444 



INDEX 



Conifers, 348, 349 (fig.) ; 

 Cycads, 325 (fig.), 326, 327 

 (fig.) ; Equisetum, 313 ; Ferns, 

 299 (fig.), 300-302 (fig.), 304, 

 35, 3 Z 3 ', Lycopodium, 316 

 (fig.) ; Lyginopteris, 330, 331 ; 

 Selaginella, 319, 320 (fig.), 321. 



Protococcus (Hcematococcus), 186. 



Protonema, 287 (fig.), 288. 



Protophloem, 90. 



Protoplasm, 2, 3 ; composition of, 

 2, 50 ; growth of, 25 ; move- 

 ment of, 4, 6 ; permeability 

 of, 9, 12, 13, 15 ; properties 

 and structure of, 3, 4. 



Protoplasmic connections, 24, 30, 

 190. 



Protoplast, 2, 3. 



Protoxylem, 36, 68, 89 ; of Cycads, 

 322 ; of Ferns, 292 (fig.), 293 ; 

 of leaf, 112, 114; of Lyginop- 

 teris, 328 ; of root, 66 (fig.), 68, 

 69, 70 (fig.), 318, 341 ; of stem, 

 78 (fig.), 79, 80 (fig.), 81 (fig.), 

 83 (fig.), 84 (fig.), 85 (fig.)', 86, 

 n8 (fig.). 



Protoxylem canal, 85 (fig.), 86. 



Prussic acid, 48 ; and enzyme- 

 action, 56. 



Psamma arenaria, leaf-structure of, 

 92, 163, 164 (fig.). 



Pseudomonas, 262, 263 (fig.). 



Pseudotsuga douglasii, 128, 129 ; 

 cone of. 352 (fig.), 353. 



Psilophytales, 407. 



Psilotum, 407. 



Psychotria ipecacuanha, 61. 



Pteridophyta, 289-321 (figs.), 333, 



334, 355, 37. 373, 47- 



Pteridosperms, 327-33 (figs.), 334, 

 407. 



Pteris aquilina, extrafloral nec- 

 taries of, 148, 149 (fig.) ; habit 

 of, 289, 290 (fig.) ; leaf of, 60, 

 112, 169, 291, 295 ; rhizome of, 

 290 (fig.), 292-4 (figs.) ; sori 

 of, 296 (fig.). 



Ptomaines, 61. 



Puccinia anemones, 247, 248 ; P. 

 graminis, 245-7 (fig.) ; P. mal- 

 vacearum, 248, 253. 



Puff-ball (Lycoperdon), 245, 250, 

 251 (fig.), 407. 



Pulling-strains, resistance to, in 

 aquatics, 88, 170 ; in roots, 72. 



Pulses, 43. 



Pulvinus, structure of, 115, 116 

 (fig-). 



Pure cultures (of Bacteria), 264 ; 

 - lines, 377, 378. 



Purine-derivatives, 61. 



Purple Dead-nettle (Lamium pur- 

 pureum], 364 ; Loosestrife 

 (Lythrum salicaria), 174. 



Putrefaction, 265. 



Pyrenoids, 7 (fig.), 8, 181, 182 (fig.), 

 187 (fig.), 196 (fig.), 207, 208, 

 209 (fig.), 217 (fig.), 227 (fig.). 



Pyrenomycetes, 407. 



Pythium debaryanum, 231, 252, 

 253, 406 ; structure and life- 

 history of, 234, 235 (fig.), 236. 



Qualitative variations, 374, 375 



(fig.), 376 (fig.). 

 Quantitative variations, 374. 

 Quercus, 130, 364 ; bark of, 60, 



141 ; cork of, 140 ; wood of, 



28, 35 (fig-), 122, 128 (fig.). 

 Quercus intermedia, 389 ; Q. suber, 



140. 



Quillaia-ba.r'k., 48. 

 Quillwort (Isoetes lacustris], 314, 



315 (fig-)- 

 Quinine, 61. 



Radiation, prevention of, 138. 



Radicle of, Angiosperms, 369 (fig.), 

 370, 371 (fig.) ; Conifers, 350, 

 351 (fig-), 352 (fig.) ; Cycads, 

 326; Selaginella, 320 (fig.). 



Raffia-tape, 34. 



Rainfall and plant-distribution, 391. 



Raising of stomata, 96, 160 (fig.), 

 161, 162, 170. 



Ramentum (of Ferns), 291 (fig.). 



Rancidity of butter, cause of, 265. 



Rammculaceae, 60, 354, 357. 



Ranunculus aquatilis, 177 (fig.) ; 

 R. auricomus, 92 (fig.) ; R. 

 repens, 66. 



Raphe (of anatropous ovules), 357 

 (fig-), 358 (fig.). 



Raphia, 35. 



Raphides, 58, 59 (fig.). 



Rattle, Yellow (Rhinanthus] , hyd- 

 athodes of, 144, 145 (fig.). 



Rays, of Conifers, 340, 341 (fig.) ; 

 of Lyginopteris, 328, 330 (fig.) ; 

 of root, 132 ; of secondary 

 phloem, 130 ; of secondary 

 wood, 119 (fig.), 120, 122-4 

 (fig.), 128 (fig.) ; primary , 

 76, 77 (fig.), 78 (fig.), 118. 



Reactions of, alkaloids, 61 ; cal- 

 lose, 82 ; cellulose, 4, 31, 32 ; 



