The Power of Movement in Plants
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The Power of Movement in Plants

By Francis Darwin, Sir
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Book Description

The Power of Movement in Plants is a book by Charles Darwin on phototropism and other types of movement in plants. This book continues his work in producing evidence for his theory of natural selection. As it was one of his last books, followed only by the publication of The Formation of Vegetable Mould through the Action of Worms, he was assisted by his son Francis in conducting the necessary experiments and preparing the manuscript. The Power of Movement in Plants was published 6 November 1880, and 1500 copies were quickly sold by publisher John Murray.
This book stands at the culmination of a long line of study in plants and is immediately preceded by 'The different forms of flowers on Plants of the same species’ (1877). (See Bibliography for additional publications on plants.) These studies on plants were first evidenced in 'On the various contrivances by which British and foreign orchids are fertilised by insects’ (1862), the publication that immediately followed On the Origin of Species By Means of Natural Selection.
He co-authored this study with his son Francis Darwin (who specialised in botany) and his devotee, George Romanes, who assisted in editing the work. The work was begun in earnest late in 1877, after his work on climbing plants (1875) and insectivorous plants (1875) stimulated his interest in the subject. At times, Darwin despaired of ever finishing the work, as the book outgrew his original expectations:
"I have written a rather big book—more is the pity—on the movements of plants, and I am now just beginning to go over the MS. for the second time, which is a horrid bore."
As the book neared completion, he summarised its underlying viewpoint:
"My MS. relates to the movements of plants, and I think that I have succeeded in showing that all the more important great classes of movements are due to the modification of a kind of movement common to all parts of all plants from their earliest youth."
The work concerns itself with how plants respond to external stimuli and examines these processes in individual plants to gain understanding of some general principles governing their growth and life. This continues Darwin’s work of elucidating how natural selection works and specifically how plants have adapted to differing environments whilst at the same time answering some objections of his day that evolution could not account for changes in behavioural responses. In his conclusions, Darwin presents the key features of plants from an evolutionary perspective indicating that gradual modification of these processes in response to natural selective forces like light and water could enable extensive ability to adapt.
The process that creates the circular or elliptical movement of the stem and tips of plants (circumnutation) was identified as a significant one in enabling plants to evolve and adapt to almost any environment on the planet. Darwin also drew attention to the similarities between animals and plants, e.g., sensitivity to touch (thigmotropism), light sensitivity (phototropism), and gravity (geotropism). Darwin used various methods of enquiry: usually setting up rigorous controlled experiments which are clearly explained in the text, reporting the results and then drawing general conclusions. Studies of nyctinasty were particularly burdensome, to Darwin's rest as well as to the plants:
"I think we have proved that the sleep of plants is to lessen the injury to the leaves from radiation. This has interested me much, and has cost us great labour, as it has been a problem since the time of Linnaeus. But we have killed or badly injured a multitude of plants."
From Wikipedia (CC BY-SA).

Table of Contents
  • THE
    • ASSISTED BY
      • CONTENTS.
        • CHAPTER II.
        • CHAPTER III.
        • CHAPTER IV.
        • CHAPTER V.
        • CHAPTER VI.
        • CHAPTER VII.
        • CHAPTER VIII.
        • CHAPTER IX.
        • CHAPTER X.
        • CHAPTER XI.
        • CHAPTER XII.
        • INDEX…574-593
    • THE MOVEMENTS OF PLANTS.
      • INTRODUCTION.
      • CHAPTER I.
      • CHAPTER II.
  • CHAPTER III.
    • CHAPTER IV.
      • CHAPTER VI.
        • CHAPTER VII.
        • CHAPTER VIII.
        • CHAPTER IX.
        • CHAPTER X.
        • CHAPTER XII.
        • INDEX.
  • THE END.
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