Index 
Aaron Hill, 333 
Abele, 50 
Absciss layer, 367, 368 
Abundant pollen of coniferz, 
286 
Accessory buds, 60 
Acorn, 71, 83, 84, I1g, 120 
Acorn-cup, 71 
Acorns, IIg 
“Adam’s Needle and Thread,” 
207 
Adders’ tongues, 251, 266 
prothalli of, 252 
Adventitious buds, 61 
Aerial roots, 234 
Age of Reptiles, 285 
Albuminous seeds, 119 
Alcohol, 94 
Aleurone, LIg 
Alga, fresh-water, 94, 95 
Alge, land, 385 
Alkali-grass, 153 
Allen (Grant), quoted, 86, 319, 
320 
‘“‘Alternate"’ leaf arrangement, 
122 
Alternation of generations in 
ferns, 258 
Amaranth, 353, 354, 355 
American Beauties, 136 
‘American flannel-plant,” 347 
Andersen (Hans Christian), 
quoted, 380 
Annuals, 370 
Ants, 28, 79, 340, 341 
Anthers, 24, 40 
Anther-ring, 42 
Apex of growth, 59 
Apple-blossom, 136 
Apple-seeds, 136 
Apocynum  androsemifolium, 
303 
Apocynum cannabinum, 309 
Aquatic flowers, 30, 31 
Arbor vita, 270, 272 
Archegonia, formation of, 255 
Archegonia of the pine, 292, 293 
Archegonia of selaginella, 291 
Arrow-head, 112 
Atrrow-root, 295 
Asclepias cornuti, 309 
Ash, 62 
Ash buds, 76 
Ash, prickly, 74 
Ash, white, 75, 76 
Ash analyses of leaves, 369 
Asparagus, 94 
Asphodels, 355 
Asters, 352 ~ 
Atrophy, 84 
Awn, 169 
Bacteria, 97 
Bald cypress, 270, 274, 298 
Balsam, 282 
Balsam fir, 276 
Bamboos, 173 
Barbed fruits, 350 
Barberry, 114 
Bark, green, 132 
Bark, nature of, 386 
Bark, outer, 388 
Barley, 62, 103, 118, 151 
Basis of life (physical). go, 91 
Bast, 128, 129, 130, 396 
Bast-tubes, 128, 133 
Bay, 273 
Beach grass, 155 
401 
