Bacteria, a dominant group, 259; distribution, 259; geological history, 259, 261; morphology, 268; metabolism, 266; specialisation, 263; parasitism, 259; nitrogen, 73; prototrophic, 119, 266; paratrophic, 266; putrefactive, 266; fermentation, 266; and Brownian movements, 119; compensatory to plants, 267. Bergson, 28; creative evolution, 244; duration, 154; animals and plants, 78; eye of Pecten, 234; inert matter, 375; infinitesimal analysis of the organism, 111; kinematographic analysis, 110; theory of intellectualism, 51; memory, 156; morphological themes, 250; theory of pain, 281; theory of perception, 7, 10; the vital impetus, 318. Biology, systematic, 201, 203. Biophors, 132; size of, 183; growth of, 185. Biotic energy, 325. Borelli and animal mechanism, 125. Brownian movement, 118; significance of, 119. Bryan and thermodynamics, 62. Bud-formation, 165. Calculus, infinitesimal, 25, 115, 350. Calorimetric experiments, 65, 68. Capacity-energy factors, 61. Carnot’s cycle, 69, 78, 113; negative, 368; description of, 363, 366; compared with plant metabolism, 75; compared with the organism, 73. Catalysis, 90; universality of, 91. Catalysts, characters of, 91. Categories of organisms, 209. Central nervous system, specialisation of, 273; a switchboard, 273; evolution of, parallel with evolution of muscular system, 281. Chance in evolution, 237. Chemical affinity, 361. Chemical energy, degradation of, 75. Chemical reactions, direction of, 78; exothermic, 86; explosive, 86; similar in organic and inorganic systems, 78. Chemical synthesis, involve vital activity, 318. Chemistry, medieval, 125. Chlorophyll, 69. Chlorophyllian organisms, 88; metabolism of, 265; a dominant group, 259; essential morphology of, 268; distribution of, 260. Chromatin of the nucleus, 130; the material basis of inheritance, 182. Chromosomes, 130, 182, 183. Classification of organisms, 209. Classificatory systems, are artificial arrangements, 289; suggest evolutionary process, 210. Clausius, 54; and Carnot’s Law, 113. Cœlenterates, morphology of, 248. Cœlomate animals, 256. Colloidal platinum, 91. Colloids, 107. Colonial organisms, 164. Comparative anatomy, task of, 251. Compensatory energy-transformations effected by life, 309. Conjugation, 173; and heredity, 176; a stimulus to growth, 175.