INDEX. 



467 



Nucellus, 103, 104, 356 

 Nucleoli, 48 

 Nucleus, 1, 2, 48, 124 

 Nut, 400 

 Nutations, 87, 92 



Oak, 28, 401 



Odors, 379, 384, 400 



Oedogonium, 177, 178 



Oenothera, 27, 43 ; 



Onoclea, 299 



Oogonium, 176 



Oosphere, 176, 248 



Operculum, 271, 272 



Ophioglossales, 284 



Ophioglossum, 285 



Orange, 427 



Orchid order, 389 



Orchidales, 389 



Orchis, 392 



Order, 132 



Oscillatoria, 147 



Osmosis, 45 



Osmunda, 296, 297 



Ovary, 102, 103, 347 



Ovule, 102, 103, 104, 347, 366 



Oxygen, 3, 13, 15, 20 



Palisade mesophyll, 10, 36 

 Pallavicinia, 261 

 Palms, 272 

 Pandanales, 368 

 Pandorina, 159, 160 

 Papaverales, 410 

 Papillae of stigma, 356, 359 

 Papilionaceae, 420 

 Pappus, 453, 454 

 Paraphyses, 188, 275, 276 

 Parasites, 56, 195 

 Parenchyma, II, 64 

 Parmelia, 237 

 Parnassia, 415 

 Pasteur, 145 

 Pea, family, 420 



sweet, 420 

 Peach curl, 209 

 Peat moss, 269 



Pediastrum, 164 



Penicillium, 196, 206, 209, 210 



Perennials, 60 



Perianth, 101, 260, 264, 346, 350 



Periderm, 234, 235 



Perigynous, 352, 353 



Perisperm, 365 



Perisporiales, 212-214 



Peristome, 277, 278 



Perithecia, 206, 211 



Peronospora, 199, 200 



Peronosporales, 199 



Petals, 101, 350 



Petiole, 7, 8 



Peziza, 218 



Pezizales, 219 



Phaeophyceae, 181 



Phallales, 236 



Phallus, 236 



Phloem, 52, 64, 65, 66, 67 



Phosphorescence, 299 



Phlox order, 442 



Photosynthesis, II 



Phycomycetes, 197 



Phyllactinia, 214 



Phylloglossum, 312 



Phytophthora, 199, 200 



Picea, 343 



Pierce, 170 



Pileus, 229, 230 



Pinales, 330 



classification of, 343 

 Pine, 331, 333, 334, 336 

 Pinguicula, 448 

 Pinnularia, 150, 153 

 Pistil, 102, 366 

 Pith, 64 

 Placenta, 355 

 Plankton, 148 

 Planktoniella, 150 

 Plant, nature of, 1 



cell, 1 

 Plasmodium, 136, 137 

 Plasmopara, 200, 201 

 Plastids, 2, 17 

 Pleurococcus, 162 

 Plowrightia, 215 



