Returns historical sketch [of GHD’s "cousin paper"?] with comments. "For Heavens sake put a sentence in some conspicuous place that your results seem to indicate that consanguineous marriage, as far as insanity is concerned, cannot be injurious in any very high degree."

On voluntary vomiting. Dogs re-swallow vomited food.

Thanks for new edition of Descent.

His work on geographical distribution; drudgery and the often unsatisfactory nature of the result.