in Thoreau’s Journal:

This evening I am obliged to sit with my door & window open—in a thin coat—which I have not done for 3 weeks at least.

A warm night like this at this season produces its effect on the village— The boys are heard at play in the street now at 9 ‘o’clock—in greater force & with more noise than usual. My neighbor has got out his flute— There is more fog than usual—the moon is full.

The tops of the woods in the horizon seen above the fog look exactly like long low black clouds—the fog being the color of the sky.