CHAPTER I: THE OBSERVER
[1] Journal des Goncourts, May 1, 1857, vol. I, p. 182.
[2] Ben Jonson, The Poetaster, act II, scene 1.
[3] Sentimental Journey, ‘In the Street.’
[4] Portraits Littéraires, vol. III, p. 546.
[5] Expression, p. 80.
[6] Thoreau, Journal, vol. VII, p. 46.
[7] Gray, to Darwin, May 18, 1862, Gray, Letters, vol. II, p. 481.
[8] Great Naturalists, p. 51.
[9] More Letters, vol. I, p. 72.
[10] Life, vol. I, p. 83.
[11] To Farrar, November 26, 1868, Life, vol. II, p. 453.
[12] To Hooker, 1867, More Letters, vol. II, p. 6.
[13] To Lyell, June 1, 1867, Life, vol. II, p. 248.
[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.
[24] To Hooker, December 11, 1860, Life, vol. II, p. 148.
[25] To Scott, July 2, 1863, More Letters, vol. II, p. 323.
[26] To Horner, January, 1847, More Letters, vol. II, p. 224.
[27] Expression, p. 12.
[28] Life, vol. II, p. 238.
[29] More Letters, vol. II, p. 105.
[30] Life, vol. I, p. 40.
[31] Different Forms of Flowers, p. 189.
[32] To Wiesner, October 4, 1881, More Letters, vol. II, p. 432.
[33] Life, vol. I, p. 124.
[34] Ibid.
[35] Life, vol. I, p. 125.
[36] Life, vol. II, p. 453.
[37] Cirripedia, p. 155.
[38] To Lyell, September 12, 1860, Life, vol. II, p. 133.
[39] Darwiniana, p. 275.
[40] To Hooker, February 4, 1861, Life, vol. II, p. 153.
[41] To Lyell, March 9, 1850, More Letters, vol. II, p. 229.
[42] Life, vol. I, p. 125.
[43] Life, vol. I, p. 105.
[44] Life, vol. I, p. 80.
[45] Life, vol. I, p. 121.
[46] Purgatorio, canto III.
[47] To Miss S. Darwin, August 4, 1836, Life, vol. I, p. 237.
[48] To Hooker, 1847, Life, vol. I, p. 317.
[49] More Letters, vol. I, p. 3.
[50] To Miss C. Darwin, November 8, 1834, Life, vol. I, p. 230.
[51] Beagle Journal, p. 78.
[52] Life, vol. I, p. 109.
[53] Expression, p. 194.
[54] To Romanes, May 29, 1876, More Letters, vol. I, p. 364.
[55] To Fox, May, 1832, Life, vol. I, p. 206.
[56] To Henslow, May 18, 1832, Life, vol. I, p. 208.
[57] To Henslow, August 15, 1832, More Letters, vol. I, p. 9.
[58] Journal, August 29, 1858, vol. XI, p. 137.
[59] Journal, December 4, 1856, vol. IX, p. 158.
[60] Life, vol. I, p. 368.
[61] Worms, p. 97.
[62] Origin, p. 105.
[63] In Popular Science Monthly, April, 1909, vol. LXXIV, p. 198.