398 



FOUNDATIONS OF BOTANY 



Arch of hypocotyl, 25-27. 

 Archegonia, *284, 285, *295. 

 Arctic willow, *328. 

 Aristoloohia stem, bundle of, *88. 

 Aiistolochia stem, cross-section of, 



«87, 88. 

 Arrangement of leaves, *140, *14] . 

 Arrow-shaped, *132. 

 Asci, 263, 270, 273. 

 Asoomycetes, 232. 

 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 hud, »122. 

 Axillary flowers, *186. 



Bacillariales, 232. 



BacUli, *237. 



Bacteria, 232, *237. 



Bacteria, manufacture of nitric acid 



hy, 340. 

 Bacteria, study of, 238, 239. 

 Barhed hairs, *351. 

 Barberry, spiny leaves of, *348. 

 Bark, 86, *91, 104. 

 Basidia, *266. 

 Basidiomycetes, 232. 

 Bast, *87, »91, *92. 

 Bast-hundle, *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, "ISl. 

 Beggar's ticks, *884. 

 Begonia leaf, osmose in, 51. 



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, 302. 

 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, *153. 

 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. 



