“After twelve generations”: Darwin 2009, p. 160.

Jenkin was a multitalented individual: Brownlie and Lloyd Prichard 1963.

Fleeming Jenkin published his criticism: Jenkin 1867. The article is reproduced in Hull 1973, p. 303, and can also be found online at www.victorianweb.org/science/science_texts/jenkins.html.

Jenkin’s approach was quantitative: Excellent discussions of Jenkin’s arguments can be found in Bulmer 2004, Vorzimmer 1963, and Hull 1973.

only Arthur Sladen Davis: Davis 1871.