432 



INDEX 



Apoplexy, 175. 



Appendages, of frog and man, 109. 



Appendix, vermiform, 159. 



Appetite, for foods, 128, 130. 



Apple, 41, 329. 



Aptera, 242. 



Aquarium, balanced, 102, 103, 348. 



Arachnida, 242. 



Arbor Day, 321. 



Argj-rol, 214. 



Arteries, 169, 172, 173; 



hardening of, 174. 

 Arteriosclerosis, 174. 

 Arthropoda, classified, 241, 242. 

 Artificial respiration, 183. 

 Artificial selection, 384. 

 Ascaris, 288, 289. 

 Asexual reproduction, defined, 222 ; 



in animals, 228 ; 



in plants, 222, 223. 

 Ashes, disposal of, 306, 307. 

 Assimilation, 15, 93. 

 Astigmatism, 213. 



Atwater, authority on foods, 132, 139. 

 Auditory nerve, 205. 

 Audubon, cited, 375. 

 Auricle, 169, 170, 171. 

 Autonomic nervous system, 200, 201. 

 Aves, 243. 

 Axon, 198. 



Bacillus, 96, 256. 

 Bacteria, 256-258; 



affected by light and air, 258 ; 



and disease, 3, 253, 260-276; 



as simple plants, 96 ; 



carried by dust, 297 ; 



cause decay, 339, 340 ; 



cause fermentation, 340 ; 



cause skin infection, 113; 



control of, in food, 343-345 ; 



disinfection, 259; 



for study, 254, 255, 256; 



in breadmaking, 339 ; 



in fluids, 257 ; 



in food, 299; 



in hay infusion, 97 ; 



in milk, 259, 300-303, 340; 



in water supply, 303 ; 



nitrogen-fixing, 104, 341; 



Bacteria, reproduction, 256; 



size and form, 256 ; 



sterilization, 258; 



useful, 3, 340, 341 ; 



where found, 255, 256-257; 



work of Pasteur, 408, 409. 

 Bacteriology, defined, 3. 

 Balanced aquarium, 102, 103, 348. 

 Balancing function of ear, 196-197, 



204. 

 Banting, Dr., work on insulin, 168. 

 Bark, described, 87, 88, 89. 

 Barley, 328. 

 Barrier, natural, 20, 21. 

 Basal metabolism, 132-133. 

 Bast fibers, described, 87, 89 ; 



used by man, 330, 331. 

 Beans, germination of, 55-58, 56 ; 



growth, 51-58; 



pod and seed, 52 ; 



position of leaves, 194 ; 



value as food, 124. 

 Bedbug, 27, 283, 286. 

 Bedroom, care of, 293 ; 



ventilation, 184-185. 

 Bee, 25, 26 ; 



adaptations, 33, 34; 



life, 351. 

 Beehive, 351. 



Beetles, 27, 28, 357, 362, 364. 

 Beets, 324, 325. 

 Benedict's test, 60. 

 Benzoic acid, 345. 

 Beriberi, deficiency disease, 123. 

 Beverages, 329. 



Bichloride of mercury, 259, 260. 

 Bile, 156. 

 Biology, study of, 1 ; 



relation to society, 6. 

 Birds, 247-248; 



as food, 353 ; 



bills and feet, 247 ; 



brain, 200 ; 



classification of, 248 ; 



conservation of, 375-378; 



eat insects, 359 ; 



eat weed seeds, 360 ; 



migrations, 376, 377 ; 



reproduction, 231, 232; 



useful and harmful, 360. 



