CONTENTS 



CHAPTER I 



THE GENERAL STRUCTURE OF PLANTS 



PAGE 



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 ; coanocytes ; 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 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 .... 17-40 



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, Strasburger, and 

 Wiesner Differentiation of the substance of thickened cell- walls ; 



