  - Acceleration, law of, 178.
- African fauna explained, 204.
- Agassiz, his greatest result, 29, 43;
- relation to evolution, 32, 37, 43;
- relation to Darwin, 46;
- compared with Kepler, 47.
- Ages of geological history, 16.
- Alpine species explained, 215.
- Amphibians, development of, 150.
- Analogy and homology, 99.
- Anima of animals, 313, 317.
- Animal architecture, styles of, 209.
- Animal kingdom, primary divisions of, 107.
- Animals, relation of man to, 311;
- spirit embryonic in, 311.
- Antiquity of man, religion and, 282;
- of the earth, religion and, 281.
- Aortic arches, proofs of evolution from, 151.
- Arthropods, 132.
- Artificial production of varieties, 222.
- Australia, fauna and flora of, explained, 200;
- when isolated, 202.
- Barriers limit faunal and floral regions, 188.
- Beauty, origin of, 269.
- Birds’ tails, changes of, 174.
- Brain, vertebrate, proofs of evolution from, 162;
- vertebrate, changes of, in phylogenic series, 168;
- relation to mind, 327, 338.
- Brain-physiology as a basis for materialism, 306.
- Branching tree illustrates evolution, 13–15, 18, 110, 250.
- Brooks, W. K., on the cause of variations, 262.
- Californian coast-islands, fauna and flora of, 211.
- Causation, idea of, from within, 342.
- Cause, first and second, 354.
- Cells, somatic and germ, 93.
- Centers of creation, specific, 194.
- Cephalization, 171.
- Chambers, his views on evolution, 34.
- Changes slow at present, 266.
- Christ, the, 359;
- relation of evolution to, 359;
- as an agent in human progress, 363.
- Close-breeding, effects of, 236, 243.
- Coast-islands of California, fauna and flora of, 211.
- Comparison, method of, 41.
- Conflict between religion and science, 280.
- Continental faunas and floras, 188.
- Continental island life, 208.
- Continuity, law of, 53;
- law of, applied to inorganic forms, 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;
- relati
THE END.
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