Absoluteness of duration, 206 of understanding, xi, 47, 152, 190, 197, 199 Abstract becoming, 304-7 multiplicity, 257-9 time, 9, 17, 20-2, 37, 39, 46, 51, 163, 318-9, 336, 352-3 Accident and essence in Aristotle's philosophy, 353 in evolution, 86-7, 104, 114-5, 127, 169, 170, 252, 254-5, 266, 267, 326-7 Accidental variations, 55, 63, 68, 69, 74, 85-6, 168 Accumulation of energy, function of vegetable organisms, 253, 255 Achilles and tortoise, in Zeno, 311, 312-3 Acquired characters, inheritance of, 76-9, 83-4, 87, 169, 170, 173, 231 Act, consciousness as inadequacy of, to representation, 144 form (or essence), quality, three classes of representation, 302-3 Action, creativeness of free, 192, 247 and concepts, 160, 297 and consciousness, xiii, 5, 143-4, 145, 179-80, 207, 262 discontinuity of, 154, 307 freedom of, in animals, 130 as function of nervous system, 262-3 indivisibility of, 94, 95, 308-9 and inert matter, 96, 136, 141-2, 156, 187, 198, 226, 366 instinct and, 136, 141 instrument of, consciousness, 180 instrument of, life, 162 instrument of matter, 161, 198-9 as instrument of consciousness, 180 and intellect. _See_ Intellect and action intensity of consciousness varies with ratio of possible, to real, 145 meaning of, 301-3 moves from want to fulness, 297, 298 organism a machine for, 252, 254, 300 and perception, 5, 11, 12, 93, 188, 189, 206, 227-30, 300, 307, 368 possible, 12, 13, 96, 144, 145, 146-7, 159, 165, 179-81, 188, 264 and science, 93, 195-6, 198-9, 329-30 and space, 203 sphere of the intellect, 155 tension in a free, 200, 207, 238, 240, 301-2 Activity, dissatisfaction the starting-point of, 297 of instinct, continuous with vital process, 139, 140 life as, 128-9, 247 mutually inverse factors in vital, 248 and nervous system, 110, 130, 132-3, 134-5, 180, 252, 261-3 organism as, 174 potential. _See_ Action, possible tension of free, 200, 202, 207-8, 223-4, 237, 239, 300-1 and torpor in evolution, 109, 111, 113, 114, 119-20, 129-30, 135-6, 181, 292 vital, has evolved divergently, 134 _See_ Divergent lines of evolution Adaptation, 50-1, 55, 57-8, 59, 70, 101, 129, 133, 192, 255, 270, 305-6 and causation, 102 mutual, between materiality and intellectuality, 187, 206-7 and progress, 101-2 Adequate and inadequate in Spinoza, 353 Adjectives, substantives and verbs, 303-4, 315 Aesthetics and philosophy, 177 Affection, Role of, in the idea of chance, 234 in the idea of nought, 281-3, 289, 293, 295, 296 in negation, 286-7 Affirmation and negation, 285-6, 293 Age and individuality, 15-6 Albuminoid substances, 121-2 Alciope, 96 Alexandrian philosophy, 322, 323 Algae in illustration of probable consciousness in vegetable forms, 112 Alimentation, 113-4, 117, 247 Allegory of the Cave, 191 Alternations of increase and decrease of mutability of the universe, 245-6 Alveolar froth, 33-4