ILLUSTRATIONS, 



PAGB. 



Portrait of Author Frontispiece. 



" A river went out of Eden to water the garden " . . xvi 



Irrigation 5,000 Years Ago 3 



Irrigation Scene on the River Nile 5 



Grecian Tympanum Wheel 8 



Dividing Line Between Desert and Orchard ... 17 



Capillary Tubes of Soil 31 



The Newsom System of Water-supply .... 55 



The Jackson Level 59 



Target 60 



Drop and Reduction Box 67 



Curve of a Large Canal 69 



Canal on a Hillside , . 71 



Headgate of a Canal 73 



Top Sectional View of Land's Sand Gate ... 74 



Side View of Sand Gate . . . . c . . 74 



Front View of Sand Gate .74 



Automatic Waste Gate 76 



Iron Outlet Gate 78 



Bear Valley Dam 91 



Sweetwater Dam . . ". 93 



Diverting Dam 97 



Cross-section of Hydraulic Reservoir .... 104 



Riveted Iron Pipe 112 



Spiral Iron Pipe » . 113 



XI 



