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To Alpheus Hyatt   14 December [1872]

Summary

Sends copy of last edition of Origin.

Respecting AH’s theory that acceleration of growth produces new characters, urges AH to examine decapods that do and do not pass through zoea stage. Believes there are no marked differences between them.

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  14 Dec [1872]
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-8678

To Alpheus Hyatt   21 January [1875]

Summary

Thanks for note and extract.

Will be glad to read AH’s memoir when published [? "The Jurassic and Cretaceous Ammonites collected in South America by Prof. James Orton" Boston Soc. Nat. Hist. [Proc Mem Jnl!?] 17 (1875): 365–72].

Recalls AH’s visit to Down.

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  21 Jan [1875]
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-9826

To Alpheus Hyatt   13 February 1877

Summary

Regrets that F. Hilgendorf proved so greatly in error ["Planorbis Multiformis", Monatsber. K. Akad. Wiss. Berlin (1866): 474–504; "Noch einmal Planorbis Multiformis", Z. Dtsch. Geol. Ges. 29 (1877): 50–62].

Discusses polymorphic species.

Surprised that shell form developed from various different progenitors.

Reminds CD of C. Nägeli’s conclusions on Hieracium.

But still retains belief expressed in first edition of Origin that variation in protean species is neither advantageous nor disadvantageous.

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  13 Feb 1877
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-10842

To Alpheus Hyatt   8 May 1881

Summary

Aware that AH thinks CD has done nothing to advance the good cause of the descent theory.

Obliged for gift of AH’s [Tertiary species of Planorbis at Steinheim (1880)].

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  8 May 1881
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-13151

To Alpheus Hyatt   10 October [1872]

Summary

Thanks for "Embryology of the fossil cephalopods", [Bull. Mus. Comp. Zool. Harvard 3 (1872–4): 59–112].

Regrets error in attributing acceleration concept to E. D. Cope instead of to AH in last edition of Origin, and misrepresentation of their joint view.

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  10 Oct [1872]
Classmark:  Manuscripts Division, Department of Rare Books and Special Collections, Princeton University Library (Hyatt and Mayer Collection Box 2, folder 74)
Letter no:  DCP-LETT-8551

To Alpheus Hyatt   4 December [1872]

Summary

If decapod does not pass through zoea stage, is this acceleration? If hypothetical adult retained zoea characters, would this be retardation? Believes obliteration of growth stages frequently due to natural selection. Most interesting points in AH’s letter deal with senile characters. CD attributes them to laws of growth not selection. Explains degraded characters as result of readaptation to simpler conditions. Believes no innate tendency to progressive development exists.

Hopes AH visits F. Hilgendorf’s famous deposit [at Steinheim]. A. Weismann [Einfluss der Isolierung (1872)] makes good use of Hilgendorf’s observations.

Author:  Charles Robert Darwin
Addressee:  Alpheus Hyatt
Date:  4 Dec [1872]
Classmark:  Maryland Historical Society (Alpheus Hyatt Papers MS 1007)
Letter no:  DCP-LETT-8658
Document type
letter (6)
Author
Darwin, C. R.[X]
Addressee
Correspondent
Darwin, C. R.[X]
Hyatt, Alpheus[X]
Date
1872 (3)
1875 (1)
1877 (1)
1881 (1)
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