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.

Stahl, Dr., on the effect of Aecidium on shoot, 189; on the influence of light on swarm-spores, 488, n.

Stapelia sarpedon, circumnutation of hypocotyl, 46, 47
[page 590]

STAPELIA—­TRITICUM

Stapelia sarpedon, minute cotyledons, 97

Stellaria media, nocturnal movement of leaves, 297

Stems, circumnutation of, 201-214

Stolons, or Runners, circumnutation of, 214-222, 558