438 



INDEX 



Asymmetry in oyster, 268. 

 Atwater's experiments, 332. 

 Auricle, 370. 



Bacillus, 176. 



Bacteria, and fermentation, 177 ; 



carried by fly, 260, 261, 420; 



cause decay, 177 ; 



cause disease, 178 ; 



from human mouth, 179 ; 



in impure water, 433 ; 



in milk, 180 ; 



in schoolroom, 387 ; 



in streets, 419 ; 



nitrogen-fixing, 178; 



size and form, 175 ; 



their relation to man, 14. 

 Bacteriology, defined, 14. 

 Bark, use of, 104. 

 Balanced aquarium, 185. 

 Balancing in birds, 300. 

 Bean, 65. 



Bean seedlings, 78. 

 Beans, as food, 68. 

 Beaver, 314. 

 Bees, 40, 43, 253, 254. 

 Beer making, 172. 

 Beetle, characters of, 242. 

 Benedict's test, 71. 

 Berry, 53, 63. 

 Bile, functions of, 360. 

 Biology, civic, 418 ; 



reasons for study of, 13. 

 Bird, body of, 297. 

 Birds, care of young, 304 ; x 



classification of, 308, 31 i ; 



distribution of, 307 ; 



economic importance of, 304 ; 



extermination of, 306 ; 



feathers of, 298 ; 



feet of, 299 ; 



flight of, 298 ; 



migrations of, 307 ; 



nesting habits of, 303, 304 ; 



perching, 309 ; 



perching in, 300. 

 Bison, 315. 

 Bladder, urinary, 391. 

 Bladderwort, 130. 

 Blastula, 200. 



Blood, amount of, 369 ; 



and its circulation, 366 ; 



changes in, in body, 393 ; 



changes in, in lungs, 383, 386 ; 



clotting of, 367 ; 



course of, 372 ; 



distribution of, 369 ; 



exchange in, 376 ; 



function of, 366 ; 



temperature of, 369 ; 



vessels, congestion in, 394 ; 



wastes of, to kidney, 391. 

 Bodily heat, affected by alcohol, 395 ; 



in cold-blooded animals, 393 ; 



regulation of, 392. 

 Body, daily fuel needs of, 337 ; 



normal heat output of, 339. 

 Box elder twigs, sections of, 103. 

 Brain, functions of parts, 403 ; 



of man, 401. 

 Bread mold, 149 ; 



growth of, 150. 

 Breathing, and lacing, 388 ; 



hygienic habits of, 388 ; 



mechanics of, 384 ; 



movements in, 383, 384 ; 



rate of, 384. 

 Bronchi, 382. 



Bruises, treatment of, 378, 394. 

 Bryophytes, 157. 

 Bud, structure of, 98, 99. 

 Budding, 110. 

 Buds, factors in opening of, 99 ; 



position of, 100. 

 Bugs, 242, 243. 

 Bumblebee, 40, 41, 42, 253. 

 Burns, treatment of, 394. 

 Butterfly, 237 ; 



compared with moth, 238. 



Calorie, defined, 333. 



Calorimeter, respiration, 332. 



Calyx, 34. 



Cambium layer, use of, 104, 111. 



Canal, semicircular, 408. 



Capillary circulation in frog's foot, 



373. 



Carapace, 222. 

 Carbohydrates, 24, 331. 

 Carbon, properties of, 21. 



