Force, vital, correlation of, 36; planes of, 314; evolution of, 315; idea of, from within, 342. Forces, resident, evolution by, 27; of Nature are forms of Divine energy, 317; different planes of, 314. Fore-limbs, vertebrate, homologies of, 113. Generation, spontaneous, 15. Geographical faunas and floras, 183; diversity, theory of, 193; diversity explained by evolution, 195; present diversity determined by Glacial epoch, 198; objection to this view, 217; answer, 219. Geological record, imperfection of, 252. Glacial epoch determined distribution of species, 195, 198, 215; changes during, in America, 198; in Europe, 199. God, relation of, to Nature, 297; immanence of, in Nature, 300; relation of, to man, 326; personality of, 332; necessary belief in, 344; different forms of conception, 351. Good and the true, relation of, 277. Grasshopper, external anatomy of, 143. Gravitation, relation of, to evolution, 49; and religion, 281. Gyroscope, 288. Heliocentric theory and religion, 280. Hind-limbs, vertebrate, homologies of, 121. Horse, genesis of, 126. Homologies of vertebrate skeleton, 111; of vertebrate fore-limbs, 113; of vertebrate hind-limbs, 121; of articulate skeleton, 132. Homology and analogy, 99; only within primary divisions, 108. Hyatt, A., on Planorbis, 254. Ideal, relative and absolute, 364. Idealism, true and false, 301. Immortality in accord with law, 316. Individuality, organic, 325; spiritual, 325. Innocence and virtue compared, 372. Inorganic forms, law of continuity applied to, 54. Intermediate forms between artificial varieties, 232. Islands, continental and oceanic, 207. Kepler compared with Agassiz, 47. Lamarck, evolutionary views of, 33, 74. Law of differentiation, 11, 19; of progress of the whole, 13, 22; of cyclical movement, 16, 22; of continuity, 53; of continuity applied to inorganic forms, 54; to organic forms, 56; of differentiation illustrated, 144; of acceleration, 178; of cross-breeding, 218, 236. Laws of evolution, 11, 19. Lepidosiren, 101. Life, nature of, 35; imperfectly subject to experiment, 40; relation of, to philosophy, 277. Limbs, vertebrate, homology of, 113. Links, connecting, 12, 57, 145; connecting, elimination of, 248; connecting, usually absent from geological faunas, 251. Liquidambar, 218, 220. Lobster, external anatomy of, 136. Lungs, formation of, 100. Madagascan fauna explained, 205. Mammals, age of, 17. Man, age of, 18; relation of, to Nature, 304; relation of, to animals, 311; spirit of, in relation to the forces of Nature, 313, 316; relation of God to, 331. Marsupials, 201. Materialism, relation of, to evolution, 284; basis for, in brain-physiology, 306; basis for, in evolution, 311.