Berthelot, on dragon-tree of Orotava, 96 Bertrand, M. G., on sorbose fermentation, 106 Bertrand and Weisweiler, on _Bacillus bulgaris_, 179 Besredka, M., on blood serums, 148, 149 Bielschowsky, biographer of Goethe, 269 Blanchard, E., on age of carp, 50 Birds, intestinal flora of, 76, 79 longevity of, 52 Blindness, 248, 257 Bloch, Dr. I., on Schopenhauer, 247 Blood-vessels, hardening of, in the old, 31 Bodio, on infant mortality, 85 Boerhave, on gerokomy, 136 Bones, degeneration of, 29, 30 Bordet, M. J. M., on serums, 148 Botulism, poison of, 70, 82 Bouchard, M., on disinfection of intestines, 156 Bouchet, M., on constipation after parturition, 68 Bourneville, M., on effects of extirpation of thyroid, 34 Boveri, M., produced atherana by nicotine, 32 Bone, marrow, in old age, 37 _Botryllus_, 219 Boutroux, definition of morality, 303 Bradyfagy, 159 Brain, anæmia of, as cause of sleep, 122 Brehm, on age of cattle, 55 Brettes, criticism of “rudimentary organs,” 186 Bricon, M., on effects of extirpation of thyroid, 34 Brigand, Calabrian, fear of death, 194, 195 Brillat-Savarin, quotation from, 126 Brown-Séquard, specific for long life, 139, 277 Brudzinsky, M., on use of lactic microbes, 181 Buddha, on pessimism, 233, 247 Buehler, Dr., on cause of old age, 16 Buffon, on duration of life, 40, 50 Bulgarian bacillus, 178, 179, 180, 181, 182 Bunge, on relation between growth and longevity, 42 Burbank, American horticulturist, 326, 328 Butterflies, longevity of, 57 Bütschli, O., on life of cells, 15 Byron, 239, 247, 295 Cachexia, after extirpation of thyroid gland, 34 Caeca, of vertebrates, 60 _et seq._ Cagliostro, elixir of life, 138 Calomel, as an intestinal antiseptic, 158 and syphilis, 146 Camphor, as an intestinal antiseptic, 156 Canary Islands, 96 Cancalon, Dr., on instinct of death, 128, 129 Cancer, and cleanliness, 144 Candolle, A. de, on cypresses of Mexico, 98 on age of trees, 99 Cantacuzène, M., on blood serums, 148 Capital punishment, 305 Carlyle, on “Werther,” 265 Castration, effects of, 272 Cats, longevity of, 56 Cattle, longevity of, 55 Celibacy, and education of women, 224 Cell reproduction, rate of, 16 Centenarians, 4, 5, 86, 88, 89, 175, 176 Charcot, on sterilised food, 162, 163 on hysteria, 202 Charron, M., on putrefactive poisons, 69 Chemin, M., on centenarians, 88, 89 Chimpanzee, 185, 192, 193 China, Emperor Chi-Hoang-Ti and immortality, 137 Chopin, a degenerate, 134 Christian morality, 321, 330 Chromophags, action of, 25 Claparède, E., on theory of sleep, 123, 124, 125 Cleanliness, and increase of life, 144 Clergymen, increasing duration of life of, 142 Coffee and longevity, 92 Cohausen, on gerokomy, 137