INDEX 



Abaca, 140. 



Abscission, 100, 260. 



Absorption, 191; and transpiration, 90. 



Acacia, 538. 



Accumulation, of food, 163, 166, 202; of 

 water, 79, 162. 



Acidity of soils, 218, 220. 



Acre, food products from an, 46. 



Aerial roots, no, 187. 



Agave, 80, 169, 369, 529. 



Agriculture, 147. 



Akene, 253, 522. 



Alcohol, 410. 



Alder, 237. 



Aleurone, 59. 



Alfalfa, 359, 397- 



Alga:, 441; blue-green, 441; brown, 457; 

 classification of, 441 ; green, 445 ; impor- 

 tance of, 455, 4(52, 464; periodicity of, 

 456; red, 463; reproduction in, 453. 



Alkali, 221. 



Alkaloids, 58. 



Alternation of generations, 486. 



Amanita, 420. 



Amaryllis, 115; family, 530. 



Ammophila, in. 



Amylase, 164. 



Angiosperms, 259, 517; divisions of, 522; 

 families of, 524; life history, 518, 521, 



Animals, 222. 



Annual rings, 137, 150, 152. 



Annuals, 143; as weeds, 376. 



Anther, 241. 



Antitoxins, 391. 



Apple, rust of, 419; seedlings of, 207. 



Aroids, 527. 



Ascomycetes, 409. 



x\ssimilation, 61. 



Associations, plant, 305. 



Autophyte, 378. 



Autumn coloration, 54. 



Avocado, 257. 



Axil, 116. 



BaciUariacece, 444. 



Bacteria, 384; and disease, 391; 



legumes, 397 ; and sanitation, 390 ; 



soils, 393, 396; and nitrogen cycle, 



control of, 394. 

 Bamboo, 139, 151; thicket, 525. 

 Banana, 140, 229. 

 Basidiomycetes, 414. 



and 

 and 

 396; 



velvet, 275. 



basis of, 277. 

 economic importance of, 



Bast, 136. 



Bean, flower of, 251 ; 

 Beech family, 533. 

 Beets, sugar, 351. 

 Bennettitales, 500. 

 Berry, 253. 

 Biennials, 144. 

 Blackberry, 254. 

 Black knot, 433. 

 Bloom, 76. 

 Blue-green algae, 441. 

 Blue mold, 411. 

 Boston ivy, 108, no. 

 Box elder, 207. 

 Bracts, 236. 

 Bread-making, 410. 

 Breeding, plant, 272; 

 Bromeliacece, 531 • 

 Brown algae, 457 



462. 

 Brown rot, 435. 

 Bryophyllum, 225. 

 Bryophytes, 465. 

 Budding, 157, 228. 

 Bud mutations, 285. 

 Buds, 116; and plant form, 119. 

 Bulbs, 114. 

 Bundles, 31; dicot, 131; leaf, 31 



139; root, 183; stem, 131. 

 Burdock, 106. 

 Buttercup family, 533. 



Cabbage, 281. 



Cactus, 169, 171; family, 538, 547. 



Calcium, 216, 217. 



Calcium oxalate, cr>'stals of, 59, 139, 217. 



Callus, 228. 



Calorie, 46. 



Calyx, 238. 



Cambium, 134, 137; and grafting, 15S; 



secondary, 141, 150. 

 Cantharellus. 413. 



Carbohydrates, 34; synthesis of, 32, 40. 

 Carbon cycle, 386. 

 Carbon dioxide, effects of, 197. 

 Carboniferous plants, 497. 

 Carotin, 52. 

 Carpels, 239. 

 Carrot, 144; family, 540. 

 Catalyst, 60. 

 Catkin, 232. 

 Cauliflower, 281. 



monocot, 



553 



