Balloons, iv, 107-8, v, 219-30; aerological uses and kinds, i, 18, 19, 20-2, 89, xvi, 177; dirigible (see Dirigible Balloons), heights attained, i, 18, 22, 303, v, 225; hydrogen in, iv, 108, viii, 33; sounds heard, i, 188; why they rise, 286, v, 221-2 Baltic Provinces, coasts of, xiv, 247 Baltic Racial Group, xvi, 48-9 Baltic Sea, development of trade of, xiv, 308; formation of, 287; green color, xvi, 147; salt in, viii, 139, xiv, 296 Baltimore, harbor of, xiv, 268 Bamboo, in grass family, xiii, 179, 181; rapid growth, 358; stem, 26, 183; tropical wood, xiv, 383 Banana, xiii, 216-18; calories in, ix, 299; flavor and odor, to what due, viii, 221; food value, 365, x, 266-8; in tropical forests, xiv, 368 Banana Oil, viii, 214, 221, 251 Bandai-san, eruption of, xiv, 324 Banks, oceanic, xiv, 286 Banyan Tree, xiii, 16 (illus.), 21 Bar, pressure unit, i, 70, 367 Barbados, overpopulation of, xiv, 282 Barbed Fruits, xiii, 58 Barbers, as surgeons, x, 35, 41, 54, 105, xvi, 181 Barberry Bush, xiii, 128-30 Barisal Guns, i, 195, 367 Barite, iii, 323; gangue mineral, viii, 199 Barium, viii, 148; affinity strength, 128; atomic weight and symbol, 383; flame color, 301; fluorescence of, vii, 254; specific gravity, viii, 384; test for, 287-89 Barium Chloride, viii, 290, 301 Bark Lice, xii, 112 Barker, Dr., quoted, x, 375-6 Barley, composition and value, viii, 364; malt from, 249; ripening time, xiv, 365; source, 382; vitamines in, x, 262 Bar Magnets, iv, 242-3, 250, vi, 30-4 Barnacles, xii, 82, 84-5 Barns, electricity for, vii, 227-8; lightning rods on, i, 156 Barocyclonometer, i, 280, 367 Barographs, i, 71-2, 367 Barometers, i, 70-2, 367, iv, 119-24; Torricelli's development of, i, 68, iv, 29, 30, 114, xvi, 109, 177 Barometer Wells, i, 354, 367 Barometric Gradient, i, 126, 373 Barometric Pressure (see Atmospheric Pressure) Barometric Tendency, i, 71-2, 367 Barotaxis, xi, 53, 61 Barramunda, xii, 154, 165-6 Barrel Gears, v, 27-8 Barrier Reefs, xii, 40-1, xiv, 263 Barton, Prof. W. M., author Medicine, Volume x Bars, vibration rate of, iv, 223-4 Basal Metabolism (see Basic Metabolism) Basaltic Lava, defined, iii, 377; in Grand Canyon, 177; jointing in, xiv, 129-30; soils from, iii, 28 Basalt Rock, magnetized by lightning, i, 152-3 Base, Bases (chemistry), viii, 374; defined by ionization theory, 122; electrolytes, 125; formation and character, 20, 39, 115, 117-18; ionization in solution, 119-25, 300-1; litmus effect, 114; production, 276 Baseball, pitching of curves, iv, 67-9 Baseball Games, crowd psychology at, xi, 327; value to spectators, 139-40 Baseball Players, sensory type, xi, 156