Bromine, a halogen, viii, 18, 84; atomic weight and symbol, 383; manufacture, 274; properties and uses, 84-5, 86, 181, 297-8, 333; test, 290 Bronchial Tubes, as infection center, x, 220, 224; defence against germs, 202; subdivisions of, ix, 255 Bronchitis, causes, x, 253, 295 Brongniart, Adolphe, 167, 169 Brontides, i, 195-6, 368 Brontosaurus, xii, 195 Brooklyn, water supply of, xiv, 140 Brooklyn Bridge, completion, v, 382; corrosion of, vi, 66 Brooks Comet, ii, 134, 275, 286 Brook Trout, xii, 159 Broths, viii, 362, 369 Brounov, Prof. P., i, 249 Brown, John, medical work of, x, 89-90 Brown, Robert, xvi, 166 Brownian Movements, viii, 314, xvi, 166 Browning John M., v, 363, 366-7 Browning Machine Gun, v, 366-7, 384 Brown Paper, making of, v, 294; source, xiii, 240 Brown Race, xv, 32; diseases of, 51; peoples of, 37; separate origin theory, 70 Bruce, James, xvi, 123 Bruce Telescope, ii, 136, 302 Brush Discharge, vii, 10-11, 363 Brushes, dynamo, vi, 178, vii, 363 Brussels Sprouts, xiii, 197, 222; mutant nature, 333-4 Buansuah, xii, 345 Bubonic Plague, x, 163-7; native immunity to, xiv, 357; Paré and, x, 153; prevention of, 171; spread by lice, 311 Buckwheat, xiii, 56; family, 194; flower, 46; food, viii, 364; life of, xiii, 53 Budapest, deep drilling, iii, 120-1 Buddhism, development of, xv, 199; Nirvana of, 334 Buds, never on roots, xiii, 22, 23, 29; of perennials, 53 Buenos Aires, harbor of, xiv, 270 Buffalo, N. Y., electric power system, vi, 377-8 Buffalo Bugs, xii, 123 Buffalo Dance, xv, 305-6 Buffaloes, xii, 328-9; of Great Plains, xiv, 383 Buffalo Grass, xiii, 374 Buffalo Hot Springs, xiv, 145 Buffon, founder of modern natural history, xvi, 128; lightning experiments, vi, 15; "Natural History," xvi, 116; on evolution of species, 139-40, 148 Bugles, sounding of, iv, 231 Bugs, xii, 110-14; jaws and maxillæ in, 100 Buildings, development of, xv, 266-72; dryness of air in American, i, 322, 323; earthquake construction, xiv, 342, 343; electric wiring, vii, 55-65; weathering effects, iii, 22, 24 Building Stones, iii, 370-2 Bulgaria, long life of peasants, xiii, 172 Bull Durham Sign, Broadway, vii, 341 Bullets, form and flight, v, 362, 365 Bullfrogs, xii, 180-1 Bumps, in aeronautics, i, 293, 298, 368 Bunch Grass, xiv, 380 Bunsen, carbon arc, xvi, 189; chemical work, 163; solution of spectrum lines, ii, 112 Bunsen Burner, viii, 60-1 Buoyancy, law of, iv, 103-4, 105; of air, 107, 108 Burbank, Luther, xvi, 167 Burdock, seed dispersal, xiii, 58 Burette, viii, 294, 295 (fig.) Burma, elephant of, xii, 302; rivers of, xiv, 195-6; viper of, xii, 230 Burning Oils, viii, 209 Burns, of body tissues, x, 252; from X-rays, vii, 250, x, 254