454 



GENERAL BOTANY 



Orbicular leaf, 355* 



Orchidaceae, 427*, 428 



Organic food cycle, 11*, 285* 



Organic foods, 9 



Ornithogalum, 419* 



Orthotropous ovule, 363 



Osmosis, 137, 139* 



Osmosis, experiment in, 138* 



Osmotic pressure, 138 



Outgo of animal, 9* 



Outgo of plant, 8* 



Oval leaf, 355* 



Ovary, simple and compound, 363* 



Oviate leaf, 355* 



Ovules, 164, 165* 



Ovules, campylotropous, 363 



Ovules, kinds of, 363 



Ovules, orthotropous, 363 



Palet of oat flower, 434* 



Palisade tissue of leaf, 113*, 115* 



Palmate venation, 354, 355* 



Panicle, 358* 



Panicle of oat, 433* 



Papilionaceous flowers, pollination 



of, 168 



Pappus of dandelion, 412* 

 Parallel venation, 354, 355 

 Paraphyses of moss, 293, 294* 

 Paraphyses of mushroom, 269*, 270 

 Parasites, 242 



Parenchyma, palisade, 113*, 115* 

 Parenchyma, phloem, 92*, 93* 

 Parenchyma, spongy, of leaf, 115* 

 Parenchyma, wood, 93*, 94 

 Parenchyma of cortex, 92 

 Parmelia, 279* 

 Pasteurization, 255 

 Path of water, 141* 

 Pathology, plant and animal, 215 

 Pea, crossing of, 1 78 

 Pea, flower of, 169* 

 Pea, tropisms of, 24* 

 Peas and Mendel's laws. 184* 188*, 



189*, 190* 



Pedigree culture, 205 

 Peduncle, 161, 357* 

 Penicillium, 264*, 265* 

 Perennial, seasonal life of, 133* 

 Perfect flowers, 360* 

 Perianth of flower, 161 

 Pericycle, 111 



Pericycle of fern rhizome, 305* 

 Pericycle of roots, 111 

 Peridium of puffball, 271 

 Perigynous flowers, 358*, 409* 

 Peristome of moss, 295* 



Permanent zone of root, 62, 63* 



Petiole, 15*, 17* 



Phloem, 84, 85*, 92* 



Phloem, elements of, 96*, 97 



Phloem, fibers of, 92* 



Phloem, parenchyma of, 92* 



Photosynthesis, 117-120, 127* 



Photosynthesis and respiration, 123 



Phototropic response, 30 



Phototropism of nasturtium, 26* 



Physcia stellaris, 278* 



Physiology, 58, 214 



Physiology of bean plant, 127* 



Picea (spruce), forest of, 325, 326* 



Picea (spruce), gametophytes of, 334* 



Picea (spruce), ovule and seed of, 335 



Picea (spruce), sporangia and spores 

 of, 333 



Picea (spruce), strobili of, 331*, 332* 



Picea (spruce), wood structure of, 

 327*, 328* 329* 



Pileus of mushroom, 268*, 269* 



Finales, 325, 327 



Pine, cones of long-leaf, 379* 



Pine, section of, 378* 



Pine nursery, 377* 



Pines, erect type, 19, 20* 



Pines, forest trees, 378-380 



Pinnate venation, 300, 354, 355 



Pinnule, 300 



Pinus palustris, cones of, 379*, 380 



Pistil, 162*, 169* 



Pistils, compound, 363* 



Pistils, kinds of, 363* 



Pistils, simple, 363* 



Pisum sativum, crossed and self-fer- 

 tilized plants of, 178 



Pith, 85 



Pits, bordered, 327*, 328* 



Placenta, 162*, 163 



Placentae, kinds of, 363* 



Plankton, 219 



Plant associations, 435, 445 



Plant associations, kinds of, 435 



Plant associations, origin of, 436 



Plant body, plan of, 14 



Plant disease, 281 



Plantain, vegetative reproduction, 156* 



Plants, industrial and commercial re- 

 lations of, 12 



Plants, relations to animals, 8, 9 



Plastids, 49, 50*, 51 



Pleurotus ulmarius, 272 



Plums, hybridization of, 182* 



Plumule of pea, 24* 



Polar nuclei, 164, 165*, 347* 



Pollen, 163, 164* 



