CONTENTS 
CHAPTER I 
THE GENERAL STRUCTURE OF PLANTS 
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Unicellular plants; zoogonidia, yeasts, bacteria ; multicellular plants ; 
the protoplast, its structure and arrangements; characters of 
protoplasm; nuclei and nucleoli; association of protoplasts in 
colonies; slime fungi; ccenocytes; arrangements in multicellular 
plants—Needs of protoplasm ; its relation to water; formation of 
vacuoles ; relation of water to the plant in general; the aeration of 
protoplasm—Connection of protoplasts with one another in the 
body of the plant x . : ‘ ‘ , : . 1-16 
CHAPTER II 
THE DIFFERENTIATION OF THE PLANT BODY 
Division of labour the clue to differentiation of structure—Formation 
of protective tissues: epidermis, cuticle, periderm, bark—System 
of conducting tissues; vascular bundles and their distribution— 
Strengthening tissues: collenchyma and sclerenchyma; the 
different arrangements of them which are met with—The stereome 
of the plant--The metabolic tissues—The arrangements for the 
aeration of the interior; stomata, lenticels . : ‘ . 17-35 
CHAPTER III 
THE SKELETON OF THE PLANT 
Necessity of a skeleton to support the protoplasts; varieties of the 
skeleton—Development of the skeleton as the plant grows—Charac- 
ters of the cell-wall; cellulose, its properties and reactions; pectose 
and related substances—Arrangement of the solid matter and 
the water of the cell-wall; hypotheses of Naegeli and Stras- 
burger—Difterentiation of the substance of thickened cell-walls ; 
