438 



INDEX TO SUBJECTS. 



Plants, principal groups of 270 



Pleurocarpi 045 



Plocamium 305 



Polar origin of plants 399 



Pollen 7 9 



" forms of 70 



" of Angiosperms 375 



" " Con^feraj 370 



" " Gymnosperms 366 



" prepotency of foreign 94, 95 



Pollen-sacs, nature of 364 



Pollen, structure of 79 



Pollen-tube 80, 100, 101 



Pollinia 80 



Pollination 88 



" effects of. 104 



Polycarpicas 387 



Polyporeae 326 



Pore-canals 155 



Potassium hydrate. . 208 



Prefloration (jj 



Prefoliation ™ 



Primary meristem 168 



Primordial utricle 127 



Primulineae . . . 386 



Principal groups of plants 270 



Pro-embryo 102 



" of Chara 300 



Pro-mycelium of Smut-fungi 310 



Prosenchymatous tissues 158 



Protandrous flowers 91, 92, 93 



Proterogynous flowers .* 93, 94 



Proteid, how it differs from protoplasm. 132 



Prothallium of Angiosperms 376 



, " " Coniferae 372 



" " Equisetineae 349 



" " Ferns 346, 352 



" " Lycopodiaceae 357 



" " Marsilea 357 



" " Rhizocarpeae 356 



" " Seed-plants 364 



Protococcaceae 285 



Protonema of Mosses 336, 339, 342 



Protoplasm 132 



" continuity of from cell to cell 256 



" microsomes in 133 



" modifications of 733 



" properties of. 220 



Psilophytons 392 



Psilotaceas 359 



Psilotum 359 



Pteridophyta, classes of 347 



" classification of 345 



" carboniferous 393 



Devonian 392 



" general characters of 345 



Pteridophyta, reproduction of 346 



Puccinia graminis, life history of.. 321, 



322. 323 



Putrefaction, cause of 277 



Pyrenomycetes 3I 6 



QUATERNARY, plants of the 396 



DADIAL bundles 177, 377 



Rafllesi^, flower of 91 



Receptacle 69 



Red Marine Algas 304 



Reindeer Lichen 33 j 



Rejuvenescence of cells 150, 292 



Reproduction 221, 257 



" asexual 257 



organs of. 50 



sexual 257 



" vegetative 257 



Reproductive organs 3, 51 



Resemblance between plants and ani- 

 mals 221, 224 



Resin-cells 168 



Resins 139 



Respiration? 221 



Reticulate venation 195 



Rhizocarpeae 355 



Paleozoic 391 



Rhizoids , 182 



" of Characeas 297 



Thallophyta 271 



Rhizomes distinction from roots 14 



Rhodophyceae 304 



Riccias 340 



Rings of growth 190 



Rivulanaceae 280 



Root, central cylinder of 180 



" cortex of. 180 



" definition of. 4 



" epidermis of 180 



" histology of 179 



" how it differs from the stem 5 



" uses of. 4 



Root-branches, origin of 182 



Root-cap, use of 6 



Root-hairs 180 



Root-pressure 231 



Roots, absorbing sur ace of 6 



" absorption by 230 



" classification of forms of 6 



" of Club mosses 357 



Dicotyledons 382 



Epiphytes 5 



Monocotyledons 7, 377 



parasites 5 



