Bacillus, 142. Bacteria, 134; and fermentation, 150; cause decay, 149; cause disease, 151; effect on food, 144; growth of, 145; isolating a pure culture, 142; nitrogen fixing, 80, |81|, 151, |152|; of decay, 144; relation to man, 16; size and form, 142, |143|; useful, 150; where found, 139, |141|. Bacteriology, 16. Bad posture, |270|. Balanced, aquarium, 159, |160|; diet, 285. Barbels of fish, 234. Barberry embryo, |103|. Bark, use of, 98. Barrier, natural, |25|. Bast, 97. Beans, as food, 62. Beans, peas, 55. Beans, seedlings, |63|. Bedroom, care of, 374. Bee, adaptations, 36; head of, |38|; mouth parts, 38. Beer and wine making, 137. Benedict's test, 68. Benzoic acid, 148. Beverages and condiments, 124. Biceps, |269|. Bichloride of mercury, 148. Bile, functions of, 306, 307. Biology, definition, 15; relation to society, 18. Birds, 189; as food, 202; classification, 191; development, 246; eat insects, 209; eat weed seeds, 210; embryo, |246|, 247. Bismuth, 304. Bison, |192|. Black Death, 227. Blade of leaf, 85. Blastula, 177. Blood, amount and distribution, 318; changes in lungs, 330; circulation of man, 318; clotting, 314; composition, |314|; effect of alcohol, 327; function, 313; plates, 315; poisoning, 156; temperature, 318; vessel of skin, |344|. Blubber, 205. Blue crab, |199|. Board of health, functions, 389. Body, a machine, 348; cavity, 270; heat and alcohol, 345; of fish, 232. Bony fish, |187|. Boracic acid, 148. Borax, 148. Brain, of fish, 237; of man, 351. Bread, making, 139; mold, |133|. Bream, |233|. Breathing, |333|; and tight clothing, 339; hygienic habits, 338; in leaf, |93|; of fish, 234; of frog, 242; of vertebrates, 232; rate of, 334. Breeding of animals, 259. Bright's disease, 346. Bronchi, 330. Bronchial tubes, 330. Bruises, 345. Bryophytes, 176. Bubonic plague, 227. Budding, 255, |256|. Bumblebees, 37. Burbank, Luther, 406. Burns, treatment of, 345. Butter and eggs, 38, |39|.