Consciousness, in brute bodies, 244 _et seq._ Continuity, principle of, 242, 247 Contractility, 26 Contraction, energy of static and dynamic, 75 Conservation, of energy, 58; of force, 58 Crystals, 200 _et seq._, 237 _et seq._, 281 _et seq._ Cytoplasm, 161 _et seq._ Death, apparent, 232; senescence of, 305 _et seq._; cellular, 321 _et seq._ Decentralization, 24 Degeneration, 326 Destruction, functional, 106; organic, 211; of living matter, 213 Determinism, 49 Digestion, of plants and animals, 152 _et seq._ Direction, idea of, 16 Dominants, 33, 39, 45 Dyne, the, 71 Effort, of force, 71 Electrolysis, 272 Energetics, 39, 56; laws of biological, 105 _et seq._, 229; alimentary, 116 _et seq._ Energy, 37, Book ii., _passim_; origin of idea of, 57; theory of, 62; the only objective reality, 64-5; and kinetic conception, 67; mechanical, 69, 73; of contraction, 75; kinetic, 76, 83; potential, 76, 83; virtual, 77; of motion and position, 79; thermal, and its measurements, 80-2; chemical, and its measurements, 81-2; chemical and potential, 83; materialization of, 84; transformations of, 85 _et seq._; luminous, 86 _et seq._; conservation of, 90 _et seq._; capacity of conversion of, 93; in biology, 97; in living beings, 99 _et seq._; physical, 99 _et seq._; vital, 99 _et seq._ Ether, 89 Equivalence, law of, 91 Excitability, 26-7 Fatigue, of metals, 264 Ferments, butylic and butyric, 193 Filiation, 250 Finalism, 43 Food, a source of energy, 118 _et seq._; thermogenic and biothermogenic types of, 131 _et seq._; dynamogenic type of, 143; nitrogenous, 143; of animals and plants, 153 _et seq._ Force, directive, 16 _et seq._, 32, 39, 48; vital, 45; an anthromorphic notion, 71; and work, 74; measurement of, 71; plastic, 143; plastic and morphoplastic forces, 208 Form, specific, 199 _et seq._, 281 Fruits, acids of, 136 Gemmules, 167, 258 Generation, spontaneous, 249 _et seq._, 294 _et seq._ Globulin, 178 Glycerine, crystals of, 302 Glycogen, 108, 153 _et seq._ Gramme, 71 Heat, a mode of motion, 61; rôle of animal heat, 122; mechanical equivalent of, 81; an excretum, 114; a degraded form of energy, 88; converted into work, 92 Heterogeneity, 38, 61 Histones, 179, 182 _et seq._ Horse-power, 75 Hyaloplasm, 161 Iatro-chemistry and mechanics, 34-5 Idioblasts, 167 Infusoria, death of, 337 Instability, 188 _et seq._ Instinct, of life and death, 345 _et seq._ Intussusception, 291 Invariant, mass the first, 63 Irreversibility, of vital energies, 104 Irritability, 27, 196 _et seq._ Isodynamism, 142 Isomorphism, 286 Ka, the, 8 Kilogrammetre, 72, 75; per second, 75 Kilowatt, 76 Kinetic theory, 39, 62 Knot, the vital, 21