INDEX 



Absolute achievement, 529 



Absorbing Organs, leaves as, 59 



Absorption, 96; of food materials, 

 38 



Accessories, dietary, 50 



Accessory ejne structures, 145 (fig.)> 

 respiratory organs, 100; sex 

 organs, 298 



Accommodation, 145 



Acetic fermentation, 264 



Achievement, absolute, 529; rela- 

 tive, 529 



Acid, amino (see amino acids); 

 fatty, 267; lactic, 264; nitrous, 

 273; uric, 261 



Acquired characters, 357 



Activity, nervous, 76; reflex, 161; 

 volitional, 162 



Acts, voluntary, 162 



Adaptation, 431; adjustment, in 

 animals, 439; convergent among 

 animals, 431; convergent among 

 plants, 432; food-securing, 434; 

 for rivalry, 435; for self-defense, 

 436 



Adjustment, adaptations in ani- 

 mals, 439; gradual, necessity 

 for, 169; of leaves, 114 (fig.); 

 necessity for, 109; of organisms, 

 6; plant, 439; of reproduction, 

 115; of roots, 110; of stems, 112 



Adjustors, 124, 148; chemical, 170; 

 mechanism of, 148 



Adrenal gland, 175; hormone of, 

 175 



Adrenalin, 175 



Aerobes, 267 



Agriculture, 536 



Air, composition of, 98; contami- 

 nation, 235; dry and moist, 205; 

 polluted, 205 



Albumoses, 268 



Alcohol, 44, 263; ilUcit manufac- 

 ture of, 263 



Alcoholic fermentation, 262 



Alcoholism, 521 



Algae, 116; bacteria symbiotic 

 with, 275 



AHmentary tract, 92 (fig.); move- 

 ments of, 96 



Alpine type of man, 502 



Alternation of generations, 327; in 

 ferns, 330; in higher plants, 342 

 (fig.), 345 (fig.) 



America, man in, 502 



Amino acids, 46, 77, 78, 95, 267; 

 syntheses of proteins from, 47 



Ammonia, 266 



Ammonium carbonate, 273 



Amoeba, 21 (fig.), 25 (fig.), 119, 

 226 (fig.) 



Amoeboid movement, 22, 119, 122 



Amylase, 67, 263 



Amylobacter, 275 



Amyloplasts, 64 



Anaerobes, 267 



Analogy, 414 (fig.) 



Anaphase, 288 (fig.) 



Anatomy, comparative, 414 



Anemia, 189 



Anger, 166 



Animal, behavior, 541; breeding, 

 395; kingdom, 411; parasites, 

 199, 208; wastes, 272 



Animals, 110; adjustment adap- 

 tations in, 439; chemical corre- 

 lation in, 171; cold-blooded, 79; 

 colors of, 440; convergent adap- 

 tations in, 431; distribution of 

 land, 473; food requirements of, 

 110; migrations of, 481; of 

 oceanic islands, 476; of the sea 

 floor, 490; reproduction among, 

 292; some pelagic many-celled, 

 488; warm-blooded, 79 



Annual production of food, 37; 

 value of food, 37 



Antheridia, 328 



Anthers, 337 



Anti-bodies, 231 



Anti-toxin, 232 



Ants, 195 



655 



