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From Fritz Müller   17 July 1867

Summary

Thanks CD for sending F. H. G. Hildebrand’s book on fertilisation [Die Geschlechter-Vertheilung bei den Pflanzen (1867)]

and J. D. Hooker’s "Lecture on insular floras".

Describes work on Rubiaceae, Oxalis,

and on crossing orchids. Lists crosses made.

As for CD’s query concerning sexual differences among invertebrates, he gives the case of the local amphipod, Brachyscellus diversilor. Male differs in shape of antennae and coloration.

Also mentions local fish in sea near Sta Catharina which emits melodic tone to attract females.

Author:  Johann Friedrich Theodor (Fritz) Müller
Addressee:  Charles Robert Darwin
Date:  17 July 1867
Classmark:  Möller ed. 1915–21, 2: 130–1
Letter no:  DCP-LETT-5583A

To Fritz Müller   31 July [1867]

Summary

Has abstracted for insertion in his sterility chapter [Variation 2, ch. 18], FM’s observations of plant’s pollen being poisonous to itself.

Occurrence of mimetic plants.

Colouring of Planariae.

Author:  Charles Robert Darwin
Addressee:  Johann Friedrich Theodor (Fritz) Müller
Date:  31 July [1867]
Classmark:  The British Library (Loan MS 10 no 17)
Letter no:  DCP-LETT-5591
Document type
letter (2)
Addressee
Correspondent
Darwin, C. R. (2)
Müller, Fritz[X]
Date
1867
07
17 (1)
31 (1)
letter