Comments on discussion of residual organs in Descent [ch. 1].

Describes his ability to contract the platysma myoides at will.

Suggests reason for loss of voluntary movement of ears in men and monkeys.

Discusses loss of voluntary movement of ears in man and monkey.

Reply to CD’s letter of 5 Apr 1871 [7659], in which he asked HA for further details on when and how platysma myoides contracts.

Replies to CD’s questions about sources on leaf arrangement.

Gives news of speech and paper about CD.

Discusses movement of ears and contraction of the platysma.

Discusses phyllotaxy, citing work of Carl Nägeli and Chauncey Wright.

Thanks for letter and reference to Nägeli’s observations on leaf arrangement in the bud.