ILLUSTRATIONS 



Sahuaro Frontispiece 



FACING 

 PAOK 



A desert valley 6 



Yucca of desert mountains 20 



Split Mountain Canyon Lower Colorado 32 



A desert floor 36 



Effect of wind on desert vegetation 42 



Old sea beach on Colorado Desert 46 



Water-line of ancient sea on mountain face 52 



Colorado River at Needles 64 



Colorado River above Yuma 72 



Colorado River near Pilot Knob 74 



Sunshine and cloud on the desert 78 



Mud Hills region 82 



Sand-dunes near Yuma 86 



Dawn on desert 96 



Cirrus, cumulus, and nimbus over desert mountains. . . 102 



Full sunlight ocatilla and greasewood 106 



Sand-dunes Colorado Desert 110 



Desert canyon 116 



Greasewood and creosote bush 130 



Desert palms 134 



A young family of bisnaga 142 



Water-hole desert mountains 152 



Cholla food for desert deer 154 



Desert sidewinder 168 



Woodpecker's nest in sahuaro 176 



xxi 



