Goethe, J. W. von, on repetitions, 59; on doubt, 70; on mistakes, 77; and evolution, 85; and poetry, 148; on love of truth, 265; and scientific spirit, 270, 271; pessimism, 274; on active ignorance, 279. Gould, George M., on D.’s invalidism, 180. Grant Duff, Sir M. E., on D., 182. Gray, Asa, on D.’s observation, 14; on D. as thinker, 49; relations with D., 110; and evolution, 121, 238. Häckel, Ernst, and D., 110; and evolution, 122; atheism, 219. Hartmann, K. R. E. von, and evolution, 233. Hegel, G. W. F., type, 53; and evolution, 233. Hell, obsolete, 227. History, D. and, 130, 131. Homer, on self-ignorance, 282. Hooker, Sir Joseph, on Darwin-Wallace paper, 94; and D., 101, 110. Hospitality, D.’s, 169. Humanity, and study of natural history, 40-43, 136; Sainte-Beuve’s study, 267, 268. Humility, D.’s trait, 110; and scientific spirit, 257-61. Huxley, T. H., on D. and detailed observation, 26; on D.’s industry, 27; and induction, 46; on D.’s mental processes, 62; on D.’s candor, 79; on effect of _Origin of Species_, 96; and Bishop of Oxford’s attack, 103; restraint of D., 108; on D. and adverse suggestions, 115; and promulgation of D.’s theory, 121; on D.’s style, 144; relations with D., 203-05; on influence of D.’s appreciation, 206; and religion, 219; on D.’s impartiality, 256. Ibsen, Henrik, effect of evolution on, 241. Ignorance, realization and scientific spirit, 257, 283. Imagination. _See_ Deduction. Immortality, D.’s attitude, 163; effect of evolution, 215. Impartiality, element in scientific spirit, 255; Sainte-Beuve and, 268. Induction, and deduction, 46-48. _See also_ Deduction. Industry, D.’s, 27; element in scientific spirit, 251. Inheritance of acquired characters, Lamarck’s theory, 85, 90; D.’s attitude toward, 87, 119, 120. Instruments, D.’s faith, 25. Instinct in practical life, 278, 279. Interests, absorption and atrophy, 128-30, 272. Invalidism, D.’s, 5, 36, 177; his attitude toward it, 178, 179, 194; cause, 179-81; Mrs. D.’s care, 193-96. James, William, and evolution, 234. Jeffries, Richard, and nature, 12. Jonson, Ben, on observation, 7; on self-ignorance, 282. Kingsley, Charles, on evolutionary theory, 121; on D.’s conversation, 171. Knowledge, and observation, 38-40; and wisdom, 44. Krause, Ernst, biography of Erasmus Darwin, 108. Lamarck, Jean de, evolutionary theory, 85, 90, 119, 120; D.’s attitude, 86. Land question, D. and, 136. Leibnitz, Baron von, and gravity, 257. Leopardi, Giacomo, pessimism, 238, 245. Literature, D.’s attitude, 143, 145-48; D.’s style, 143-45; effect of evolution, 225-27. Linnæan Society, Darwin-Wallace paper, 94. Lodge, Sir Oliver, and science and spiritualism, 238. Love, D.’s valuation, 206. _See also_ Family; Friendship. Lubbock, Sir John, on debt to D., 202. Lucretius, type, 54; scientific ardor, 265. Lyell, Sir Charles, on controversy, 76; and evolution, 84; and D., 101, 110; on D. and ‘remorse,’ 211.