INDEX 



A 



abalone, ornamental use of, 471. 



abdomen, of crayfish, 179; of grass- 

 hopper, 197; of butterfly, 206; of 

 honey bee, 213. 



absorption (root), 53, 58; selective, 

 61; in an animal, 375. 



acerata, 173; use as insect destroyers, 

 472, 473; mites and ticks, 473. 



acetic acid, 461. 



Agramonte, Dr., see yellow fever. 



agriculture, close association with 

 biology, 493. 



air bladder, of fish, 245. 



alcohol, plant product, 461; wood, 

 462; narcotic, beverages containing, 

 514; physical effects of use of, SIS- 

 SIS; not a food, 516; and disease, 

 519; not a medicine, 520; and 

 efficiency, 521. 



alga?, 127. 



alimentary canal, 363, 364. 



amoeba, 146-148. 



amphibia, characteristics of, 252; use- 

 ful as insect destroyers, 481. 



amylopsin, 374. 



animals, general uses of, 467; eco- 

 nomic value of, 468; husbandry of, 

 489. 



antennae, of crayfish, 182; of grass- 

 hopper, 194. 



anthers, 109, 113. 



anthrax, 137. 



anthropology, 333. 



antiseptics, 140. 



antitoxins, 138, 139. 



appendix, 322. 



apple, structure of, 120; seed dis- 

 persal of, 121. 



arrowhead from the Cave of Perigord, 



France, 334. 

 arteries, 398. 

 arthropods, 158; characteristics, 



classes, 172; classification, 173-177, 



235. 



ash, 121. 



assimilation, 5, 375, 377. 

 astigmatism, 422. 

 Atwater, quoted on alcohol, 515. 

 auditory canal, 417. 

 auricle, 397. 



B 



baboon, 318. 



bacteria, 4; shapes, 133; types, 134; 

 methods of study of, 135, 136; 

 useful forms of, 136; harmful, 137; 

 defences against, 137-141; rapidity 

 of reproduction, 327; useful, 447; 

 nitrifying, 487; good and bad ac- 

 tivities on the farm, 493. 



bacteriology, 134; development of, 

 141. 



barley, 449. 



barnacles, 472. 



bass-wood, seed, 122. 



bast, root, 51, 56; stem, 77; fibers, 

 78; tubes, 78; see cotton, flax, 

 jute and hemp. 



bark, structure of, 76. 



baths, 431. 



beak, of bird, 289. 



bean, structure of, 34, 120. 



bee, agent in pollenation, 110; honey, 

 structure of , 2 1 1-2 13 ; queen, drone, 

 worker, 213. 



beetles, beneficial and harmful, 476. 



Beri-beri, 356. 



549 



