634 
INDEX 
Peary, 309 
Peat-mosses, 193 
Pedicle, 197 
Pelargonium, 139, 339 
Pellionia daveaueana, 78 
Pelories, 482, 485 
Pendulum, illustration of the, 529 
Penicillium glaucum, 304 
Pennyroyal, 479 
Pepsin, 102 
Perennial pea, 466 
Pericarp, 493 
Perichaetium, 199 
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, 325 
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, i 
Phytophthora infestans, 292 
Phytoptus, 292 
Pine cone, 420 
Pine, Kauri, 610 
Scotch, 417, 418, 419 
Pine 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, 301, 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 
Podocarpineae, 83 
Polarity, 364 
Pollen, abundance of, 423 
and coal-formation, 424 
immediate effect of, 451 
shedding of, 424 
Pollen-chamber, 400 
