300 BRITISH 
Ants and flowers, 172; 
133 
Apocarpous ovaries, +183 
Apple, 149; bud-scales, 61; polli- 
nation, 174; fr., 143, 184, 193, 
194 ; suckers, 155 
Apricot suckers, 155 
Aquatic associations: in slowly- 
flowing water, 235; standing 
water, 236 ; swiftly-flowing water, 
234 
Aquatics, 28 ; aeration of, 52; air- 
spaces in, 47 ; annual, 55 ; brood- 
buds in, 54; chars. of, 47; 
chlorophyll in, 49 ; colour of, 53 ; 
cuticle in, 48; dangers to which 
exposed, 52; distribution, 233; 
free-floating, 237; leaf-form in, 
50; in relation to light, 52; 
origin of, 55; pollination, 166, 
275 ; propagation, 53 ; respiration 
in, 48, 50, 52 ; rooted, 237 ; roots, 
49; seeding of, 54, 275; trans- 
piration of, 52; vascular system 
of, 49 ; zoning of, 236 
Aquatic vegetation: fresh - water, 
230, 231, 233 ; maritime, 231, 275 
Aqueous rocks, +82 
Arabis, 115 
Arable land, 18, 19 
Arbutus Unedo, 23, 211, 212, 213; 
berries, 149 
Arctic plants, 72 
Arenaria ciliata, 
218 
Aril, 196, 197 
Aristolochia (Birthwort or Dutch- 
man’s-pipe), fly-trap, 176 
Arrack, 151 
Arrowhead. See Sagittaria sagitti- 
folia 
Arrowroot, 150 
Artichoke, 150 
Artificial habitats, 16, 215, 216; 
manures, 97; pastures, 20, 261, 
264 
Arum maculatum berries, 149, eaten 
by thrush, 152; pollination, *175 
Ash, 22, 269; bud-scales, 61; fr., 
186, *187; fruit-dispersal, 195; 
weeping, origin of, 154 
Ash of plants, 80 
Ash-oakwood association, 229, 272 
Ashwood-association, 229, 272 
Asparagus, 150 
Aspidistra: leaf-type, 42; pollina- 
tion, 176 
symbiosis, 
213; peploides, 
| Beech, 
PLANTS 
Assimilation, 4; in aquatics, 53 ; 
light-rays necessary for, 66; of 
nitrogen by bacteria, 95, 99; in 
xerophytes, 38 
Associations, 224, 227; alpine, 251, 
255, 259 ; aquatic, 234 ; bog-, 246, 
251, 252, 253 ; classification of, 
229 ; grassland.-, 257 ; herbaceous, 
230; influence of man on, 226; 
maritime, 275 ; marshland-, 241, 
244 ; methods ‘of studying, 226; 
moorland-, 225, 248 ; strand-, 277; 
woodland-, 265 
Atmosphere, 6, 34, 76 
Atmospheric equilibrium, 77 
Atriplex portulacoides, 218 
Atropa Belladonna : poison, 136, 143; 
pollination, 174 
Atropin, 143 
Aucuba, 154 
Autogamy, +164 
Autotrophie pls., 6, 123 
Avens See Gewm; mountain-. 
Dryas octopetala 
Awl-type of leaf in aquatics, 50 
Awlwort. See Subularia 
See 
Baeteria: action on dead organic 
matter, 83 ; injurious, 61 ; nitrate, 
95 ; nitrogen-, 95, 99; parasitic, 
125 ; saprophytic, 123; soil-, 83, 
93, 95, 96, 97, 123 
Ballota nigra, 216. See Horehound 
Balsam. See Jmpatiens Noli-me- 
tangere 
Bamboo, 212 
Banana, 149. See Musa Sapientum 
Barberry : honey, 172; root-suckers, 
155; spines, 140, *141. See 
Berberis vulgaris 
Barley : alcohol from, 151; crops, 98; 
cultivation of, 20; food, 147; 
starch, 146 
| Bartsia: parasitic nature of, 126; 
water-glands of, 127 
Bastard - toadflax. See Thesium 
humifusum 
Bay-laurel, 42 
Beach, 16, 58 ; veg. of pebbly weit 
283 ; of sandy beach, 279 
Beachy Head, 77, 284 
Bean : climber, 116 ; protein of, 147; 
root-nodules, 95; seed, 146; dis- 
persal of seed, 195 
Bedstraw, 217. See Galiwm 
22; bud-scales, 61; fr., 
187; insects on leaves of, 144; 
