Fabre, M.--on Darwin's facts, 200 n.; on our ignorance of Nature, 203 Faraday, Prof.--on gravitation, 125 Final causality (Teleology), 98 _seq._ First Cause, the object of inference, 96, 97; nature of as shown by reason, 270 _seq._ Fish, appearance of, 225; problems presented by, 233 Flight, problem of, 93 Flower, Sir W.--on the extinct American horse, 254 Force, nature of, 23 Free-will, Prof. Haeckel on, 33, 81; Dr. Johnson on, 84 Fuegians, mental likeness to ourselves, 72 Garnett, Prof.--on force, 23 Gaudry, M.--on ancestry of whales, 257; of bats, 258; of proboscidians, 259 Genera and species, 244 n. _Generatio aequivoca_, 65 Generation, mysteries of, 123 _seq._ Geological formations, succession of, 213 Geological record, 216, 264, _seq._ Giraffe, evolution of, 154 Glass, fortuitously discovered, 115 Goethe--on "iron law," 14 Gore, Dr. G.--on machinery as excluding idea of design, 118 "Grand Question," the, 96 Grimthorpe, Lord (Sir E. Beckett)--on matter, 37; on the problem of flight, 93; on evidences of purpose, 94; on generation, 124; on the structure of the eye, 155 n. Gymnosperms, appearance of, 219 Haeckel, Prof. E.--on "rational view of the world," 10-14; on the "magic word evolution," 16; on scientific method, 18, 20; on the law of substance, 13, 23; on the conservation of energy, 23, 24, 26; on the "Seven Enigmas," 33; on the nature and properties of matter, 35, 39; on the artificial manufacture of protoplasm, 59; on free-will and determinism, 81; on design in Nature, 90, 150; on chance, 117; on Monism, 128; on annihilation as a desirable end, 130; on the ultimate reality, 135; unfounded claims on behalf of Darwin, 150; bases arguments on lack of knowledge, 183; on rudimentary organs and "Dysteleology," 190; on single origin of every species, 210; on the appearance of the _Apetalæ_, 221; invents geological "ante-periods," 236; and intermediate forms, 261; his pedigree of man, 261; his method of solving the riddles of Nature, 264 Heredity, 83, 99 Herschel, Sir J.--on molecules as manufactured articles, 89; on evidence of mind in Nature, 100; on gravitation, 125 _Hesperornis_, 171 Heurtin, Marie, 77 _Hippops_, 246, 252 Hird, Mr. D.--on the omnipotence of Evolution, 14; on transformations of force, 129 Holland, Sir H.--on structure of ear, 93 Homer, a "half-savage Greek," 69 n. _Homo alalus_, and _sapiens_, 81 Horse, structure of, 94, 240 Genealogy of, 236, 241 _seq._ Hudson, Dr.--on neglect of study of present life in favour of evolutionary speculations, 185 Humboldt, W. von--on human speech, 76 Hutton, F. W.--on finite duration of the world, 2; and of the universe, 28; on dissipation of energy, 27 n.