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From Benjamin Dann Walsh   29 April – 19 May 1864

Summary

Recalls being introduced to CD when [undergraduate] at Cambridge.

Sends CD some of his pamphlets

and expresses support of Origin.

Has discovered there are "3 sexes" in the solitary Cynips as well as social insects.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  29 Apr – 19 May 1864
Classmark:  DAR 181: 9
Letter no:  DCP-LETT-4477

To B. D. Walsh   21 October [1864]

Summary

Thanks for letter and memoirs.

Suggests a "rather hopeless experiment" of introducing poisons into tissues of plants on the chance that monstrous growths may be produced.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  21 Oct [1864]
Classmark:  Field Museum of Natural History, Chicago (Walsh)
Letter no:  DCP-LETT-4640

From B. D. Walsh   7 November 1864

Summary

Notes Louis Agassiz’s opinions on CD’s views.

Mating and sexual organs of insects.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  7 Nov 1864
Classmark:  DAR 181: 10
Letter no:  DCP-LETT-4663

To B. D. Walsh   4 December [1864]

Summary

Discusses Agassiz’s misrepresentations of his views and J. D. Dana’s "wild notions".

The reception is friendlier from younger scientists in France, and many of the best men in Germany.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  4 Dec [1864]
Classmark:  Field Museum of Natural History, Chicago (Walsh)
Letter no:  DCP-LETT-4695

To B. D. Walsh   [4 December 1864?]

Summary

Sends J. O. Westwood’s direction.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  [4 Dec 1864?]
Classmark:  Field Museum of Natural History, Chicago (Walsh)
Letter no:  DCP-LETT-4698F

From Benjamin Dann Walsh   1 March 1865

Summary

Sends his paper on "Willow-galls" [Proc. Entomol. Soc. Philadelphia 3 (1864): 543–644].

Lengthy criticism of Agassiz’s views on species as stated in his Essay on classification [1857].

Interested by CD’s trimorphism in Lythrum. Thinks some great mystery may lie in the fact that in some genera, some species are tri-, some di-, and some monomorphic, and in other genera, Apis, Vespa, Bombus, all the known species are dimorphic.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  1 Mar 1865
Classmark:  Field Museum of Natural History, Chicago
Letter no:  DCP-LETT-4778

To B. D. Walsh   27 March [1865]

Summary

Comments on BDW’s papers ["On certain entomological speculations of the New England school of naturalists", Proc. Entomol. Soc. Philadelphia 3 (1864): 207–49; "On insects inhabiting the galls of certain species of willow", ibid. 3 (1864): 543–644]; much is new to CD.

Asks about wide-ranging insect genera,

Rocky Mt. wingless insects,

willow hybrids,

galls,

and other subjects.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  27 Mar [1865]
Classmark:  Field Musuem of Natural History, Chicago (Walsh 3)
Letter no:  DCP-LETT-4797

From B. D. Walsh   29 May 1865

Summary

Discusses several subjects, including examples of "Unity of coloration",

the origin of gall-producing poison,

Wagner’s theory of viviparous larvae,

and stridulation in insects.

Sends a reference supporting CD’s statement in Origin that flies check propagation of horses and cattle.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  29 May 1865
Classmark:  DAR 47: 179, 179a; DAR 207: 18
Letter no:  DCP-LETT-4839

To B. D. Walsh   9 July [1865]

Summary

Thanks BDW for his interesting letter [4839] and for the case of Panagaeus, a genus almost sacred to him since Cambridge days.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  9 July [1865]
Classmark:  Field Museum of Natural History, Chicago (Walsh 4)
Letter no:  DCP-LETT-4867

From B. D. Walsh   12 November 1865

Summary

Acknowledges CD’s paper on "Climbing plants".

Mentions Asa Gray’s complimentary notice in Silliman’s Journal [Am. J. Sci. and Arts 2d ser. 40 (1865): 273–82].

His difficulty in understanding how males of Daphnia or any other genus can produce eggs. If there is no impregnation, how can there be sexual organs? Why call one form male and another female?

He has sent CD his paper on "the new Potato Bug".

Will soon send "On Phytophagi Species & Unity of Coloration". [phytophagic!?]

Complaints about practices of the English Post Office.

His current research and description of the rationale of his experiments.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  12 Nov 1865
Classmark:  Field Museum of Natural History, Chicago (Riley bequest of 1948)
Letter no:  DCP-LETT-4934A

To B. D. Walsh   19 December [1865]

Summary

Discusses a variety of subjects: Cynips, galls, potato bugs,

male Daphnia laying eggs.

His Primula experiment results differ from John Scott’s.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  19 Dec [1865]
Classmark:  Field Museum of Natural History, Chicago (Walsh 6)
Letter no:  DCP-LETT-4952

From Benjamin Dann Walsh   13 March 1866

Summary

On the "bullae" as constant, regular generic characters in Hymenoptera. Disagrees with Louis Jurine ["Observations sur les ailes des hyménoptères", Mem. Accad. Sci. Torino 24 (1820): 177–214].

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  13 Mar 1866
Classmark:  Field Museum of Natural History, Chicago
Letter no:  DCP-LETT-5034

To B. D. Walsh   [19] April [1866]

Summary

CD has followed Lyell’s advice and avoided controversy over Origin but encourages BDW to attack S. H. Scudder and others who argue foolishly or misquote him.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  [19] Apr [1866]
Classmark:  Field Museum of Natural History, Chicago (Walsh 7)
Letter no:  DCP-LETT-5061

From B. D. Walsh   17 July 1866

Summary

On H. A. Dubois’ attack on "Darwin, Huxley and Lyell"

and H. J. Clark’s Mind in nature [1865].

BDW’s work [on Cynipidae].

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  17 July 1866
Classmark:  Field Museum of Natural History, Chicago
Letter no:  DCP-LETT-5159

To B. D. Walsh   20 August [1866]

Summary

On various subjects: Dana’s misquotations,

H. J. Clark’s book Mind in nature [1865],

BDW’s Cynips experiments, galls,

Balbiani’s paper on aphids ["Sur la reproduction et l’embryogénie des pucerons", C. R. Hebd. Acad. Sci. 62 (1866): 1231–4, 1285–9, 1390–4].

Claus and other Germans testing CD’s views of variability in common lower animals.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  20 Aug [1866]
Classmark:  Field Museum of Natural History, Chicago (Walsh 5)
Letter no:  DCP-LETT-5194

From B. D. Walsh   [28 November 1866]

Summary

Says Jacob W. Velie wants to exchange birds’ skins with European naturalist.

Comments on meaning of "Darwinism".

Encloses papers from Practical Entomologist.

Discusses Ornithorhynchus paradoxus

and his paper on willow galls.

Mentions human skull found in California.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  [28 Nov 1866]
Classmark:  American Philosophical Society (Mss.B.D25.324a)
Letter no:  DCP-LETT-5319

To B. D. Walsh   24 December [1866]

Summary

Balbiani’s puzzling observations on Aphis.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  24 Dec [1866]
Classmark:  Field Museum of Natural History, Chicago (Walsh 8)
Letter no:  DCP-LETT-5320

From Benjamin Dann Walsh   [25 February 1867]

Summary

Sends a copy [missing] of a lecture by L. Agassiz on glaciers.

Claims worker wasps can generate additional workers in the absence of the fertile female.

Author:  Benjamin Dann Walsh
Addressee:  Charles Robert Darwin
Date:  [25 Feb 1867]
Classmark:  Darwin Library–CUL (bound with Siebold 1857), ML 1: 248–9
Letter no:  DCP-LETT-5419

To B. D. Walsh   23 March [1867]

Summary

Thanks for Agassiz’s Lectures. Lyell does not believe a word about glacial action of any kind in lowlands of Brazil. Agassiz’s view of glacial movement has been given up by physicists.

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  23 Mar [1867]
Classmark:  Field Museum of Natural History, Chicago (Walsh 9)
Letter no:  DCP-LETT-5455

To Benjamin Dann Walsh   3 April [1869]

Summary

Glad BDW has proved his case on dimorphism of Cynips.

Interested in galls

and BDW’s Cicada articles [Proc. Entomol. Soc. Philadelphia (1864)].

Author:  Charles Robert Darwin
Addressee:  Benjamin Dann Walsh
Date:  3 Apr [1869]
Classmark:  Field Museum of Natural History, Chicago (Walsh 17)
Letter no:  DCP-LETT-5482
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1865 (6)
1866 (6)
1867 (3)
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