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 



Perichastium, 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, 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, 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 • 



