420 



INDEX 



Aorta, 320. 

 Apoplexj% 328. 

 Appendages of the fisii, 233. 

 Appendicular skeleton, 268. 

 Appendix, 309. 

 Apples, 56, 124. 

 Aqueous humor, 361. 

 Arachnida, 185. 

 Arteries, 318 ; 



structure of, 323. 

 Arthropods, 185. 

 Artificial, cross- pollination, 46; 



propagation of fishes, 240 ; 



respiration, 340 ; 



selection, 253. 

 Asexual reproduction, 174. 

 Assimilation in plants, 103. 

 Attention, effect of alcohol, 364. 

 Audubon, 211. 

 Auricle of human heart, 319; 



of fish heart, 236. 

 Automatic activity, 348, 354. 

 Axial skeleton, 268. 



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 ; 



4 



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