INDEX 



599 



Pollination, 46; agents, 46; kinds, 47; 

 kinds giving best results, 52;. 

 nature, 46; results, 50; self- 

 close-, and cross-, 48. 



Polyadelphous flowers, 15. 



Polycotyledons, 67. 



Polyembryony, 467. 



Polygonaceae, 478-480. 



Polygonum Muhlenbergii, 227, 479*. 



Polypetalae, 481-^89. 



Polypetalous flowers, 13. 



Polyporaceae, 387. 



Polysiphonia, 327, 328*. 



Polysiphonia violacea, 328*. 



Pome type of fruit, 78, 78*. 



Pond Lily society, 511*. 



Pondweed societies, 505. 



Porella, 415. 



Postelsia, 319. 



Potassium, as a soil constituent, 158. 



Potato Blight, 357, 358*, 359*, 360*. 



Potato scab, 348, 247* 



Powdery Mildews, 373-375; on Apple 

 leaf, 372; on Hop, 373*. 



Powdery Scab of Irish Potato, 340, 

 341*. 



Prairies, 508. 



Pressure within cells, 118. 



Primary endosperm nucleus, 40. 



Primary growth, 214. 



Primary leaves, 234. 



Primary meristems, 127. 



Primary rays, 203, 201*. 



Primary root, 102. 



Primary veins, 245. 



Procarp, 326, 326*. 



Processes in cell activity, 116. 



Promycelium, 394. 



Prop roots, 139. 



Propagation, by roots, 164^165; by 

 stems, 225-233. 



Prostrate stems, 172, 173. 



Proteases, 284. 



Protective tissues, 127. 



Protection against transpiration, 266. 



Proteins, 256, 281; kinds, 282. 



Prothallial cell, 456. 



Prothallus, 432, 432*. 



Protoascales (Yeasts), 377, 377*. 

 Protocoooales, 302; described, 307. 

 Protocoocus, 307. 

 Protodiscales, 364; described, 377, 



376*. 

 Protonema, 421. 

 Protoplasm, 39, 274; described, 113, 



114*- 

 Protoplast, 113. 

 Protozoa, 157. 

 Pruning, 221-225. 

 Pseudopodium, 423. 

 Pteridophytes, 292; described, 425- 



444. 

 Pteridosperms, 445. 

 Ptomaines, 286. 

 Pucdnia Asparagi, 403. 

 Pucdnia graminis, 396-401. 

 PuffbaUs, 382; described, 389-392. 

 Pulsating vacuoles, 303, 303*; in 



Euglena, 330, 330*. 

 Pimipkin, flowers, 12, 12*; length of 



root system, 135. 

 Pure line, 545. 



Purity and analysis of seeds, 74. 

 Pyrenoid, 303, 303*. 

 Pyrenomycetales, 364; described, 



369-373. 

 Pyronema, 367, 367* 



Quack Grass, 86. 

 Quarter-sawed Oak, 203, 202*. 

 Quetelet's law, 516, 517*, 518*, 519*- 

 Quince, 142. 

 Quinine, 286. 



Raceme, 28, 28*, 32*- 



RachiUa, 20, 21*. 



Rachis, 20, 20*, 21*. 



Radicle, of Bean, 56, 56*; of Corn, 63, 



102, 63*, 101*; development, 



466, 467, 466*, 467*. 

 Ranunculaceae, 481; flower, 481*. 

 Raphe, 57, 57*. 



Rays, primary and secondary, 203. 

 Receptacle, 12, 10*, 11*- 

 Recessive character, 544. 

 Red Algae, 296; described, 324^329. 



