Index 



649 



bacteria Cont'd 

 beneficial, 59, 378, 441, 443-444, 



529 

 conditions favorable to growth, 



440, 442-443, 445 

 control of, 445-448, 449, 465-466, 



541 



cultures, 441, 541, 621, (442) 

 fermentation, 372, 378-379, 396, 



445, 530, 562, 625 

 forms of, 316, 379, 439-445, 448, 



460 



harmful, 370, 393, 404, 411, 441, 



445, 448, 453-454, 457, 551, (460) 



nitrogen-fixing, 36, 301, 443-444, 



529, 633, (444) 

 protection against, 370, 445-448, 



469 



reproduction, 440 

 size, 439 



where found, 379, 441-444, (444) 

 balanced aquarium, 535-537, 617, 



(536) 



balanced diet, 364-366 

 balanced terrarium, 537, 617 

 balanced world, 535-545 

 ballast, 276, 279 

 balloon, 121, 278-279, 617, (280) 

 bandaging, 479, 482, (483) 

 barograph, 138-139, 617 

 barometer, 39-40, 617, (40) 



aneroid, 138-139, 616, (139) 

 battery, 209-210, 236, 617, (235) 

 storage, 210-211, 265, 276, 641, 



(211) 



beam of light, 181, 185, 187, 617 

 bean seed, 505-506, 508, (505) 

 bees, 540, (540) 

 Bell, Alexander Graham, 221, 549, 



565-566, 575, (565) 

 bell, electric, 217-218, (218) 

 belt of equatorial calms, 132, 133, 



617, (133) 



Bessemer, Sir H., 575 

 beverage-producing plants, 501, 



530 



beverages, 377-378, 530 

 biceps, 330-331, 617, (330) 

 bichloride of mercury, 429, 617 

 bicuspid teeth, 399, 617 

 Big Creek, 68, 225 

 Big Dipper, 161-162, (161) 



bile, 402-403, 405, 426, 617 

 biplane, 282, 617, (281, 286) 

 birds, 153, 324, 538-539 

 bituminous coal, 85, 91, 93, 617 

 Black, J., 575 



bladder, 403, 425-426, (425) 

 blade of leaf, 497, 617 

 blast furnace, 297, 617 

 bleeding, 417-418, 482, 483, 484 

 block and tackle, 247-248, 617, 



(247) 

 blood, 393, 394, 480, 482-484, 542, 



617 



changes in composition of, 417 

 circulation, 328, 335, 339-340, 341, 

 416-423, (420) 



importance of, 339, 416, 422 

 clotting of, 417-418, 424, 483, 620 

 composition of, 341, 416-417 

 temperature of, 418 

 blood poisoning, 482 

 boards of health, 360, 468, 470-471, 



473, 474-476 

 boats, 270-276, 548, 590, 603, 605, 



607-608, (271, 272, 274, 275) 

 body (see human body) 

 boiler, 109, 111, 260 

 boiling, 370-371 

 boiling point, 86-87, 89 

 bones, 330, 355, 358, 364, 472, 481- 



482, (331 t 340) 

 borax, 62 

 botany, 6, 618 

 brain, 424, 430, 431-433, 436, 618, 



(432) 



brakes, 41, 262, 265 

 bread, in relation to yeast, 372, 444 

 breast wheel, 72, 73, 618, (73) 

 breathing, 32, 35, 320, 332, 339-353, 



493, 618, (350) 

 adaptation, 538 

 proper methods of, 37, 347 

 breezes, land and sea, 47-48, 138 

 Bremen, 608 

 brick pavements, 257 

 bricks, 302-303, 618 

 bridges, 257-258, (257, 258) 

 brine, 62 

 brittleness, 15 

 broadcasting, 234-235, 237, 238, 588- 



590, (234, 237) 

 broiling, 370, 618 



