Fire, Civilization in relation to, ix, 308, 309, xv, 229; discovery of, v, 349; possibility of life in, ii, 251; production and sources, viii, 89, xv, 229-32; production by air compression, v, 128; production of, by friction, iv, 48-9; religious associations of, xv, 234 "Fire Animal," xii, 20 Firearms, v, 361-8, 379; ignition systems, viii, 145 Fire Balloons, v, 223 Fire Damp, iii, 354 Fire Engine, Ericsson's steam, v, 378; Hero's, xvi, 92-3 Fire Extinguishers, carbon tetrachloride in, v, 212; chemical and electric, vi, 101, 102 Fireflies, xii, 124; as ignis fatuus, i, 346; light of, vi, 268 Fire Hazard, electricity and, vii, 51-2, 223, 224; in rural districts, 231; reduced by lightning rods, i, 156 Fire Proof Type of Construction, vii, 55 Fire Pumps, v, 114 Fire Underwriters, Board of, vii, 53-4 Fires, caused by overloaded circuits, vii, 34; cause of "spalling" in, iii, 24; crowd psychology at, xi, 327-8; dust from, i, 56-7; extinguishing of, viii, 56-7; prairie, xiii, 374, 375; rain control by, i, 345; records in tree rings, xiii, 25 Fire-Weather Warnings, i, 240 Fireweed, seed dispersal, xiii, 343-4 Fir Trees, dominance in north, xiii, 350; forests of U. S., 367-8; in landscaping, 270-1 (see also Conifers) Fish, as food, ix, 24; calories in, 299; food value, viii, 362-3; vitamines in, x, 262 Fishes, Age of, iii, 20, 21, 283, xv, 71; anatomy and physiology of, xii, 132-6; bony, 151-3; breeding habits, 140-1; carelessness of offspring, xv, 275; cartilage skeletons of lowest, ix, 58; catching of, by savages, xv, 227-8; catching of, with cormorants, 223-4; classification, iii, 260, xii, 142; deep sea (see Deep Sea); eggs, 140-1, 155, xv, 21, xvi, 116; evolution, iii, 282-5; food of, ix, 24; intelligence in, xii, 139-40; leeches and, 56; migrations in relation to plankton, xvi, 147-8; modern, xii, 154-66; number of species, xvi, 146-7; of oceanic islands, xiv, 278; oxygen supply of, viii, 35, ix, 182; rate of increase in, xv, 20; regeneration in, xii, 170; reproduction in, 140-1; sense organs, 137-9; "showers," of, i, 355; temperature variations, 317; temperature variations, effects, ix, 78 Fish-eye Views, iv, 374 Fishhawks, xii, 260 Fish Patrol, Aerial, i, 48 Fission, xii, 26 Fissures, defined, iii, 378; ore deposits in, viii, 199 Fissure Springs, xiv, 138, 152 Fitch, John, steamboat, v, 189 FitzRoy, Admiral Robert, i, 224-5, 282, 363 Fiume, importance to Jugoslavs, xiv, 268, 306 Fixation (sight), how we learn, xi, 39-40 Fixed Stars, ancient idea of, ii, 350; motions of, 46, 86-7, 121-2, 304-5 (see Stars) Fjords, Fjord Coasts, xiv, 258-62; Norwegian, formation of, iii, 79; Norwegian, frost smoke, i, 95 Flagellate Cells, xii, 30-1