Encloses Fritz Müller letter, which may be of interest [see 11463].

RM should take no more trouble over the subject [Otto Zacharias’ photos; see 11510].

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.

Is glad RM will draw up a paper from Fritz Müller’s letter.

Has received interesting essay from August Weismann on sexual selection in daphnoids [“Schmuckfarben der Daphnoiden”, Z. Wiss. Zool. (1878)].

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.

Does not think the Petunia is anything remarkable.

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

Will do his best to provide preface for Weismann’s Studien [see Collected papers 2: 280–1].

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

Will arrange to meet CD when he comes to London.

Invites RM to luncheon.

CD sends his preface [to RM’s translation of August Weismann, Studies in the theory of descent (1882); Collected papers 2: 280–1].

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.

Regrets he cannot compare his work with Weismann’s in his preface as he feels “an author is never a fit judge of his own work”. [Appended note explains that RM wished CD’s work to be fully acknowledged, which was frequently not the case in continental writings.]

Is making progress with the Weismann translation.

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

Is glad book progresses; answers translation query.

Francis Darwin does not have time to lecture.

Sends the Fritz Müller article from Kosmos.

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].

Wishes to subscribe to RM’s translation of Weismann.

Has seen Scudder’s article.

A. R. Wallace’s article ["Animals and their native countries", Nineteenth Century 5 (1879): 247–59] is excellent.

Sends specimens from F. Müller.

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