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Darwin Correspondence Project

To Francis Darwin   6 January 1872

Down, | Beckenham, Kent.

Jan 6. 1872

My dear Frank

Very many thanks for all the trouble you have taken. I do not quite understand one or 2 points. You speak of ridges running down the slope; therefore I suppose your wavy line A is a horizontal section of the surface; but if so, how can yr Red letters D & E represent an upper & lower part of the same slope?1 Lastly, I do not feel sure whether the difference in thickness of the slope between top & bottom (where I have put 2 blue crosses) refers to the ridges & furrows, or to the upper & lower part of the slope.

Please to answer this at your leisure & return the enclosed & I am very much obliged for the trouble you have taken | yours affectly | Ch. Darwin

CD annotations

1.2 I suppose … surface; 1.3] ‘Yes’ added above, ink
1.3 but if so, … same slope? 1.4] ‘D & E are only to show that the 2 trenches were not cut across the same furrow’ added above, ink
1.5 difference … between] ‘No texture & color only’ added above, ink
1.6 upper & lower part of the slope. 1.7] ‘No to the top & bottom of trenches only’ added below, ink

Footnotes

Francis’s letter and diagram have not been found in the Darwin Archive–CUL. CD’s notes for Earthworms are in DAR 63–5. Francis wrote his answers to CD’s questions between the lines of the letter; see Francis Darwin’s annotations, at the end of the letter.

Summary

Asks FD questions about his sketch [missing] of ridges and furrows. [FD’s answers are interlined.]

Letter details

Letter no.
DCP-LETT-8147
From
Charles Robert Darwin
To
Francis Darwin
Sent from
Down
Source of text
Natural History Museum (Gen. Lib. MSS/DAR: 29)
Physical description
2pp †

Please cite as

Darwin Correspondence Project, “Letter no. 8147,” accessed on 26 June 2019, http://www.darwinproject.ac.uk/DCP-LETT-8147

Also published in The Correspondence of Charles Darwin, vol. 20

letter