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Darwin Correspondence Project

DCP-LETT-8658

To Alpheus Hyatt   4 December [1872]1

This letter is not yet available online.

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.

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.

Letter details

Letter no.
DCP-LETT-8658
From
Darwin, C. R.
To
Hyatt, Alpheus
Sent from
Down
Source of text
Maryland Historical Society: The Alpheus Hyatt Papers 1859–1928 (MS 1007)
Physical description
12pp & AdraftS 7pp

Please cite as

Darwin Correspondence Project, “Letter no. 8658,” accessed on 28 September 2016, http://www.darwinproject.ac.uk/DCP-LETT-8658

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