Ambiguity of the idea of "generality" in philosophy, 230-1, 320-1 of primitive organisms, 99, 112, 113, 129-30 Ammophila hirsuta, paralyzing instinct in, 173 Amoeba, in illustration of imitation of the living by the unorganized, 33-6 in illustration of the ambiguity of primitive organisms, 99 in illustration of the mobility characteristic of animals, 108 in illustration of the "explosive" expenditure of energy characteristic of animals, 120, 253 Anagenesis, 34 Anarchy, idea of, 233, 234. _See_ Disorder Anatomy, comparative, and transformism, 25 Ancient philosophy, Achilles and tortoise, 311-2 Alexandrian philosophy, 322-3 Allegory of the Cave, 191 Anima (De), 322 _note_ Apogee of sensible object, 344, 345, 349 Archimedes, 343-4 Aristotle, 135, 174-5, 227-8, 314, 316, 321, 323, 324, 328-33, 347, 349, 353, 356, 370 Arrow of Zeno, 308-13 ascent toward God, in Aristotle, 323 Astronomy, ancient and modern, 334-6 attraction and impulsion in, 323-4 becoming in, 313-4, 317 bow and indivisibility of motion, 308-9 Caelo (De), of Aristotle, 322 _note_, 324 _note_ and Cartesian geometry, 334-5 causality in, 323, 325-6 change in, 313-4, 317, 328-9, 342-3 cinematographical nature of, 315 circularity of God's thought, 323-4 concentric spheres, 328 concepts, 326-7, 356 "conversion" and "procession" in, 323 degradation of ideas into sensible flux, 317-8, 321, 323-4, 327, 328, 343-5, 352-3 degrees of reality, 323-4, 327 diminution, derivation of becoming by. _See_ Degradation of Ideas, etc. duration, 317-9 _note_, 323-4, 327-9 Eleatic philosophy, 308, 314 Enneads of Plotinus, 210 _note_ essence and accident, 354 essence or form, 314-5 eternal, 317-8, 324-6 Eternity, 317-8, 320, 324, 328-9 extension, 210 _note_, 318, 324, 327 form or idea, 314-20, 322, 327, 329-31, 352 geometry, Cartesian, and ancient philosophy, 334 God of Aristotle, 196-7, 322-4, 349, 352, 356 [Greek: hylê], 353 Idea, 314-22, 352-3 and indivisibility of motion, 307-8, 311 intelligible reality in, 326 intelligibles of Plotinus, 353 [Greek: logos], of Plotinus, 210 _note_ matter in Aristotle's philosophy, 316, 327 and modern astronomy, 333-4, 335 and modern geometry, 333-4 and modern philosophy, 226-7, 228-9, 232, 281-2, 344-5, 346, 349-51, 364, 369 and modern science, 329-30, 336, 342-3, 344-5, 357 motion in, 307-8, 312-3 necessity in, 327 [Greek: noêseôs noêsis], 356 non-being, 316, 327 [Greek: nous poiêtikos], 322 oscillation about being, sensible reality as, 317-8 Physics of Aristotle, 227-8 _note_, 324 _note_, 330-1 Plato, 48, 156, 191, 210 _note_, 316-8, 321-4, 327, 330, 348, 349 Plotinus, 210, 316, 323, 326 _note_, 349, 352-4 procession in Alexandrian philosophy, 323 [Greek: psychê], 210 _note_, 350 realism in, 232 refraction of idea through matter or non-being, 317 sectioning of becoming, 318-9