300 Plant Life and Evolution 



been increased by a sum many times greater than 

 the total amount spent in maintaining these experi- 

 ment stations. As a result of this great work, by 

 proper selection of varieties and improved methods 

 of agriculture e.g., dry farming in the arid West 

 the area of land fitted for agriculture has been very 

 much extended within recent years, and land which 

 for ages has remained a barren waste, now is com- 

 pelled to yield its crops of grain and fruit as a 

 reward for the ingenuity and persistence of man. 



