Thanks CD for a recent letter.

Reports on his health, which has been bad for 12 months.

Sends extracts of works on domestication.

Discusses the pairing of various birds; comments on the pugnacity of partridges, pheasants, male guinea-fowl, and peacocks.

Gives proportions of sexes in pheasants.

Sexual differences in coloration. Sexual selection versus natural selection as explanations. ARW continues to argue against sexual selection, saying that natural selection, in keeping the female dull for protection, would account for differences in sexual colouring more effectively than inheritance and partial transmission of sexually selected male colours. Colours of female birds of paradise. Protective coloration. Disagrees with CD on coincidence of hidden nests and bright colours of females.

Encloses further replies from Australia to CD’s queries on expression. Wilson’s letter to CD enclosed the letter from Smyth with its enclosures (see S6314).

Both sexes of Crossoptilon auritum (eared pheasant) obtained the red cheeks the first year.

Coloration of the linnet.

Observations on lateral spots on coats of two specimens of deer. PS on habits of wild and domestic turkeys.

Thanks CD for letter of 3 Oct [missing] about LB’s publication.

C[harles?] P[arker?] says he has made a "fearful mistake", and the marriage cannot be; EAD hopes to come to CD next week.

Beginning of extract from William Dell Hartman’s "Journal of the doings of Cic[ada?] septemdecim" [unidentified] in Pennsylvania in 1851.

Has been working with G. R. Crotch on stridulation. The sexual theory seems very shaky.

Is sending preparations of beetles.

J. J. Sylvester reports George’s fellowship "the most enviable position on earth".

Charles [Parker?] "appears to be ruined".

Feels there is little he could say as a testimonial for HMJ.

Gives CD a reference to one of his papers ["Remarks on the modes of variation of nearly affined species or races of birds", J. Asiat. Soc. Bengal 19 (1850): 221–9]

and discusses moulting in birds.

Quotes instance of an action by an elephant that apparently displays considerable intelligence.

Bibliographical references on [stridulation in] Coleoptera. Finds no idea of sex has occurred to authors [i.e., they do not find the stridulating organs differing according to sex; cf. Descent 1: 378–85].

Replies to CD’s questions on sexual differences in birds.

Encloses copy of H. Barkly’s answer to JDH’s inquiry on the Seychelles Island crocodile.

A sermon.

Asks JT to distribute some circulars about the work of Gustavus Hinrichs of Iowa, whom CD wishes to help.

Admires JT’s Norwich address [to Mathematics and Physics Section, BAAS meeting, Rep. BAAS 38: 1–6] and his Fortnightly Review paper on scientific discovery [7 (1867): 645–60].

Gustavus Hinrichs is also a [not highly regarded] correspondent of JT’s; he will put GH’s papers on the table at Royal Institution to ease CD’s conscience.

Dined with the Asa Grays at Hooker’s. Told Mrs Gray that CD’s ill health was a benefit because it caused him to ponder a great deal.

Pleased HM says good words for Pangenesis.

Congratulates CD on election of his son [George] as a Fellow of Trinity College.

Describes his ill health.

Invites CD to visit Cambridge.

[Letter dated November in error.]