[333] Vol. ii. chap. i.
[334] Vol. ii. chap, xxxiv., ed. 1872.
[335] 'Philosophie Zoologique,' ed. M. Martins, Paris, Lyons, 1873, tom. i. p. 24.
[336] 'Philosophie Zoologique,' tom. i. p. 72.
[337] 'Origin of Species,' p. 3.
[338] Ibid. p. 5.
[339] 'Origin of Species,' p. 8.
[340] Ibid. p. 9.
[341] Ibid. p. 158.
[342] Ibid. p. 159.