202 



FORESTRY AND IRRIGATION 



April 



for pumping is the wind. Oft the sweeping up the loose soil. In many 

 broad valleys and plains of the arid localities there are at depths of 20 or 

 regions the wind movement is almost 50 feet or more beneath the surface. 





Pumping Water by Horse Power 



continuous for days and weeks, carry- pervious beds of sand or gravel filled 

 ing away the dry leaves, even at times with waters by the infiltration or rain- 



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Pumping Water with a Threshing Engine 



