INDEX 
601 
All numbers refer to pages, heavy type indicating illustrations. 
Polygonacee, Buckwheat Family 
Polygonales, Buckwheat Order 
Polygonum Convolvulus, Climbing 
Buckwheat 
Polypodiacee, Polypody Family 
Polypody Family: male-fern, 179; 
pteris, 537 
Polyporacee, Pore-mushroom 
Family 
Pome, 365 
ee aes 478, 479, 480, 499, 
55 
Pond-scum Family: pond-scum, 
479, 480 
Poplar, 241, 263, 264, 377, 414, 
415; wood, 263 
Poppy, 208, 406, 407 
Poppy Family, 361, 398, 406, 407: 
opium poppy, 182, 183 
Poppy-oil, 296 
Poppy, Opium, see Opium Poppy 
Poppy Order, 363, 398, 408, 409 
Populus tremuloides, Poplar 
Porcupine-wood, 272 
Pore-mushroom Family: amadou, 
241 
Pores of wood, 252, 538 
Poricidal dehiscence, 362; of an- 
thers, 379 
Portable boats, 284 
Portulacacee, Portulaca Family 
Posts, 258, 270 
Potash in grains, 31 
Potassium, 74 
Potato berries, poisonous, 210 
Potato, sweet, 43, 58, 59, 379, 
416, 417; white, 43, 59, 60, 210, 
382, 416, 417 
Potentialities of protoplasm, 572 
Pot-herb Jute, 232 
Pot-herbs, 55 
Powdery mildew, 499, 500 
Powdery-mildew Family: powdery 
mildew, 500 
Preference, power of, 569 
Prehistoric food-plants, 124 
Prickly Sago Palm, 109, 110 
Primary leaves, 318, 319; tissue, 
542 
Primitive centers of agriculture, 
122, 123 
Primitive man, 302 
Primitive versus degenerate forms, 
549 
Primrose Family, 401 
Primrose Order, 401 
Primulacee, Primrose Family 
Primulales, Primrose Order 
Princes of the Vegetable Kingdom, 
389 
Principes, Palm Order 
Printing-ink, 294, 295 
Printing-paper, 224 
Progress and peace, 468; in evolu- 
tion, 466; made in spite of com- 
petition, 468 
Progressive fixity of growing struc- 
tures, 571 
Prolific multiplication, 512 
Prosenchyma, 530 
Protection, organs of, 321, 538 
Proteid, 33, 74, 114, 115, 471 
Protein in foods, 114 (see also Pro- 
teid) 
Prothallial cells, 556 
Prothallus, 533, 536, 551 
Prothallus-cell, 546 
Protonema, 523, 526 
Protoplasm, 471; artificial, 562; 
fundamental properties of, 571; 
potentialities of, 572 
Protoplast, 473 
Protoplasts, artificial, 564; fusion 
of, 560 
Prunus Amygdalus, Almond 
Cerasus, Sour Cherry 
domestica, Plum 
Persica, Peach 
serotina, Wild Black Cherry 
Prussic acid in cherry leaves, 204; 
in cherry stones, 205 
Pseudo-fibers, 225, 239 
Pseudopodium, 525 
Pseudo-root, 481, 521, 536 
Pseudo-shoot, 481 
Pseudo-woods, 256, 272 
Pteridophyta, Pteridophyte Divi- 
sion 
-Pteridophyte Division, 548 
Pteridophytes, 394, 396 
Pteris, 537 
Pubescent, 343 
Pulse, 35, 40 
Pulse Family, 365, 398, 399, 410, 
