372 



THE EFFAGEMENT OF NATURE BY MAN 



ing methods and a scientific system of irrigation into 

 those areas. 



The whole problem of the increase of the more civilised 

 races and the necessary accompanying increase of. food- 

 production depends for its solution on the speedy intro- 

 duction of irrigation methods into what are now the great 

 unproductive deserts of the world. 



. 



