INDEX 



Heavy figures indicate pages on which illustrations occur. 



Acacia, flower of, 157. 



Adiantum, 90. 



Agave, 208. 



Agriculture, 296. 



Air-roots, 268j_269. 



Aleurone grains, 177. 



Alfalfa, 364. 



Alga?, 8. 



Alternation of generations, 75. 



Althaea, flower of, 137. 



Angiosperms, 115, 129. 



Annual rings, 239. 



Annuals, 238. 



Annular vessels, 238. 



Anther, 123, 134, 135, 136. 



Antheridium, 27 ; of ferns, 99 ; 



of liverworts, 74 ; of mosses, 



80. 



Anthoceros, 83, 84, 85. 

 Apple, 390; bitter rot of, 443, 



444 ; canker on, tree, 442 ; 



flower of, 156; fruit of, 149; 



spot disease of, leaf, 434. 

 Apricot, 393. 

 Archegonium, of ferns, 98 ; of 



liverworts, 75 ; of mosses, 80. 

 Ascomycetes, 57. 

 Aspen, tree fungus on, 448. 

 Aspidium, 92. 

 Assimilation, 38, 176. 

 Aster, 4(39, 490. 

 Autumn colors, 214. 

 Axil, 226. 



B 



Bacteria, 43, 44. 

 Bacteriology, 44. 



Bark, 240. 



Barley, 357, 358. 



Barley-production, map showing 

 states of greatest, 357. 



Basidiomycetes, 58. 



Bast, 237. 



Bean, 167, 386; germination of, 

 177, 178, 179, 180, 181, 323, 

 324 ; section of, 319 ; seed-dis- 

 charge, 168. 



Beet, 374; spot disease of, leaf, 

 438. 



Beggar-ticks, 173. 



Bilabiate, 134. 



Biology, 1. 



Bitter rot, 442. 



Black knot, 445. 



Bluebell, 133. 



Blue-green Algae, 31. 



Brown Algae, 31. 



Brown rot, 441. 



Bryophytes, 7, 66, 114. 



Bud, 225. 



Budding, 332. 



Bulb, 250, 377. 



Bulblet, 250. 



Burdock, 174. 



Cabbage, 373, 378, 379; black 



rot of, 447. 

 Cactus, 209. 

 Cactus deserts, 283. 

 Calyx, 131. 

 Cambium, 239. 

 Cankers, 442. 

 Canteloupe, 385. 

 Capillary movement, 314. 



455 



