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To Hubert Airy   27 January [1876?]

Summary

Agrees to aid HA in applying for membership in a society.

Author:  Charles Robert Darwin
Addressee:  Hubert Airy
Date:  27 Jan [1876?]
Classmark:  DAR 143: 17
Letter no:  DCP-LETT-10369

From Hubert Airy   2 May 1876

Summary

On his new paper for Royal Society on a point of leaf arrangement. Asks CD to communicate it and "gives some details of its contents", e.g., recorded observations of changing leaf-order on individual specimens.

Comments on a paper by George Henslow ["Helianthus tuberosus", Trans. Linn. Soc. Lond. 26 (1876): 647].

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  2 May 1876
Classmark:  DAR 159: 30
Letter no:  DCP-LETT-10490

From Hubert Airy   3 April 1871

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Summary

Comments on discussion of residual organs in Descent [ch. 1].

Describes his ability to contract the platysma myoides at will.

Suggests reason for loss of voluntary movement of ears in men and monkeys.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  3 Apr 1871
Classmark:  DAR 87: 37–8
Letter no:  DCP-LETT-7657

To Hubert Airy   5 April [1871]

Summary

Discusses loss of voluntary movement of ears in man and monkey.

Author:  Charles Robert Darwin
Addressee:  Hubert Airy
Date:  5 Apr [1871]
Classmark:  DAR 143: 15
Letter no:  DCP-LETT-7659

To Hubert Airy   10 [December] 1871

Summary

Discusses movement of ears and contraction of the platysma.

Discusses phyllotaxy, citing work of Carl Nägeli and Chauncey Wright.

Author:  Charles Robert Darwin
Addressee:  Hubert Airy
Date:  10 [Dec] 1871
Classmark:  DAR 143: 16
Letter no:  DCP-LETT-8060

From Hubert Airy   9 December 1871

Summary

Reply to CD’s letter of 5 Apr 1871 [7659], in which he asked HA for further details on when and how platysma myoides contracts.

Replies to CD’s questions about sources on leaf arrangement.

Gives news of speech and paper about CD.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  9 Dec 1871
Classmark:  DAR 159: 13
Letter no:  DCP-LETT-8101

From Hubert Airy   12 December 1871

Summary

Thanks for letter and reference to Nägeli’s observations on leaf arrangement in the bud.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  12 Dec 1871
Classmark:  DAR 159: 14b (fragile, damaged)
Letter no:  DCP-LETT-8105

From Hubert Airy   31 May 1872

Summary

A review and criticism of Chauncey Wright’s paper on phyllotaxy [Mem. Am. Acad. Arts & Sci. n.s. 9 (1867–73): 379–415]. Does not believe that the "distributive" and "cyclical" properties, which CW claims characterise the existing spiral orders of leaf arrangement, can be shown to be advantageous to plants. CW’s speculations on the origins of the spiral arrangement of leaves are purely hypothetical.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  31 May 1872
Classmark:  DAR 159: 15
Letter no:  DCP-LETT-8362

From Hubert Airy   7 June 1872

Summary

On leaf arrangement. [Badly damaged and almost illegible.]

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  7 June 1872
Classmark:  DAR 159: 14a (fragile)
Letter no:  DCP-LETT-8372

To Hubert Airy?   9 June [1872?]

Summary

Agrees to read paper; warns he lacks mathematical knowledge.

Author:  Charles Robert Darwin
Addressee:  Hubert Airy
Date:  9 June [1872?]
Classmark:  American Philosophical Society (Mss.B.D25.408)
Letter no:  DCP-LETT-8377

From Hubert Airy   [before 15] July 1872

Summary

Outlines his theory on the origin of existing orders of leaf arrangement. Believes spiral and whorled orders have evolved from a primitive distichous arrangement. These arrangements permit a compact bud form of small surface area that can withstand external changes in temperature, and in particular can tolerate frost.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  [before 15] July 1872
Classmark:  DAR 159: 16
Letter no:  DCP-LETT-8412

From Hubert Airy   16 July 1872

Summary

Thanks CD for reading his MS [8412] and for his suggestions.

Clarifies his statement on the contraction of the bud-axis: did not mean to imply that this contraction occurred in an individual’s life-time, rather that it was the effect, after the course of ages, of successive favourable modifications.

Believes the true theory of phyllotaxy will give a convincing illustration and proof of the theory of evolution.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  16 July 1872
Classmark:  DAR 159: 17
Letter no:  DCP-LETT-8414

From Hubert Airy   20 July 1872

Summary

Discusses the significance of the node. Believes, with CD, that it has no independent importance but is merely the consequence of the presence of a leaf. Does not believe a distinction can be made between whorled and alternate leaf arrangements on the basis of the number of leaves springing from a node. The node, as the starting point of a leaf, is subject to any disarrangement which takes place among the leaves.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  20 July 1872
Classmark:  DAR 159: 18
Letter no:  DCP-LETT-8418

From Hubert Airy   21 July 1872

Summary

Corrects a factual error in his previous letter [8418].

Sends specimens illustrative of the "nodal" question.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  21 July 1872
Classmark:  DAR 159: 19
Letter no:  DCP-LETT-8422

From Hubert Airy   24 July 1872

Summary

Responds to CD’s comments on his MS on phyllotaxy.

The initial variation required by his theory would be a slight twist of the bud-axis; believes the frequent twisting of stems and branches renders such a variation possible.

Admits he placed too much emphasis on the importance of frost. He should have spoken more generally of "vicissitudes of climate".

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  24 July 1872
Classmark:  DAR 159: 20
Letter no:  DCP-LETT-8426

To Hubert Airy   24 August 1872

Summary

CD’s son Leonard of the Royal Engineers has applied to Sir George Biddell Airy to be an observer on the Venus Expedition. Leonard failed to mention his qualifications, which CD now relates with the request that HA draw them to his father’s attention.

Author:  Charles Robert Darwin
Addressee:  Hubert Airy
Date:  24 Aug 1872
Classmark:  CUL: Royal Greenwich Observatory archives 6/273 (section 3–4: 348–9)
Letter no:  DCP-LETT-8486A

From Hubert Airy   20 September 1872

Summary

Disputes Thomas Meehan’s observations on the hardiness of exposed buds, and believes bud-scales are for the protection of the bud-leaves. Reiterates his opinion that the phyllotaxy of a plant is determined by causes acting when the leaves are crowded into close contact. Attempts to explain how a different phyllotaxy on the upper and lower parts of the same shoot could have arisen.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  20 Sept 1872
Classmark:  DAR 159: 21
Letter no:  DCP-LETT-8527

From Hubert Airy   24 September 1872

Summary

Thanks for letter, in which CD cited [Anton] Kerner’s alpine observations.

Describes with diagrams the curious disposition of leaves on some Acacia twigs, and points out that his theory should account for these anomalies as well as normal cases.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  24 Sept 1872
Classmark:  DAR 159: 22
Letter no:  DCP-LETT-8532

From Hubert Airy   3 December 1872

Summary

Discusses works lent him by CD: Candolle, Kerner, Braun, Sachs, and CD’s own notes on relative positions of leaves. Plans paper on subject for Royal Society.

Just appointed medical inspector under local government board.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  3 Dec 1872
Classmark:  DAR 159: 23
Letter no:  DCP-LETT-8657

From Hubert Airy   3 January 1873

Summary

HA’s paper on leaf arrangement is almost ready; asks CD to communicate it to the Royal Society. Seeks permission to quote from CD’s notes.

Author:  Hubert Airy
Addressee:  Charles Robert Darwin
Date:  3 Jan 1873
Classmark:  DAR 159: 24
Letter no:  DCP-LETT-8720
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letter (27)
Author
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1871 (5)
1872 (12)
1873 (6)
1874 (2)
1876 (2)
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