Issue 14 and Volume 35.

IRRIGATION IN ARIZONA. Under the auspices of the United States government very important irrigation projects have been carried out. Under private enterprise, also, the area subjected to irrigation has been greatly extended. There still remain, of course, large areas that can be irrigated by the storage of the spring and summer waters, which is the plan being adopted in the Federal government works, and the climate and soil are such that the crops produced on these lands will make the expensive irrigation works profitable in the end. The industrial art of irrigation in the United States began in Arizona, and indications are found throughout the valleys of the Gila and Salt’rivers that large areas now barren and forbidding were once occupied by a numerous prehistoric race. The canals now in use in many places follow quite closely the lines of those ancient systems. These early ditches reveal engineering skill of…

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