CONTENTS 



CHAPTEE 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 ; 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 ;. . . . \ . > ;-.-.-- . 1-16 



CHAPTEE 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 



CHAPTEE 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 ; 



