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Müller, Fritz in correspondent 
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From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
12 Jan 1878
Source of text:
The British Library (Loan MS 10 no 44)
Summary:

CD and son [Francis] working on spontaneous movements of plants and heliotropism.

Has given [Raphael Meldola] permission to read extracts of FM’s last letter [not found], on odours emitted by moths, before Entomological Society [Trans. R. Entomol. Soc. Lond. (1878): ii–iii].

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
20 Feb 1878
Source of text:
Oxford University Museum of Natural History (Hope Entomological Collections 1350: Hope/Westwood Archive, Darwin folder)
Summary:

Reports butterfly species that apparently mimic each other and gives details of some odoriferous species.

[Letter copied in Raphael Meldola’s hand from original sent to Meldola with 11449.]

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
27 Mar 1878
Source of text:
The British Library (Loan MS 10 no 45)
Summary:

Thanks FM for letter of 22 Feb [not found] on Lepidoptera. Will send it to Entomological Society to be read. FM’s earlier letters produced best discussions of the season.

Thanks for seeds of Viola.

He and Francis [Darwin] are at work on biology of seedling plants and wish to observe how the flowers penetrate the earth.

The Pontederia did not germinate, probably pressed too much [in post].

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
5 Apr 1878
Source of text:
Oxford University Museum of Natural History (Hope Entomological Collections 1350: Hope/Westwood Archive, Darwin folder)
Summary:

Observations on a sensitive Mimosa.

Comments on structure and positioning of "odoriferous organs" of moths and butterflies,

and feeding habits of butterfly larvae.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
16 May 1878
Source of text:
The British Library (Loan MS 10 no 46)
Summary:

Has forwarded FM’s letter to Raphael Meldola.

Thanks for information on Mimosa.

Would like to know how Cassia behaves in the rain.

Contributor:
Darwin Correspondence Project
From:
Johann Friedrich Theodor (Fritz) Müller
To:
Charles Robert Darwin
Date:
21 July 1878
Source of text:
Möller ed. 1915–21, 2: 382
Summary:

Is sending CD the seeds of a beautiful Cassia given to him by a friend. He sketched the unripe fruit a few months ago. This plant is rare in the area around Sta Catharina. He has found their largest and most beautiful butterfly Callidryas manippe near this tree and its caterpillars living on its leaves. Comments on how remarkable it is to find a species limited to living on a single tree in so large an area.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Johann Friedrich Theodor (Fritz) Müller
Date:
24 July 1878
Source of text:
The British Library (Loan MS 10 no 47)
Summary:

Thanks for seeds

and information about earthworms.

Is working hard at movement in plants.

Contributor:
Darwin Correspondence Project