in Thoreau’s Journal:

P. M. — To Pine Hill across Walden.

The high wind takes off the oak leaves. I see them scrambling up the slopes of the Deep Cut, hurry-scurry over the slippery snow-crust, like a flock of squirrels. The ice on Walden is of a dull white as I look directly down on it, but not half a dozen rods distant on every side it is a light-blue color.