ACKNOWLEDGMENTS 



The author desires to acknowledge his indebted- 

 ness to the respective authors of the excellent books, 

 "Arid Agriculture" and "Dry Farming," which were 

 freely consulted in its preparation, also to the respective 

 authors of various bulletins issued by Agricultural Ex- 

 periment Stations located in the dry land area, and by 

 the U. S. Department of Agriculture. 



