CONTENTS
CHAPTER I
THE PROBLEM OF THE ASCENT OF SAP
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Physical and physiological theories—Inconclusive character of Strasburger's poisoning and scalding experiments—Root-pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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CHAPTER II
AUTONOMOUS PULSATION
Rhythmic vegetable tissue—Autonomous pulsation in Desmodium gyrans—Multiple response under strong stimulus—Pulsations in growth—Characteristics of pulsatory activity—Effect of variation of internal hydrostatic pressure—Effect of maximal stimulus—Effect of sub-minimal stimulus—Modification of response in sub-tonic specimens—Effect of variation of temperature on rhythmic activity—Arrest of pulsation at the critical thermometric minimum—Effect of anæsthetics—Effect of dose—Action of poison—Tests for pulsatory activity—Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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CHAPTER III
DIRECTION AND RECORD OF THE ASCENT OF SAP
Detection and record of ascent of sap—Mechanical method of Erectile Response—The Automatic Recorder for erectile response—Erectile response of Mimosa, Chrysanthemum, and Impatiens—The Osmotic Theory—Theory of suction and root-pressure—Ascent of sap in the absence of root-pressure and transpiration—Depressed rate of ascent under increasing drought—Ascent of sap in cut stems previously exposed to air—Function of the xylem—Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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