_Aspidium_, Fig. 70. _Asplenium_, 104; Fig. 70. Aster, 224. _Atropa_. See "Deadly nightshade." Axil, 174. Azalea, 210; Fig. 116. _Azolla_, 117; Fig. 71. Bacteria, 15, 17, 19; Fig. 8. Balsam, _Balsamineæ_, 198. Bamboo, 162. _Bambusa_. See "Bamboo." Banana, 163. Barberry, 17, 187; Fig. 101. Bark. See "Cortex." _Basidiomycetes_, 77. Basidium, 77, 80, 83. Basswood, 195; Fig. 106. Bast. See "Phloem." _Batatas_. See "Sweet-potato." _Batrachospermum_, 53; Fig. 31. Bean, 207, 208. Bear-grass. See "_Yucca_." Bee, 227, 228. Beech, 183. Beech-drops, 218. Beet, 184. Beggar's-ticks, 215. Begonia, 3, 205. Bell-flower, 220, 226; Fig. 123. Bellwort, 156. _Berberis_, _-ideæ_. See "Barberry." Bergamot oil, 234. Berry, 145, 156. _Betulaceæ_, 183. _Bicornes_, 210. _Bignonia_, _-aceæ_, 218. Biology, 2. Birch, 183. Bird's-nest fungus. See "_Cyathus_." Bishop's cap, 202; Fig. 111. Bismarck brown, 233. Bitter-sweet, 199; Fig. 109. Black alder, 199. Blackberry, 207. Black fungi. See "_Pyrenomycetes_." Bladder-nut, 199; Fig. 108. Bladder-weed, 33, 217; Fig. 120. Bleeding-heart. See "_Dicentra_." Blood-root, 191; Fig. 103. Blue-eyed grass, 156. Blue-flag. See "_Iris_." Blue-green slime, 15. Blue valerian. See "_Polemonium_." Borage, 215. _Borragineæ_. See "Borage." Bordered pits, 138. Botany defined, 2. systematic, 3. _Botrychium_. See "Grape fern." Box, 201. Bract, 199, 222, 229. _Brasenia_. See "Water-shield." Breathing pore, 91, 99, 113, 130, 147, 150, 177. _Bromeliaceæ_, 156. Bryophyte, 86. Buck-bean, 218. Buckeye, 171, 199. Buckthorn, 199. Buckwheat, 184. Budding, 64. _Bulbochæte_, 28; Fig. 16. Bulb, 146, 153, 172. Bulrush, 161; Fig. 87. Bundle-sheath, 110, 176. Burning-bush. See "Spindle-tree." Bur-reed, 159; Fig. 86. Buttercup, 181, 185; Fig. 99. Butterfly, 227, 228. Button-bush, 223. Buttonwood. See "Sycamore." _Buxus_, _Buxaceæ_. See "Box." Cabbage, 192. _Cabombeæ_, 190. Cactus, _Cactaceæ_, 203; Fig. 112. _Cæsalpineæ_, 210. Calcium, 2. Calla, 157, 229. _Callithamnion_, 50-52; Fig. 29. general structure, 51. tetraspores, 51. procarp, 51. antheridium, 51. spores, 52. _Callitriche_, _-chaceæ_. See "Water starwort." _Calluna_. See "Heath." _Calopogon_, 166; Fig. 91. _Calycanthus_, _-aceæ_, 187; Fig. 100. _Calycereæ_, 223. _Calycifloræ_, 200. Calyx, 174, 182. Cambium, 137-138, 175. _Campanula_. See "Bell-flower." _Campanulaceæ_, 220. _Campanulinæ_, 220. Canada balsam, 230-234. Canada thistle, 224; Fig. 125. _Canna_, _-aceæ_, 162, 163; Fig. 88. Caper family, 194. _Capparis_, _-ideæ_. See "Caper." _Caprifoliaceæ_, 223. _Capsella_. See "Shepherd's-purse." Caraway, 202. Carbon, 2, 95. Carbon-dioxides, 95. Cardinal-flower. See "Lobelia." _Carex_, 161; Fig. 87. Carmine, 25, 233. Carnation, 185. Carpel, 148, 154, 175, 179. Carpophyll. See "Carpel." Carpospore, 51-53. Carrot, 202. _Caryophylleæ_. See "Pink." _Caryophyllus_. See "Clove."