INDEX 



635 



Polypodium, irioides, 154 



punctatum, 153 

 Polytrichum commune, 206 

 Populus, 457 



Porella navicularis, 211, 212 

 Potato, 335, 347, 480 



blight, 313 



rot, 292 



tuber, 81 

 Potatoes, little, 291 

 Potonie, 598 

 Pressure, osmotic, 58 



and growth, osmotic, 113 

 Priestly, Joseph, 73, 74 

 Primofilices, 616 

 Proangiosperms, 606 

 Propagation, 180 

 Prophylaxis, 310 

 Protease, 79, 86 

 Protein, 16 

 Proteins, 71 



manufacture of, 84 

 Prothallus, 166, 167 

 Protonema, 165, 166 

 Protoplasm, 14, 15 



properties of, 19 

 Protoplast, 16 

 Psedera tricuspidata, 144 

 Pseudobomiales, 618 

 Pseudomonas radicicola, 83, 332 

 Pseudopodium, 200, 201 

 Psilotales, 618 

 Pteridophytes, 366, 388 

 Pteridosperms, 592 



significance of, 598 

 Pteris, 156 



aqiulina, 149, 155 



longifoUa, 153 

 Pteropsida, 616 

 Ptyalin, 100 

 Puccinia graminis, 299 

 Punk, 303 



Purity of gametes, theory of, 555 



Pussy-willow, 458 



Putrefaction, 319 



Pyrenoids, 353 



Pyrolaceas, 473 



Pythium de Baryanum, 291 



Quarantine, 311 

 Quercus, 336 



novimexicana, 34 

 Quetelet, 524 

 Qu6telet's curve, 525, 526 



R 



Radicle, 381, 464 



Ranunculacese, 459 



Ranunculus, 459, 460, 461, 462 

 aquatilis, 507 



Rattan, 495 



Rattlesnake fern, 176 



Ray, John, 453 



Recptacle, 155 



Redi, 89 



Reduction, 183, 184 

 division, 185, 187 



Regeneration, 205 



Reproduction, asexual, 179 

 by spores, 180 

 cell-division and, 344 

 essence of all, 180 

 inheritance and, 544 

 sexual, 179, 180 



Respiration, 105, in 



and fermentation, 112 

 and photosynthesis, no 

 versus breathing, 107 



Response, stimulus and, 125 



Rex begonia, 347, 447 



