Natural selection in connection with geotropism, heliotropism, etc., 570

Nephrodium molle, circumnutation of very young frond, 66 --, of older frond, 257 --, slight movement of fronds, 509

Neptunia oleracea, sensitiveness to contact, 128 --, nyctitropic movement of leaflets, 374 --, of pinnae, 402 [page 585]

NICOTIANA--OXALIS

Nicotiana glauca, sleep of leaves, 385, 386 --, circumnutation of leaves, 386

Nobbe, on the rupture of the seed-coats in a seedling of Martynia, 105

Nolana prostrata, movement of seedlings in the dark, 50 --, circumnutation of seedling, 108

Nyctitropic movement of leaves, 560

Nyctitropism, or sleep of leaves, 281; in connection with radiation, 286; object gained by it, 413

O.

Observation, methods of, 6

Oenothera mollissima, sleep of leaves, 383

Opuntia basilaris, conjoint circumnutation of hypocotyl and cotyledon, 44 --, thickening of the hypocotyl, 96 --, circumnutation of hypocotyl when erect, 107 --, burying of, 109

Orange, seedling, circumnutation of, 510

Orchis pyramidalis, complex movement of pollinia, 489

Oxalis acetosella, circumnutation of flower-stem, 224 --, effects of exposure to radiation at night, 287, 288, 296 --, circumnutation and nyctitropic movement in full-grown leaf, 326 --, circumnutation of leaflet when asleep, 327 --, rate of circumnutation of leaflets, 404 --, effect of sunshine on leaflets, 447 --, circumnutation of peduncle, 506 Oxalis acetosella, seed-capsules, only occasionally buried, 518 -- articulata, nocturnal movements of cotyledons, 307 -- (Biophytum) sensitiva, rapidity of movement of cotyledons during the day, 26 --, pulvinus of, 113 --, cotyledons vertical at night, 116, 118 -- bupleurifolia, circumnutation of foliaceous petiole, 328 --, nyctitropic movement of terminal leaflet, 329 -- carnosa, circumnutation of flower-stem, 223 --, epinastic movements of flower-stem, 504 --, effect of exposure at night, 288, 296 --, movements of the flower-peduncles due to apogeotropism and other forces, 503-506 -- corniculata (var. cuprea), movements of cotyledons, 26 --, rising of cotyledons, 116 --, rudimentary pulvini of cotyledons, 119 --, development of pulvinus, 122 --, effect of dull light, 124 --, experiments on leaves at night, 288 -- floribunda, pulvinus of cotyledons, 114 --, nocturnal movement, 118, 307, 313 -- fragrans, sleep of leaves, 324 -- Ortegesii, circumnutation of flower-stems, 224 --, sleep of large leaves, 327 --, diameter of plant at night, 402 --, large leaflets affected by bright sunshine, 447 -- Plumierii, sleep of leaves, 327 -- purpurea, exposure of leaflets at night, 293 -- rosea, circumnutation of cotyledons, 23, 24 [page 586]

OXALIS--PHASEOLUS

Oxalis rosea, pulvinus of, 113 --, movement of cotyledons at night, 117, 118, 307 --, effect of dull light, 124 --, non-sensitive cotyledons, 127 -- sensitiva, movement of cotyledons, 109, 127, 128 --, circumnutation of flower-stem, 224 --, nocturnal movement of cotyledons, 307, 312 --, sleep of leaves, 327 -- tropoeoloides, movement of cotyledons at night, 118, 120 -- Valdiviana, conjoint circumnutation of cotyledons and hypocotyl, 25 --, cotyledons rising vertically at night, 114, 115, 117, 118 --, non-sensitive cotyledons, 127 --, nocturnal movement of cotyledon, 307, 312 --, sleep of leaves and not of cotyledons, 315 --, movements of leaves, 327

P.

Pachira aquatica, unequal cotyledons, 95, n.

Pancratium littorale, movement of leaves, 255

Paraheliotropism, or diurnal sleep of leaves, 445

Passiflora gracilis, circumnutation and nyctitropic movement of leaves, 383, 384 --, apogeotropic movement of tendrils, 510 --, sensitiveness of tendrils, 550 Pelargonium zonale, circumnutation of stem, 203 --, and downward movement of young leaf, 232, 233, 269

Petioles, the rising of beneficial to plant at night, 402

Petunia violacea, downward movement and circumnutation of very young leaf, 248, 249, 269.

Pfeffer, Prof., on the turgescence of the cells, 2; on pulvini of leaves, 113, 117; sleep movements of leaves, 280, 283, 284; nocturnal rising of leaves of Malva, 324; movements of leaflets in Desmodium gyrans, 358; on Phyllanthus Niruri, 388; influence of a pulvinus on leaves, 396; periodic movements of sleeping leaves, 407, 408; movements of petals, 414; effect of bright sunshine on leaflets of Robinia, 445; effect of light on parts provided with pulvini, 363

Phalaris Canariensis, movements of old seedlings, 62 --, circumnutation of cotyledons, 63, 64, 108 --, heliotropic movement and circumnutation of cotyledon towards a dim lateral light, 427 --, sensitiveness of cotyledon to light, 455 --, effect of exclusion of light from tips of cotyledons, 456 --, manner of bending towards light, 457 --, effects of painting with Indian ink, 467 --, transmitted effects of light, 469 --, lateral illumination of tip, 470 --, apogeotropic movement of the sheath-like cotyledons, 497 --, change from a straight upward apogeotropic course to circumnutation, 499 --, apogeotropic movement of cotyledons, 500

Phaseolus Hernandesii, nocturnal movement of leaves and leaflets, 368 --, caracalla, 93 --, nocturnal movement of leaves, 368 --, effect of bright sunshine on leaflets, 446 [page 587]

PHASEOLUS--QUERCUS

Phaseolus multiflorus, movement of radicles, 29 --, of young radicle, 72 --, of hypocotyl, 91, 93 --, sensitiveness of apex of radicle, 163-167 --, to moist air, 181 --, cauterisation and grease on the tips, 535 --, nocturnal movement of leaves, 368 --, nyctitropic movement of the first unifoliate leaves, 397 -- Roxburghii, effect of bright sunshine on first leaves, 445 --, vulgaris, 93 --, sleep of leaves, 318 --, vertical sinking of leaflets at night, 368

Phyllanthus Niruri, sleep of leaflets, 388 -- linoides, sleep of leaves, 387

Pilocereus Houlletii, rudimentary cotyledons, 97

Pimelia spectabilis, sleep of leaves, 387

Pincers, wooden, through which the radicle of a bean was allowed to grow, 75

Pinus austriaca, circumnutation of leaves, 251, 252 -- Nordmanniana, nyctitropic movement of leaves, 389 -- pinaster, circumnutation of hypocotyl, 56 --, movement of two opposite cotyledons, 57 --, circumnutation of young leaf, 250, 251 --, epinastic downward movement of young leaf, 270

Pistia stratiotes, movement of leaves, 255

Pisum sativum, sensitiveness of apex of radicle, 158 --, tips of radicles cauterised transversely, 534

Plants, sensitiveness to light, 449; hygroscopic movements of, 489

Plants, climbing, circumnutation of, 264; movements of, 559 --, mature, circumnutation of, 201-214

Pliny on the sleep-movements of plants, 280

Plumbago Capensis, circumnutation of stem, 208, 209

Poinciana Gilliesii, sleep of leaves, 368

Polygonum aviculare, leaves vertical at night, 387 -- convolvulus, sinking of the leaves at night, 318

Pontederia (sp.?), circumnutation of leaves, 256

Porlieria hygrometrica, circumnutation and nyctitropic movements of petiole of leaf, 335, 336 --, effect of watering, 336-338 --, leaflets closed during the day, 413

Portulaca oleracea, effect of Aecidium on, 189

Primula Sinensis, conjoint circumnutation of hypocotyl and cotyledon, 45, 46

Pringsheim on the injury to chlorophyll, 446

Prosopis, nyctitropic movements of leaflets, 374 Psoralea acaulis, nocturnal movements of leaflets, 354

Pteris aquilina, rachis of, 86

Pulvini, or joints; of cotyledons, 112-122; influence of, on the movements of cotyledons, 313; effect on nyctitropic movements, 396

Q.

Charles Darwin

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