INDEX 



433 



Bison, 248. 



"Black Hole of Calcutta," 183. 



Bladder, offish, 245; 



urinary, 188. 

 Blastula, 227. 

 Blood, changes in the lungs, 178 ; 



circulation of, 169-174, 171 ; 



clotting of, 121, 164-165 ; 



composition of, 11, 162-168; 



four types of, 166 ; 



pressure, 173, 174; 



transfusion, 166. 

 Blood plates, 165. 

 Blood pressure, 173, 174. 

 Board of health, 268, 272, 308-311. 

 Bobolink, 360, 377. 

 Body, a machine, 110, 111, 208; 



cavity, 116; 



composition of, 10 ; 



temperature, 189; 



value of understanding, 112. 

 Boils, 276. 



Boll weevil, 362, 363. 

 Bones, human, 114. 

 Borax, preservative, 345. 

 Bordeaux mixture, 337. 

 Boveri, biologist, 413. 

 Bracket fungus, 335. 

 Brain, fatigue, 212; 



of animals, 200 ; 



of man, 199. 

 Bread, value as food, 120, 124. 

 Bread making, 339. 

 Breathing, 180, 181; 



hygienic habits, 181 ; 



of birds, 247; 



of frogs, 110, 111; 



of leaves, 85-86, 

 Brittle star, 241. 

 Broadhurst, Dr., tests of dishwashing, 



295. 

 Bronchi, 178. 

 Bronchial tubes, 178. 

 Bruises, treatment of, 175. 

 Bryophytes, 236. 



Bubonic plague, 266, 285, 286, 287. 

 Budding, propagation by, 221 ; 



reproduction by, 223 ; 



reproduction of animals, 228. 

 Buffalo, or bison, 248, 377. 



Bugs, 27, 363, 364. 

 Bumblebee, 33, 35. 

 Burbank, Luther, 390, 414. 

 Bureau of Entomology, 365. 

 Burns, 113. 



Butter and eggs, 34, 35. 

 Butterflies, 26; 



life history, 28, 29, 30, 229 ; 



pollination by, 38. 



Cabbage, 324. 

 Cabbage butterfly, 229. 

 Caffein, 139. 

 Calcium, as a food, 121. 

 Calorie, defined, 119; 



food requirement, 132-134. 

 Calorimeter, 119. 

 Calyx, defined, 31, 32. 

 Cambium layer, 88, 90. 

 Camera, compared with eye, 205, 206. 

 Canning, 343, 344. 

 Capillaries, 169, 172, 173. 

 Capillarity, explained, 65. 

 Carbohydrates, amount needed daily, 

 132; 



described, 53, 119; 



foods containing, 124. 

 Carbolic acid, 260. 

 Carbon, 10-11. 

 Carbon cycle, 103. 

 Carbon dioxide, in respiration, 179 ; 



in starch making, 82 ; 



test for, 11. 

 Carnivora, 249. 

 Carrell, investigator, 411. 

 Carriers, of disease, 264, 265, 301 ; 



insects, 279, 281, 283, 284, 285 ; 



rats, 286. 

 Carrot, 325. 

 Catarrh, 181. 

 Caterpillar, 29. 

 Cats, damage from, 366, 376. 

 Cattle, 353. 

 Celery, 324. 

 Cells, 44; 



division of, 47, 48, 99, 100, 219, 220 ; 



functions, in one-celled animals, 

 100; 



plant and animal contrasted, 46, 

 95-96,97; 



