448 



IRRIGATION PRACTICE 



FIG. 170. Shadof of Egypt or paecottah of India. 



Likewise, in Mexico and the southwestern United 

 States are remains of prehistoric canals, which prove 

 amply the high antiquity of irrigation in North America. 

 To the past belongs the credit of having originated irri- 

 gation; our present day must refine it and make it im- 

 perishable. 



