[14] To Wilson, April 29, 1878, More Letters, vol. II, p. 421.

[15] To Galton, November, 1879, Life, vol. II, p. 414.

[16] To Lyell, March 17, 1863, Life, vol. II, p. 201.

[17] To Galton, November 8, 1872, More Letters, vol. II, p. 108.

[18] Expression, p. 184.

[19] To Dr. Ogle, March 12, 1871, Life, vol. II, p. 321.

[20] More Letters, vol. I, p. 4.

[21] To Jenyns, October 17, 1846, Life, vol. I, p. 396.

[22] Beagle Journal, p. 282.

[23] To Gray, June 3, 1874, Life, vol. II, p. 457.