CONTENTS XV 
PAGE 
CHAPTER XXII 
THE PROPERTIES OF VEGETABLE PROTOPLASM 
Adaptability of plants to their surroundings—Contractility—Ciliary 
and ameboid movement—Locomotion—-Movements of rotation 
and cireulation—Turgor and its maintenance—Mobile condition of 
protoplasm—Rhythm and its manifestations—Irritability and its 
conditions—Tone—Phototonus--Thermotonus --Tonic influence of 
light—Etiolation—Influence of too brilliant illumination; para- 
heliotropism, apostrophe and epistrophe—Photo-epinasty—Regu- 
lating action of light on growth—Conditions of health—Acclima- 
tisation : : , , 3 344-366 
CHAPTER XXIII 
STIMULATION AND ITS RESULTS 
Response of an organism to changes in its surroundings—Nature of 
stimulation—Purposeful character of the response —Stimulation of 
light -Nyctitropic movements, their conditions and purpose— 
Mechanism of the movements—Hffect of incidence of lateral light 
—Heliotropism— Stimulus of gravitation ; geotropism—The Klino- 
stat—Knight’s wheel—Stimulus of contact—Behaviour of various 
organs in relation to this form of stimulation—The root--Twining 
stems and tendrils —Hydrotropism— Chemical stimuli— Chemotaxis 
—Induced rhythm . ; : . ; : . 367-396 
CHAPTER XXIV 
THE NERVOUS MECHANISM OF PLANTS 
The purposeful responses of plants to stimulation; relation of stimulus 
to effect—Nature of nervous mechanisms—Sense organs and their 
differentiation—Motor mechanisms of plants—Contraction— 
Regulation of supply of water to the cell—Glandular organs—Con- 
duction of impulses; continuity of protoplasm—Co-ordination of ~ 
impulses—Latent period of stimulation—After-effects—Fatigue— 
Anesthetics—Comparison of nervous mechanisms of plants and 
animals . g ‘ ‘ é s ‘“ - Pe . 3897-410 
CHAPTER XXV 
REPRODUCTION 
Distinction between the individual protoplast and the colony or plant 
—Process of ;multiplication of protoplasts; gemmation, karyo- 
kinesis, formation of cell-walls ; free-cell formation— Vegetative 
