Thanks for letter and "valuable" extracts.

If S. American Carabi differ more from other species than do those from other distant locations (e.g., Siberia, Europe, etc.), CD agrees that difference would be too great to have occurred in the recent glacial age; CD also rejects independent origin. Plants seem to migrate more readily than animals. HWB should not underrate length of glacial period; CD also believes they will be driven to an older glacial period.

Sorry about news of British Museum – hopeless to contend against anyone supported by Owen.

CD dearly wishes HWB could find a situation in which he could give time to science.

Referring to conversation with Lyell, CD is certain that there was a Miocene glacial period.

Compliments HWB on the mimetic display at the British Museum. Those at the Museum readily accepted HWB’s "doctrine".

Was shown genital organs of closely allied Chrysomelidae.

Albert Günther is candidate for position at Museum.

Encloses a question [missing] concerning language [from Hensleigh Wedgwood].

Asks for news of HWB and his book.

There has been sickness in CD’s family; one of the boys [and Emma] had scarlet fever.

Has had a letter from Edwin Brown of Burton who is working on classification of Carabi.

Thanks for last note. Assures HWB that all writers have problems similar to his.

Plans to inquire at Linnean Society for HWB’s paper.

His family, including Mrs Darwin and Leonard, are now well.

Just finished HWB’s paper ["Contributions to an insect fauna of the Amazon valley", Trans. Linn. Soc. Lond. 23 (1862): 495–566], one of the most remarkable he has ever read. Found mimetic cases and connection of facts marvellous. Finds equally important the facts on variation and segregation of complete and semi-complete species. Questions whether insect mimicry is not due to small size and defencelessness. Criticises title of paper. Mentions that Wallace will appreciate it.

[Apparently in reply to question in missing portion of 3825.] A written agreement is unnecessary, but a letter stating terms would prevent misundertanding. He will attempt to have a review of HWB’s paper published.

Thanks for paper and references on variations [missing].

Regrets HWB’s trouble about artists, etc., saying such trouble is a law of nature.

Asks whether HWB has heard of starving Indians who are forced to cook in different ways, and eat new things.

Asa Gray will try to get HWB’s paper reviewed.

Also mentions that he (CD) wrote a short review of it for Natural History Review [Collected papers 2: 87–92].

Asks whether bees or Lepidoptera visit flowers of Melastomataceae.

Congratulations on marriage, which CD considers the best and only chance for happiness in this world.

Glad HWB is near completion of book.

Begs him to thank Wallace for Melastoma information; CD "cannot endure being beaten by a beggarly flower".

CD relates Asa Gray’s pleasure over HWB’s paper and Gray’s plans to write abstract [Am. J. Sci. 2d ser. 36 (1863): 285–90].

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.

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.

Asks for information he needs for the German translation [of Coral reefs], including correct titles of reference books and the name of a voyager.

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].

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.

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.

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".