CONTENTS 



INTRODUCTION 



CHAPTER 



I. Floristic and Oecological Plant-geography 



II. Growth-forms 



III. Plant-communities 



IV. Plan of this Book 



page 



I 



2 



12 



14 



SECTION I 



OECOLOGICAL FACTORS AND THEIR ACTION 



V. Light . 



VL Heat 



VII. Atmospheric Humidity and Precipitations 



Vni. Movements of the Air 



IX. Nature of the Nutrient Substratum 



X. Structure of the Soil 



XI. Air in the Soil 



XII. Water in the Soil 



XIIL Temperature of Soil 



XIV. Depth of the Soil. The Upper Layers of the Soil 



AND THE Subsoil 



XV. Nutriment in Soil 



XVL Kinds of Soil 



XVIL Are the Chemical or the Physical Characters of 



Soil the more important? .... 



XVIII. The Effect of a Non-living Covering over Vege 



tation 



XIX. Effect of a Living Vegetable Covering on Soil . 



XX. The Activity of Animals and Plants in Soil 



XXL Exposure. Orographic and other Factors 



16 



22 

 28 



36 

 40 

 40 



43 

 44 

 50 



54 

 55 

 59 



65 



72 

 75 



n 

 80 



