To Asa Gray 20 January [1880]
Summary
Germination of Delphinium and Megarrhiza.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 20 Jan [1880] |
Classmark: | Archives of the Gray Herbarium, Harvard University (127) |
Letter no: | DCP-LETT-12436 |
To Asa Gray 17 February 1880
Summary
Seed germination.
Strange that his plants [of Megarrhiza] behaved differently from AG’s [see 12455].
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 17 Feb 1880 |
Classmark: | Archives of the Gray Herbarium, Harvard University (128) |
Letter no: | DCP-LETT-12489 |
To Asa Gray 20 March [1880]
Summary
Asks AG to confirm whether Ipomoea leptophylla "makes a great tuber as big as a mangel-wurzel".
Petioles of Cotyledons behave partly like those of Megarrhiza.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 20 Mar [1880] |
Classmark: | Archives of the Gray Herbarium, Harvard University (Walter Deane Autograph Collection) |
Letter no: | DCP-LETT-12541 |
To Asa Gray 24 March [1880]
Summary
Thanks for Megarrhiza seeds and information. Has been greatly interested by Megarrhiza germination.
Samuel Butler has attacked CD over Erasmus Darwin.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 24 Mar [1880] |
Classmark: | Archives of the Gray Herbarium, Harvard University (130) |
Letter no: | DCP-LETT-12545 |
To Asa Gray 19 April 1880
Summary
Thanks for the letter from Volney Rattan [see 12553].
Discusses protective adaptation of seedlings from frost.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 19 Apr 1880 |
Classmark: | University of California, Berkeley, The Bancroft Library (BANC MSS 74/78 z) |
Letter no: | DCP-LETT-12582 |
To Asa Gray 29 January 1881
Summary
Thanks for AG’s reviews [of Movement in plants] in the Journal and Nation [Am. J. Sci. 3d ser. 21 (1881): 245–9 and Nation 32 (1881): 17–18], especially for AG’s comment about Frank Darwin.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 29 Jan 1881 |
Classmark: | Gray Herbarium of Harvard University (130b) |
Letter no: | DCP-LETT-13031 |
To Asa Gray 29 January [1875]
Summary
Asks AG to forward [unspecified] enclosure to Chauncey Wright.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 29 Jan [1875] |
Classmark: | DAR 153: 165 |
Letter no: | DCP-LETT-13813 |
To Asa Gray 25 April [1855]
Summary
Is collecting facts on variation; questions AG on the alpine flora of the U. S.
Sends a list of plants from AG’s Manual of botany [1848] and asks him to append the ranges of the species.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 25 Apr [1855] |
Classmark: | Archives of the Gray Herbarium, Harvard University (1) |
Letter no: | DCP-LETT-1674 |
To Asa Gray 8 June [1855]
Summary
Suggests AG append ranges to the species in the new edition of his Manual.
Is interested in comparing the flora of U. S. with that of Britain and wishes to know the proportions to the whole of the great leading families and the numbers of species within genera. Would welcome information on which species AG considers to be "close" in the U. S.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 8 June [1855] |
Classmark: | Archives of the Gray Herbarium, Harvard University (2) |
Letter no: | DCP-LETT-1695 |
To Asa Gray 21 July [1855]
Summary
Geographical distribution. "Close" species. Hopes AG will write an essay on species.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 21 July [1855] |
Classmark: | Archives of the Gray Herbarium, Harvard University (3) |
Letter no: | DCP-LETT-1725 |
To Asa Gray 24 August [1855]
Summary
"Close" species in large and small genera.
Alphonse de Candolle on geographical distribution [Géographie botanique raisonnée (1855)].
Species variability.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 24 Aug [1855] |
Classmark: | Archives of the Gray Herbarium, Harvard University (10) |
Letter no: | DCP-LETT-1749 |
To Asa Gray 2 May [1856]
Summary
Suggests affinities of the U. S. flora that he considers would be worth investigating. Wants to know the ranges of species in large and small genera.
Questions AG on naturalised plants; whether any are social in U. S. which are not so elsewhere and how variable they are compared with indigenous species. Would like to know of any differences in the variability of species at different points of their ranges and also the physical states of plants at the extremes of their ranges.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 2 May [1856] |
Classmark: | Archives of the Gray Herbarium, Harvard University (4) |
Letter no: | DCP-LETT-1863 |
To Asa Gray 14 July [1856]
Summary
Asks whether Allegheny Mountains are sufficiently continuous so that plants could travel from north to south along them.
Hopes AG’s work on geographical distribution is progressing, as he has questions on plants common to Europe which do not range up to Arctic.
Are intermediate varieties less numerous in individuals than the varieties they connect?
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 14 July [1856] |
Classmark: | Archives of the New York Botanical Garden (Charles Finney Cox Collection) |
Letter no: | DCP-LETT-1926 |
To Asa Gray 24 August [1856]
Summary
Rarity of intermediate varieties.
Variability of introduced plants.
Ranges of plants common to Europe and U. S.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 24 Aug [1856] |
Classmark: | Archives of the Gray Herbarium, Harvard University (36) |
Letter no: | DCP-LETT-1944 |
To Asa Gray 12 October [1856]
Summary
Thanks AG for the first part of his "Statistics [of the flora of the northern U. S.", Am. J. Sci. 2d ser. 22 (1856): 204–32; 2d ser. 23 (1857): 62–84, 369–403]
and for information on social and varying plants.
Would like to know number of genera of introduced plants in U. S.
Is surprised at some affinities of northern U. S. flora and asks for any climatic explanations.
Asks what proportion of genera common to U. S. and Europe are mundane.
Is glad AG will work out the northern ranges of the European species and the ranges of species with regard to size of genera.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 12 Oct [1856] |
Classmark: | Archives of the Gray Herbarium, Harvard University (6) |
Letter no: | DCP-LETT-1973 |
To Asa Gray 24 November [1856]
Summary
Variability of naturalised plants.
Distribution of Arctic/alpine plant species.
Limits to the northern range of plants.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 24 Nov [1856] |
Classmark: | Archives of the Gray Herbarium, Harvard University (5) |
Letter no: | DCP-LETT-1999 |
To Asa Gray 1 January [1857]
Summary
Thanks AG for 2d part of "Statistics [of the flora of the northern U. S.", Am. J. Sci. 2d ser. 22 (1856): 204–32; 2d ser. 23 (1857): 62–84, 369–403].
Is glad AG concludes species of large genera are wide-ranging, but is "riled" that he thinks the line of connection of alpine plants is through Greenland. Mentions comparisons of ranges worth investigating.
Believes trees show a tendency toward separation of the sexes and wonders if U. S. species bear this out. Asks which genera are protean in U. S.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 1 Jan [1857] |
Classmark: | Archives of the Gray Herbarium, Harvard University (7) |
Letter no: | DCP-LETT-2034 |
To Asa Gray [after 15 March 1857]
Summary
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 Asa Gray 9 May [1857]
Summary
Thanks for new part of "Statistics".
Interested in disjoined species; do they tend to belong to large or small genera, and are they generally members of small families?
Is glad AG will tackle introduced plants; has noticed that the proportion of a particular family to the whole flora tends to be similar in introduced and indigenous plants.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 9 May [1857] |
Classmark: | Archives of the Gray Herbarium, Harvard University (9) |
Letter no: | DCP-LETT-2089 |
To Asa Gray 18 June [1857]
Summary
Thanks for AG’s remarks on disjoined species. CD’s notions are based on belief that disjoined species have suffered much extinction, which is the common cause of small genera and disjoined ranges.
Discusses out-crossing in plants.
Has failed to meet with a detailed account of regular and normal impregnation in the bud. Podostemon, Subularia, and underwater Leguminosae are the strongest cases against him.
Author: | Charles Robert Darwin |
Addressee: | Asa Gray |
Date: | 18 June [1857] |
Classmark: | Archives of the Gray Herbarium, Harvard University (9a) |
Letter no: | DCP-LETT-2109 |
letter | (269) |
Darwin, C. R. | (143) |
Gray, Asa | (126) |
Gray, J. L. | (1) |
Gray, Asa | (143) |
Darwin, C. R. | (126) |
Darwin, C. R. | |
Gray, Asa | |
Gray, J. L. | (1) |