January 27, 1854(From This Date, From Henry Thoreau's Journal, an excellent Thoreau blog.)
Cut this afternoon a cake of ice out of Walden and brought it home in a pail, another from the river, and got a third, a piece of last year’s ice from Sam Barrett’s Pond, at Brown’s ice-house, and placed them side by side. These lumps are not large enough to show the color. Walden ice has a green tint close by, but is distinguished by its blueness at a distance. The river ice inclines to a more opaque white. Comparing the lumps, Walden ice was, you might say, more crystalline than the river, but both showed the effect of heat more than the Barrett ice of last year, the bubbles being very much elongated and advanced toward the honeycomb stage, while in the Barrett ice they were spherical and there were wide clear spaces. This looked as if it would keep best.