556 



INDEX 



Anxiety, 166 



Apix?tite, 137 



Appreciation, 186 



Archegoniu, 329 



Aristotle, 420 



Artificial selection, 418 



Ascent of sap, 57 



Asexual Itepro<luction, 316; essen- 

 tials of, 322; in algse, 317; re- 

 sults of, 2*J5 



Ash constituents, 50 



Association, 186, 531, 537; nature 

 of, 193 



Associated memory, 163 



Assortment, independent, 363; 

 random, 313 



Australian race of man, 503; realm, 

 479 



Auto-intoxication, 217 



Autolysis, 260, 266 



Awareness, 165, 186 



/Vzotobacter, 275 



Bach family, 520 



Back cross, 367; of linked charac- 

 ters, 369; of independent charac- 

 ters, 367 



Bacteria, 219 (fig.); denitrifying, 

 273, 276; free-living soil, 275; 

 nitrate, 274; bacteria, nitrify- 

 ing, 273; nitrite, 273; sulphur, 

 271,277; symbiotic, 275; tuber- 

 cule, 276 



Bacterial infection, 212; zymase, 

 263 



Bark, 56 



Barriers, 451; biological, 456; in- 

 tjingible, 454, 475; tangible, 

 4.53, 474 



Uiwir mctalxilism, 74; effect on of 

 adrenalin, 175, 177 



]U'v colonics, 194 



lieenvort malt sugar, 262 



I^'havior, animal, 542; human, 

 532 



Beneficial insects, 236 



Betterment, racial, 553 



Biolog>-, 3; general, 5; sanitary, 4 



Birds, migration of, 162 



Birth rate, human, 524 



I^lanching, 41 



Blasttila, 302 (fig.) 



Bleeding, 61 



Blood, 88; ccUs, 84, 229 



Body cells, 309; surface, 84; 



layers, 302 

 Boils, 222 

 Botany, 4 



Bottom dejxwits, 487 

 liotuUsm, 217 

 Brachvdactvlv, 507 (fig.) 

 Brain, 110, 158 

 Brantiy, jackass, 263 

 Breathing, 133 

 Breeding, animal, 397; cotton, 393; 



plant, 4, 390 

 Breecls, 418; improved, 403 

 British men, 520 

 Budding, 293 (fig.) 

 Bud.s, 117 

 Bumble-l)ee, 194; mimicked by 



flies, 444 (fig.) 

 Burbank, Luther 391 

 Burns, 189 

 Butter fat, 264 



Cactus plants, adaptations among, 

 433, 466 (fig.) 



Calcium, 38 



California children, 524 



Camels, evolution of, 410 



(dancer, 212 



Cane sugar, 96 



Carlx)hydrates, 77, 92; fermenta- 

 tion of, 261 



Carlx)n, 38; cycle, 277 



Carlwn dioxid*, 38, 40, 81, 98 



Carnivorous plants, 45, 435 



Carriers of di.sease, 221 



Catalyzers, 66 



Catching cold, 224 



Caucasian race, 510 



Causes of di.sease, 204 



Cell, conditions favoring activity 

 of, 83; division of, 15, 19, 283 

 (fig.); growth of, 283; sap, 61; 

 structure of, 20; .surface, 84; 

 theorv, 15; tvpical, 20 (fig.); 

 wall, 20 (fig.) 



Cells, 13; are bags of water, 62; 

 blood, 84; Ixxly 30 (fig.), 309; 

 discovery of, 13; germ, 297, 

 309, 324; guard, 58; muscle, 

 122; numlx;r of in man, 84; 

 vsize of, 13 



Cellulase, 67 



Cellulose, 20, 44, 266 



Chalk. 488 



