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To Asa Gray   [after 15 March 1857]


Urges AG to generalise from his observations on the flora of the northern U. S.

Expected to find separation of sexes in trees because he believes all living beings require an occasional cross, and none is perpetually self-fertilising. The multitude of flowers of a tree would be an obstacle to cross-fertilisation unless the sexes tended to be separate.

The Leguminosae are CD’s greatest opposers; he cannot find that garden varieties ever cross. Could AG inquire of intelligent nurserymen on the subject?

Thanks AG for information on protean genera; much wants to know whether their great variability is due to their conditions of existence or is innate in them at all times and places.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  [After 15 Mar 1857]
Classmark:  Archives of the Gray Herbarium, Harvard University (8)
Letter no:  DCP-LETT-2060

To Robert Patterson   10 March [1857]


Asks RP’s help in procuring a specimen of a real Irish rabbit, L. veomicule [Lepus vermicula]?.

Author:  Charles Robert Darwin
Addressee:  Robert Patterson
Date:  10 Mar [1857]
Classmark:  W. E. Praeger 1935, p. 714
Letter no:  DCP-LETT-2062

To J. D. Hooker   15 March [1857]



Separation of sexes in trees [U. S.].

Do plants offer positive evidence for "continuous land" theory?

Protean genera.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  15 Mar [1857]
Classmark:  DAR 114: 193
Letter no:  DCP-LETT-2066

To J. D. Hooker   [21 March 1857]



Ranges of species in large vs small genera: Asa Gray’s compilation fits CD’s expectation.

CD studies seedling mortality in his weed garden.

JDH’s work on Indian flora.

Author:  Charles Robert Darwin
Addressee:  Joseph Dalton Hooker
Date:  [21 Mar 1857]
Classmark:  DAR 114: 192a
Letter no:  DCP-LETT-2067

To Edward Sabine   16 March [1857]


Would rather not serve on Royal Society committee [for a North American exploring expedition]. Suggests subjects for geological investigation.

Author:  Charles Robert Darwin
Addressee:  Edward Sabine
Date:  16 Mar [1857]
Classmark:  The Royal Society (MM4: 39)
Letter no:  DCP-LETT-2241

To John Lubbock   [6 March 1857]


Voting to elect JL [a member of Athenaeum].

Author:  Charles Robert Darwin
Addressee:  John Lubbock, 4th baronet and 1st Baron Avebury
Date:  [6 Mar 1857]
Classmark:  DAR 146: 71
Letter no:  DCP-LETT-2392

To Hugh Falconer   [7 March 1857]


Thinking about HF’s paper on Plagiaulax [Q. J. Geol. Soc. Lond. 13 (1857): 261–82]. Owen might answer that all Purbeck mammals are marsupials.

Author:  Charles Robert Darwin
Addressee:  Hugh Falconer
Date:  [7 Mar 1857]
Classmark:  DAR 144: 26
Letter no:  DCP-LETT-3791