MOUNTAINS AND IIILLS 
227 
effects of equal splendor when the mountains 
are lying to the east and are taking color from 
the last rays of the sun. They are far more brill- 
iant in hue than the western mountains, struck 
by the light of early morning. The warmth of 
color is greater, because the sunlight in the 
morning passes through cool and clarified air, 
and at evening the same sunlight throws its 
light eastward through a heated and dust-laden 
air. The difference in atmosphere makes the 
difference in color and light, and these in turn 
make a decided change in the east-lying moun- 
tains at sunset. Indeed, form as shown in the 
outline and the shadowy silhouette is not now 
conspicuous. Lines are dissipated and surfaces 
are flattened into tints. The range may be 
shadowed at its base—a deep, hazy shadow 
—while the tops may be in full sunlight and 
receive the glow of the western sky on every 
bush and tree and crag with startling effect. 
The total result of reflected light from the range 
may be copper-color, pale yellow, rosy-red, or 
silver-gray ; and upon such a feature asa tall 
spur or bare peak the color may change from yel- 
low to pink, from pink to gray, from gray to 
purple, until the light goes out of the west and 
the spur darkens and looms against the eastern 
Looking 
eastward at 
sunset. 
Mountain- 
glow at 
sunset, 
