INDEX 



[The figures'given refer to pages, not to sections.] 



Absorption, 50, 473, 479; by roots, 



88, 91. 



Accommodation, 517. 

 Adaptation, ~28 ; birds, 429 ; flowers, 



199-202; insects, 398; leaves, 



191 ; mammals, 437 ; roots, 159 ; 



seed-plants, 228; stems, 180, 184. 

 Adenoids, 503. 

 ^Esophagus, see esophagus. 

 Age, of animals, 17 ; plants, 20. 

 Air, breathed, 505. See oxygen. 

 Akene, 218. 

 Albuminoids, 463. 

 Alcohol, 269, 273, 275, 531, 539-553. 



See also yeast, and fermentation. 

 Algae, 245-252. 

 Amoeba, 307-311. 

 Amphibia, 65 ; 424-426. 

 Anaerobes, 286. 

 Anatomy, definition of, 21. See 



structure. . 

 Annuals, 177. 

 Angiosperms, 213. 

 Annelids, 347-353. 

 Anterior, 26. 

 Antitoxins, 293. 

 Ants, raising mushrooms, 266. 

 Appendages, of crayfish, 361. 

 Appendix, human, 470. 

 Aptera, 387. 



Aquarium, balanced, 128. 

 Arachnids, 376-380. 

 Arteries, 31 ; control of, 491. 

 Arthropods, 358-403. 

 Assimilation, 15, 109, 120, 304. See 



also nutrition, and metabolism. 



Bacteria, 276-298 ; in hygiene, 554- 



560. 

 Bacteriology, and health, 554-560. 



Barnacle, 374-376. 

 Bathing, 533, 534. 



Bean plant, classification, 121 ; physi- 

 ology, 85-120 ; reproduction, 76- 



85 ; structure, 67-85. 

 Bees, 386. 

 Biennial, 156, 177. 

 Biogenesis, 346. 

 Biology, definition of, 2 ; applied, 3 ; 



animal, 23-65; plant, 66-121; 



human, 457-560. 

 Birds, 428-436. 

 Bladder-worm, 342. 

 Blights, 260. 

 Blood, uses of, 50, 53-55 ; animals 



with, 353 ; human, 482. See also 



circulation. 

 Blood-cells, 312, 483. 

 Body-cavity, 330 ; frog, 29 ; human, 



458 ; worm, 350. 

 Body-wall, human, 458. 

 Bone, 42, 417, 457. 

 Botany, definition of, 2. 

 Brain, human, 513. 

 Branching, of stems, 165. 

 Bread making, 273, 274. 

 Breathing, animal, 15 ; chemical 



tests for, 16, 19; human, 504; 



hygiene, 526-528; plant, 19. See 



also respiration. 

 Bronchi, 503. 

 Bryophytes, 245. 

 Budding, 175, 227; corals, 337; 



hydra, 328 ; hydroids, 331 ; worm, 



349 (Fig. 112). 

 Buds, 71, 164. See also budding and 



reproduction. 

 Bulblets, 226. 

 Bulbs, 183. 

 Butterfly, 382. 



C 



Cactus, stem, 183. 

 Calorie, 495. 



575 



