INDEX 



GOl 



All numbers refer to pages, heavy type indicating illustrations. 



Polufjonacecv, Buckwheat Family 

 Polygonales, Buckwheat Order 

 Polt/goniun Convolvulus, Climbing 



Buckwheat 

 Poll/ pod iaccfc, Polypody P^amily 

 Polypody Family: male-fern, 179; 



pteris,'537 

 Polijporncece, P o r e-m u s h r o o m 



Family 

 Pome, 365 

 Pond-scum, 478, 479, 480, 499, 



558 

 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 

 Popp)'-oil, 296 



Poppv, Opium, sec Opium Poppy 

 Poppy Order, 363, 39S, 408, 409 " 

 Populus treuiuloides, Poplar 

 Porcupine-wood, 272 

 Pore-mushroom Family: amadou, 



241 

 Pores of wood, 252, 538 

 Poricidal dehiscence. 362; of an- 

 thers, 379 

 Portable boats, 284 

 Portulacaca, 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 



Prit)iulnc('n\ Primrose Family 



Priuiiildle!^, Primrose Order 



Princes of the Vegetable Kingdom, 

 389 



Prindpes, 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 (sec also Pro- 

 teid) 



Prothallial cells, 556 



Prothallus, 533, 536, 551 



Prothallu.s-cell, 546 



Protonema, 523, 526 



Protoplasm, 471; artificial, 562; 

 fundamental properties of, 571; 

 potentialities of, 572 



Protoplast, 473 



Protoplasts, artificial, 564; fusion 

 of, 560 



Pi'imus Amijgdaliis, 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 



Plcridophijta, Pteridophyte Divi- 

 sion 



Pteridophyte Division, 548 



Pteridophytes, 394, 396 



Pteris, 537 



Pubes(;ent, 343 



Pul.se, 35, 40 



Pulse Family, 365, 398, 399, 410, 



