in Thoreau’s Journal:
The slight robin snow of yesterday is already mostly dissipated, but where a heap still lingers the sun on the warm face of this cliff leads down a puny, tickling rill, moistening the gutters on the steep face of the rocks…You can trace the course of this trickling stream over the rock through such a patch of lichens by the olive green of the lichens alone. Here and there the same moisture refreshes and brightens up the scarlet crown of some little cockscomb lichen,
and when the rill reaches the perpendicular face of the cliff, its constant drip at night builds great organ pipes, of a ringed structure, which run together buttressing the rock.
Skating yesterday and to-day.