The Power of Movement in Plants eBook

Francis Darwin
This eBook from the Gutenberg Project consists of approximately 570 pages of information about The Power of Movement in Plants.
of Phalaris, manner of bending—­Results of the exclusion of light from their tips—­Effects transmitted beneath the surface of the ground—­Lateral illumination of the tip determines the direction of the curvature of the base—­Cotyledons of Avena, curvature of basal part due to the illumination of upper part—­Similar results with the hypocotyls of Brassica and Beta—­Radicles of Sinapis apheliotropic, due to the sensitiveness of their tips—­Concluding remarks and summary of chapter—­ Means by which circumnutation has been converted into heliotropism or apheliotropism...Page 449-492

CHAPTER X.

Modified circumnutationMovements excited by gravitation.

Means of observation—­Apogeotropism—­Cytisus—­Verbena—­Beta—­Gradual conversion of the movement of circumnutation into apogeotropism in Rubus, Lilium, Phalaris, Avena, and Brassica—­Apogeotropism retarded by heliotropism—­Effected by the aid of joints or pulvini—­Movements of flower-peduncles of Oxalis—­General remarks on apogeotropism—­Geotropism—­ Movements of radicles—­Burying of seed-capsules—­Use of process—­Trifolium subterraneum—­Arac
his—­Amphicarpaea—­Diageotropism—­Conclusion...493-522

CHAPTER XI.

Localised sensitiveness to gravitation, and its transmitted effects.

General considerations—­Vicia faba, effects of amputating the tips of the radicles—­Regeneration of the tips—­Effects of a short exposure of the tips to geotropic action and their subsequent amputation—­Effects of amputating the tips obliquely—­Effects of cauterising the tips—­Effects of grease on the tips—­Pisum [page x.] sativum, tips of radicles cauterised transversely, and on their upper and lower sides—­Phaseolus, cauterisation and grease on the tips—­Gossypium—­ Cucurbita, tips cauterised transversely, and on their upper and lower sides—­Zea, tips cauterised—­Concluding remarks and summary of chapter—­ Advantages of the sensibility to geotropism being localised in the tips of the radicles...Page 523-545

CHAPTER XII.

SUMMARY AND CONCLUDING REMARKS.

Nature of the circumnutating movement—­History of a germinating seed—­The radicle first protrudes and circumnutates—­Its tip highly sensitive—­ Emergence of the hypocotyl or of the epicotyl from the ground under the form of an arch—­Its circumnutation and that of the cotyledons—­The seedling throws up a leaf-bearing stem—­The circumnutation of all the parts or organs—­Modified circumnutation—­Epinasty and hyponasty—­Movements of climbing plants—­Nyctitropic movements—­Movements excited by light and gravitation—­Localised sensitiveness—­Resemblance between the movements of plants and animals—­The tip of the radicle acts like a brain...546-573

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The Power of Movement in Plants from Project Gutenberg. Public domain.
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