CONTENTS XV 



ons and bitterns Snipe Sadness of bird-life The for- 

 saken shores Solitude Beauty of the river Its maj- 

 esty The delta Disintegration The river in flood 

 The " bore" Meeting of river and sea The blue tomb 

 Shores of Gulf 63 



CHAPTER V. Light, Air, and Color. Popular ideas 

 Sunlight on desert Glare and heat Pure sunlight 

 Atmospheric envelope Vapor particles in air Clear air 

 Dust particles Hazes Seeing the desert air Sea- 

 breezes on desert Colored air Different hues Pro- 

 ducing color Refracted rays Cold colors, how produced 

 Warm colors Sky colors Color produced by dust 

 Effect of heat Effect of winds Sand-storms Reflec- 

 tions upon sky Blue, yellow, and pink hazes The dust- 

 veil Summer coloring Local hues Greens of desert 

 plants Color of the sands Sands in mirage Color of 

 mountain walls Weather staining Influence of the air 

 Peak of Baboquivari Buttes and spires Sun-shafts 

 through canyons Complementary hues in shadow Col- 

 ored shadows Blue shadows upon salt-beds How light 

 makes color Desert sunsets 77 



CHAPTER VI. Desert Sky and Clouds. Common- 

 place things of Nature The blue sky Changes in the 

 blue Dawns on the desert Blue as a color Sky from 

 mountain heights Blackness of space Bright sky-col- 

 ors Horizon skies Spectrum colors Bands of yellow 

 The orange sky Desert-clouds Rainfall Effect of 

 the nimbus Cumuli Heap-clouds at sunset Strati 

 Cirri Ice clouds Fire-clouds The celestial tapestry 

 The desert moon Rings and rainbows Moonlight 

 Stars The midnight sky Alone in the desert The mys- 

 teries Space and immensity The silences The cry of 

 the human , 95 



