[104] North British Review, New Series, vol. vii., March 1867, p. 282.

[105] "Habit and Intelligence," vol. i. p. 75.

[106] "Habit and Intelligence," vol. i. p. 202.

[107] "Comparative Physiology," p. 214, note.

[108] See Nature, June and July 1870, Nos. 35, 36, and 37, pp. 170, 193, and 219.

[109] "Natural Selection," p. 293.

[110] "Animals and Plants under Domestication," vol. i. pp. 289-295.

[111] "Origin of Species," 5th edition, 1869, p. 45.

[112] Ibid. p. 13.

[113] "Animals and Plants under Domestication," vol. i. p. 115.