INDEX 



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



Absorption of carbon dioxide, 107, 

 108 



Absorption of water by roots, 28 



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, 201, 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, summary 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- 

 plastic 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, 897, 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 



