Food, of ancestral man, 74 instinct of choice of, 75, 76 Fossorial wasps, 27, 34 Future life, Cicero on, 169 Fichte on, 176 Kant on, 176 Plato on, 168 belief in, 141, 149, 151, 159 opposed by reason, 161, 165 _see_ Immortality General paralysis, symptoms of, 111 Gerontology, science of old age, 297 Glow-worms, 37 Goal of human life, 300, 301 Gods, of the Greeks, 4 of the Orientals, 4 Goncourt, E. de, quotations on fear of death, 121, 132 Gorillas, old age in, 233 Greek art, 5 philosophy, 5 Gruenbaum, on injection of serums, 54 Guinea-pigs, reared without microbes, 249 Guyau, on death, 195, 196; on love, 196 on religion and death, 133 on failure of science, 222 on resignation, 199 Haeckel, on the “cellular soul,” 269 on future life, 221 on morality, 107 Hair, blanching of, 242 (figure), 243 and disease, 63 of embryo, 63 Hammerling, on optimism, 191, 192 “_Hamlet_,” quotation from, 227 Hands, of man and apes, 43 Happiness, Hartmann on, 186 Mailaender on, 189 Meyer-Benfey on, 198 meaning of, 111 Hartmann, on death, 184 on immortality, 184 pessimism of, 183 on progress, 185 as a youthful pessimist, 117 Hassenstein, on childbirths in the young, 283 Heape, on menstruation, 88 Hegel, death from cholera, 120 Heim, on feelings at death, 126 Hell of Chinese Buddhists, 149 Helmholz, on the eye, 78 Henseler, on ages of patriarchs, 259 Hermaphroditism, 79, 80 _Herminium monorchis_, figure of, 26 Huber, on ants, 34 Hufeland, on prolonging life, 258 Humanity, vagueness of conception, 296 Humboldt, on natural morality, 8 Hunt, on burial of the aged living, 152 Hutcheson, on naturalism, 7 Huxley, on origin of man, 41 Hymen, disharmonies of, 85 distinctive of human race, 81, 82 primitive function of, 85, 86 ritual destruction of, 83, 84 Illusion, Hartmann on, 183 Mailaender on, 188 Immortality, Aristotle on, 169 Buddha on, 147 Hartmann on, 184 Meyer-Benfey on, 198 Plato on, 168 Schopenhauer on, 179, 180, 181 Seneca on, 170 Spinoza on, 175 amongst animals, 270 of “cellular soul,” 269 of protozoa, 264 of reproductive cells, 267 Inaudi, the calculator, 58 Infanticide, 103, 104 Infusoria, conjugation of, 231 immortality of, 263, 264 reproduction of, 230 senile degeneration of, 231 Insects, compared with vertebrates, 276 fertilisation of plants by, 21 senile degeneration of, 231 Instinct of death, 281, 282, 283, 298 of family, 108 of life, 129 sexual, 283 of society, 109 Intestines, bacterial flora of, 248, 249 large, degeneration of, 70 large, diseases of, 73, 74 large, excision of, 70 large, function of, 70, 71, 72 Jewish belief in future life, 142 Justice, in relation to humanity, 112 Kant, on future life, 176 Kephir, use of, 255 Khémâ, legend on immortality, 147 Kidney ducts, 80