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To William Forsell Kirby   12 December [1862]

Summary

CD sends thanks for Manual of European butterflies [1862].

Is pleased that WFK does not believe in immutability of species, "a doctrine perfectly adapted to stop philosophical research", and hopes he will publish further.

Notes WFK’s name is the same as the entomologist’s.

Author:  Charles Robert Darwin
Addressee:  William Forsell Kirby
Date:  12 Dec [1862]
Classmark:  American Philosophical Society (Getz 3854)
Letter no:  DCP-LETT-3854

To William Forsell Kirby   9 July [1863]

Summary

CD is particularly struck by WFK’s observations on Corsican and N. American subspecies in his paper ["On the geographical distribution of European Rhopalocera", Trans. R. Entomol. Soc. Lond. 3d ser. 1 (1862–3): [!?bib has 1862–4] 481–92]. Thinks it would be interesting for WFK to examine specimens from the Shetland Islands, for even faint trace of differentiation.

Author:  Charles Robert Darwin
Addressee:  William Forsell Kirby
Date:  9 July [1863]
Classmark:  American Philosophical Society (Getz 4237)
Letter no:  DCP-LETT-4237

From W. F. Kirby   8 September [1863]

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Summary

Describes some cases of geographical distribution of butterflies. Raises the perplexing question of the distribution of Pyrameis atalanta in Europe and P. calliroe in the Canaries.

Author:  William Forsell Kirby
Addressee:  Charles Robert Darwin
Date:  8 Sept [1863]
Classmark:  DAR 205.3 (Letters): 280
Letter no:  DCP-LETT-4297
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1862 (1)
1863 (2)
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