CONTENTS xvil 
CHAPTER XXII 
THE PROPERTIES OF VEGETABLE PROTOPLASM 
PAGE 
Adaptability of plants to their surroundings—Contractility—Ciliary 
and ameboid movement—Locomotion—Movements of rotation 
and circulation—Turgor and its maintenance—Mobile condition of 
protoplaam—Rhythm and its manifestations—Irritability and its 
conditions—Tone—Phototonus—Thermotonus—Tonie influence 
of light—Etiolation—Influence of too brilliant illumination ; 
paraheliotropism, apostrophe and epistrophe—Photo-epinasty— 
Regulating action of light on growth—Conditions of health— 
Acclimatisation F Fi : . . a : . 352-374 
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—Effect 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 : . 375-405 
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— 
Anzsthetics—Comparison of nervous mechanisms of plants and 
animals . : c . - 406-419 
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 
