A new order of things is the result of the processes we have indicated. The segregated, available heat-energy of material bodies has become transferred to the un-co-ordinated, diffuse, unavailable energies of the molecules which compose these bodies. The transformations which we can effect depend on the condition that the energy which we utilise is that of aggregates of molecules which are in a different physical condition, as regards this energy, from adjacent aggregates. But when this energy becomes equally distributed among the molecules of all the aggregates, the matter in which it inheres becomes inert. If we could, by a sorting process like that of Maxwell’s hypothetical demons, a process which does not expend the energy with which it deals, separate the molecules which were moving slowly from those which were moving more quickly, we could make this energy again available. But it must clearly be understood that our physics is the physics not of individual molecules, but of aggregates of molecules. INDEX Absolute, Driesch’s theory of, 47. Acceleration (in physics), 355. Acquired characters induced by the environment, 216; a means of transformism, 220; evidence of transmission scanty, 225; transmission not inconceivable, 226. Actions, categories of, and consciousness, 282; deliberative, 283; mechanistic hypothesis of, 157; stereotyped, 283; at a distance, 304. Activation of the ovum, 176. Adaptability, indicative of dominance, 258. Adaptation, 217; and acquired characters, 219; and changes of morphology and function, 219; not inherited, 220; causes of, 239. Adaptive response, 219. Adiabatic changes, 361. Aggregates, molecular, 353. Algæ, distribution of, 260. Allelomorphs, Mendelian, 231. Alternation of generations, 175. Amido-substances, 88. Anabolism, 88. Anatomical parts, homologies of, 251. Animal action, considered objectively, 278. Animal and plant contrasted, 269. Animality, 269. Annectant forms of life, 253. Annelids, morphology of, 248. Anthropomorphism in theories of action, 148. Anti-enzymes, 94. Antitoxins, 36. Ants, a dominant group, 260. Appendix vermiformis, 250. Approximation, standards of, 347. Armoured animals, 263. Arthropods, morphology of, 249; a dominant group, 259; distribution, 260; musculature of, 275; adaptations for mobility, 275; limits to size of, 275. Assimilation, 67. Atoms, constitution of, 355; arrangements of, 353. Automatism of animals deduced from mechanistic theories, 280. Autonomy in development, 322. Available energy, 62; and entropy, 374.