Thoreau writes in his journal:
P.M.—To Fair Haven Pond and return via Andromeda Ponds and railroad . . .
As usual, I now see, walking on the river and river meadow ice, thus thinly covered with the fresh snow, that conical rainbow, or parabola of rainbow-colored reflections, from the myriad reflecting crystals of the snow, i.e., as I walk toward the sun . . .