Has reread copy of Fritz Müller’s letter that CD sent some time ago and would like to publish the entomological observations in it.

Encloses Fritz Müller’s letter.

Is exhibiting butterflies in which variations in the female show a finely graded series. Believes dimorphism can be explained by the selection of the extremes of such a series and the consequent extinction of the intermediates.

Would like to see the Kosmos article.

Is considering producing a translation of August Weismann’s essays.

Comments on Wallace’s paper on the colours of animals and plants [Macmillan’s Magazine 36 (1877): 384–408, 464–71].

Wishes to borrow third part of Fritz Müller’s article on sexual selection in butterflies [Kosmos 2 (1877–8): 218–24].

Is forwarding material on stridulation, including Prof. Wood-Mason’s paper ["Note on Mygale stridulans", Trans. R. Entomol. Soc. Lond. (1877): 281–2], which should interest CD.

Returns Kosmos.

Thanks CD for permission to use Fritz Müller’s last letter, which contains new observations.

Encloses proof of the Entomological Society’s Proceedings for February to show the use he has made of Fritz Müller’s letter [see 11319].

Will exhibit the photos at the Entomological Society and have them identified.

Fritz Müller’s observations on relative abundance of mimicking and mimicked species.

Prof. Wood-Mason has examined Otto Zacharias’ insect photographs and confirmed the genera.

RM is going to work up Fritz Müller’s observations into a paper.

Would like to read Weismann’s essay on Daphnidae.

Fritz Müller’s paper on odours emitted by butterflies was read at last Entomological Society meeting.

Plans to produce a translation of Weismann’s Studien zur Descendenz-Theorie [1875–6] and would welcome a preface from CD.

Thanks for agreeing to write the preface for RM’s translation of Weismann.

Will arrange to meet CD when he comes to London.

Thanks for preface. When RM’s translation is complete, would like CD to expand it slightly to refer to overlap between Weismann’s observations and CD’s theories.

Is making progress with the Weismann translation.

Wonders whether Francis Darwin would give a botanical lecture at a Bayswater school.

Has arranged for publication of his translation of Weismann.

S. H. Scudder article on sexual dimorphism in butterflies [Proc. Am. Acad. Arts & Sci. 12 (1877): 150–8].

Sends specimens from F. Müller.

Criticises A. R. Wallace’s review of Grant Allen’s The colour-sense [Nature 19 (1879): 501–5].

Comments on the branchiate trichopteran specimen from Fritz Müller sent previously.

Wants to republish Fritz Müller’s paper ["Ituna and Thyridia", Kosmos 5 (1879): 100–8] in Proceedings of the Entomological Society. [Thyridita!?]

Discusses Fritz Müller’s paper on the mutual protection of certain mimics ["Ituna and Thyridita", Trans. R. Entomol. Soc. Lond. (1879): xx–xxviii]. [Thyridia!?]

Sends subscription form for English edition of Weismann’s Studien.

Discusses the origin and advantages of sexual differentiation in terms of division of labour.

Discusses the origin of the giraffe’s neck and the unsoundness of St G. J. Mivart’s view with respect to it.

Points out an error in Descent.