INDEX. 



Absorbed substances, path of, 40. 

 Absorption , conditions affecting, 307 ; process 



of, 36. 

 Accessory buds, 70. 

 Acer, 238. 



Adventitious buds, 70. 

 Adventitious roots, 44. 

 jEcidio spores, 281. 

 Aerial plants, roots of, 41. 

 Agaricus, 2S2. 

 Agave, 142, 321. 

 Ailanthus, 213. 

 Air plants, roots of, 41, 

 Alee, 237. 



Albumen water, 384. 

 Alfalfa, roots of, 39. 

 Algae, 264 ; nature of, 269. 

 Alhagi maurorum, 345. 

 Araaryllidaceae, 228. 

 Ament, 158. 



Anemone, 147, ISO, 20T ; seeds of, 213. 

 Angular divergence, determination of, 47. 

 Annuals, 132. 

 Anther, 165. 



Antheridium, 274, 287, 290. 

 Ants, leaf-cutting, 317, 318. 

 Archegonia, 297, 283, 290. 

 Arctic regions, vegetation in, 342. 

 Arisasma triphyllum, 219. 

 Aristolochia, study of, 48 ; cross section of 



stem of, 49. 

 Aristotle, 171. 

 Artichoke, 139. 

 Asci, 2S5. 

 Asclepias cornuti, 192, 248 ; bee gathering 



nectar from, 194; cross pollination of, 



191 ; diagram of flowers of, 193 ; seeds of, 



195, 213. 

 Asexual and sexual generations, comparison 



of, 294. 

 Asparagus medioloides, 136. 

 Astragalus caryocarpus, 237. 

 Atmosphere, 313. 

 Axillary buds, 70. 



Bacteria, cultures of, 254 ; disease-producing, 

 260 ; economic importance, 260 ; forms 



of, 257, 255, 259 ; nature of, 256 ; nitrify- 

 ing, 260 ; nitrogen-fixing, 261 ; reproduc- 

 tion of, 257 ; staining, 255. 



Balsam, 53. 



Bambusa, 334. 



Banyan, 139 ; prop roots of, 41. 



Barberry, 136, 160. 



Bark, diagram of, 5S ; effect of removal of, 

 59. 



Bast, diagram of, 55 ; use of, 56, 



Batis maritima, 323. 



Bean, castor, 8 ; Lima, 5. 



Bee, diagram of head of, 186 ; head of, 185 ; 

 pollen baskets of, 186, 187 ; relation of, to 

 flowers, 185. 



Beech, Cretaceous, 355. 



Beggar-ticks, 20S, 216. 



Biennials, 132. 



Bittersweet, 207. 



Black locust, 135. 



Bladderwort, 142, 145, 146. 



Bladder-wrack, 266. 



Bud, nature of, TO. 



Budding, 71. 



Buds, disposition of leaves in, 63 ; leaf and 

 flower, 69 ; position of, 70 ; summer, 66 ■ 

 unfolding of leaves of, 68 ; winter, 66. 



Burdock, 205, 216. 



Burr-grass, 216, 



Butterflies, relation of, to flowers, 183. 



Butterfly, diagram of head of, 184; proboscis 

 of, 184. 



Cabomba Caroliniana, 326, 827. 



Cacti, 73 ; stems of, 140. 



Cactus, 322. 



Calamltes, 353, 854. 



Calcium oxalate, occurrence of, in Arissema, 



220. 

 Callitricbe stagnaUs, 327. 

 Calyptra, 289. 

 Calyx, 164. 

 Cambium, 50; diagram of, 58 ; usefulness o^ 



114. 

 Camerarius, 171. 

 Capsella bursa-pastoris, 149, 233. 

 Capsules, of moss, 286. 



429 



