Bates, H. W., and nature, 12. _Beagle_, D.’s voyage, 4. Bell, Thomas, and D., 173. Bergson, Henri, and evolution, 235. Bryce, Lord, on D. and Gladstone, 133; on D.’s appearance, 168. Buckle, H. T., D. on, 143. Buffon, Comte de, and evolution, 84, 119. Burbank, Luther, and experiment, 57; and future life, 228. Butler, Samuel, D.’s controversy, 108; and religion and evolution, 237. Byron, Lord, and nature, 152. Candor, D.’s trait, 77-79, 105. Castle, W. E., on experiment, 57. Caution, element in scientific spirit, 245. _See also_ Deduction. Chambers, Robert, and evolution, 84. Children. _See_ Family. Civil War, D.’s interest, 134. Collecting, D. and, 43. Comparison, D.’s trait, 31. Conklin, E. G., on natural selection, 125; on evolution and religion, 239. Conscience, activity of D.’s, 160. Controversy, over evolution, 6; D.’s attitude, 76, 77, 107. Conversation, D.’s, 170. Coolidge, Calvin, on politics and religion, 222. Copernicus, and orthodoxy, 209. Coral reefs, D.’s theory, 64-66. Correspondence, character of D.’s, 78, 145. Cowper, William, and nature, 149, 150. Creation, desire, 98. Criticism, D.’s attitude, 104-17. Cruelty, D.’s hatred, 135. Curiosity, element of scientific spirit, 248, 249; Sainte-Beuve and Goethe and, 268, 270. Darwin, Charles R., influence, 3; character, 3; birth, 3; ancestry, 3; education, 4, 45; interest in outdoor life and sport, 4, 174-76; _Beagle_ voyage, 4, 14; marriage, home and children, family life, 4, 196-201; invalidism, patience, 5, 36, 177-83, 193-95; tomb, 6; scientific observation, on it, 6, 14-16; and self-analysis, 16; study of expression, 17-19, 198; promotion of observation by others, 19, 23; accuracy, 21-24, 59; and detail, 25; industry and patience, 27-30, 252; system, 30, 31, 183; element of comparison, 31; difficulties and discomforts of outdoor observation, 32-34; sympathy, and observation, 34-36; effect of physical limitations, 36, 37; and collecting, 43; and observation and deduction, 44-46, 250; on Spencer, 47, 78; and deduction and induction, 46-48; mental power and activity, 48; control over theorizing, 51, 54, 55, 115, 124; on excessive theorizing, 52, 53, 254; and experiment, 56-62; exposition, style, caution, 62-64, 143-45, 212; on coral reefs, 64-66; on sexual selection, 66, 67; on pangenesis, 68; and metaphysics, 69; doubt and self-criticism, 70, 71; and objections and difficulties, 71, 72, 113-15; and revision, 73, 118; and argument, 74-76; and controversy, 76, 107; and mistakes, 77; candor, 77-79, 105; as correspondent, 78, 145; appreciation and tolerance, 79, 80, 262, 263; and ignorance and deceptive reasoning, 80-82; and motives of achievement, 99-101; Butler controversy, 108; humility, 110, 258, 260; success of books, 122; fame, 126; atrophy of other interests, 128-30, 272, 275; and history, 130, 131; and politics, 131-34; and Civil War, 134; and slavery, 134; and animals, hatred of cruelty, 135, 188; and