in Thoreau’s Journal:

How different to-day from yesterday! Yesterday was a cool, bright day, the earth just washed bare by the rain, and a strong northwest wind raised respectable billows on our vernal seas and imparted remarkable life and spirit to the scene. Today it is perfectly still and warm. Not a ripple disturbs the surface of these lakes, but every insect, every small black beetle struggling on it, is betrayed; but, seen through this air, though many might not notice the difference, the russet surface of the earth does not shine, is not bright. I see no shining russet islands with dry but flushing oak leaves. The air is comparatively dead when I attend to it, and it is as if there were the veil of a fine mist over all objects, dulling their edges. Yet this would be called a clear day. These aerial differences in the days are not commonly appreciated, though they affect our spirits.