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To Fritz Müller   23 February 1881

Summary

CD interested by FM’s facts on movement of plants; has sent some to Nature ["Movement of leaves", Collected papers 2: 228–9]. Greatly admires FM’s work. Suggests an experiment to investigate movement in Phyllanthus.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  23 Feb 1881
Classmark:  The British Library (Loan MS 10 no 49)
Letter no:  DCP-LETT-13064

To Fritz Müller   20 March 1881

Summary

FM’s view on meaning of two-coloured stamens in many flowers; CD has been looking through his old notes on dimorphism for supporting evidence. Intends to send extract of FM’s letter to Nature or to Linnean Society.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  20 Mar 1881
Classmark:  The British Library (Loan MS 10 no 50)
Letter no:  DCP-LETT-13091

To Fritz Müller   12 April 1881

Summary

Earthworm book with printer.

Has sent FM’s observations on paraheliotropism to Nature ["Movement of leaves", Collected papers 2: 228–9].

Plants with differently coloured anthers.

Intends gathering together his notes on "bloom".

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  12 Apr 1881
Classmark:  The British Library (Loan MS 10 no 51)
Letter no:  DCP-LETT-13113

To Fritz Müller   21 June 1881

Summary

Wants seeds of heterostyled plants to test fertility of illegitimate seedlings.

Offers £100 to FM to replace books lost in flooding.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  21 June 1881
Classmark:  The British Library (Loan MS 10 no 52)
Letter no:  DCP-LETT-13212

To Fritz Müller   4 July 1881

Summary

Movement of plants to shake off water: FM’s invaluable observations.

Inquires about "bloom" on leaves.

Fertilisation of Melastomataceae, roles of the two sets of anthers.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  4 July 1881
Classmark:  The British Library (Loan MS 10 no 53)
Letter no:  DCP-LETT-13233

To Fritz Müller   10 September 1881

Summary

Has sent FM’s account of Pandanus and Oxalis to Nature ["Leaves injured at night by free radiation", Nature 24 (1881): 459].

Is crossing heterostyled plants.

Hopes to get his notes on bloom together.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  10 Sept 1881
Classmark:  The British Library (Loan MS 10 no : 54)
Letter no:  DCP-LETT-13326

To Fritz Müller   22 October 1881

Summary

Is in Cambridge with his son, resting

and reading F. M. Balfour’s Comparative embryology [1880–1].

Sent FM a copy of Earthworms.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  22 Oct 1881
Classmark:  The British Library (Loan MS 10 no 55)
Letter no:  DCP-LETT-13419

To Fritz Müller   13 November 1881

Summary

Is experimenting with effect of ammonium carbonate on chlorophyll and roots, but finds the results confusing.

Julius von Wiesner has published a book reinterpreting CD’s observations in Movement in plants [see 13422].

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  13 Nov 1881
Classmark:  The British Library (Loan MS 10 no 56)
Letter no:  DCP-LETT-13481

To Fritz Müller   19 December 1881

Summary

Waxy secretion or "bloom" on leaves.

FM’s article on Crotalaria.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  19 Dec 1881
Classmark:  The British Library (Loan MS 10 no 57)
Letter no:  DCP-LETT-13564

From Fritz Müller   31 May 1881

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  31 May 1881
Classmark:  Möller ed. 1915–21, 2: 410–11
Letter no:  DCP-LETT-11385A

From Fritz Müller   9 January 1881

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Summary

Thanks for CD’s offer of assistance after flood damage.

Comments on Movement in plants. Discusses sleep movements and paraheliotropism of Maranta and other plants.

Describes the fertilisation of figs by Hymenoptera.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  9 Jan 1881
Classmark:  DAR 99: 217–20
Letter no:  DCP-LETT-12996

From Fritz Müller   7 February 1881

Summary

Describes variability in the stamens and pollen of Lagerstroemia, which CD spoke of in Forms of flowers.

Also reports on similar phenomena in Pontederiacea (Heteranthera reniformis).

Has received from Paul Mayer an interesting paper on metamorphosis in Palaemonetes varians, which is also being studied by J. E. V. Boas in Denmark. Shows differences between larval development in Danish forms and those found in southern Italy.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  7 Feb 1881
Classmark:  Möller ed. 1915–21, 2: 406–7
Letter no:  DCP-LETT-13041A

From Fritz Müller   28 February 1881

Summary

In his last letter FM told CD about four flowers of Lagerstroemia that he had fertilised with the yellow pollen of another variety or species and which had subsequently fallen off. He has now repeated the experiment using the yellow pollen of a different variety and successfully produced good fruit as large as that fertilised with green pollen.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  28 Feb 1881
Classmark:  Möller ed. 1915–21, 2: 409
Letter no:  DCP-LETT-13068A

From Fritz Müller   31 May 1881

Summary

Has just received CD’s letter of 12 April [13113]. To answer CD’s query, Heteranthera reniformis is an amphibious plant that grows as well on moist ground as it does in ditches filled with water.

For the past few weeks has been observing Phyllanthus plants that had shown the irregular movement in leaves returning from the positions assumed at night, but none has repeated the irregularity. Perhaps the progeny from the seeds he has collected will inherit the tendency for irregular movement.

Describes his observations of the power of movement in Cassia, Desmodium, and a few other plants.

Paul Mayer has identified seven new species of insects FM found in nine different species of figs.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  31 May 1881
Classmark:  Möller ed. 1915–21, 2: 410–11
Letter no:  DCP-LETT-13185A

From Fritz Müller   9 and 10 August 1881

Summary

Thanks CD for his letter of 21 June [13212].

Is sending seeds of Oxalis sepium, which came from a cross between a plant with long pistils and another with pistils intermediate in length. Perhaps some of the plants that come from them will have short pistils.

FM does not know who told Dr B [Wilhelm Breitenbach] that he had lost a whole library in the flood. In fact, he lost only a few books that he had left behind thinking they were safe where they were.

Has taken the opportunity of a recent cold spell to test CD’s views on nyctitropism [night movements] in plants. Describes Pandanus and Oxalis sepium.

Has just received CD’s letter of 4 July and he is glad that his observations on the effects of rain on plants interested CD.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  9 and 10 Aug 1881
Classmark:  Möller ed. 1915–21, 2: 416–17; Nature, 15 September 1881, p. 459
Letter no:  DCP-LETT-13284A

From Fritz Müller   6, 7, and 9 September 1881

Summary

Discusses some of his observations on the sleep movement in plants. Has been studying the leaflets of Crotalaria; has discovered they move to face the setting sun.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  6, 7 and 9 Sept 1881
Classmark:  DAR 171: 287
Letter no:  DCP-LETT-13318

From Fritz Müller   29 October 1881

Summary

Thanks CD for letter of 10 September [13326]

and for copy of Nature.

Reports on Lagerstroemia experiments.

Has been making observations on what happens to plants following heavy rain. Sends CD three specimens to show how dirt attaches to the undersides of leaves.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  29 Oct 1881
Classmark:  Möller ed. 1915–21, 2: 419–20
Letter no:  DCP-LETT-13441A
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Darwin, C. R.disabled_by_default
Müller, Fritzdisabled_by_default
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1881disabled_by_default
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