398 
Arch of hypocotyl, 25-27. 
Archegonia, *284, 285, *295. 
Arctic willow, *328. 
Aristolochia stem, bundle of, *88. 
Aristolochia stem, cross-section of, 
*87, 88. 
Arrangement of leaves, *140, *141. 
Arrow-shaped, *152. 
Asci, 263, 270, 275. 
Ascomycetes, 252. 
Asexual generation, 278, 
Ash tree, naturally grafted, *99. 
Asparagus, 79, *80. 
Aspidium, *288. 
Asplenium, study of, 286-289*. 
Assimilation, 171, 172. 
Autumn leaves, coloration of, 176. 
Axillary bud, *122. 
Axillary flowers, *186. 
Bacillariales, 232. 
Bacilli, *237. 
Bacteria, 232, *237. 
Bacteria, manufacture of nitric acid 
by, 340. 
Bacteria, study of, 258, 239. 
Barbed hairs, *351. 
Barberry, spiny leaves of, *348. 
Bark, 86, *91, 104. 
Basidia, *266. 
Basidiomycetes, 252. 
Bast, *87, *91, *92. 
Bast-bundle, *92. 
Bean-pod, study of, 219. 
Bean seed, 7, 8. 
Beech twig, 64. 
Beech-wood, cross-section of, *101. 
Bees, 355, *356, *360. 
Beet leaf, *151. 
Beggar’s ticks, *384. 
Begonia leaf, osmose in, 51. 
FOUNDATIONS OF BOTANY 
Bell-shaped, *202. 
Belt’s bodies, *347. 
Berry, *225. 
Berry, study of, 217. 
Biennial, 47, 71. 
Biogenesis, law of, 299, 300. 
Birch, branching of, *71. 
Bird-pollinated flowers, 362. 
Birds plant seeds, 385, *386. 
Black mould, study of, 257, 258, 
259. 
Bladder-wrack, *250. 
Botanical geography, 324-335. 
Botanical geography of United 
States, 333-335. 
Botany, definition of, 1. 
Box-elder, buds of, *123. 
Box-elder, radial and cross-sections 
of stem of, *89. 
Bract, *186, 187. 
Branches formed from adventitious 
buds, 128. 
Branching, alternate, *65, 66. 
Branching and leaf-arrangement, 
64, 65. 
Branching, opposite, *65. 
Branch-spine, *69. 
Brazil nut, food stored in, 23, 24. 
Breathing-pore, *155. 
Bryophytes, 232, 277, 278. 
Buckeye, bud of, *120. 
Bud, horse-chestnut, 119, 120. 
Bud-scales, 121. 
Buds, 118-129. 
Buds, adventitious, 128. 
Buds, dormant, 127, 128. 
Buds, naked, 121. 
Buds, position of, 121, *122, *123, 
*124, . 
Buds, structure of, 119, *125. 
Bulb, 77, *79. ; 
