INDEX 



441 



(fig.) ; habit of, 270 (fig.) ; 



sporogonium of, 282, 283 (fig.). 

 Pellionia, starch-formation in, 41 



42 (ng.). 

 Peltate hairs, 103 (fig.), 105; 



leaves, 115. 

 Peltigera, 259. 

 Pelvetia canaliculata, conceptacles 



of, 226, 269 ; habitat of, 202, 



203 ; thallus of, 203 (fig.). 

 Penicillium, 239 ; gonidia of, 242, 



243 (fig.)- 



Pentarch roots, 69, 71 (fig.). 



Pepper (Piper nigrum), 63. 



Peppermint (Mentha piperita), 62 ; 

 oil, 62. 



Pepsin, 52, 54, 57. 



Peptones, 52, 53. 



Perception of, gravity, 75, 78 ; 

 light, 95, 181. 



Perforations of vessels, 28, 35 (fig.), 

 83, 121. 



Perfumes, 62, 106. 



Perianth, 370. 



Periblem, 19, 20, 90, 95, 369. 



Pericarp, 370, 371 (fig.). 



Pericycle, 69, 78, 137 ; of aquatics 

 171 ; of Ferns, 292 (fig.) 

 of Lyginopteris, 328, 330 

 of roots, 66 (fig.), 68, 69, 70 

 (fig.), 71 (fig.), 131 ; of stems, 

 78, 118. 



Pericyclic fibres, 78 (fig.), 79, 80 

 (fig.), 87, .118 (fig.), 121 (fig.). 



Periderm (of Lyginopteris), 328. 



Peridineae, 406. 



Perigynous flowers, 355. 



Periodicity of Algae, 192, 211. 



Perisperm of Angiosperms, 371 ; 

 of Conifers, 352 (fig.). 



Peristome of Mosses, 285 (fig.), 

 286 ; mechanism of, 287. 



Perithecium, 241 (fig.), 242. 



Permanent mounting, 404, 405. 



Permeability of cell-walls, 9, 29, 

 31, 32, 36, 67, 71, 91, 93, 136. 



Permeability of cytoplasm, 9, 12, 

 13, 15 ; and guard-cells, 100 ; 

 and leaf-movements, 115 ; de- 

 monstration of, 12, 13. 



Peronospora parasitica, 243. 



Petals, 63, 103, 354, 373. 



Petiole, and leaf -fall, 141 ; move- 

 ment of, 115, 116; nectaries 

 on, 148; of Angiosperms, 113 

 (fig.), ^115; of Cycads, 322 ; of 

 Ferns', 295. 



Petrifactions, 328. 



Peziza, 231, 239 (fig.), 240 (fig.), 

 407. 



Phaeophyceae, 406 ; reproduction 

 of, 216, 218, 219 (fig.), 221 

 (fig.), 224-6 (fig.) ; structure 

 of, 198-204 (figs.), 208, 210. 



Phanerogamia, 307, 321, 334-73 

 (figs.), 407. 



Phaseolus multiflorus, 115, 371 ; 

 epidermis of stem of, 93, 94 

 (fig.) ; hydathodes of, 144, 

 145 (fig.), 147. 



Phelloderm, 135, 136 (fig.), 137, 

 138 (fig.), 139. 



Phellogen, 135-42 (figs.) ; and 

 aerenchyma, 175 ; of Conifers, 

 338, 339 (fig-)- 



Phenylhydrazine hydrochloride, 47, 

 401. 



Phloem, 28, 29 (fig.), 82 ; function 

 of, 28, 65, 88; secondary, 

 118, 119 (fig.), 120, 121 (fig.) 

 130, 134. 



Phloem of, aquatics, 171 (fig.), 172, 

 J 73 (fig.) ; Conifers, 339 (fig.), 

 340, 341, (fig.) ; Dicotyledons, 

 28, 29 (fig.), 65, 82 ; Ferns, 

 292 (fig.), 293 (fig.) ; leaves, 

 107, 112, 113; Monocotyle- 

 dons, 84, 85 (fig.), 86 ; parasi- 

 tic Angiosperms, 179 ; petioles, 

 IJ 3 (fig-) ; roots, 66 (fig.), 68, 

 69, 70 (fig.) ; stems, 76, 77 

 (fig.), 79, 81 (fig.), 82, 84 (fig.), 

 85 (fig.), 86, 118 (fig.). 



Phloem-bundles, 86. 



Phloem-parenchyma, 29 (fig.), 78 

 (fig.), 79, 82, 83, 84, 86, 88, 

 130, 132 ; of Conifers, 339 ; 

 of Ferns, 292 (fig.), 293 



(fig-). 



Phloroglucin, 402 ; and lignified 

 walls, 32. 



Phormium tenax, 34. 



Phosphorescence of meat, 265. 



Photosynthesis. See Carbon dioxide 

 assimilation. 



Phototaxis, 183, 214. 



Phragmidium bulbosum, 248. 



Phycomycetes, 231-8 (figs.), 240, 

 243, 406. 



Phylogeny, 210, 396. 



Physiology of, cells, 8-15 ; Bac- 

 teria, 261, 263, 264-7 I Fungi, 

 55, 72, 100, 252-7. 



Phytophthora infestans, 230, 231, 

 253, 254 ; structure and repro- 

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



