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Geikie, Archibald in correspondent 
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From:
Charles Robert Darwin
To:
Archibald Geikie
Date:
20 Dec [1871]
Source of text:
The University of Edinburgh Centre for Research Collections (Gen.1425/71)
Summary:

Asks to borrow AG’s paper on denudation of flat or nearly flat surfaces ["On modern denudation", Trans. Geol. Soc. of Glasgow 3: 153-90]. CD has recently been making some observations he thinks throw a little light on the subject.

Contributor:
Darwin Correspondence Project
From:
Archibald Geikie
To:
Charles Robert Darwin
Date:
24 Dec 1871
Source of text:
DAR 165: 24
Summary:

Sends a paper on denudation ["On modern denudation", Trans. Geol. Soc. Glasgow 3 (1871): 153–90].

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Archibald Geikie
Date:
27 Dec [1871]
Source of text:
DAR 185: 132
Summary:

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.

Contributor:
Darwin Correspondence Project
From:
Archibald Geikie
To:
Charles Robert Darwin
Date:
29 Dec 1871
Source of text:
DAR 165: 25
Summary:

Action of earthworms and weather on surface soil of old earthworks and fortifications.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Archibald Geikie
Date:
30 Dec 1871
Source of text:
DAR 185: 133
Summary:

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].

Contributor:
Darwin Correspondence Project
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From:
Archibald Geikie
To:
Charles Robert Darwin
Date:
7 Dec 1875
Source of text:
Haslemere Educational Museum (LD-8-885-P351)
Summary:

Asks for CD to add his name to James Croll’s application to the Royal Society of London.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Archibald Geikie
Date:
9 Dec 1875
Source of text:
The University of Edinburgh Centre for Research Collections (Gen 524/12 Coll-74/11/12 1. 1)
Summary:

CD has signed James Croll’s certificate [of nomination to Royal Society] with real pleasure.

Contributor:
Darwin Correspondence Project