Consciousness involves analysis of the environment, 11; analysis of, is an arbitrary process, 12; a feeling of normality, 6; a part of crude sensation, 40; simplified by reasoning, 41; an intensive multiplicity, 303; degree of, is parallel to development of sensori-motor system, 280; not existent outside ourselves, 278; not a function of chemico-physical mechanism, 160; intense in difficultly performed operations, 281; and activity of cerebral cortex, 281; absent in parasites, 291. Conservation a test of reality, 357. Conservation of energy, 52; in organisms, 83. Conservation of structure, 253, 256. Constants, mathematical, 344. Continuity of cells in embryo, 171. Contractility, 100; muscular, 103. Co-ordinates, systems of, 23. Corals, 164. Cosmic evolution, 314; is a tendency towards degradation of energy, 316. Creation, special, 214. Curvature, 27. Curves, isothermal and adiabatic, 362. Cuttle-fishes, 250. Cytoplasm, 130. Darwin, and natural selection, 221; acquired characters are inherited, 220; hypothesis of pangenesis, 181. Death, is catastrophic katabolism, 340. Degradation of energy, 81. Deliberation and consciousness, 281. Demons, Maxwell’s, 116. Descartes and mechanism, 121; the rational soul, 123, 318; his physiology, 122; his spiritualism, 124; and animal automatism, 125. Descent, collateral, 257. Determinants in embryology, 132, 183; arrangement of, 184; latent in regenerative processes, 142. Development, organisation in, 128; parthenogenetic, 176; reverses inorganic tendencies, 324; impossibility of chemical hypotheses, 141; is the assumption of a mosaic structure, 301; blastula stage in, 129; gastrula stage in, 130; pluteus stage in, 140; individual, 300. Developmental systems prospective value of, 138; prospective potency of, 138. Diatoms, 163; distribution of, 260. Differential elements, 115. Differentiation in development, 170. Diffusion in the animal body, 95. Digestion, 67; chemistry of, 72. Dinosaurs, an unsuccessful line of evolution, 275. Dissipation of energy, 114; in physical mechanisms, 59; by the organism, 68, 79. Distribution of organisms, 262; limits to, 259; indicative of dominance, 258. Diversity, physical, 54; effective and ineffective, 115. Dominance in geological time, 258; implies long geological history, 261; Mendelian, 196. Dominant organisms, 258, 259, 264. Driesch natural selection, 229; analytical definition of the organism, 331; entelechy, 318; experimental embryology, 134; historical basis of reacting, 154; logical proof of vitalism, 136; proof of vitalism from behaviour, 153; theory of the absolute, 47.