634 



INDEX 



Pendulum, illustration of the, 529 

 Penicilium glaucum, 304 

 Pennyroyal, 479 

 Pepsin, 102 

 Perennial pea, 466 

 Pericarp, 493 

 Perichastium, igg 

 Peridermium pyriforme, 301 



Strobi, 301 

 Perisperm, 421 

 Petalody of bracts, 462, 466 



of stamens, 462, 465, 466 

 Petals, 435 



coalescence of, 462 

 Petiole, 13 



structure of, 35 

 Petrifaction, 578 

 Phaseolus, 123 



vulgaris, 525 

 Phloem, 67 

 Photosynthesis, 77 



respiration and, no 

 Phototropism, 135 

 Phyllitis, 156 

 Phylogeny, 504, 569 

 Phymatodes, 154 

 Physalis alkekengi, 545 

 Physcia stellaris, 329 

 Physiology, 4 

 Phytogeography, 5 

 Phytology, 1 



Phytophthora infestans, 292 

 Phytoptus, 292 

 Pine cone, 420 

 Pine, Kauri, 610 



Scotch, 417, 418, 419 



white, 421, 422, 423, 428, 429, 

 430 

 Pine shoot moth, 301 

 Pine tree blister-rust, 301 

 Pines, 413 

 Pinnae, 156 



Pinnules, 156 

 Pinus, 447 



austriaca, 416 



contorta, 301 



ponderosa, 301 



rigida, 3or, 415 



Strobus, 415, 421, 422, 423, 

 428, 429, 430 



sylvestris, 415, 417, 418, 419 

 Pistil, 436 

 Pisum, 123 



sativum, 468, 554 

 Placenta, 437 



Plant and animal respiration, 112 

 Plant-respiration, 105 

 Plant secretions, economic value 



of, 90 

 Plantago, 37 

 Plantain, 37 



Plants and animals, nutrition of, 70 

 Plants to man, relation of, 2 

 Plasma-membrane, 17 

 Plasmolysis, 59 



Pleurococcus, 252, 253, 328, 344, 362 

 Plum, brown rot of, 293 



pockets, 293 

 Plums, black knot of, 295 

 Plumule, 443 

 Podetia, 331, 332 

 Podocarpineas, 83 

 Polarity, 364 

 PoUen, abundance of, 423 



and coal-tormation, 424 



immediate effect of, 451 



shedding of, 424 

 Pollen-chamber, 400 

 Pollen-grain, 401, 436 

 Pollen-sacs, 436 

 Pollination, 401, 427 

 Pollinium, 477, 501 

 Polypetate, 436 

 Polypodium, 154, 156, 159 



