Differentiation, law of, 11, 19; law of, in embryonic development, 19; law of, illustrated, 144; of the animal kingdom illustrated, 176. Disease, necessity of, 367. Divine energy, forms of, 318. Divisions of the animal kingdom, 117. Dogmatism, theological and scientific, 293. Domestication, changes produced by, 222. Egg, development of, 3, 19. Egyptian species unchanged in three thousand years, 265. Embryology, proofs of evolution from, 148. Environment, physical, 73. Evil, problem of, relation of evolution to, 365; physical, necessity of, 366; a condition of progress, 366, 373; organic, necessity of, 367; moral, necessity of, 369. Evolution, what is, 3, 8; scope of, 3; type of, 3, 8; examples of, 5; popularly limited to the organic kingdom, 7; progressive change in, 9; laws of, 11; illustrated by branching tree, 13-15, 18, 90, 250; misconception of, 14; produced by resident forces, 27; germs of the idea, 32; relation of Agassiz to, 32, 37, 43; Lamarck’s views on, 33; Chambers’s views on, 34; obstacle to, removed, 35; confliction with religion imaginary, 45; how related to gravitation, 49; general evidences of, 53; artificial, 60; observed, 62; certainty of, 65; special proofs of, 67; factors of, 73, 81; human contrasted with organic, 88; monotypal and polytypal, 85; proofs of, from the vertebrate skeleton, 111; from the articulate skeleton, 132; from embryology, 148; from development of amphibians, 150; from aortic arches, 151; from vertebrate brain, 162; from rudimentary organs, 179; from geographical distribution of organisms, 183; explains geographical diversity, 195; objection to this view, 217; answer, 219; proofs of, from artificial modifications, 222; factors of, operative in domestication, 228; paroxysmal, 257; material, nearly completed, 267; thoroughly established, 275; relation to religion, 276, 282; relation to materialism, 284; necessitates great change in religious thought, 295; of forces, 315; relation to revelation, 331; pantheistic objection answered, 335; relation to problem of evil, 365. Experimental method largely fails on plane of life, 40. Factors of evolution, 73; their grades and order of introduction, 81; Lamarckian, 81; selection, 82-85; Darwinian, 83; rational, 86. Faculties, evolution of, 23. Faunas and floras, geographical, 183; continental, 188; marine, 192; special cases of distinct, 192; of Australia, 200; of Africa, 204; of Madagascar, 205; of continental islands, 208; of the coast-islands of California, 211; of oceanic islands, 213; of lofty mountains, 215. Fish-tails, changes of, in development, 172; in evolution, 174. Fishes, age of, 17. Floras and faunas, geographical, 183.