Raises two points on CD’s view, in Descent [2: 229], on how aquatic birds acquire white plumage.

Also remarks on effect of will in certain human modifications,

on colour-blindness in his children,

and on ability to move his ears.

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.