CD’s son Horace wishes to continue at Easton and Anderson’s Works. CD trusts they will not bind him to long hours of work as this would be against medical advice.

Returns FDeC’s certificate for the Royal Society signed.

Thanks for the acid digestion experiments, which can be printed as they are. CD trying Drosera on dentine and enamel.

Thanks Nature correspondents for their observations on destruction of primroses [Nature 9 (1874): 509; 10 (1874): 6–7]. Reports an error in his observations: ovules, as well as nectar, are taken by the birds. As the habit of cutting off primrose flowers is widespread, CD concludes it is instinctive in bullfinches.

Would be interesting to discuss political economy in light of evolution. Recommends Walter Bagehot Physics and politics [1872] and Descent in which source of moral sense is discussed.

Regrets he cannot comply with request because of his work and poor health.

Delighted to have seen correspondent’s "wonderful experiment" at Royal Society.

CD is rather disappointed by the money raised for Dohrn. Had hoped for £700–800.

Recommends that JM consider publishing a new edition of J. F. McLennan’s Primitive marriage [1865]. CD considers it very valuable and not too indelicate.

Interested in TMR’s investigation of drift. Narrative 1: 545–6 contains catalogue of shells collected. Much struck by marine productions of Tierra del Fuego.

Encloses, for examination, residue from skim-milk which has been on the glands of Drosera. Asks TLB to confirm his views on action of Drosera secretion on milk. Asks about effects of pepsin and hydrochloric acid in digestive juice.

Has just finished new editions of Descent

and Coral reefs.

Is working on a book almost wholly on Drosera; thinks he has made some discoveries.

Will never have strength and life to complete more of the series of books related to Origin.

Encloses notes concerning his life and list of publications.

Returns the letters about primroses: they contain little that is new. Dr Bree’s is the best.

Discusses digestion by insectivorous plants, asks JSBS to try same experiments using pepsin as the digestive agent to see how the results compare with CD’s observations on digestive power of Drosera.

Requests sewage water (and oleic acid) for experiments to determine sensitivity of leaves [of Drosera].

Thanks him for copy of book [Der Kampf um’s Dasein am Himmel (1874)].

Thanks for the sewage water and the oleic acid. The former does not seem to act.

Descent [2d English ed.] will not be published until November. Will send JVC first sheet of revised proofs soon.

Pleased to hear of success of JVC’s lectures.

Summer plans have changed. Does not yet know when he will take a month’s holiday.

"With kind regards, & many thanks for Prof. Steenstrup’s Photograph, which is most highly valued by C. Darwin"

CD responds to information about residue of milk digested by Drosera. Is obliged for information on strength of acids and albumen and now has little doubt acid had impaired the leaves. Awaits word on pepsin and papaw juice.

Thanks for note and paper ["Secondary sexual characters in Cheiroptera", Proc. Zool. Soc. Lond. (1873): 241–52].

Has corrected error in new edition of Descent [1874].

Sees nothing strange in geckos inhabiting frost-clad land and having no claws.