vivisection, 136; and social questions, 136, 137; and æsthetics, 137-40; and music, 140-42; and fiction, 145; and poetry, 146-48; and natural beauty, 148, 153-56; and religion and conscience, 156-63; personal appearance, 168; hospitality, 169; conversation, 170-72; fun, 172; and society, 173, 178; humanity, 176; abstemiousness and indulgence, 182; regimen, 183; finances, 184-86; generosity, 186; manner and temperament, 188; and his father, 190; as fiancé, 190-92; as husband, wife’s care, 192-94; friendship and services, 201-07; impartiality, 256; on scientific ardor, 264; on love of truth, 266. _See also_ Evolution. Darwin, Emma (Wedgwood), 4; and theater, 139; and D.’s religious attitude, 157; D. as fiancé, 190-92, and as husband, 192; as wife, and D.’s invalidism, 193-96; and D.’s theories, 218. Darwin, Erasmus, 4; and evolution, 84, 85; controversy over biography, 108. Deduction, observation and, 44-46; and induction, 46-48; D.’s attitude, 46, 47; D.’s power, 48-50, 69; his control over it, 51, 54, 55, 115, 124; D. on excessive, 52, 53; types of thinkers, 53-55; experiment and, 55; D. and experiment, 56-62; D. and exposition, 62-64; illustrations of his theorizing, 64-69; D. and doubt, 70, 71; D. and objections, 71, 72; his trait of revision, 73; D. and arguments, 74-77; D. and mistakes, 77; D. and deception in reason, 80-82, 115. _See also_ Observation; Scientific spirit. Democracy, evolution and, 223. Details, D. and, 25. De Vries, Hugo, imitation theory, 124. Discipline, D. and his children, 197. Doubt, value, 70; in D.’s logical processes, 70, 71; aspects of agnosticism, 203-05. _See also_ Religion. Drink, D. and, 182. Earthworms, D.’s study, 21, 42, 151. Education, D.’s, 4; training in deduction, 45. Eliot, C. W., effect of evolution on, 246. Emerson, R. W., on evolution, 42, 234; and nature, 151. Empedocles, and evolution, 84. Ethics, D. and morality, 160; and evolution, 213-15, 219, 222, 231.