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From G. H. Darwin   23 October 1877

Summary

Loss of water from leaf surfaces; action of a still air layer.

Proposal for CD’s LL.D.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  23 Oct 1877
Classmark:  DAR 162: 66
Letter no:  DCP-LETT-11200

From G. H. Darwin   [28 October 1877]

Summary

Writes again about arrangements for the honorary degree ceremony.

Has been working on tides, which he is almost certain have altered the obliquity of the ecliptic.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [28 Oct 1877]
Classmark:  DAR 210.2: 60–1
Letter no:  DCP-LETT-11213

To G. H. Darwin   [after 28 October 1877]

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Summary

Has given dates [for the Cambridge University honorary degree] to the Vice-Chancellor.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  [after 28 Oct 1877]
Classmark:  DAR 210.1: 60
Letter no:  DCP-LETT-11216

To G. H. Darwin   21 November [1877]

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Summary

Asks GHD to determine whether there are worm-castings in cloisters of [Neville?] Court.

Enjoyed his visit to Cambridge. Asks for newspaper account of the LL.D.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  21 Nov [1877]
Classmark:  DAR 210.1: 64
Letter no:  DCP-LETT-11246

From G. H. Darwin   22 November 1877

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Summary

Will look for worm-castings in the cloisters,

and will send CD items from the Cambridge papers on the honorary degree.

Has hit on a possible fallacy in W. Thomson’s theory of secular cooling of the earth.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  22 Nov 1877
Classmark:  DAR 210.2: 62
Letter no:  DCP-LETT-11247

From G. H. Darwin   [23 November 1877]

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Summary

Asks CD if he would like to sign GHD’s Royal Society proposal for membership.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [23 Nov 1877]
Classmark:  DAR 210.2: 63
Letter no:  DCP-LETT-11249

To G. H. Darwin   24 November [1877]

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Summary

Thinks he had better not sign GHD’s paper [as a candidate for F.R.S.], since he obviously is no judge of the quality of his work.

Asks if Thomson did not overlook heat generated by the crushing and folding of strata during the refrigeration of the globe.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  24 Nov [1877]
Classmark:  DAR 210.1: 65
Letter no:  DCP-LETT-11251

From G. H. Darwin   28 January 1878

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Summary

Has been reading Samuel Haughton on geological time ["Notes on physical geology, no. III", Proc. R. Soc. Lond. 26 (1877): 534–46]. It is utter rubbish. Asks whether CD thinks GHD should write a critical note on the subject [see Nature 17 (1878): 509–10].

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  28 Jan 1878
Classmark:  DAR 210.2: 65
Letter no:  DCP-LETT-11336

To G. H. Darwin   3 February [1878]

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Summary

CD at first thought GHD should not answer Haughton [see 10689], but Hooker thinks if no correction is made Haughton’s error will be quoted for 20 years. CD is now inclined to agree.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  3 Feb [1878]
Classmark:  DAR 210.1: 67
Letter no:  DCP-LETT-11345

From G. H. Darwin   [before 9 May 1878]

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Summary

Recounts some figures relating deaf-mutism and consanguineous marriages.

GHD has failed to be elected to the Royal Society.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [before 9 May 1878]
Classmark:  DAR 210.2: 66
Letter no:  DCP-LETT-11498

To G. H. Darwin   9 May [1878]

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Summary

CD believes few or none have attributed deaf-mutism to consanguineous marriages.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  9 May [1878]
Classmark:  DAR 210.1: 68
Letter no:  DCP-LETT-11500

From G. H. Darwin   [30 June 1878]

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Summary

Is frustrated to see, from a paragraph in Nature [18 (1878): 242], that Charles Lagrange has got hold of the same sort of ideas as he has.

Erasmus is unwell.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [30 June 1878]
Classmark:  DAR 210.2: 67
Letter no:  DCP-LETT-11573

To G. H. Darwin   10 [July 1878]

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Summary

Asks for sketches of [Thalia] pistil, in which he is much interested.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  10 [July 1878]
Classmark:  DAR 210.1: 69
Letter no:  DCP-LETT-11597

From G. H. Darwin   [before 11 July 1878]

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Summary

Refers to Charles Lagrange, who is working on the same subject as GHD, but in a fundamentally different way.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  [before 11 July 1878]
Classmark:  DAR 210.2: 68
Letter no:  DCP-LETT-11600

To G. H. Darwin   11 [July 1878]

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Summary

Rejoices that "Lagrange’s case does not seem very bad".

CD is working hard at dissecting Thalia. Has recovered some handiness with microscope.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  11 [July 1878]
Classmark:  DAR 210.1: 70
Letter no:  DCP-LETT-11601

From G. H. Darwin   12 July 1878

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Summary

Sends drawings of specimens [of Thalia] CD requested.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  12 July 1878
Classmark:  DAR 209.13: 14–15, DAR 210.2: 69
Letter no:  DCP-LETT-11602

To G. H. Darwin   13 [July 1878]

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Summary

Thanks GHD for his drawings [of Thalia]. Some parts need attention.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  13 [July 1878]
Classmark:  DAR 210.1: 71
Letter no:  DCP-LETT-11603

To G. H. Darwin   14 [July 1878]

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Summary

Writes to say that the point on which he thought GHD’s drawings were mistaken proves to be an error in his own observation.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  14 [July 1878]
Classmark:  DAR 210.1: 72
Letter no:  DCP-LETT-11606

To G. H. Darwin   17 [August 1878]

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Summary

He and Emma rejoice that GHD’s mathematical troubles are at an end. It is miraculous that he unconsciously followed the right course – like composing a sonata by a fluke.

Author:  Charles Robert Darwin
Addressee:  George Howard Darwin
Date:  17 [Aug 1878]
Classmark:  DAR 210.1: 73
Letter no:  DCP-LETT-11663

From G. H. Darwin   10 October 1878

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Summary

Recounts the experiments on Fechner’s law he has found in Helmholz; they are on the smallest perceptible differences of illumination. Describes how to test whether plants’ responses to lights are in accordance with it.

Author:  George Howard Darwin
Addressee:  Charles Robert Darwin
Date:  10 Oct 1878
Classmark:  DAR 210.2: 70
Letter no:  DCP-LETT-11722
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