CONTENTS 



CHAPTER I 

 INTRODUCTION 



PAGES 



Permanent high production - - The relation of physiology to pro- 

 duction Physiology and ecology Physiological processes 



Environment Crop ecology Literature of Plant Physi- 

 ology Physiology and other sciences References . 1-14 



CHAPTER II 

 THE PLANT CELL 



The cell a physiological unit Early use of the term "cell" Meri- 

 stem or embryonic cells Cytoplasm The nucleus Plas- 

 tids The cell- wall Cell-sap Cell-forms - - Parenchyma 

 Sclerenchyma Tracheae or vessels Sieve tubes -- Proto- 

 plasmic movement Protoplasmic irritability and response 

 Laboratory work References ..... 15-34 



CHAPTER III 



THE WATER-CONTENT OF PLANTS AND THE GENERAL RELATIONS 



OF ROOT SYSTEMS 



Hydrostatic rigidity The water-content of plants - - Variation 

 in water-content of organs The water-absorbing system - 

 The root habit of crops --The production of root-hairs - 

 Root-hairs and the water-content of the soil - - The root-cap 



Structure of the root-tip Soil particles Soil texture 



ix 



