INDEX 



515 



Poppies, 146, 371, 372, 439, 440, 



485 

 Poppy Family, 104, 438, 484, 485 

 Pore fungi, 431 

 Porphyra, 91 

 Potassium, 140 

 Potato, black scurf of, 432 



blight of, 414, 421 



scab of, 411, 432 



sweet, 149, 157, 158 



white, 149, 160, 161, 397 



wild, 70 

 Potato Family, 105, 158, 488 

 Powdery mildew, 424, 426 

 Prairie star, 443 

 Primrose, 451 

 Primrose Family, 105 

 Primrose willow, 451 

 Primus berry, 190 

 Privet, 479 



Proteins, 4, 115, 134, 135, 136 

 Prothallus, 57, 58, 59 

 Protococcus, 50 

 Protoplasm, 3, 14 

 Protozoa, 5 

 Prune, 198 

 Psyllium, 373 



Pteridopkyta, 86, 96, 108, 121 

 Pulp, ground wood, 319 



mills, 318 



soda, 320 



sulphate, 319 



sulphite, 319 



wood, 317 

 Pulque, 243 

 Pumpkin, 149, 190 

 Pussy toes, 459 

 Pyroxylin, 399 



Quebracho, 388 

 Quercitron, 389 



Quince, 145, 197 

 Quinine, 378 



Radicle, 75 

 Radish, 144, 146, 156 

 Raisin, 185 

 Ramie, 348 

 Ranunculaceae, 436 

 Raspberry, 148, 189 

 Rattan, 354 

 Rattlebox, 444 

 Ray flower, 71 

 Rayon, 320, 398, 399 

 Red ribbons, 452 

 Redbud, 475 



Redwood, 269, 314, 315, 316, 333 

 Redwood Family, 101, 314 

 Reforestation, 335 

 Reproduction, characteristics of, 

 85 



forest, 334, 335 



types of, 49 

 Resins, 383, 384 

 Respiration, 13, 26 

 Rhizoid, 31, 32, 33, 58, 59 

 Rhododendron, 330, 453, 479 

 Rhodophyta, 86, 90, 91, 108 

 Rhubarb, 159 

 Rice, 146, 176, 177, 397 



acreage, 177 

 Rocket, 441 

 Root, 32, 35, 38, 39, 118, 154 



cap, 38 



hair, 39, 40 



parasites, 417 

 Rosaceae, 445, 475 

 Rose Family, 104, 109, 193, 445, 



475 

 Rose of Sharon, 487 

 Roses, 70, 146, 147, 445, 446, 486 

 Rosin, 385 



