
The above castings from near Hedge tried again next morning after being dried & now not acid as if acid had evaporated.
8° 4 more tried fresh from near Hedge of sandwalk & being a trace in 2 of them of acid so not minimally acid.
Mould from narrow flower bed close to Verandah — 4 trials — no vestiges of an effect of acid)
Mould amongst roots near surface of turfs 1 to 1 1/2 inch beneath surface
Spot on lawn drains near Brook 5 bits of mould from same clump all strangely acid.
from near Hedge in Sandwalk — 5 trails not in the least acid.
from border of field 4 trials not in the least acid
Leaf mould from Sand walk found leaf cutting at bottom 7 trials no acid
Again from lawn — 4 spots, one dampest when [illeg] above ground another shew moss & mortar another grass — near field all strangely acid. Ground very poor for having been long mown & never manured — ground [illeg] — acid from lawn does not [illeg]
If mould generally not acid, acid must be generated by decay of vege matter in intestines
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 7 July, 2025