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 |
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 |
From Alpheus Hyatt January 1877
Summary
Reports on his work. Relationships of shells found at Steinheim; attempts to elucidate the genesis of different forms.
Author: | Alpheus Hyatt |
Addressee: | Charles Robert Darwin |
Date: | Jan 1877 |
Classmark: | DAR 166: 357, 359 |
Letter no: | DCP-LETT-10760 |
From Alpheus Hyatt 23 May 1881
Summary
Wishes to correct impression of his attitude towards CD’s contribution: CD has successfully explained how differences arise.
Pleased CD will read his book [Tertiary species of Planorbis at Steinheim (1880)].
Author: | Alpheus Hyatt |
Addressee: | Charles Robert Darwin |
Date: | 23 May 1881 |
Classmark: | DAR 166: 360 |
Letter no: | DCP-LETT-13171 |
From Alpheus Hyatt [late] November 1872
Summary
No need to apologise for not quoting AH’s paper on acceleration and retardation.
Agassiz introduced AH to ammonites and entrusted collection to him. Has followed developmental history of each species and placed them within geological formations. Found evolutionary history of species recapitulated only to a degree in individual development. Stages frequently skipped. Explains why young of later animals are like adults that preceded them. Retardation entirely idea of Edward Drinker Cope. Sends paper to explain it. Acceleration can explain degraded forms. Often like youthful stage with which series began. Often resemble old age of earlier series. Regularity of these series incompatible with natural selection. How can selection account for degraded final stages or for predictability of development? Franz Hilgendorf’s Paludinae from Steinheim lake show same parallelism in development. May be possible to reconcile this with selection. But Trochiformis begins to show degradation in beds where it is most numerous and has largest individuals, i.e., where selection seems to be favouring it. Will work on Steinheim shells this winter.
Author: | Alpheus Hyatt |
Addressee: | Charles Robert Darwin |
Date: | [late] Nov 1872 |
Classmark: | DAR 99: 48–55 |
Letter no: | DCP-LETT-8655 |
From Alpheus Hyatt 8 December 1872
Summary
Discusses his theory of acceleration and retardation of development.
Author: | Alpheus Hyatt |
Addressee: | Charles Robert Darwin |
Date: | 8 Dec 1872 |
Classmark: | DAR 145: 365 |
Letter no: | DCP-LETT-8665 |
From Alpheus Hyatt 8 January [1875]
Summary
Encloses report on his paper "Old age characteristics among ammonites", [Proc. Boston Soc. Nat. Hist. 17 (1875): 236–41].
Stability of long inherited characters. Dependence of some recently acquired characters on the environment.
Author: | Alpheus Hyatt |
Addressee: | Charles Robert Darwin |
Date: | 8 Jan [1875] |
Classmark: | DAR 166: 358 |
Letter no: | DCP-LETT-9233 |
Hyatt, Alpheus | (6) |
Darwin, C. R. | (5) |