Body Cells, ix, 13, 41-3, xi, 15, 17, 49; development of, ix, 43-8, 324-5, 332-3; different kinds, 13, 39, 42-3, 277, 329; living and nonliving, 12-17; maintenance and growth, 34-6, 38-9, 189, 278-84, 287-9; metabolism of (see Cell Metabolism); oxygen needs and supply, 182, 199, 253, 254, 260; power development in, 16, 17, 22, 36, 40; salt needs, 174; size of, 12; sugar and fat supplies, 289-91; supply and renewal system, 49-52, 193-5, 221-2, 262, 271; supporting tissue, 71-2; waste of, in starvation, 298; X-ray effects on, vii, 253 (see also Muscle Cells, Nerve Cells, Germ Cells, etc.) Body Fluids, ix, 50-1, 173-90; in connective tissues, 59; sugar in, 290, 291 (see also Blood, Tissue Fluids) Boë, Francis de la, x, 69, 70, xvi, 108 Boerhaave, Hermann, x, 76-7, 87, xvi, 112, 178 Boer War, kopjes in, xiv, 82 Boethius, xvi, 101 Bog Iron Ore, iii, 13, viii, 156 Bog Mosses, xiii, 68-9 Bogoslof Islands, xiv, 319 Bog Plants, xiii, 104, 381-2 Bogs, formed from filling lakes, xiv, 210-12 Bohemian Glass, viii, 281 Boiler Explosions, caused by electrolytic corrosion, vi, 64-6; due to scale, xiv, 147; violence, v, 140 Boilers, Steam, v, 139-42; boiling point of water in, viii, 303; hard water in, 151-2, 323, xiv, 147; heat loss, v, 155; pressure in, iv, 119, 170 Boiling, of foods, xv, 233; of liquids, iv, 167-75 Boiling Point, iv, 168; chemical composition and, viii, 298, 301; in various thermometers, i, 73, iv, 136, 137, 141, viii, 27; of various substances, iv, 173; pressure effects on, 168, 169-70, v, 354, viii, 303-5 Boils, causes of, ix, 186, 187, x, 195, 201, 311 Bolivia, Chilean control of, xiv, 306 Bologna, University of, xvi, 100; medical school of, x, 38 Bolometers, iv, 301, vii, 363; in corona studies, ii, 212, 225 Bombay Duck, xii, 163 Bombing Machines, v, 233 Bombs, aerial, v, 372-3 Bombs, volcanic, xiv, 323 Bond, Dr. A. R., author Mechanics, Vol. v Bonds (chemistry), defined, viii, 374 Bone Black, viii, 47 Bone Fertilizers, viii, 153, 280, 343 Bones, of body, ix, 59, 71; cartilage beginnings of, 58; condition of, in infants, 345-6; food needed for, 33; formation, structure, and growth, 54-7, 58; inflammations of, x, 224; lime salts in, ix, 57; red marrow of, 183; used in hearing, iv, 204; X-ray pictures of, iv, 320, vii, 253-4, 255 Bonneville, Lake, iii, 153 Books, ancient making of, xv, 178-9; printing and binding of, v, 306 Book Scorpions, xii, 90 Boomerangs, xv, 194, 208; principle of, iv, 42 Bora Winds, i, 133, 368 Boracic Acid, viii, 89, 90, 372 Borates, preparation, viii, 117; test, 290 Borax, composition, viii, 141; deposits, 89, 90, 197, 275; uses, 89, 141, 146, 333, 372 Boredom, in work, xi, 275-6, 277-8, 280