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

Quercus virens, manner of germination, 85, 557

R.

Radiation at night, effect of, on leaves, 284-286

Radicles, manner in which they penetrate the ground, 69-77; circumnutation of 69; experiments with split sticks, 74; with wooden pincers, 75; sensitiveness of apex to contact and other irritants, 129; of Vicia faba, 132-158; various experiments, 135-140; summary of results, 143-151; power of an irritant on, compared with geotropism, 151-154; sensitiveness of tip to moist air, 180; with greased tips, 185; effect of killing or injuring the primary radicle, 187-191; curvature of, 193; affected by moisture, 198; tip alone sensitive to geotropism, 540; protrusion and circumnutation in a germinating seed, 548; tip highly sensitive, 550; the tip acts like the brain of one of the lower animals, 573 --, secondary, sensitiveness of the tips in the bean, 154; become vertically geotropic, 186-191

Ramey on the movements of the cotyledons of Mimosa pudica, and Clianthus Dampieri at night, 297

Ranunculus Ficaria, mode of breaking through the ground, 86, 90 --, single cotyledon, 96 --, effect of lateral light, 484

Raphanus sativa, sensitiveness of apex of radicle, 171 --, sleep of cotyledons, 301

Rattan, Mr., on the germination of the seeds of Megarrhiza Californica, 82

Relation between circumnutation and heliotropism, 435

Reseda odorata, hypocotyl of seedling slightly heliotropic, 454

Reversion, due to mutilation, 190 Rhipsalis cassytha, rudimentary cotyledons, 97

Ricinus Borboniensis, circumnutation of arched hypocotyl, 53

Robinia, effect of bright sunshine on its leaves, 445 -- pseudo-acacia, leaflets vertical at night, 355

Rodier, M., on the movements of Ceratophyllum demersum, 211

Royer, Ch., on the sleep-movements of plants, 281, n.; on the sleep of leaves, 318; the leaves of Medicago maculata, 345; on Wistaria Sinensis, 354

Rubus idaeus (hybrid) circumnutation of stem, 205 --, apogeotropic movement of stem, 498

Ruiz and Pavon, on Porlieria hygrometrica, 336

S.

SACHS on "revolving nutation," 1; intimate connection between turgescence and growth, 2, n.; cotyledon of the onion, 59; adaptation of root-hairs, 69; the movement of the radicle, 70, 72, 73; movement in the hypocotyls of the bean, etc., 91; sensitiveness of radicles, 131, 145, 198; sensitiveness of the primary radicle in the bean, 155; in the common pea, 156; effect of moist air, 180; of killing or injuring the primary radicle, 186, 187; circumnutation of flower-stems, 225; epinasty, 268; movements of leaflets of Trifolium incarnatum, 350; action of light in modifying the periodic movements of leaves, 418; on geotropism and heliotropism, 436, n.; on Tropaeolum majus, 453; [page 589]

SARRACENIA--STAPELIA

on the hypocotyls slightly heliotropic, and stems strongly apheliotropic of the ivy, 453; heliotropism of radicles, 482; experiments on tips of radicles of bean, 523, 524; curvature of the hypocotyl, 555; resemblance between plants and animals, 571

Sarracenia purpurea, circumnutation of young pitcher, 227

Saxifraga sarmentosa, circumn utation of an inclined stolon, 218

Schrankia aculeata, nyctitropic movement of the pinnae, 381, 403 -- uncinata, nyctitropic movements of leaflets, 381

Securigera coronilla, nocturnal movements of leaflets, 352

Seed-capsules, burying of, 513

Seed-coats, rupture of, 102-106

Seedling plants, circumnutating movements of, 10 Selaginella, circumnutation of 258 -- Kraussii (?), circumnutation of young plant, 66

Sida napoea, depression of leaves at night, 322 --, no pulvinus, 322 -- retusa, vertical rising of leaves, 322 -- rhombifolia, sleep of cotyledons, 308 --, sleep of leaves, 314 --, vertical rising of leaves, 322 --, no pulvinus, 322 --, circumnutation and nyctitropic movements of leaf of young plant, 322 --, nyctitropic movement of leaves, 397

Siegesbeckia orientalis, sleep of leaves, 319, 384

Sinapis alba, hypocotyl bending towards the light, 461 --, transmitted effect of light on radicles, 482, 483, 567 --, growth of radicles in darkness, 486

Sinapis nigra, sleep of cotyledons, 301

Smilax aspera, tendrils apheliotropic, 451

Smithia Pfundii, non-sensitive cotyledons, 127 --, hyponastic movement of the curved summit of the stem, 274-276 --, cotyledons not sleeping at night, 308 --, vertical movement of leaves, 356 -- sensitiva, sensitiveness of cotyledons to contact, 126 --, sleep of cotyledons, 308

Sophora chrysophylla, leaflets rise at night, 368

Solanum dulcamara, circumnutating stems, 266 -- lycopersicum, movement of hypocotyl, 50 --, of cotyledons, 50 --, effect of darkness, 124 --, rising of cotyledons at night, 306 --, heliotropic movements of hypocotyl, 421 --, effect of an intermittent light, 457 --, rapid heliotropism, 461 -- palinacanthum, circumnutation of arched hypocotyl, 51, 100 --, of cotyledon, 51 --, ellipses described by hypocotyl when erect, 107 --, nocturnal movement of cotyledons, 306

Sparganium ramosum, rhizomes of, 189

Sphaerophysa salsola, rising of leaflets, 355

Spirogyra princeps, movements of, 259, n.

Charles Darwin

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