INDEX 



Figures in heavy type indicate pages on which illustrations occur. 



Abnormalities, 196. 



Abrus, 363. 



Absciss-layer, 120. 



Absorption, 262 ; affected by tem- 

 perature, 258 ; by roots, 224. 



Acetabularia, 432. 



Acid Soil Habitats, 573. 



Adaptation,- 12. 



Adder's Tongue, 494. 



Adherent Vines, 575. 



Adhesive, seeds, 362 ; Traps, 579. 



jEchmea, 185, 576. 



^Ecidia, 466. 



^Ecidium, 199. 



Aeration system, 132, 266. 



Aerenchyma, 252, 266. 



Aerenchymous Herbs, 572. 



Aerial, Habitats, 564 ; roots, 254, 256. 



Aerobic, 403. 



Aerophytes, 564 ; characteristics, 

 565. 



Aerotropism, 232, 248. 



^Estivation, 329. 



JZthaliwn, 414. 



After-ripening, 379. 



Agar-agar, 444. 



Agaricinece, 471. 



Agaricus campestris, 469. 



Agave americana, 536. 



Age, of Trees, 114. 



Agriculture, 4. 



Air, in soils, 240; passages, 19, 29; 

 system, 33. 



Akene, 348, 349. 



Albugo Candida, 436. 



Alcohol, 459; production, 172; 

 source, 101. 



Aldrovanda, 547. 



Algae, 12; classes of, 399; Red, 

 306; relationship to I'm 



Algal Fungi, 434. 



Alkaloids, 109. . 



Alpine Meadows, 585. 



Alternating Habitats, 567. 



Alternation of generations, 301, 446 

 479, 507, 509 ; diagram, 508. 



Amanita vernus,4JI0, 471. 



Amaryllidaceai, 536. 



Anabcena, 500, 577. 



Anaerobic, 403. 



Anatomy, 3, 8. 



Anchorage by roots, 231. 



Angiosperma, described, 524 ; life 

 cycle, 525. 



Animals, classification of, 395 ; nu- 

 trition, 86; seed carriage, 361. 



Annual, 114 ; Herbs, 568 ; rings, 124 ; 

 Succulents, 573. 



Annulus, 489, 495. 



Anoxyscope, 167, 168. 



Anther, 272. 



Antheridium, 306, 416, 479. 



Anthoceros, 483, 504; Icevis, 483; 

 sporogonium, 483. 



Anthocerotales, described, 483. 



Anthocyanin, 88 ; composition, 108. 



Anthurium, 534. 



Antitoxin, 173, 407. 



Ants, cultivating Fungi, 473 ; in 

 dissemination, 363. 



Apetake, 540. 



Apogamy, 498. 



Apogeotropic, 247. 



Apophysis, 488. 



Apospory, 498. 



Apothecium, 448. 



Aquatic Formations, 586. 



AquQeffia, 295. 



Arales, described, 533. 



AraliacefB, 552. 



Araucaria, 523. 



Arceuthobium, 543. 



Archegoniatce, 492. 



Arohegonium, 800, 478. 



Archichlamydew, 540. 



Arctic Willows, 541. 



587 



