Thanks HWB for his book [Naturalist on the river Amazons]. Feels sure it will often be alluded to in other works.

Asa Gray is fascinated by the "Butterfly paper" ["Contributions to an insect fauna of the Amazon valley", Trans. Linn. Soc. Lond. 23 (1862): 495–566].

Has finished vol. 1 [of Naturalist on the river Amazons]. CD praises book as "best ever published in England".

The review in the Athenæum was cold, as always, and insolent.

Expresses hope that CD is ready to pronounce sentence on his book;

he relates his financial position and mentions that he hopes to get a position at the British Museum.

After finishing vol. 2 [of Naturalist on the river Amazons], CD still has only praise. Remarks that his family is also enjoying the book. He regrets having finished, since he so enjoyed the descriptions.

His satisfaction at CD’s acceptance of book as well as total public acceptance. Murray has given him a £250 advance. His pleasure at Asa Gray’s words.

Next task will be to write on origin [of species] by segregation of local races.

HWB’s concern over CD’s poor health.

Gives accounts of reviews of his book in the Times and in the Revue des Deux-Mondes by E.-D. Forgues ["Un naturaliste sous l’équateur", Rev. Deux-Mondes 46 (1863): 703–37].

Thanks CD for the A. Gray review of his paper [see 4022].

Reports his current work is a monograph on Mantidae.

Returns Gray’s review [of paper on mimetic analogy, Am. J. Sci. 2d ser. 36 (1863): 285–90]

and expresses his sorrow over CD’s health.

Pleased at receiving CD’s letter.

HWB informs him of favourable notice of the mimetic paper [in Wiegmann’s Arch. Naturgesch. 29 (1863) pt 2: 315–19].

He is pleased with his post [Asst. Sec. of Royal Geographical Society].

Expresses pleasure at signs of CD’s recovery.

HWB’s work on the identification of species of the genus Colobthea; relates the large number of modifications that occur in the sexual organs of closely allied species. Does not doubt that this contributes greatly to multiplication of species in nature.

He encloses a portrait and asks for one of CD.

He has sent mimetic paper to B. D. Walsh.

Mentions work at Royal Geographical Society on N. Pole business [plans for an Arctic expedition, eventually postponed until 1875–6].

Asks for a letter on the tameness of deer, written by Commander A. Boutakoff to R. I. Murchison and printed in the Journal [J. R. Geogr. Soc. 23 (1853): 93–101].

HWB sends a copy [missing] of Boutakoff’s letter, explaining that the deer were saiga antelopes and the islands were new discoveries.

Sexual ornamentation of insects: coloration of Epicalia genus [of tropical S. American butterflies];

horned genera of lamellicorn beetles [see Descent 1: 370, 388].

Wallace brought CD’s question about gay-coloured caterpillars before the Entomological Society. Members now seeking explanations.

Working on sexual differences in collection of horned beetles and will send CD results.

Answers CD’s questions [sent on behalf of Miss Tollet of Betley Hall, Staffs.] on mimicry – how it helps prevent extinction, the modifications occurring with a change of habitat until mimicry occurred.

Also gives some cases of sexual differences.

Would like tabulation of horned beetles if not too troublesome, but would easily settle for general remarks.

On the subject of other species mocking Heliconidae, asks whether full-coloured ones were mocked. Expresses full belief in HWB’s theory.

Encloses a copy of A. R. Wallace’s letter to the Field requesting observations on which caterpillars birds devour.

Asks about proportions of male to female insects.

Has put question of proportion of sexes in insects to the Entomological Society. Quotes H. T. Stainton and F. Smith. Cites some cases mentioned by other members.

Is reading Variation; does not quite understand Pangenesis.

CD in utter confusion about differences between J. O. Westwood and HWB on division of certain insects. Asks if HWB will homologise certain families for him, telling him which terms would be most generally understood.

Asks also about differences on sound-producing organs of Achetidae Gryllidae.

Comments on J. O. Westwood’s entomological nomenclature.

Discusses the organs for stridulation in Orthoptera [see Descent 1: 352ff].

Thanks HWB for bringing "the question of sexes" before the Entomological Society. Feels he will come to some conclusion by comparison of numerous observations.

It appears Pangenesis "will expire unblessed and uncursed by the world".