CONTENTS 



PAET I 



THE ENVIRONMENT AND ITS INFLUENCE DPON 

 VEGETATION 



CHAPTER PAGE 

 INTRODrCTION — THE BNVIROITMBNT — ^FUNDAMEHTAL CON- 



SIDEBATIONS - 3 



I. CIJMATB - 9 



ir. THE EFFECT OF CLIMATE TJPON VEGETATIOM — TYPES OP 



VEGETATION - 15 



m. THE INFLUENCE OF 'WATEE ON PLANT-LIFE 24 



IV. THE INFLUENCE OF WATER ON LAND-PLANTS — ^XEEOPHYTES 



XKBOPHYTIC FACTORS AND CHARACTERS 32 



V. WATER-PLANTS - - - - 47 



VI. TROPOPHYTES - .... 57 



Vn. LIGHT AND HEAT - - . . - - 65 



Vin. THE ATMOSPHERE - 76 



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



X. THE BIOLOGY OF THE SOIL - 91 



PART II 



THE LIFE OF THE INDIVIDUAL PLANT— PLANT 

 BIOLOGY 



INTRODUCTION — PLANT BIOLOGY 103 



XT. DIVISION OF TERRESTRIAL PLANTS ACCORDING TO THEIE 



LONGEVITY AND FREQUENCY OP SEEDING 107 



Xn. CLASSIFICATION OP PLANTS ACCOEDING TO THEIE MODE OP 



GEOWTH - - - 114 



TTTT . CLASSIFICATION OP PLANTS ACCOEDING TO THEIR MODE OF 



NUTRITION - - ... 123 



