I 



CONTENTS. 



Page. 



Introduction 279 



What causes rainfall 280 



What becomes of the rainfall 280 



Do forests influence evaporation? 281 



Do forests influence transpiration? 283 



The influence of forests in regulating the run-off 283 



Comparison of run-off from forested and nonforested areas 285 



Do forests increase the run-off? 287 



Conclusion 288 



III 



