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To Francis Darwin   3 June [1879]

Summary

Asks whether canary grass and oats have chlorophyll in their cotyledons.

Has been working hard at circumnutation of leaves to see whether sleep movements are exaggerated circumnutation.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  3 June [1879]
Classmark:  DAR 211: 25
Letter no:  DCP-LETT-11541

To Francis Darwin   [4 February – 8 March 1879]

Summary

Requests some seeds.

Believes the leaves of Phyllanthus sleep like those of Cassia.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [4 Feb – 8 Mar 1879]
Classmark:  DAR 211: 49
Letter no:  DCP-LETT-11815

To Francis Darwin?   [1879–80?]

Summary

Discusses A. B. Frank’s views [Beiträge zur Pflanzenphysiologie (1868)] on how plants position themselves; differences and similarities compared with their own conclusions.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [1879–80?]
Classmark:  Botany School Cambridge (in A. B. Frank, Beiträge zur Pflanzenphysiologie, 1868)
Letter no:  DCP-LETT-11816

To Francis Darwin   [before 25 February 1879]

Summary

CD cannot find his pincers and other tools for microscopical dissection. Does FD know where he should look?

Hopes FD will feel better after "so complete a change" [trip to North Africa].

Sends his love to George.

Bernard gets more charming every day.

CD has been put on a committee for a memorial fund for W. K. Clifford.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [before 25 Feb 1879]
Classmark:  DAR 271.4: 12
Letter no:  DCP-LETT-11883A

To Francis Darwin   21 February [1879]

Summary

Is increasing FD’s allowance.

Has begun his chapter on sleep of plants [for Movement in plants].

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  21 Feb [1879]
Classmark:  DAR 211: 50
Letter no:  DCP-LETT-11899

To Francis Darwin   [before 29 May 1879]

Summary

Try to find and read [a German] account of the fir-trees affected by some fungus which produces upright shoots. CD wants to know whether the case is same as what he has observed in the silver fir. Includes diagram.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [before 29 May 1879]
Classmark:  DAR 271.4: 13
Letter no:  DCP-LETT-12074B

To Francis Darwin   [2 June 1879 or earlier]

Summary

Wants FD to find out what sort of man Ernst Krause is.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [2 June 1879 or earlier]
Classmark:  DAR 211: 51
Letter no:  DCP-LETT-12076

To Francis Darwin   2 June [1879]

Summary

Thanks for FD’s letter describing microscopic work under experienced supervision.

Is glad to hear of C. E. Stahl’s objection to treating plants as mere machines.

Pleased that J. von Sachs has yielded on growth.

Perhaps Stahl will recognise whether the case of the silver fir is the same as that referred to in the German account [see 12074b].

CD has finished the first draft of his essay on Erasmus Darwin’s life and is "heartily sick of the job".

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  2 June [1879]
Classmark:  DAR 271.4: 15
Letter no:  DCP-LETT-12078A

To Francis Darwin   [before 5 June 1879]

Summary

Believes that he will prove that the tip of radicle is the brain as far as geotropism is concerned.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [before 5 June 1879]
Classmark:  DAR 211: 53
Letter no:  DCP-LETT-12084

To Francis Darwin   6 and 7 June [1879]

Summary

Describes his experiments investigating the geotropic responses of radicles.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  6 and 7 June 1879
Classmark:  DAR 211: 54
Letter no:  DCP-LETT-12091

To Francis Darwin   16 June [1879]

Summary

Has given his reasons for believing that twisting of stem is related to circumnutation in Climbing plants.

Tells results of experiments on movement of cotyledons and radicles.

Is getting aerial heliotropic roots from Kew.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  16 June [1879]
Classmark:  DAR 211: 55
Letter no:  DCP-LETT-12111

To Francis Darwin   24 June [1879]

Summary

Movement in plants: Philodendron and Dendrobium.

Will go to London on Thursday to receive Baly Medal. Laura Forster has offered them her house in London.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  24 June [1879]
Classmark:  DAR 271.4: 14
Letter no:  DCP-LETT-12117A

To Francis Darwin   [after 24 June 1879]

Summary

Movement of radicles.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [after 24 June 1879]
Classmark:  DAR 211: 57
Letter no:  DCP-LETT-12121

To Francis Darwin   25 June [1879]

Summary

Suggests experiments to test the response of radicles to light. Considers an alternative term for heliotropism.

Will be curious to have FD’s spiral theory about circumnutation explained to him.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  25 June [1879]
Classmark:  DAR 211: 56
Letter no:  DCP-LETT-12122

To Francis Darwin   [26 June 1879]

Summary

Believes that the response of root tips to being "blinded" with foil is much more interesting than response to cauterisation.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [26 June 1879]
Classmark:  DAR 211: 58
Letter no:  DCP-LETT-12124

To Francis Darwin   28 June [1879]

Summary

Discusses the movements of radicles. His observations show that sensitivity to touch resides in the root tip and he believes that sensitivity to gravity governing geotropic responses is also in the root tip. Would much like to convert Julius von Sachs to his ideas on radicle movement.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  28 June [1879]
Classmark:  DAR 211: 59
Letter no:  DCP-LETT-12128

To Francis Darwin   2 July [1879]

Summary

FD’s experiment shows that caustic does not interfere with the bending of radicles. Believes that the apex is a kind of brain for certain movements, being specialised to receive certain irritations.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  2 July [1879]
Classmark:  DAR 211: 61
Letter no:  DCP-LETT-12132

To Francis Darwin   2 July [1879]

Summary

Stresses importance of ensuring that cauterisation of radicles does not, through injury, prevent movement. Plans an experiment to test for "apheliotropism" in certain radicles.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  2 July [1879]
Classmark:  DAR 211: 60
Letter no:  DCP-LETT-12133

To Francis Darwin   4 July [1879]

Summary

CD gives suggestions concerning FD’s experiments on the radicles of roots. Asks him to find out whether J. von Sachs tried beans. Should also try other gramineous plants.

Bernard looking forward to his father’s return.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  4 July [1879]
Classmark:  DAR 271.4: 16
Letter no:  DCP-LETT-12134A

To Francis Darwin   12 July [1879]

Summary

Notes observations on sensitivity and movement of radicles.

Has finished chapter [of Movement in plants] on sleeping plants and is now looking over heliotropism notes.

Is perplexed by Erasmus Darwin; Erasmus [A. Darwin] likes it, but Henrietta thinks it much too long.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  12 July [1879]
Classmark:  DAR 211: 62
Letter no:  DCP-LETT-12152
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