[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.