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* direct »Letter 192 — Darwin, C. R. to Henslow, J. S., [26 Oct–] 24 Nov 1832

A French collector [Alcide d'Orbigny] has been at the Rio Negro and will probably have "taken the cream". CD's luck with fossil bones, among them a large extinct armadillo-like animal. Describes some birds, toads, Crustacea, and other marine specimens. Nearly all plants flowering at Bahia Blanca were collected. Is sending two large casks of fossil bones by packet.

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* direct »Letter 603 — Darwin, E. C. to Darwin, C. R., 8 July 1841

Describes the appearance and occurrence of imperfect flowers of "Hex.[?] Trigynia".

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* direct »Letter 607 — Darwin, C. R. to Gardeners' Chronicle, [16 Aug 1841]

Reports detailed observations on humble-bees boring holes in flowers to extract nectar instead of brushing over the stamens and pistils. Some hive-bees seem to use the holes made by the humble-bees; speculates that this would be a case of acquired knowledge in insects.

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* direct »Letter 973 — Darwin, C. R. to Hooker, J. D., 10 Apr [1846]

Is pleased JDH will attend to polymorphism and also with the botanical relation, as stated by JDH, between Africa and Java. Would welcome any information on impregnation in the bud.

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* direct »Letter 1094 — Darwin, C. R. to Hooker, J. D., [2 June 1847]

Encloses quasi-hybrid Laburnum.Suggests a new view of symmetry of flowers. Will discuss coal and species sketch at Oxford [BAAS meeting (1847)].

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* direct »Letter 1096 — Darwin, C. R. to Hooker, J. D., [12 June 1847]

Encloses another specimen of the "bilateral" Laburnum flower.

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* direct »Letter 1572 — Hooker, J. D. to Darwin, C. R., [24 June 1854]

Birth of JDH's second child. Asks CD's view of "highness" and "lowness" in animals. Gives his own for plants; extent of deviation from type, e.g., floral parts deviating from leaf. Reading B. C. Brodie's Psychological inquiries [1854].

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* direct »Letter 1605 — Watson, H. C. to Darwin, C. R., 20 Nov [1854?]

Sends a count of the number of species of flowering plants and ferns on the islands of Fayal and Flores in the Azores.

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* direct »Letter 1721 — Hunt, Robert to Darwin, C. R., 19 July 1855

Discusses how best to simulate the light at a particular point on the earth's surface using coloured glass; considers sunlight as composed of three "principles", varying in proportion according to latitude, which affect germination, lignification, and floriation.

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* direct »Letter 1730 — Hunt, Robert to Darwin, C. R., 24 July 1855

Informs CD which colours of glass accelerate germination, lignification, and floriation; advises CD on obtaining such glass and offers his help in any experiments.

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