Note 63 — LOVE AND COURTSHIP AMONG BIRDS.

[Note 63] p. 272.—Sexual Selection.

For a statement of the doctrine of sexual selection, the original document—Darwin’s Descent of Man—should be consulted. But the theory has met with strong criticism, e.g. on the part of Alfred Russel Wallace, see his Darwinism. See also The Evolution of Sex, by Geddes and Thomson, and Lloyd Morgan’s Animal Life and Intelligence.