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To J. D. Hooker   4 December [1854]

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Summary

Is Bentham’s list of aberrant genera biased by exclusion of genera with many species?

JDH’s belief that Aquilegia varieties are one species is consistent with their great interfertility.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  4 Dec [1854]
Classmark:  DAR 114: 159
Letter no:  DCP-LETT-1610

From J. D. Hooker   5 December [1854]

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Summary

Bentham’s list of aberrant genera: CD’s worry that he eliminated large genera a priori is half right. He eliminated those large, anomalous genera that virtually constitute natural orders. JDH criticises CD’s tabulations of aberrants.

Difficulty of distinguishing affinity and analogy in plants.

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  5 Dec [1854]
Classmark:  DAR 205.9: 388–90
Letter no:  DCP-LETT-1611

To J. D. Hooker   11 [December 1854]

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Summary

Debates aberrant species, e.g., Ornithorhynchus and Echidna, with JDH. CD argues they are result of extinction having removed intermediate links to allied forms.

Studying effects of disuse in wings of tame and wild ducks.

Tabulations showing that number of species in a genus is not correlated with number of genera in an order.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  11 [Dec 1854]
Classmark:  DAR 114: 148
Letter no:  DCP-LETT-1612

From J. D. Hooker   [3 November 1854]

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Summary

JDH’s contempt for R. I. Murchison.

There is a Cyperus species and a Pteris species endemic to hot volcanoes of Ischia. Why are there no other migrators?

Author:  Joseph Dalton Hooker
Addressee:  Charles Robert Darwin
Date:  [3 Nov 1854]
Classmark:  DAR 104: 214–15
Letter no:  DCP-LETT-1629
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