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.

Quercus (American sp.), circumnutation of young stem, 53, 54 —­ robur, movement of radicles, 54, 55 —­, sensitiveness of apex of radicle, 174-176 [page 588]

QUERCUS—­SACHS