The Power of Movement in Plants (Classic Reprint)

Darwin, Charles

ISBN 10 : 1440079986 ISBN 13 : 9781440079986

Editeur : Forgotten Books, 2016

A propos du livre

Présentation de l'éditeur :

INTRODuc'rIQN. THE chief object of the present work is to describe and connect together several large classos of move~ ment, common to almost all plants. The most widely prevalent movement is essentially of the same nature as that of the stem of a climbing plant, which bends ~uccessively to all points of the compass, so that the tip revolyes. This movement has been called by Sachs H l'evolving nutation;" but we have found it much more convenient to use the terms circumnutation and circum-nutate. As we shall have to say much about this movement, it will be useful here briefly to describe its nature. If we observe a circumnutating stem, which happens at the time to be bent, we will say towards the north, it will be found gradually to bend more and more easterly, until it faces the east; a.nd so onwards to the south, then to the west, and back again to the north. If the movement had been quite regular, the apex would have described a circle, or rather, as the st.em i

Table of Contents

J NTRODUCTION •• •• Page 1-9; CHAPTER I; TilE Cmc'UMNuTATING 1IoVEMENTS OF SEEDLING PLA~'TS; Brassica oleracea, ci rcumnu tn tiou of the radicle, of the arch ed hy pocotyl; whilst still buried beneath the ground, whih,t rising above; the ground and straigbtening itself, and when erect--Circumnutation; of the cotyledons-Rate of movement--Analogous observations; on various organs in species of Githago, GossYJllum,; Oxalis, 'l'ropreolum, Citrus, lEseulus, of severa) Legumin(lus and; Cueurbitaccous genera, Opuntia, I1cliantlnls, Priml1lll, Cyclamen,; Stapelia, Cetinthe, Nolana, Solanum, Beta, Riciuus~ Quercus,; Corylus,Plnlls, Oycas, Canna, Allium, AsparagtlS, Phalaris Zea,; Avena, Nephrodium, nnd ScI

Présentation de l'éditeur :

Excerpt from The Power of Movement in Plants

The chief object of the present work is to describe and connect together several large classes of movement, common to almost all plants. The most widely prevalent movement is essentially of the same nature as that of the stem of a climbing plant, which bends successively to all points of the compass, so that the tip revolves. This movement has been called by Sachs "revolving nutation;" but we have found it much more convenient to use the terms circumnutation and circumnutate. As we shall have to say much about this movement, it will be useful here briefly to describe its nature. If we observe a circumnutating stem, which happens at the time to be bent, we will say towards the north, it will be found gradually to bend more and more easterly, until it faces the east; and so onwards to the south, then to the west, and back again to the north. If the movement had been quite regular, the apex would have described a circle, or rather, as the stem is always growing upwards, a circular spiral. But it generally describes irregular elliptical or oval figures; for the apex, after pointing in any one direction, commonly moves back to the opposite side, not, however, returning along the same line.

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À propos de cette édition

• Éditeur: Forgotten Books
• Date d'édition: 2016
• ISBN 10: 1440079986
• ISBN 13: 9781440079986
• Reliure: Livre broché
• Nombre de pages: 606