INDEX 
Starred page-numbers indicate where cuts occur. 
Parts I anp II 
Absorption of carbon dioxide, 166- 
170. 
Acacia, leaf of, *145. 
Accessory buds, 122, *123. 
Accessory fruits, *226. 
Acuminate, *131. 
Acute, *131. 
Adaptations to conditions of exist- 
ence, 394. 
Adherent, 204. 
Adnate, 204. 
Adventitious buds, 128. 
Adventitious roots, 36. 
Aerial roots, 36, *57, *38, *39. 
Agaricus, study of, 264-266*. 
Age of trees, 71. 
Aggregate fruits, 225, *226. 
Ailanthus twig, *121. 
Air, relation to germination, 10- 
12. 
Air chamber, *151, *153, *154. 
Air-passages in Hippuris stem,*173. 
Akene, *222. 
Albuminous substances, 22. 
Alge, 232, 241-257*. 
Alge, classification of, *257. 
Alge, study of, 241-257*. 
Alternate, *65, 66. 
Alternate leaves, *140. 
Alternation of generations, 278. 
Althea leaf, *152. 
Anatomy of plants (see under root, 
stem, leaf, flower, fruit, structure 
of ). 
Angiosperms, 233. 
Angiosperms, oldest, 304, 305. 
Animal food, need of, 344. 
Animals, defenses against, 345- 
352*. 
Annual growth, indefinite, 69. 
Annual ring, *100, *101. 
Annuals, 71. 
Anther, 201, 202, *203. 
Anther, modes of opening, *211. 
Antheridia, *284, 285. 
Antherozoids, 247, 248, *251, 254, 
*279, *284. 
Antipodal cells, *215. 
Ant-plants, 346, *347. 
Ants plant seeds, *386. 
Apetalous, *198. 
Apothecia, 271. 
Apple leaf, stipules of, *135. 
Aquatic roots, 37. 
397 
