Strasburger, on the effect of light on spores of Haematococcus, 455, n.; the influence of light on the swarm-spores, 488.

Strawberry, stolons of the, circumnutate, but not affected by moderate light, 454

Strephium floribundum, circumnutation and nyctitropic movement of leaves, 391, 392

T.

Tamarindus Indica, nyctitropic movement of leaflets, 374

Transversal — heliotropismus (of Frank) or diaheliotropism, 438

Trapa natans, unequal cotyledons, 95, n.

Tecoma radicans, stems apheliotropic, 451

Tephrosia caribaea, 354

Terminology, 5

Thalia dealbata, sleep of leaves, 389
—­, lateral movement of leaves, 404

Trichosanthes anguina, action of the peg on the radicle, 104 —­, nocturnal movement of cotyledons, 304

Trifolium, position of terminal leaflets at night, 282 —­ globosum, with hairs protecting the seed-bearing flowers, 517 —­ glomeratum, movement of cotyledons, 309 —­ incarnatum, movement of cotyledons, 309 —­ Pannonicum, shape of first true leaf, 350, 415 Trifolium pratense, leaves exposed at night, 293 —­ repens, circumnutation of flower-stem, 225 —­, circumnutating and epinastic movements of flower-stem, 276-279 —­, nyctitropic movement of leaves, 349 —­, circumnutation and nyctitropic movements of terminal leaflets, 352, 353 —­, sleep movements, 349 —­ resupinatum, no pulvini to cotyledons, 118 —­, circumnutation of stem, 204 —­, effect of exposure at night, 295 —­, cotyledons not rising at night, 118, 309 —­, circumnutation and nyctitropic movements of terminal leaflets, 351, 352 —­ strictum, movements of cotyledons at night, 116, 118 —­, nocturnal and diurnal movements of cotyledons, 309-311, 313 —­, movement of the left-hand cotyledon, 316 —­ subterraneum, movement of flower-heads, 71 —­, of cotyledons at night, 116, 118, 309 —­, circumnutation of flower-stem, 224, 225 —­, circumnutation and nyctitropic movements of leaves, 350 —­, number of ellipses in 24 hours, 405 —­, burying its flower-heads, 513, 514 —­, downward movement of peduncle, 515 —­, circumnutating movement of peduncle, 516

Trigonella Cretica, sleep of leaves, 345

Triticum repens, underground shoots of, become apogeotropic, 189 [page 591]

TRITICUM—­WILSON

Triticum vulgare, sensitiveness of tips of radicle to moist air, 184

Tropaeolum majus (?), sensitiveness of apex of radicle to contact, 167 —­, circumnutation of stem, 204 —­, influence of illumination on nyctitropic movements, 338-340, 344 —­, heliotropic movement and circumnutation of epicotyl of a young seedling, 428, 429 —­, of an old internode towards a lateral light, 430 —­, stems of very young plants highly heliotropic, of old plants slightly apheliotropic, 453 —­, effect of lateral light, 484 —­ minus (?), circumnutation of buried and arched epicotyl, 27

U.