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, 15 1, 2"]^ 



Oscillatoria, 32 



Pacific 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, 1 50 

 Plankton, 36 



Plant breeding, practical, 284-294 

 „ ,, theory of, 295-306 

 Podostemaceae, 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 

 Preglacial plants, 218, 227, 228 



Protoplasm, 17, 123, 140-143 . U7 



149, 338 

 Psamma, 165-168 

 Pyrocystis, 38 



Radium, 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, i54» 1 5 5. 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, 1 58-161 



Sand-dunes, 164-167 



Sand plants, 164 



Saprophytes, 335 



Sargasso Sea, 36 



Scent, 113 



Scented Labiates, 308, 310 



Scirpus associations, 130, 163 



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 



,, by one seed, 287 

 Self-surgery, 153, 154, 332 

 Sempervivum, 173 

 Sense life and sensitiveness, 123, 140-1 5 1 



351 



