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