CONTENTS 



ing water " Sun-bursts and flying shadows in Scotland 

 Moon-bursts and moon beams Shaded light The law 

 of shadows Electric-light shadows Shadows lightened 

 by light-diffusion Shadows in hot weather The colored 

 shadow Scientifically explained Complementary hues 

 in shadow Necessary conditions of the colored shadow- 

 Blue shadows on snow Lilac shadows on clay and sand 

 The mixed colors in nature Shadow complications 

 The shadowless day Odd colors in shadow Shadows of 

 the moon And of the stars 26 



CHAPTER HI. The Slue Sky. Impressions of the 

 sky Transparency of the blue Sky depth Through the 

 clouds Sky reach Sky lines seen at sea Horizon 

 lines Sky lines seen from heights Apparent changes 

 across the face of the sky Sky waves and undulations 

 The blue seen from mountain-tops The Great Silence 

 of the firmament The blue seen from the valleys Its 

 changes by day and by night The tenderness of its 

 coloring Our non-observance of the sky And of sky 

 tints Alpine glows at home Skies in different lands 

 Color changes through atmosphere Season changes in 

 the blue Luminosity of the blue Transmitted and 

 reflected light Sky lights on the earth Reflection from 

 the blue Atmospheric reflection The dawn an illustra- 

 tion of atmospheric reflection And also a symbol in 

 natural religion 47 



CHAPTER IV. Clouds and Cloud Forms. Cloud- 

 making Cloud forms Why clouds float Effect of the 

 winds Effect of the air-currents Cloud caps Banner 

 clouds Self-renewal of clouds Clouds, how acted upon 

 How moved Day and night cloud* Classification of 

 the families The cirrus Whiteness of the cirrus Color 



