Cohendy, Dr. M., on Bulgarian bacillus, 178 on intestinal flora, 78, 79 on intestinal putrefaction, 168 on thymol as a disinfectant, 157 Collectivism, 228 Colon, absorption in, 64 Constipation, evil results of, 67, 68, 69 Cooking, effect of, on microbes in food, 162 Copenhagen, suicide in, 3 Coral polyps, 216 Cornaro, 91 Cossacks, and biennial rye, 100 Cretinism, compared with senility, 32 Crœsus, 197 Cryptogams, life of, 99 Cursorial birds, intestinal flora of, 76 Cypress, age of, 98 Czerny, M., on absorption in colon, 64 on cancer, 144 D’Alton, and Goethe, 280 Dalyell, old anemone of, 48 Dana, on _monstrilla_, 115 Darwin, on fear, 195 David, King, 136 Death, instinct of, 128, 129 natural, 94, 109, 119 sensations at approach of, 126, 127, 130 Debreuil, Ch., on defecation in rheas, 76 on excreta of antelopes, 66 Degenerates, famous, 134 Delage, Yves, criticism of instinct of death, 128 on function of large intestines, 65, 66 Demange, M., on old age, 119 Denmark, suicide in, 3, 237 Descent of man, 184 Despotism, and socialism, 230 de Vries, H., on duration of life of plants, 104 on prolongation of life of plants, 100 on natural death in plants, 101 Diet and longevity, 46 Digestive system and senility, 59 _Diplogaster_, mother killed by larvæ, 111 Diphtheria, 323 Disease, and shortening of life, 145 _et seq._ Doctors, lady, 225 Dodo, 213 Dogs, longevity of, 55 Dostoiewsky, quotation from, 2 Doyen, M., operation on double monsters, 216 Dragon-tree, of Orotava, 96, 97, 98 Drakenberg, age of, 87 Drunkenness, and morality, 317 _Dryopithecus_, 334 Ducks, old, 11 Duering, on pessimism, 248 Durand-Fardel, M., on atheroma, 30 Duration of life, in animals, 39 _et seq._, 133 Eagles, intestinal flora of, 82 Ecclesiastes, quotation from, 233 Eckermann, narrative of Goethe’s last years, 271, 274, 279 Egoism, 227, 306, 331 Egyptian milk, 105 Eimer, Th., on intestines of bats &c., 62, 63 Einhorn, Dr., on bradyfagy, 159 _Elective Affinities_, Goethe’s, 273 Elephants, 9, 54, 83, 197 Eliot, George, 322 _Elixir vitæ_, 138 Ellenberger, on digestion in horse, 78 Enriquez, on infusoria, 13 Ephemeridæ, duration of life of, 113, 118 Epicureans, 309 Epiphyses of bones, as giving period of growth, 40 Ermenghem, van, on botulism, 70 Errera, Dr., on cause of sleep, 121 _Eudoxia_, 218 Ewald, on absorption in colon, 64 Exhaustion, as cause of plant death, 104, 107 Extinction of animals, 213 Eye, in old age, 36 Fatigue, Weichardt on cause of, 123 “_Faust_” and Goethe, 283 _et seq._ Favorsky, Dr., on botulism, 82 Fear, analysis of, 194 Fecundity and duration of life, 43, 44, 45, 57, 58 Feinkind, case of somnambulism quoted from, 204 Femininist movement, 224 Fermentation, cause of, 105