xii TABLE OF CONTENTS 



Page 

 9. THE FUTURE OF DRY FARMING 40 



(a) The outstanding material interest. 



(b) The crude methods of practise must vanish. 



(c) The evolution will come increasingly. 



CHAPTER III 

 THE DOMAIN FOR DRY FARMING 



1. THE INFLUENCES THAT BEAR UPON DRY FARMING 4H 



(a) The amount of the precipitation. 



(b) The time at which it falls. 



(c) The character of the evaporation. 



(d) The temperature normally present. 



(e) The characteristics of the' soil. 



2. ARID AND SEMI-ARID AMERICA 47 



(a) Why these areas are not easily denned. 



(b) The dry area included by states. 



(c) The tillable land within the dry area. 



3. DIVISIONS OF THE ARID AND SEMI-ARID COUNTRY 49 



(a) The Great Plains area. 

 . (b) The Inter-mountain region. 



(c) The Columbia river basin . 



(d) The Great Inland basin. 



(e) The Colorado and Rio Grande river basins. 



4. ANNUAL PRECIPITATION IN THE VARIOUS STATES : . . . 52 



(a) Precipitation in North Dakota. 



(b) Precipitation in South Dakota. 



(c) Precipitation in Nebraska. 



(d) Precipitation in Kansas. 



(e) Precipitation in Oklahoma. 



(f) Precipitation in Texas. 



(g) Precipitation in New Mexico, 

 (h) Precipitation in Colorado. 



(i) Precipitation in Wyoming. 



(j) Precipitation in Montana. 



(k) Precipitation in Idaho. 



(1) Precipitation in Utah. 



(m) Precipitation in Nevada. 



(n) Precipitation in Arizona. 



(o) Precipitation in California. 



(p) Precipitation in Oregon. 



(q) Precipitation in Washington. 



(r) Precipitation in Alberta and Saskatchewan. 



5. THE SEASONS OF THE PRECIPITATION 57 



(a) Where it falls mainly in the winter. 



(b) Where it falls mainly in the spring. 



(c) Where it falls mainly in the summer. 



