Kinases, 92. Kinematographic analysis, 316. Lamarck, hypotheses of evolution, 220. Lamarckian inheritance, an inadequate cause of transformism, 227. Lankester, acquired characters not inherited, 221. Laplace, and universal mathematics, 215. Laplacian mind, 299. Larval stages, 170. Latency (of characters), 195. Lavoisier, and chemistry of the organism, 127. Life and adaptation to physical conditions, 338; and reversibility, 339; a direction of energies, 341; defined energetically, 337; cosmic origin of, 338; physical conditions for, 338; limited in power, 306; sparsity of, on the earth, 306; tends to arrest dissipation of energy, 314; its origin a pseudo-problem, 337. Life-substance, the primitive, 301. Locomotion, 258. Loeb and the associative memory, 155; and artificial parthenogenesis, 176; mechanism and life, 127; stereotropism, 19; theory of tropisms, 144; tropistic movements, 146; theories of heredity, 181. Limit, the mathematical, 346. Limits to perceptual activity, 23. Links, missing, 252. Linnean species, 201. Manifoldness, intensive, 302. Mass, 353. Mass action, 140. Materialism, 85. Mathematics, evades consideration of time, 35. Matter, 353; inert, 375; notion of is an intuitive one, 352. Maxwell, and sorting demons, 116, 377. Mayow, and chemical physiology, 126. Mechanical work, done by the animal, 67; not done by the plant, 71. Mechanism, organic and inorganic, 78; the thermodynamic, 66; radical, 215; in life, 121. Membranes, semi-permeable, 95. Memory, 39; a possible cerebral mechanism of, 158; mechanistic hypotheses impossible, 157. Mendelism, 196; a logical hypothesis, 199; terminology is a symbolism, 198; analogy of unit characters with chemical radicles, 197; transmission of characters of, 230. Mesoderm, 177; origin of, 255. Metabolism, 37, 88, 209; analytic, 269; of animals, 65, 67; constructive, 269; destructive, 269; direction of, 69; in green plant, 70, 75; intra-cellular, 99; integration of its activities, 111; rôle of oxygen in, 105; specialisation of during evolution, 305; synthetic, 269. Metaphysics of science, 45. Metazoan animals, 162. Mitosis, 182. Mobility, organic, 269; structural adaptations tending to, 275. Modifications of structure adaptive and non-adaptive, 251. Molecules, 353; size of, 116; in a gas, 115; aggregations of, 108. Molluscs, morphology of, 249. Morgan, and physico-chemical mechanisms, 128, 143. Morphogenesis, 257. Morphological evolution, tendencies of, 295. Morphological structures degeneration of, 251; suppression of, 250; coalescence of, 250; replacement of, 250; specialisation of, 250; change of function of, 251.