[38] "Descent of Man," p. 165.

[39] "Descent of Man," p. 158.

[40] "Descent of Man," p. 155.

[41] Ibid.

[42] "Descent of Man," pp. 156, 157.

[43] Ibid., p. 156.

[44] "Descent of Man," p. 156.

[45] "Descent of Man," p. 6.

[46] Ibid., p. 8.

[47] Ibid.