970 



INDEX. 



613. 



,239. 



Propagation by leaf-cuttings, iu 41. 



— by offshoots, ii. 790. 



— kinds of, ii. 6. 

 Protandrous dichogamy, ii. 309. 



— flower, ii. 307. 



— plants and hybridization, ii. 317. 

 ProteacesB, and animals, i. 432. 



— Australian, summer sleep, 1. 326. 



— follicle, ii. 430. 



— pollen-grains, ii. 99. 



— position of leaf-blades in many, i. 335. 



— storage of pollen, ii. 94. 



— sweeping hairs, ii. 615. 

 Proteales, ii. 751. 



— description, ii. 750. 



Protea mellifera, Australia, protection of 

 stomata from moisture, i. 296. 



cuticular ramparts, i. 310. 



stomata, surface view and section, i. 



297. 



Protection, from loss of heat, i. 528. 



— of bulbs, i. 624. 



— of chlorophyll, i. 391. 



— of cotyledons in germination, i 



— of embryo, ii. 442, 601. 



— of flowers, by sticky glands, ii. 

 by tufts of hair, ii. 240. 



— of honey, by intrar-floral hairs, 



various contrivances, ii. 233. 



various devices, ii. 241. 



— of leaves, against mechanical injury, i. 



428. 



— of plants, against animals, i. 430. 

 by snow, i. 548. 



by spines, &c., i. 433. 



— of pollen, ii. 117. 



— of pollen from wet, ii. 106, 109. 



— of ripening seeds against animals, ii. 444. 



— of seeds against wet, ii. 448. 



— of spermatoplasm and ooplasm, ii. 72. 



— of sporangia, ii. 13. 



— of underground roots from vermin, &c., 



i. 762. 

 Protective contrivances, and distribution, i. 

 450. 



and loss of heat, i. 529. 



of developing leaves, i. 348. 



— envelopes of young green leaves, i. 351. 



— isolation of plants by water, ii. 233. 



— poisons of plants, i. 431. 

 Proteid-grauules, in endosperm, ii. 421. 

 Prothallium, female, of Hydropterides, ii. 



710. 



— of Equisetum, ii. 712. 



— of Fern, ii. 472. 



— of Lycopodium annotinum, ii. 716. 



— young, arising from spore, ii. 472. 

 Prothallus, Fern, habit of, i. 88. 

 Protococcoidese, as Lichen-algse, ii. 692. 



— description, iL 628 et seq. 

 Protococcus atlanticus, reddening of sea, i. 



389. 

 Protozoa afford examples of simplest type 

 of reproduction, ii. 630. 



— and Myxoraycetes, ii. 619. 

 Protogynous dichogamy, ii. 309. 



— flower, ii. 307. 



— plants and hybridization, ii. 316. 

 Protomycetes, ii. 674. 

 Protonema, of Moss, ii. 701, 799. 



— of Sohistostega, PI. I. 

 luminosity, i. 385. 



Protoplasm, and freezing to death, i. 552. 



— continuity, and transmission of stimuli, 



i. 536. 



— essential part of cell, i. 26. 



— formative activity, i. 572. 



— importance in assimilation, i. 456. 



— in cell-wall, i. 581. 



— inclosed in cells, i. 25. 



— motion within cell-cavities, i. 32. 



— movements and chlorophyU-granules, ii. 



382. 



— rate of current, i. 34. 



— resisting capacity, i. 553. 



— selective absorption due to specific con- 



stitution, i. 73. 



Protoplasm, specific constitution, ii. 487. 



— structure, i. 511, 569. 



— theories of origin, ii. 597. 



— vehicle for oxygen, i. 495. 



— vitality, i. 51. 

 and cold, i. 544. 



Protoplasmic strands, cond\icting function, 



i. 466. 

 Protoplast, definition of term, i. 26. 



— division of labour within, i. 466. 

 Protoplasts, amoeboid, i. 31. 



— chlorophyll corpuscles in, i. 30. 



— ciliated, general behaviour, i. 30. 



— green, behaviour towards light, i. 30. 



— mode of life, i. 27. 



— mutual and external relations, i. 47. 



— power of renovation, ii. 45. 



— problem of mutual intelligence between, 



i. 49. 



— sorts of, 1. 28. 



Prunella, distribution of sexes, ii. 298. 



— honey protection, ii. 241. 



— hybrids, ii. 585. 

 Pruning, object of, ii. 37. 



Prunus, host of Polystigma rubrum, ii. 678. 



Prunus armeniaca, section, i. 22. 



Prunus avium, dates of flowering, i. 519. 



drupe, ii. 428. 



Prunus cerasus, cotyledons, i. 608. 



Prunus communis, nectary, ii. 174. 



Prunus insititia, &c., galls of Exoascus Pruni, 

 ii. 524. 



Prunus Mahaleb, reserve-buds, ii. 33. 



Prunus Padus, ii. 524. 



Prunus spinosa, drupe, ii. 428. 



spines, i. 443. 



Pnissic acid, i. 462. 



Pseudo-hermaphrodite flowers and dichog- 

 amy, ii. 312. 



Pseudomorphs, Orobanche formerly con- 

 sidered, i. 185. 



Psilotacese, description, ii. 715. 



— horaosporous, ii. 713. 

 Ptarmigans, in Alps, i. 489. 



Ptelea trifoliata, flowers, sexual conditions, 

 ii. 296. 



seed-dispersal, ii. 853. 



Pteranthus eohinatus, hooked fruit, ii. 873. 

 Pteridese, tribe of Polypodiacese, ii. 706. 

 Pteridophyta compared to Bryophyta, ii. 704. 



— general description, ii. 704. 

 Pterocarya, mode of fertilization unknown, 



ii. 413. 

 Pterocarya Caucasica, cotyledons, i. 621. 

 Pterogouium gracile, parthenogenesis, ii. 



464. 

 Puccinia graminis, effect on Wheat crops, ii. 



life-history, ii. 686. 



Puff-balls. See Lycoperdon. 

 Pulmouaria, autogamy, ii. 396. 



— heterostyly, ii. 302. 



— protection of pollen, ii. 118. 



— venation, i. 630. 



Pulmonaria hybrida, characteristic hairs, ii. 



561. 

 Pulmonaria Lithospermum, flower colour 



and surroundings, ii. 194. 

 Pulmonaria officinalis, winter protection, i. 



550. 

 Pulque, i. 507. 



— fermented juice of Agave Americana, i. 



272. 



Pulsatilla, hybrids, ii. 584. 



Pulsatilla patens, protogyny and hybridiza- 

 tion, ii. 316. 



Pulsatilla pratensis, colour of sepals, ii. 183. 



Pulsatilla vernalis, distribution of sexes, ii. 

 298. 



— nectaries, ii. 179. 



Pulvinus, of leaf, function, i. 532. 

 Purification, due to Bacteria, i. 264. 

 Purple Loosestrife. See Lythrnm Salicarla. 

 Putrefaction, and Moulds, i. 507. 



— by Bacteria, ii. 623. 



— nature and causes of, substances gener- 



ated during, i. 263. 



Putrefaction, nature of, i. 506. 

 Pycnidia, of Lichens, ii. 693. 



— of Pyrenomycetes, ii. 678. 

 Pyrenoid, function, ii. 629. 



— of Chlaraydomonas, ii. 629. 

 Pyrenoids, in Spirogyra, ii. 656. 



— of Hydrodictyon, ii. 640. 

 Pyrenolichenes, characters, ii. 694. 

 Pyrenomycetes, as Lichen-fungi, ii. 693. 



— distinctive characters, ii. 676. 

 Pyrola, dehiscence of pollen-sacs. ii. 92. 

 Pyrola chlorantha, capsules in dry and wet 



weather, ii. 448. 

 Pyrola media, autogamy, ii. 364. 

 Pyrola secunda, pollen - sprinkling, ii. 273, 



274. 

 Pyrola uniflora, flower and autogamy, ii. 

 383. 



scent, ii. 202. 



stamen, ii. 91. 



water-receptacles, i. 239. 



Pyrolaceae, ii. 768. 

 Pyrus, carpels, ii. 76. 



— hybridization in, ii. 570. 



— scent, ii. 200. 



Pyrus aucuparia, and Gymnosporangium 



juniperinum, ii. 686. 

 Pyrus communis, dates of flowering, i. 519. 



grafting on Crataegus Oxyacantha, &c., 



ii. 571. 



Gymnosporangium gall, ii. 520. 



persistent receptacle, ii. 435. 



Pyrus cydonia, mucilaginous seed-coat, i. 458. 

 Pyrus malus, carpels, ii. 76. 



host of Mistletoe, i. 205. 



ovary, sections, ii. 74. 



Pyrus salicifolia, erroneous assertions about 



origin, i. 215. 

 Pythium, germination, ii. 669. 

 Pythium de Baryanum, on seedlings, ii. 670. 



Q. 



Quamoclit coccinea, cotyledons, i. 621. 

 Quartz attacked by Lichens, i. 257. 



— difficult to decompose, i. 83, 266. 

 Quassia amara, flowering branch, ii. 778. 

 Queen of the Night. See Cereus nycticalus. 

 Quercus, i. 716 ; ii. 760. 



— and bud-galls of Andricus inflator, ii. 543. 



Of Aphilothrix gemmaj, ii. 541. 



of Aphilothrix Sieboldi, ii. 537, 541. 



of Cynips Hart igii, ii. 541. 



of Cynips lucida, ii. 541. 



of Cynips polycera, ii. 541. 



of Dryoterus terminalis, ii. 543. 



of Neuroterus fumipennis, ii. 537. 



of Neuroterus numismatus, ii. 537. 



of Spathegaster baccarum, ii. 526. 



— and grazing animals, i. 445. 



— and Peziza aeruginosa, ii. 682. 



— and solid gall of Cynips Kollari, ii. 541. 



— bark, i. 720. 



— cotyledons, i. 608; ii. 421. 



— curvature of branches, i. 416. 



— defoliation slow, i. 361. 



— fertilization porogamic, ii. 413. 



— fossil, i. 636. 



— from chalk, ii. 613. 



— galls on roots, ii. 541. 



— germination, i. 609. 



— mechanical tissue arrangement, i. 729. 



— monoecious, ii. 297. 



— numerous hybrids, ii. 583. 



— nut-gall of Cynips calicis, ii. 543. 



— phyllotaxis, i. 399. 



— pollen-grains, ii. 99, 102. 



— pollination, ii. 133, 135. 



— protogynous, ii. 313. 



— scale-leaves of first bud, i. 624. 



— stomata, i. 280. 



— tannin of wood and nutrition of Mildew, 



i. 166. 



— variety in foliage, ii. 471. 



— vernation, i. 350. 



Quercus Austriaca, seedlings, i. 607. 



