INDEX 



References to illustrations are indicated by stars. App. indicates Appendix 



Absorption of carbon dioxide, 107, 

 108 



Absorption of water by roots, 28 

 t Absorption, root, 30 



Absorption, selective, 36 



Acacia, leaf of, 98* 



Accessory buds, 82*, 84* 



Accessory fruits, 146, 149*, 150* 



Actinomorphic, 125 



Acuminate, App. I 



Acute, App. I 



Adaptations to conditions of exist- 

 ence, 496, 497 



Adder's-tongue, 324* 



Adventitious buds, 83, 87* 



Adventitious roots, 19 



^Ecidium, 261, 262* 



Aerial roots, 19-21* 



Agaricus, 267 



Age of trees, 46 



Aggregate fruits, 146, 149*, 150* 



Ailanthus twig, 81* 



Air chamber, 103*, 104* 



Air passages, in Hippuris stem, 111* 



Air plants, 47* 



Air, relation to germination, 7 



Akene, 147* 



Albugo, 245* 



Albuminous substances, 9 



Alga-like fungi, 239-247* 



Alga-like fungi, summarv of, 247 



Algae, 172, 173-226* 



Algae, distribution of, on rocks, 215* 



Algae, evolution of, 225, 226 



Algae, life histories of, 221, 222 



Alpine vegetation, 484-487*, 493 



Alternate branching, 41* 



Alternate leaves, 81* 



Alternation of generations, 220, 278, 

 345-350 



Alternation of generations, proto- 

 plasmic basis of, 345-348 



Amanita, 267 



Amoeba, 158*, 159 

 Anabaena, 176, 177 

 Angiospermae, 376-388* 

 Angiosperm flower, 376-379* 

 Angiosperm, life history of, 388 

 Angiosperms, 128, 376-388* 

 Angiosperms, classification of, 397 

 Animal food, need of, 412 

 Animals and plants, distinctions 



between, 168, 169 



Animals, defenses against, 413-419* 

 Annual growth, definite, 42 

 Annual growth, indefinite, 42 

 Annual ring, 66*, 68* 

 Annuals, 46 



Anther, 127*, 139, 140*, 378-380* 

 Anther, modes of opening, 140* 

 Antheridium, 189*, 204, 275*, 276 

 Antherozoid, 189, 204 

 Anthoceros, 288*, 289* 

 Anthocerotales, 288*, 289* 

 Antipodal cells, 144*, 383* 

 Antitoxins, 236 

 Ant plants, 414*, 415 

 Ants plant seeds, 446* 

 Apetalous, 123, 124* 

 Apogamy, 244, 319, 320 

 Apospory, 320 



Apples, selection among, 503* 

 Aquatic plants, 459-462*, 488 

 Archegonium, 276* 

 Archichlamydeae, 397, 398 

 Arch of hypocotyl, 6*, 12*, 13 

 Arctic vegetation, 484 

 Arctic willow, 484* 

 Aristolochia stem, bundle of, 61* 

 Aristolochia stem, cross section of, 



60*, 61* 



Arrangement of leaves, 94-101* 

 Arrow-shaped, App. I 

 Artemisia, 480, 493, 494 

 Ascocarp, 248, 250 

 Ascomycetes, 248-257* 



541 



