CONTENTS. 



INTRODUCTION 



PART I. Physiological Starting Points for the Investi- 

 gation 



A. Influence of Incisions in the Bark on the 



Life of the Tree 



B. Applicability of the Facts enumerated to 



Rubber Trees . 



C. Influence of Incisions on the production of 



Latex in the Bark . 



D. Problems for my Experiments 



PART II. My Experiments 



A. Influence of Girdling on the distribution and 



circulation of Sap in the Stem of Hevea 



B. Influence of the Tapping Incisions on the 



distribution and circulation of Sap in the 

 Stem of Hevea . 



PART III. Inferences and fresh Problems resulting 

 from my Experiments 



PART IV. Comparisons between my Observations and 

 the Experiences of practical Planters 



PART V. Value of the various Tapping Methods in 

 vogue judged from the points of view 

 attained . 



PART VI. Suggestions for Rational Tapping Methods 



