BROKEN AND SIIADED LIGIIT 
39 
their blackness. Gas-light will cast no such 
shadows, nor will the sun, nor will the arc- 
light itself when muffled by a white globe. 
Anything like thick atmosphere, a cloud, or a 
milk-white glass that will spread the light over 
great space will lighten and expand the shadows 
at once. Hence it is that on cold, clear days, 
when there is little dust or vapor in the air to 
diffuse light, the shadows are darker, sharper, 
and less noticeable in their coloring than at any 
other time, while the hot days, with their thick 
atmospheres, produce opposite results. 
In America the heated days of early autumn, 
so remarkable for their hazy envelope of air 
and bright coloring, produce odd changes in 
the illumination of almost everything in land- 
scape. The shadows become much frailer in 
body, more transparent in light, with very pro- 
nounced hues, especially in the tones of lilac 
and blue. During the three heated days of 
September, in 1895, I had the opportunity of 
studying color effects, in both light and shade, 
in the woods and fields near Princeton, New 
Jersey—one of the most brilliant spots in au- 
tumn I have ever known. The studies were 
interesting, but the material was so bewilder- 
ing in variety that I found great difficulty in 
Diffusion of 
light. 
Shadows in 
hot weather, 
