CONTENTS 



PAET I 



THE ENVIRONMENT AND ITS INFLUENCE UPON 

 VEGETATION 



CHAPTER PAGE 

 INTRODUCTION -THE ENVIRONMENT- -FUNDAMENTAL CON- 

 SIDERATIONS - - 3 

 I. CLIMATE - - 9 

 II. THE EFFECT OF CLIMATE UPON VEGETATION TYPES OF 



VEGETATION - -15 



III. THE INFLUENCE OF WATER ON PLANT-LIFE - 24 



IV. THE INFLUENCE OF WATER ON LAND- PLANTS XERO PHY TES 



XEROPHYTIC FACTORS AND CHARACTERS - - 32 



V. WATER-PLANTS - - 47 



VI. TROPOPHYTES - 57 



VII. LIGHT AND HEAT - - (55 



VIII. THE ATMOSPHERE - - 76 



IX. THE SOIL : ITS PHYSICAL AND CHEMICAL PROPERTIES - 80 



X. THE BIOLOGY OF THE SOIL - - - 91 



PAET IT 



THE LIFE OF THE INDIVIDUAL PLANTPLANT 

 BIOLOGY 



INTRODUCTION PLANT BIOLOGY - - 103 



XI. DIVISION OF TERRESTRIAL PLANTS ACCORDING TO THEIR 



LONGEVITY AND FREQUENCY OF SEEDING - - 107 



XII. CLASSIFICATION OF PLANTS ACCORDING TO THEIR MODE OF 



GROWTH - - - - 114 



XIII. CLASSIFICATION OF PLANTS ACCORDING TO THEIR MODE OF 



NUTRITION - - . - - 123 



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