A clear, cold day.
P. M. - To Walden to examine the ice.
I think it is only such a day as this, when the fields on all sides are well clad with snow, over which the sun shines brightly, that you observe the blue shadows on the snow. I see a little of it to-day.
December 29th there were eight or ten acres of Walden still open. That evening it began to snow and snowed all night, and the remainder of the pond was frozen on that [and] the succeeding night. But on January 1st I was surprised to find all the visible ice snow ice, when I expected that only the eight or ten acres would be; but it appeared that the weight of the snow had sunk the ice already formed and then partly dissolved in the water, which rose above it and partly was frozen with it. The whole ice January 1st was about six inches thick, and I should have supposed that over the greater part of the pond there would be a clear ice about two inches thick on the lower side, yet where I cut through near the shore, I distinguished two kinds of ice, the upper two and a half inches thick and evidently snow ice, the lower about four inches thick and clearer, yet not remarkably clear.