Instances of sexual differences in viviparous fishes, suggested by reading chapters on sexual selection [in Descent] and by Mivart’s Genesis of species.

Notes on echinoderms.

Believes his letter of 17 Apr bears also on vol. 1 of Descent.

Ability to move ears is common in his family.

Similarity of foot of man to that of gorilla continues beyond foetal stage.

Invites CD to stay overnight if visiting the area.

Discusses homologies in various animal groups.

Comments on Mivart [Genesis of species].

Instance of a dog able to discriminate a note played out of tune. [See Descent, 2d ed., p. 569.]

No summary available.

Comments on CVR’s book [Third annual report on the noxious, beneficial, and other insects of the State of Missouri (1871)].

Discusses mimetic insects.

Further observations on expression of her dog.

Facts contradicting Wallace’s views on coloration of Lepidoptera.

Observations on habits of caribou and deer in Newfoundland.

Suggests nightingale egg coloration evolved from white to olive for protection.

Sends answers to CD’s queries on expression.

Follows up CD’s observation of 13 May 1871, of a New Forest pony shedding its winter coat.

On Down parish matters.

Thanks for FD’s help. CD cannot conceive what Mivart means by "the identity between eyes of Cephalopods and Vertebrata".

Has invited Michael Foster to Down.

Various observations from his experience in Africa relevant to Descent.

Fertility of hybrids of blacks and whites.

Protective coloration of Sahara animals.

Natives’ ideas of female beauty.

Discusses the origin and advantages of sexual differentiation in terms of division of labour.

Discusses the origin of the giraffe’s neck and the unsoundness of St G. J. Mivart’s view with respect to it.

Points out an error in Descent.

Will call tomorrow.

Argues that coloration of eggs is a protective adaptation.

Michele Lessona will translate Descent into Italian [1871].

Sends his review from Nuova Antologia [17 (1871): 177–94].

In a letter to Archivio per l’Anthropologia he raises some doubts about sexual selection and proposes "Neogenesis" as a complement to natural selection in cases of rapid change.

As a professor of natural history, LD has spread CD’s doctrines in Hungary. Now wishes permission to translate Descent.

A geologist friend leaving for Nevada offers to investigate any questions CD may have for this region.

Nesting plumage of common chaffinch resembles adult winter plumage of female brambling.