CONTENTS 



CHAPTER I 



PAGE 



THE NATURE OF TRANSPIRATION 1 



CHAPTER II 



ASCENT OF SAP IN STEMS. CRITICISM OF PHYSICAL THEORIES . . 27 



CHAPTER III 



ASCENT OF SAP IN STEMS. CRITICISM OF VITAL THEORIES ... 47 



CHAPTER IV 



COHESION THEORY OF THE ASCENT OF SAP IN STEMS .... 81 



CHAPTER V 



TENSILE STRENGTH OF THE SAP OF TREES 101 



CHAPTER VI 



ESTIMATE OF THE TENSION REQUIRED TO RAISE THE SAP . . . .116 



CHAPTER VII 



OSMOTIC PRESSURES OF LEAF-CELLS 139 



CHAPTER VIII 



THE THERMO-ELECTRIC METHOD OF CRYOSCOPY . ... 155 



vii 



