456 



INDEX 



Nodes, 1 86 



Nuclei, 31, 33, 34, 40, S5. 62, 66 



Nutation, 187 



Oak, swamp white, 192 



Oat, rusts, 69 ; smut, 386, 387 



Odors of flowers, 361 



Oils, essential, 324; fatty, 320—322; 



volatUe, 324 

 Opuntia, 204 

 Orange, 285 

 Orchid famUy, 300 

 Orchids, epiphytic, 183 

 Ovary, 8, g, 137, 144, 159, 160 

 Ovules, 8, 123, 124, 126, 128, 144, 



145, 160 



Palisade layer, 139 

 Palm family, 297 

 Pandanus, 175 

 Panicle, 266 

 Parasitic bacteria, 12 

 Parasitic fungi, 60, 80, 85 

 Parasitic seed plants, 179-181 

 Parsley family, 307 

 Pasteurization of milk, 20 

 Peach scab, 388 

 Pear blight, 374 

 Pear rust, 73 

 Peas, 27, 153 

 Peat mosses, 94 

 Pedicels, 141, 264 

 Peduncles, i4r, 264 

 Pepper, 323 



Perennial plants, 177, 22r, 331 

 Perfumes, 323 

 Petals, 8, 9, 142, 148, 260 

 Phaseolus acutifoUus, 155 

 Phaseolus liinaliis, 154, 155 

 Phaseolus multijlorns, 154, 155 

 Phaseolus radial us, 155 

 Phaseolus vulgaris, 154, 155 

 Phycomyccs, 59 

 Pigeon grass, 329 

 Pilobohis, 59 



Pine, blister rust, 72 ; comparison 

 with bean, 153 ; long-leaved yel- 

 low, 352; red (Norway), 352, 

 356; white, 348, 349, 352 



Pineapple, 284 



Pines, II 3-1 3 6 



Pink family, 303 



Pinus Lambertiana, 133 



Pin us pahislris, 352 



Pinus resinosa, 133 



Pinus strobus, 132 



Pistils, 8, 141, 144, 1S9, 160, 263; 

 rudimentary, 9, 160, 161 



Pitcher plants, 236, 237 



Pith, 115, ii5, 138, 196, 211 



Plankton, 51 



Plant breeding, 358-372 



Plant diseases, 373-389 



Plant products, 313-327 



Plum black knot, 383 



Pod of bean, 144, 151, 152 



Poison hemlock, 337 



Poison ivy, 340 



Poison oak, 340 



Poisonous plants, 80, 81, 337-341 



Pollen, 9, 268; as food for insects, 

 272; of bean, 143, 144, 148; of 

 cucumber, 9 ; of Indian com, 161 ; 

 of lily, germination, 143 ; of pine, 

 122, 123; of pine, germination, 

 125; sacs, 122, 123, 161; tube, 

 9, 126, 129, 143, 147, 148, 149 



Pollination, 266-280; of bean, 146- 

 148 ; of Indian corn, 162 ; of pine, 

 125, 126, 129 



Polygonalum, 199 



Pond scums, 39 



Potato, 314, 358; early blight, 388, 

 389; late blight, 380; rot, 380; 

 scab, 387 ; tubers, 202 



Powdery mildews, 382 



Pressure, influence on growth, 185 



Prickles, 220 



Prickly lettuce, 240 



Primrose, flowers, 278, 279; leaf 

 mosaic, 239 



