512 



INDEX. 



Pimpernel. Sec Anagallis. 



Pinnularia viridis, structure, 255 (fig. 

 97) ; division, 257 ; movements, 

 258 ; skeletonisation, 258. 



Pinus sylvestris, bordered pits, 74 (fig. 

 27) ; embryo-sac and embryo, 375 

 (figs. 137-9) ; female flower, 370 

 (fig. 135) ; fertilisation, 372 ; male 

 flower, 367 (fig. 134); ovule, 371 

 (fig. 136) ; pollination, 371 ; resin 

 canals, 144 (fig. 53) ; stamens, 368 

 (fig. 134) ; sieve-tubes, 147 (figs. 

 55, 57) ; structure of stem, 137 

 (figs. 50-7). 



Pipettes, xxxi. 



Piptocephalis Freseniana, 317. 



Pistil, 394 ; origin of in Brassica, 

 432. 



Pisum sativiim, aleurone grains, 28 

 (fig. 11) ; structure of seed, 27 

 (fig. 11). 



Pith, 68, 102, 121. 



use of, in section-cutting, 82, 205. 

 Pits, bordered, of Pinus sylvestris, 74 



(fig. 27); unilaterally bordered, 

 110 (fig. 47) ; closing membrane, 

 73, 76 (figs. 26, 27). 

 - branched, in pear, 65 (fig. 23). 



reactions of pit-surfaces, 64, 65 ; 



torus, 76 (fig. 26). 



sieve. See sieve-tubes, sieve-plates, 



etc. 



simple, in Agaricus campestris, 230 



(fig. 94) ; Beta vulgaris, 63 ; Orni- 

 thogahim, 73 (fig. 26) 



use of, in section-cutting, 82. 

 Pitted ducts, 103, 110 (fig. 40), 91. 



See also pits. 



Placenta, 356 (fig. 130), 395 (fig. 144) ; 

 axile, 396 ; free central, 397 ; 

 marginal, 393. 



of Aspidium, 356. 

 Plasmolysis, 252-3, 267, 276 ; in 



staminal hairs of Tradescantia, 

 45 ; movement during, 49. 



Plaster of Paris, case, 279; plates, 

 289. 



Plate cultures, of bacteria, 284. 



Pleomorphism (in bacteria), 269. 



Plerome, 211 (figs. 82, 83), 220 (fig. 

 87) et seq., 379 (fig. 139), 416, 420. 



Pleurococcus vulgaris. See Protococ- 

 cus viridis. 



Pleurosigma angulatum (as test ob- 

 ject), 259. 



Plum. See Prunus domest'ica. 



Plum-juice, use of, 317, 318. 



Plumule, 410, 415 (fig. 150), 420. 



Polarisation of starch, 22 ; of inuline, 

 70 ; of mucilages, 429. 



Polariscope, use of, 22, 64. 



Pollen-grains, structure or develop- 

 ment, in Acacia, 391 ; Agct pan- 

 thus, 385 ; Althcea rosea, 388 ; 

 Azalea, 391 ; Calluna vulgaris^ 

 391 ; Cucurbita, 390 ; Erica, 320; 

 Fritillaria imperialis, 386 ; Fun- 

 kia, 385 ; Hemerocallis fulva, 381 

 (fig. 140) ; Hyacinth, 385 ; Iris, 

 385 ; Leucojum, 386 ; Lilium* 



385 ; Malva 'crispa, 388 (fig. 142) ; 

 Mimosese, 320 ; CEnotJiera bienms, 



386 ; Pinus sylvestris, 369 (fig. 

 134) ; Rhododendron, 391 ; Trades- 

 cantia virginica, 385 (fig. 141). 



compound, 391. 



culture and germination of, 391. 



homology with microspores, 

 369. 



how to make transparent, 388, 



390. 



to cut sections of, 389. 



mother-cells, division of, in Fritil- 



laria per 'sic,438 (fig. 154); Hemero- 

 callis, 384 (fig. 140); Helleborns 

 fcetidus, 443 (fig. 155). 



- passage, in style of Hemerocallis, 



396. 



sacs of Pinus xi/lvestris, 368 (fig. 



134); of angiosperms, 380. See 

 also pollen-grains. 



homology with microsporaugia, 



369, 380. 



- tubes, development of, 373, 374, 



387, 407, 408; cultural develop- 

 ment, 391. 



Pollination (in Pinus), 371 ; in orchids,. 

 404 ; in Torenia, 406. 



Polycarpous. See apocarpous. 



Polyemoryony, in Picea, 378. 



Polymorphism. See pleomorphism. 



Polypodiacese, 357. 



Polypodium vulgare, prothallium, 357 ; 

 antheridia, 358 (fig. 131) ; sper- 

 matozoids, 359 (fig. 132) ; arche- 

 gonium, 360 (fig. 133) ; fertilisa- 

 tion, 360. 



Polypody fern. See Polypodium. 



Polystelism, 173. 



Polytrichum juniper inum, antheridia, 

 346. 



foliar bundles in, 230. 

 Pomese, epidermal cork in, 187. 

 Poplar-wood, use of, in cutting sec- 

 tions, 409. 



Poppy. See Papaver. 

 Pore-canals, of pear, 65 (fig. 23). 

 Porous cells of Sphagnum, 231. 

 Potash, acetate, use of, 216. Sec also- 

 Appendix III. 



bichromate, reagent for tannin, 71,. 



149. 



