CONTENTS 



PAGK 



Introduction ------..._ i 



CHAPTER I. 

 THE CELLS AND TISSUES OF PLANTS. 



I. The Cell 14 



A. The Nature and Significance of Cellular Structure - - 14 



B. The Structure and Functions of the Typical Vegetable Cell - 18 



1. General Characteristics of Protoplasm - - - - 18 



2. The Protoplasmic or Plasmatic Membranes 24 



3. The Nucleus 26 



4. Chromatophores -------- 36 



5. Cell-sap .... .... 41 



6. The Cell-wall 43 



C. The Dimensions of Cells ------- 50 



D. Origin and Advantage of Cellular Structure 52 



II. Tissues 56 



A. Mode of Origin of Tissues - 56 



B. The Physiological Functions of Tissues - - - - 63 



C. The Anatomico -Physiological Classification of Tissues - - 69 



CHAPTER II. 



MERISTEMATIC TISSUES. 



I. General Considerations ------- 73 



II. The Primordial Meristem ------- 78 



A. Marginal and Apical Cells 78 



B. Growth by means of a Single Apical Cell - - 80 



C. Growth by means of Several Apical Cells - - - 83 



