408 



Index 



Pine-family, 270 



Pine, Jersey, 275 



Pine, pitch, 275, 283 



Pine, pollen of, 287, 293 



Pine-sap, 99 



Pine, scrub, 275 



Pine, white, 281 



Pines, 299 



vitality of, 283 



Pinks, 139 



Pink family, 222, 225 



Pistil, 22, 29 



Pistillate flower, 77 



Pith, 102, 130, 132 



Plantago lanceolata, 359 



Plantago major, 357 



Plaintain, 128, 357 



Plaintain, flowers of, 359, 360 



Plumed fruits, 349 



Plum-leaves, 56 



Poison-ivy, 235 



Pollen, 22, 25, 26, 28 



Pollen-carriers, 30 



Pollen-grain, 24 



Pollen-grains of the honey- 

 suckle, 204 



Pollen-tube, 26, 27 



Pollen of " water-fertilized " 

 flowers, 30, 31 



Pollen of "wind-fertilized" 

 flowers, 30, 31 



Pollen of oat blossoms, 165 



Pollen of rushes, 185 



Pollen, waste of, 28, 3 



Polygamous flowers, 73 



Pond-weeds, 31 



Poplar, 31, 50, 51, 52, 54, 61, 

 73 



Poplars, 49, 51. 73, 75, 93 

 white, 53 



Populus alba, 50 



Potato, starch grains of, 103 



Potash, 367 



Prickles, no, 319, 323 



Prickles, how they differ from 

 thorns, 325, 326 



Prickly-ash, 74 



Primroses, diurnal, 228 



Primroses, evening, 228, 230 



Problems of nature, 345 



Procambium, 130 



Prof. Gray quoted, 83 



Prof, von Sachs quoted 367, 



368 



Proteids, 91 



Protoplasm, 90, 91, 100, 105 

 Prothalli, 251 



of adders' tongues, 252 



of club-mosses, 252 



of ferns, 252 



of gymnosperms, 292 



of horse-tails, 252 



of selaginellas, 292 

 Prothallus, 250, 258, 259, 298 



Rag-weed, 39, 350, 352 



Rape, 119 



Ray flowers, 352 



Red campion, 225 



Red cedars, 288, 296, 298 



Red maple, 54, 74 



Red maples, 75 



Red-top, 169 



Reed, 175 



Reeds, 175, 176 



Reptiles, age of, 285 



Resin, 282, 384 



Reversion to type, 136 



Revolving of vine-tips, 236,237 



Rib-wort, 357 



Ripple-grass, 359 



Rice, 118, 151 



blossom of, 172 



wild, 175 

 Richter (Jean Paul) quoted, 



230 



Rings in timber, 135 

 Rogue type, 98, 99 

 Rolled fronds of ferns, 260 

 Root-climbers, 234, 235 

 Root-hairs, 250, 388 

 Root-stocks, of ferns, 260 

 Root-stocks, of grasses, 152, 



153 



Root-tips, 388 

 Rose, 116, 117, 123, 128 

 Roses, 136 

 Rose-bush, 131 

 Rose-geranium, 126 

 Rose-kin, 126, 129, 132 

 Royal osmunda, 265 

 Rudiments, 80 

 Running mesquit, 153 

 Rush-lights, 180 



