[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.

[64] To Bates, November 22, 1860, More Letters, vol. I, p. 176.

[65] To Fawcett, September 18, 1861, More Letters, vol. I, p. 195.

[66] More Letters, vol. I, p. 93.

[67] Life, vol. I, p. 40.

[68] Answer to questionnaire, Life, vol. II, p. 355.

[69] Life of Huxley, vol. I, p. 521.

[70] To Wallace, August 28, 1872, Life, vol. II, p. 346.

[71] To Balfour, September 4, 1880, More Letters, vol. II, p. 424.

[72] Beagle Journal, p. 378.

[73] To Wallace, December 22, 1857, Life, vol. I, p. 465.

[74] Journal, March 23, 1853, vol. V, p. 45.

[75] Gray to Canby, July 14, 1874, Gray, Letters, vol. II, p. 649.

[76] Gray to Darwin, July 21, 1863, Gray, Letters, vol. II, p. 509.

[77] Life, vol. I, p. 79.

[78] To Fox, March 24, 1859, Life, vol. I, p. 506.

[79] Life, vol. I, p. 83.

[80] To Hooker, February, 1846, More Letters, vol. I, p. 56.

[81] To Wallace, February 26, 1867, Life, vol. II, p. 276.

[82] Grammar of Science, p. 38.

[83] To Huxley, December 2, 1860, Life, vol. II, p. 147.

[84] To Hooker, November 15, 1855, More Letters, vol. I, p. 84.

[85] To Gray, November 29, 1859, More Letters, vol. I, p. 126.

[86] Beagle Journal, p. 443.

[87] Life, vol. I, p. 83.

[88] Thiselton Dyer, in Life, vol. II, p. 431.

[89] To Gray, 1857, More Letters, vol. II, p. 252.

[90] To Hooker, January 11, 1844, More Letters, vol. I, p. 39.

[91] To Wallace, May 1, 1857, Life, vol. I, p. 454.

[92] To Carpenter, November 19, 1859, Life, vol. II, p. 19.

[93] To Huxley, May 27, 1865, Life, vol. II, p. 228.

[94] Aristotle, Historia Animalium, Book I, chapter VI.

[95] Life, vol. I, p. 126.

[96] To Hooker, April 14, 1855, Life, vol. I, p. 415.

[97] To Hooker, March 26, 1863, More Letters, vol. I, p. 474.

[98] Genetics and Eugenics, p. 181.

[99] De Vries, Species and Varieties, p. 769.

[100] Different Forms of Flowers, p. 156.

[101] To Gray, April 3, 1860, Life, vol. II, p. 90.

[102] Zur Naturwissenschaft, Einzelne Betrachtungen und Aphorismen, section III.

[103] Life, vol. I, p. 121.

[104] To Wiesner, October 25, 1881, Life, vol. II, p. 510.

[105] Life, vol. I, p. 122.

[106] Orchids, p. 208.

[107] To Huxley, November 27, 1859, Life, vol. II, p. 75.

[108] Insectivorous Plants, p. 154.

[109] To Gray, June 8, 1860, More Letters, vol. I, p. 153.

[110] Huxley to Romanes, May 9, 1882, Life of Huxley, vol. II, p. 42.

[111] Huxley to Foster, February 14, 1888, Life of Huxley, vol. II, p. 203.

[112] Huxley to Hooker, March 9, 1888, Life of Huxley, vol. II, p. 204.

[113] Darwiniana, p. 287.

[114] Alexander Agassiz to Gibbs, December 15, 1897, in G. R. Agassiz, Letters and Recollections of Alexander Agassiz, p. 333.

[115] J. J. Stevenson, in Popular Science Monthly, April, 1909, vol. LXXIV, p. 353.

[116] October 2, 1879, Life, vol. II, p. 360.

[117] May 5, 1881, More Letters, vol. II, p. 198.

[118] Descent, p. 606.

[119] September 23, 1868, More Letters, vol. II, p. 85.

[120] August 19, 1868, More Letters, vol. II, p. 84.

[121] To Wallace, April 30, 1868, More Letters, vol. II, p. 77.

[122] To Huxley, June 12, 1867, More Letters, vol. I, p. 281.

[123] Animals and Plants, vol. II, p. 396.

[124] Animals and Plants, vol. II, p. 399.

[125] Life, vol. I, p. 75.

[126] August Weisman, The Evolution Theory (translation Thomson), vol. I, p. 242.

[127] Darwiniana, p. 20.

[128] To Hooker, January 20, 1859, Life, vol. I, p. 499.

[129] Life, vol. I, p. 77.

[130] Vallery-Radot, Pasteur, p. 139.

[131] Life, vol. I, p. 71.

[132] To Lyell, September 20, 1859, Life, vol. I, p. 521.

[133] Life, vol. I, p. 130.

[134] Life, vol. I, p. 117.

[135] July 2, 1860, Life, vol. II, p. 116.

[136] To Lyell, August 1, 1845, Life, vol. I, p. 308.

[137] To Hooker, September 25, 1853, Life, vol. I, p. 400.

[138] Origin, p. 404.

[139] To Hooker, October, 1856, Life, vol. I, p. 443.

[140] To Henslow, Life, vol. I, p. 245.

[141] To Huxley, July 3, 1860, Life, vol. II, p. 117.

[142] Life, vol. I, p. 72.

[143] To Lyell, October 1, 1861, More Letters, vol. II, p. 191.

[144] Zur Naturwissenschaft, Einzelne Betrachtungen und Aphorismen, section III.

[145] To Hooker, December 10, 1866, Life, vol. II, p. 239.

[146] To Hooker, May 2, 1857, Life, vol. I, p. 454.

[147] Darwiniana, p. 246.

[148] To De Candolle, January 14, 1863, More Letters, vol. I, p. 234.

[149] To Hooker, April 1, 1864, More Letters, vol. II, p. 330.

[150] To Hooker, April, 1857, Life, vol. I, p. 450.

[151] To Hooker, March 7, 1855, Life, vol. I, p. 405.

[152] To Hooker, July 30, 1856, Life, vol. I, p. 439.

[153] To Huxley, January 10, 1863, More Letters, vol. I, p. 231.

[154] Historia Animalium, book VIII, chapter XXVIII.

[155] Historia Animalium, book VIII, chapter XXIX.

[156] Beagle Journal, p. 216.

[157] To Hooker, January 11, 1844, Life, vol. I, p. 384.

[158] To Hooker, November, 1844, More Letters, vol. I, p. 43.

[159] To Lyell, October, 11, 1859, Life, vol. II, p. 10.

[160] Greeks to Darwin, p. 156.

[161] Greeks to Darwin, p. 233.

[162] To Lyell, March 12, 1863, Life, vol. II, p. 199.

[163] Marcus Herzog, introduction to Samuel Butler’s Unconscious Memory, p. XII.

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

[165] More Letters, vol. I, p. 37.

[166] MS. Journals, in Life, vol. I, p. 363.

[167] To Horace Darwin, December 15, 1871, Family Letters, vol. II, p. 207.