[119] Darwin's Descent of Man, p. 294, and footnote.
[120] Nature, 1871, p. 489.
[121] Darwin in Nature, 1880, p. 237.
[122] See the author's Contributions to Natural Selection, chap. vii. in which these facts were first brought forward.
[123] On this point see the author's Contributions to Natural Selection, chap. v. i.
[124] Seebohm's History of British Birds, vol. ii., introduction, p. xiii.
[125] For details see Darwin's Descent of Man, chap. xii.
[126] Descent of Man, pp. 417, 418, 420.
[127] Notes of a Naturalist on the Challenger.
[128] Descent of Man, pp. 401, 402.