Author : F. J. Chittenden
Publisher : Forgotten Books
Page : 328 pages
File Size : 43,5 Mb
Release : 2017-12
Category : Gardening
ISBN : 0332307883
The Journal of the Royal Horticultural Society, Vol. 35 by F. J. Chittenden Pdf
Excerpt from The Journal of the Royal Horticultural Society, Vol. 35: Part I.; July, 1909 There are also numerous movements of protoplasm within cells, especially when the process of cell-division takes place. The well known streaming and rotation are continually going on and well seen in Chara; but these will not concern us now. Other movements of organs are also the result of forces within the cells, and not the direct consequence of external agencies some of these will be referred to; but it is especially the movements resulting from stimuli of the surrounding physical conditions of life which I propose to deal with. As soon as plants begin to grow, their organs are subjected to, and respond to, various external stimuli and the problem is to detect which is, or are - as there may be more than one - acting upon any organ at any one time. The chief influences are (1) light and (2) shade; t.e., really, varying degrees of light till perfect darkness may' occur. (3) Varying degrees of heat and cold. (4) Moisture in the air or soil. (5) Gravitation, always acting in a direction perpendicular to the earth's surface. (6) Contact with a resisting surface. (7) To the preceding may be added the internal influence of cellular growth, which produces external movements of growing shoots. Organs may be developed under these influences without movement; but if their positions be altered, they will move or turn towards the source of the influence. Both the tendency to respond to any of these influences may become a fixed and hereditary character, and take place when the original exciting influence is absent; and the structure itself caused by response may be, and usually is, hereditary as well; so that it may be formed completely or partially previous to the commencement of the action of the stimulus which had originally given rise to it. See Cryptogamic Botany, by Bennett and Murray, pp. 422 and 442. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
