Note 46 — Chapter II
Reading edition
On this subject, see Francis Galton. "Natural Inheritance", 1889, p. 132ff. See also G. B. L. Arner, "Consanguineous Marriages", 1908, p. 65ff.; C. B. Davenport, "Heredity in Relation to Eugenics", 1911, p. 124ff.