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.]

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

Discusses mimetic insects.

Thanks for his election to the Austrian Imperial Academy.

Is sorry ES has suffered in health.