ILLUSTRATIONS 



PLATES. 



Page. 



Plate I. Fig. 1. — General view of the San Juan County Arid Farm, Utah. 

 Fig. 2. — Field of wheat in shock on land adjacent to the San 



.Juan County Arid Farm 40] 



II. Fig. 1. — Field showing the type of summer fallow maintained in 

 every other series on the San Juan County Arid Farm. Fig. 

 2. — The interior of an alfalfa plat on the San Juan County 

 Arid Farm 40 



III. Fig. 1. — A poor crop of wheat on the Sevier County Arid Farm, 



Utah. Fig. 2. — A crop of wheat grown without irrigation in 



the Cache Valley, Utah 40 



IV. Fig. 1. — Harvesting wheat grown without irrigation, near Nephi, 



Utah. Fig. 2. — A hillside garden in a semiarid region, show- 

 ing one of the settling ditches used to catch and hold the 

 water which runs off the hill above 40 



TEXT riGURES. 



Fig. 1. Map showing the location of the Great Basin 10 



2. Sketch map of Utah, showing the irrigated areas according to the 



census of 1900 and the location of arid experiment farms 14 



3. Duigrams showing the average monthly precipitation at some rep- 



resentative points in the semiarid West 18 



4. Diagram showing the total annual precipitation at Logan, Utah, 



1893-1906 - 19 



5. Diagram showing the total annual precipitation at Tooele, Utah, 



1897-1906 20 



6. Diagram showing the total annual precipitation at Levan, Utah, 



1890-1906 21 



7. Diagram showing the total annual precipitation at Parowan, Utah, 



1891-1906 22 



8. Profile sketch showing the relative positions of Deseret, Fillmore, 



and Richfield, Utah 23 



6 

 103 



