CONTENTS 



CHAPTER I 



The Plant Cell 



PAGE 



The Protoplast. — ^Plasma Membrane or Ectoplasm. — General 

 Cytoplasm. — The Nucleus. — The Plastids. — Cell-divi- 

 sion. — Cell Differentiation. — Sizes of Cells. — The Cell- 

 wall. — The Chemical and Physical Nature and Physio- 

 logical Powers of the Protoplast. — Illustrative Studies . . 1-23 



CHAPTER II 



DiFFERENTLiTION OF THE TISSUES 



General Survey. — The Primordial Meristem. — The Pro- 

 toderm. — The Procambium. — The Ground Meristem. — 

 The Primary Permanent Tissues. — Illustrative Studies. 24-45 



CHAPTER III 



Secondary Increase in Thickness 



Dicotyledons and Gymnosperms. — Growth of the Vascular 

 Bundles. — Increase in the Cortex. — Monocotyledons. — 

 Unusual Growth in Thickness. — Illustrative Studies . . 46-60 



CHAPTER IV 



Protection prom Injuries and Loss of Water 



The Epidermis. — The Epidermis as a Protective Tissue. — 

 The Epidermis as a Waterproof Covering. — The Radial 



xi 



