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Darwin, C. R. in correspondent 
Müller, Fritz in correspondent 
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From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
16 Feb 1870
Source of text:
Linnean Society of London
Summary:

Sends specimens of Passiflora and seeds for T. H. Farrer [letter enclosed with 7188].

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
29 Mar 1870
Source of text:
DAR 76: B36
Summary:

His observations on mimicry in butterflies

and self-sterility in plants.

Contributor:
Darwin Correspondence Project
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From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
12 May 1870
Source of text:
The British Library (Loan MS 10 no 32)
Summary:

Crossing experiments and self-sterility [in Eschscholzia].

Pangenesis.

Hermann Müller on insect adaptations for fertilisation of flowers.

CD working on book on man and sexual selection.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
28 Aug 1870
Source of text:
The British Library (Loan MS 10 no 33)
Summary:

Mimicry in Lepidoptera.

Sexual selection.

The Franco-Prussian war.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
14 June 1871
Source of text:
DAR 89: 91–3; DAR 142: 58
Summary:

Discussion of mimicry and sexual selection among butterflies, occasioned by reading Descent.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
2 Aug [1871]
Source of text:
The British Library (Loan MS 10 no 34)
Summary:

Opinions on Descent.

Sexual selection and mimicry in Lepidoptera; sexual selection as an aid to protective imitation.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
16 Jan 1872
Source of text:
DAR 142: 55
Summary:

Has no objection to CD’s alluding to FM’s idea that sexual selection has come into play in mimetic butterflies.

Reports observations on other butterflies and on termites.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
25 Sept 1873
Source of text:
The British Library (Loan MS 10 no 35)
Summary:

Seedling vigour resulting from crossing of parents.

CD to publish work on insectivorous plants.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
[c. Jan 1874]
Source of text:
Nature , 19 February 1874, p. 309
Summary:

Agrees with Bates that neuter termites are not modified imagos (sterile females), but modified larvae (of both sexes).

Systematic relations of stingless honey-bees (Melipona and Trigona) are not yet well established.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
1 Jan 1874
Source of text:
The British Library (Loan MS 10 no 36)
Summary:

Thanks for two pamphlets.

Sends Thomas Belt’s [The naturalist in Nicaragua (1874)], "the best Nat. Hist. book of travels ever published".

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
13 Feb 1874
Source of text:
The British Library (Loan MS 10 no 37)
Summary:

Has sent FM’s letter on termites to Nature ["Habits of various insects", Nature 10 (1874): 102–3].

Would be interested in observations on the stingless bees of Brazil.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
20 Apr [1874]
Source of text:
Nature , 11 June 1874, pp. 102–3
Summary:

FM gives his own observations of leaf-cutting ants, which support those of Thomas Belt in his book [The naturalist in Nicaragua (1873)]. [See 9223.] These ants feed only upon the fungus that grows upon the leaves that they carry to their nests.

He has caught a moth of the Glaucopidæ that when touched emitted a cloud of snow-white wool.

Observations on the stingless bees of Brazil.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
12 Sept 1875
Source of text:
Möller ed. 1915–21, 2: 318; Royal Botanic Gardens, Kew (PrP 08-0011)
Summary:

Has read CD’s book on Drosera [Insectivorous plants] and found that it presents new material and is very interesting.

Has discovered that the parasites he thought he had found in Melipona nests are in fact true females. It is remarkable that they differ so greatly from the sterile females and males of their species.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
25 Dec 1875
Source of text:
Nature , 17 February 1876, pp. 304–5
Summary:

"Sambaquis", or shell mounds accumulated by former inhabitants of the coast, contain shells of some animals that FM has never seen living.

Ants that live on imbauba trees (Cecropia) are attracted by small bodies at base of each petiole.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
[9 Feb 1876]
Source of text:
The British Library (Loan MS 10 no 38) (EH 88205868)
Summary:

Has sent FM’s letter on to Nature ["Brazil kitchen middens, habits of ants, etc.", Nature 13 (1876): 304–5].

Would be grateful for Ceropegia seeds.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
[18 Feb 1876]
Source of text:
The British Library (Loan MS 10 no 39) (EH 88205869)
Summary:

Has received seeds of Cecropia peltata from Kew.

Has asked Hermann Müller to send copy of FM’s paper as soon as published.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
11 Dec 1876
Source of text:
The British Library (Loan MS 10 no 40) (EH 88205870)
Summary:

FM’s new position in Rio.

CD interested in nature of surface deposits at Rio.

Sends a copy of Cross and self-fertilisation.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
25 Mar 1877
Source of text:
DAR 111: A89–90
Summary:

Thanks CD for new [2d] edition of Orchids.

Mentions some observations on dimorphic plants.

Reports on a third species of Pontederia [see Forms of flowers, p. 185].

Describes some unusual grasses.

Reports rumours from southern Brazil concerning the existence of a gigantic subterranean animal.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
9 May 1877
Source of text:
The British Library (Loan MS 10 no 41)
Summary:

Is printing a book on dimorphic plants [Forms of flowers] in which he will make considerable use of FM’s work.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
14 May 1877
Source of text:
The British Library (Loan MS 10 no 42)
Summary:

Requests observations on sensitive Mimosa and movements of plants in rain.

Worm-castings.

Contributor:
Darwin Correspondence Project