EUPHORBIA—­GYMNOSPERMS

Euphorbia jacquineaeflora, nyctitropic movement of leaves, 388

F.

Flahault, M., on the rupture of seed-coats, 102-104, 106

Flower-stems, circumnutation of, 223-226

Fragaria Rosacea, circumnutation of stolon, 214-218

Frank, Dr. A. B., the terms Heliotropism and Geotropism, first used by him, 5, n.; radicles acted on by geotropism, 70, n.; on the stolons of Fragaria, 215; periodic and nyctitropic movements of leaves, 284; on the root-leaves of plants kept in darkness, 443; on pulvini, 485; on natural selection in connection with geotropism, heliotropism, etc., 570 —­, on Transversal-Heliotropismus, 419

Fuchsia, circumnutation of stem, 205, 206

G.

Gazania ringens, circumnutation of stem, 208 Genera containing sleeping plants, 320, 321

Geotropism, 5; effect of, on the primary radicle, 196; the reverse of apogeotropism, 512:  effect on the tips of radicles, 543

Geranium cinereum, 304
—­ Endressii, 304
—­ Ibericum, nocturnal movement of cotyledons, 298
—­ Richardsoni, 304
—­ rotundifolium, nocturnal movement of cotyledon, 304, 312
—­ subcaulescens, 304

Germinating seed, history of a, 548

Githago segetum, circumnutation of hypocotyl, 21, 108 —­, burying of hypocotyl, 109 —­, seedlings feebly illuminated, 124, 128 —­, sleep of cotyledon, 302 —­, —­ leaves 321

Glaucium luteum, circumnutation of young leaves, 228

Gleditschia, sleep of leaves, 368

Glycine hispida, vertical sinking of leaflets, 366

Glycyrrhiza, leaflets depressed at night, 355

Godlewski, Emil, on the turgescence of the cells, 485

Gooseberry, effect of radiation, 284

Gossypium (var.  Nankin cotton), circumnutation of hypocotyl, 22 —­, movement of cotyledon, 22, 23 —­, sleep of leaves, 324 —­, arboreum (?), sleep of cotyledons, 303 —­, Braziliense, nocturnal movement of leaves, 324 —­, sleep of cotyledons, 303 —­ herbaceum, sensitiveness of apex of radicle, 168 —­, radicles cauterised transversely, 537 —­ maritimum, nocturnal movement of leaves, 324

Gravitation, movements excited by, 567

Gray, Asa, on Delphinium nudicaule, 80; on Megarrhiza Californica, 81; on the movements in the fruiting fronds of Aesplenium trichomanes, 257; on the Amphicarpoea monoica, 520; on the Ipomoea Jalappa, 557

Grease, effect of, on radicles and their tips, 182, 185

Gressner, Dr. H., on the cotyledons of Cyclamen Persicum, 46, 77; on hypocotyl of the same, 96

Gymnosperms, 389
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HABERLANDT—­IPOMOEA

H.

Haberlandt, Dr., on the protuberance on the hypocotyl of Allium, 59; the importance of the arch to seedling plants, 87; sub-aërial and subterranean cotyledons, 110, n.; the arched hypocotyl, 554