Index 
Nitrogen, 43 
Nostoc, 42 
N-rays, 217 
Oak forests, 223, 225, 229, 231, 250 
Oak-leaves, 182 
Oats, 284, 285 
Oenothera Lamarckiana, 298 
Old man’s beard lichen, 66 
Open floras, 21, 90, 93, 198 
Ophrys, 122 
Opsonins, 57 
Oranges, 287 
Orchids, 120, 151, 277 
Oscillatoria, 32 
PacirFic Islands, 280 
Palm-leaves, 332 
Pampas, 136, 266, 267 
Papyrus, 134 
Parasites, 41, 147 
Paspalum, 135 
Patanas of Ceylon, 185 
Peas, Mendel on, 301 
Peat, peat-moss, 70-78, 199, 225-227 
Perfume industry, 312 
Perie bush, 79 
Permanent pasture, 269-273 
Petals, 109 
Petroleum, 82 
Phagocytes, 56 
Phalaris, 137 
Phosphorescence, 38, 59 
Phragmites, 127, 130, 231 
Physcia, 67 
Pine, structure of, 237 
Pinus maritimus, 167 
Pitcher plant, 150 
Plankton, 36 
Plant breeding, practical, 284~294 
» 99 theory of, 295-306 
Podostemaceze, 183 
Poisonous plants, 199, 269, 310 
Poisons, effect of, 150, 160, 329, 330 
Pollen parent, effect of, 305 
Pollination, 116-118, 151, 159 
Polygonum amphibium, 127 
Polypodium, 80, 208 
Polytrichum, 70 
Pondweed association, 130 
Potatoes, 286, 293 
Potentillas, change in, 185 
Prairies, 267 
Preglacia] plants, 218, 227, 228 
Protoplasm, 17, 123, 140-143, 147 
149, 338 
Psamma, 165-168 
Pyrocystis, 38 
Rapium, 216 
Rafflesia, 203 
Rain, absorption of, 193 
Rain-leaves, 188 
Ray-florets, 121, 188 
Reconquest of water, 125 
Reed association, 130, 163 
Reid, Clement, 225, 227 
Regeneration, 155 
Renanthera Lowii, 114 
Renwick, Mr., 218, 219 
Resin, 154, 155, 332 
Respiration, 331 
Retama, 171 
Rhythm, 216 
Rice, 262 
Rock lichens, 65-69 
Roman Britain, 229 
Rontgen rays, 216 
Roots, 148 
Rubber, 320 
Rush association, 132 
Russell, Dr., 216 
Rust fungi, 82 
SaGINA, 186 
Sago, 274, 275 
Salix, 93 
Salt, 157-162, 329 
Saltwort, 158-161 
Sand-dunes, 164-167 
Sand plants, 164 
Saprophytes, 335 
Sargasso Sea, 36 
Scent, 113 
Scented Labiates, 308, 310 
Scirpus associations, 130, 162 
Scotch pine, forests of, 75, 223, 225- 
230, 238, 239 
Scrub, 307-315 
Seaside plants, 157-168 
Season of flowering, 119 
Seed, dispersal of, 102, 129, 202, 203, 
277 
Selection, method of, 284 
si by one seed, 287 
Self-surgery, 153, 154, 332 
Sempervivum, 173 
Sense life and sensitiveness,123, 140-1 51 
35! 
